JP5131082B2 - Construction method of hydraulic mortar (slurry) - Google Patents

Description

The present invention relates to a construction method of hydraulic mortar (slurry) used in civil engineering construction work and a structure filled and cured with hydraulic mortar (slurry).
Furthermore, the present invention relates to a construction method of hydraulic mortar (slurry) used for grouting work in the field of civil engineering and construction, and a structure filled and cured with hydraulic mortar (slurry).

  Patent Document 1 includes Portland cement for the purpose of providing a grout composition in which a grout composition and water are kneaded continuously or using a continuous kneader to obtain a slurry having stable fluidity. A grout composition containing a hydraulic inorganic binder, a fluidizing agent, and an expanding agent is disclosed. Further, a slurry obtained by continuously kneading using the grout composition and using a continuous kneader is used with a pump. The construction method of the grout slurry supplied continuously to the construction part is disclosed.

JP 2006-298862 A

  The present invention can be employed in large-scale grouting work in the civil engineering and construction field, has excellent flow characteristics in a short time, has good material separation resistance, and has low temperature dependence on flow characteristics. Mortar (slurry) can be produced efficiently and stably. Furthermore, a slurry pump is used to stably pump a long distance via a slurry hose, and hydraulic mortar (slurry) is supplied to the construction site in a narrow space. An object of the present invention is to provide a construction method of hydraulic mortar (slurry) that can be placed and constructed.

  The inventors of the present invention have found that a hydraulic composition containing an inorganic fine powder having a specific component and a hydraulic component has excellent flow characteristics when kneaded with water and is a good material. It has been found that the flow characteristics of the prepared hydraulic mortar (slurry) having separation resistance have little temperature dependence.

  Furthermore, the present inventors include an inorganic fine powder having a specific component, a hydraulic component and a fine aggregate, and a hydraulic composition having a specific particle size configuration is excellent in a short time when kneaded with water. It was found that the flow characteristics of the prepared hydraulic mortar (slurry) are small in temperature dependence, as well as excellent flow characteristics.

In addition, even when the slurry prepared by continuously kneading the hydraulic composition and water is continuously supplied to a construction site in a narrow part using a pump, it is stable without causing material separation. The present invention has been completed by finding that long-distance pumping is possible and that it has excellent filling properties during construction.

That is, the first aspect of the present invention is a kneading apparatus for continuously preparing a hydraulic mortar (slurry) by kneading a hydraulic composition containing a hydraulic component and an inorganic fine powder and water, and the hydraulic mortar. Hydraulic mortar (slurry) using hydraulic mortar (slurry) preparation and construction equipment equipped with a reservoir tank for containing (slurry) and a slurry pump for continuously feeding hydraulic mortar (slurry) in the reservoir tank ( a construction method of a slurry), the hydraulic mortar (slurry), a stirring shaft in the reservoir tank is disposed in a horizontal direction, the composite stirring vane disposed threadably spiral agitating plate and a paddle agitating plate to the stirring shaft It is a construction method of hydraulic mortar (slurry) characterized by being forced to stir and cure continuously for 1.5 minutes to 20 minutes with a stirrer having

In the second aspect of the present invention, a hydraulic mortar (slurry) is continuously prepared by kneading a hydraulic composition containing a hydraulic component and an inorganic fine powder, and the hydraulic composition and water. For hydraulic mortar (slurry) preparation and construction comprising a kneading device, a reservoir tank for storing the hydraulic mortar (slurry), and a slurry pump for continuously pumping the hydraulic mortar (slurry) in the reservoir tank a construction method of hydraulic mortar track (slurry), the hydraulic mortar (slurry), a stirring shaft in the reservoir tank is disposed in a horizontal direction, threadedly stirring shaft spirally agitation plates and paddle-type stirring Construction of hydraulic mortar (slurry) characterized by continuous forced stirring and curing for 1.5 to 20 minutes by a stirrer having a composite stirring blade arranged with a plate It is the law.

  The third aspect of the present invention is a structure in which a hydraulic mortar (slurry) obtained by the hydraulic mortar (slurry) construction method of the present invention is filled and cured.

The preferable aspect of the hydraulic composition used by this invention is shown below. In the present invention, these embodiments can be combined.
1) The inner diameter (diameter) of the cylinder inscribed by the composite stirring blade is 150 mm to 300 mm, and the length of the composite stirring blade in the stirring shaft direction is 300 mm to 1200 mm.
2) Hydraulic mortar (slurry) is a hydraulic mortar (slurry) construction method that is pumped and applied to a construction site through a slurry hose connected to a slurry pump, the inner diameter of the slurry hose (Diameter) is 20 mm to 55 mm, and the length is 75 m to 200 m.
3) hydraulic composition comprises a hydraulic component and inorganic fine powder, inorganic fine powder, the Blaine specific surface area of 4000cm ² / g~15000cm ² / g, average particle size below is 10.0 [mu] m, an average circularity of 0.915 to 1.000, and the inorganic fine powder in the total mass of 100% by mass of the hydraulic component and the inorganic fine powder is 25 to 45% by mass.
4) The hydraulic composition contains fine aggregate, and the hydraulic composition contains 20.5 to 30.0% by mass of particles of 1 μm or more to less than 8 μm, and 10.0 to less than 8 μm to less than 32 μm of particles. 25.0% by mass, particles of 32 μm or more and less than 300 μm are included 10.0 to 40.0% by mass, particles of 300 μm or more and less than 850 μm are contained 15.0 to 50.0% by mass, and particles of 850 μm or more are contained. Containing 0.0 to 2.0 mass%.
5) The hydraulic composition contains a fluidizing agent and a thickener.
6) The hydraulic composition further includes a fluidizing agent and a thickener, and the hydraulic mortar (slurry) obtained by kneading the hydraulic composition and water has a flow value X at normal temperature and a high temperature. The ratio of the flow value Y to the flow value Z at low temperature is 0.80 <Y / X <1.10 and 0.90 <Z / X <1.10.
7) The hydraulic composition is a grout material for civil engineering and construction.

The construction method of hydraulic mortar (slurry) according to the present invention can produce hydraulic mortar (slurry) continuously, supply and construct continuously to remote construction sites, and is excellent in construction efficiency and construction quality. It is effective in constructing structures with stable quality.

Furthermore, in the construction method of the hydraulic mortar (slurry) of the present invention, a hydraulic composition having a specific particle size configuration including an inorganic fine powder having a specific component, a hydraulic component and a fine aggregate is selected. As a result, it is possible to obtain a hydraulic mortar (slurry) having excellent flow characteristics in a short time when kneaded with water and having good material separation resistance and low temperature dependence of the flow characteristics. be able to. As a result, the flow properties and stable hydraulic mortar, such as long and short in regardless flow value and J ₁₄ funnel flow value of the kneading time (slurry) can be stably manufactured regardless of the season.

The hydraulic mortar (slurry) prepared using the hydraulic composition used in the present invention is excellent in material separation resistance even when the slurry is pumped over a long distance using a pump. The phenomenon can be greatly reduced. Moreover, since it has the outstanding fluidity | liquidity, it also becomes possible to fill the construction place of a narrow part. By using the hydraulic mortar (slurry) preparation / construction equipment as shown in the schematic diagram of FIG. 1, the water used in the present invention can be used on the site where hydraulic mortar (slurry) is continuously applied in large quantities on a large scale. By using a hard composition, it becomes possible to manufacture and supply a hydraulic mortar (slurry) that is efficient and stable.

In the present invention, a hydraulic composition capable of obtaining excellent flow characteristics in a short time when kneaded with water is selected and used, and the hydraulic composition as shown in the schematic diagram of FIG. 4 is stored. A hydraulic mortar (slurry) preparation / construction truck equipped with a tank is used, and a hydraulic composition and water are continuously kneaded using a continuous kneading mixer mounted on the truck. Slurry) is continuously prepared, and the slurry is forcibly stirred and cured, and then hydraulic mortar (slurry) is continuously pumped, supplied, and struck to the construction site via a slurry hose by a slurry pump mounted on the truck. By installing it, it became possible to construct a large amount of hydraulic mortar (slurry) within a limited period on a large-scale site.

Furthermore, the cured body of the hydraulic mortar (slurry) prepared using the hydraulic composition used in the present invention has a small dimensional change rate and adiabatic temperature rise, excellent crack resistance, and a highly durable structure. You can get a body.

The present invention uses a hydraulic composition comprising a hydraulic component and an inorganic fine powder as essential components, and kneading the hydraulic composition and water to continuously prepare a hydraulic mortar (slurry). Hydraulic mortar (slurry) comprising an apparatus, a reservoir tank for curing and stabilizing the hydraulic mortar (slurry) under forced stirring, and a slurry pump for continuously pumping the hydraulic mortar (slurry) in the reservoir tank ) A construction method of hydraulic mortar (slurry) using preparation / construction equipment and a structure filled and cured with hydraulic mortar (slurry) obtained by the construction method.

The construction method of the hydraulic mortar (slurry) of this invention is demonstrated.
In the construction method of hydraulic mortar (slurry) of the present invention, hydraulic mortar (slurry) preparation / construction equipment 11 as shown in the schematic diagram of FIG. 1 is used.

The hydraulic composition 12 is supplied from the hopper 13 of the hydraulic mortar (slurry) preparation / construction facility 11, and water 17 is supplied from the water supply port 15 of the kneading device (mixer) 16 in parallel with the hydraulic composition 12. The composition 12 and water 17 are continuously kneaded by a kneading device (mixer) 16 to produce a hydraulic mortar (slurry) 19.

Hydraulic mortar (slurry) 19 is temporarily accommodated in the reservoir tank 20 is installed in the tank were placed and strong vertical convection stirring ability Yusuke that screw spiral agitating plate and paddle type stirrer plate Forced stirring and curing are performed by a stirrer equipped with the composite stirring blade 22, and the flow characteristics of the slurry are stabilized.
The hydraulic mortar (slurry) 19 agitated and cured for a predetermined time is pumped by a slurry pump 24 mounted on the equipment, and continuously pumped and supplied to a construction site through a slurry hose connected to the slurry pump 24. Placed and constructed.

The reservoir tank in which the hydraulic mortar (slurry) is once stored serves as a curing tank that homogenizes the hydraulic mortar (slurry) and stabilizes its fluidity.
The amount of the hydraulic mortar (slurry) stored in the reservoir tank is preferably 30 to 200 liters, more preferably 35 to 150 liters, and particularly preferably 40 to 100 liters. It is preferable because it can be forcedly stirred and cured in the reservoir tank.

  If the storage amount of hydraulic mortar (slurry) is smaller than the above range, the slurry may be pumped without being fully cured, and the hose may be blocked when pumped over a long distance, If it exceeds 1, the forced agitation curing time in the reservoir tank becomes too long, and the viscosity of the slurry increases and the tendency to deteriorate the fluidity becomes unfavorable.

The hydraulic mortar (slurry) forcibly stirred and cured in the reservoir tank is continuously pumped and supplied to the construction site via a slurry hose connected to the slurry pump 24.
The discharge rate when pumping hydraulic mortar (slurry) is preferably 1.5 to 130 liters per minute, more preferably 4 to 100 liters per minute, and particularly preferably 7 to 80 liters per minute. It is preferable because a stable hydraulic mortar (slurry) can be supplied.

  If the discharge rate when pumping hydraulic mortar (slurry) is smaller than the above range, the flow rate of the slurry may be too small, and the slurry may cause material separation during the pumping process, and the construction time will be too long. It is not preferable because the construction period is delayed, and if it exceeds the above range, the pressure inside the hose becomes high and the possibility that the hose is blocked increases, and it is difficult to fill the construction site with hydraulic mortar (slurry). This is not preferable.

The slurry hose used when pumping hydraulic mortar (slurry) is not particularly limited, and is appropriately selected and used from a commercially available resin hose or pressure hose in consideration of conditions such as a pumping distance. be able to. When the pumping distance is long, it is preferable to use a pressure hose.
The inner diameter and length of the slurry hose are selected according to the construction conditions, preferably the inner diameter (diameter) of the slurry hose is 20 mm to 55 mm, and the length is 75 m to 200 m, more preferably the slurry hose. The inner diameter (diameter) of the slurry hose is 25 mm to 50 mm and the length is 80 m to 180 m, and particularly preferably, the inner diameter (diameter) of the slurry hose is 30 mm to 45 mm and the length is 90 m to 150 m. Preferably, when the inner diameter (diameter) and length of the slurry hose are within the above ranges, the long distance can be stably pumped.
When the inner diameter (diameter) of the slurry hose is smaller than the above range, it is not preferable because the pressure in the hose when the slurry is pumped becomes high and the possibility that the hose is blocked increases. Is too small, and the slurry may cause material separation in the pumping process, which is not preferable.
In addition, when the length of the slurry hose is shorter than the above range, slurry pumping may be possible without necessarily using a hydraulic composition having excellent material separation resistance selected and used in the present invention, and longer than the above range. This is not preferable because the pressure inside the hose becomes high and the possibility that the hose is blocked increases.

Then, the kneading screw provided in the hydraulic mortar (slurry) Preparation and construction equipment 11 shown in the schematic diagram of FIG. 1, and, for the composite stirring vane 22 disposed between screw spiral agitating plate and paddle type stirrer plate explain.

The kneading screw 10 of the kneading device 16 shown in FIG. 1 includes a shaft member whose length from the base end to the end is about the length of the kneading chamber of the kneading device, and a plurality of blades formed on the outer peripheral surface of the shaft member. And have. The plurality of blades include 20 to 30 return blades and 4 to 8 feed blades. The total number of return blades and feed blades is 24 to 38, and the ratio of the return blades to the entire blades is 71 to 88%.
In addition, the length from the base end to the terminal end of the shaft member of the kneading screw is about 800 to 1000 mm.

In the construction method of the hydraulic mortar (slurry) of the present invention, as a kneading screw of the kneading apparatus, a kneading screw having a plurality of feeding blades and a plurality of returning blades and capable of obtaining a very high kneading force is used. In addition, the hydraulic composition and water can be uniformly slurried with a strong kneading force during a short period of time passing through the mixing apparatus, and a hydraulic mortar (slurry) in a good kneaded state can be obtained quickly. Can do.
Table 8 shows an example of a kneading screw blade, a kneading chamber, and kneading conditions that provide suitable kneading characteristics with the hydraulic mortar (slurry) construction method of the present invention.

Hydraulic mortar obtained by kneading apparatus (slurry), forced by a composite stirring vane temporarily housed in a reservoir tank installed in the lower part, and arranging the screw spiral agitating plate and paddle agitating plate kneading apparatus Under the stirring state, the mixture is stirred and cured for a predetermined time.

Next, stabilization of slurry fluidity by curing treatment of hydraulic mortar (slurry) in the reservoir tank will be described.
Figure 3 is a schematic view of a composite stirring vane 22 disposed between the reservoir the installed threaded spiral agitating plate to the tank 20 and a paddle agitating plate shown in FIG.
Composite stirring vane is arranged stirring blade spirally around the stirring shaft, are arranged plate to the position of the axis symmetry is welded to further Tonaria' spiral stirring plates. Furthermore, the intermediate space between the helix stirrer plate and spiral agitating plate, a paddle type stirring plate having an inclination angle is provided on the stirring shaft so that the position of the axis symmetry.

The composite stirring vane disposed between said threaded spiral agitating plate and a paddle agitating plate in the present invention, deployed in a reservoir tank containing a hydraulic mortar (slurry), the hydraulic mortar in the tank (slurry) By continuously generating strong convection in the vertical and horizontal directions, particularly strong convection in the vertical direction, material separation of the mortar (slurry) can be avoided and initial water immediately after contact between the hydraulic component and water. By buffering and stabilizing the summed state and curing the hydraulic mortar (slurry) to a homogeneous state, the flow characteristics of the mortar (slurry) are stabilized.

Hydraulic mortar (slurry) is placed on the stirring shaft in the horizontal direction in the reservoir tank, the agitator having a composite stirring vane disposed threadably spiral agitating plate and a paddle agitating plate to the stirring shaft, preferably 1. Forcibly stirred for 5 minutes to 20 minutes, more preferably for 2 to 18 minutes, and particularly preferably for 2.5 to 15 minutes. Thus, the homogeneity of the slurry is enhanced, and a hydraulic mortar (slurry) having a stable and good fluidity can be obtained.
When the time for forced stirring and curing is shorter than the above range, the homogeneity of the slurry may not be sufficiently increased, and when it is longer than the above range, the hydration reaction of the hydraulic component tends to inhibit the fluidity of the slurry. Is not preferable because it starts to become noticeable.

Composite stirring vane disposed threadably spiral agitating plate and a paddle agitating plate to use in the present invention, the cylindrical inner diameter composite stirring blade is inscribed (diameter), preferably 150 mm to 300 mm, more preferably 170mm 280 mm, particularly preferably 180 mm to 250 mm, and the length of the composite stirring blade in the direction of the stirring axis is preferably 300 mm to 1200 mm, more preferably 350 mm to 1100 mm, particularly preferably 400 to 1000 mm. The hydraulic mortar (slurry) can be homogenized with stirring power.

  If the diameter and length of the composite agitating blade is larger than the above range, the reservoir tank itself that accommodates the agitating blade will be enlarged, so there will be many restrictions on the actual movement and installation of the device, which will impede practical use. If the diameter and length of the composite stirring blade is smaller than the above range, the size of the composite stirring blade relative to the volume of the reservoir tank becomes relatively small, and the hydraulic mortar (slurry) is removed. Since the effect of homogenizing by forced stirring may not be obtained sufficiently, it is not preferable.

In the construction method of hydraulic mortar (slurry) of the present invention, stable quality hydraulic mortar (slurry) is manufactured and supplied in large quantities continuously when a large amount of grout material is constructed at a large construction site. Therefore, it is preferable to use a hydraulic mortar (slurry) preparation / construction truck 31 as shown in the schematic diagram of FIG. 4 because high construction efficiency can be obtained.

A hydraulic mortar (slurry) preparation / construction truck 31 includes a tank 33 for storing a hydraulic composition 37, a mixer 35 for continuously kneading the hydraulic composition 37 and water, and a hydraulic mortar (slurry). ) And a slurry pump 44 that pumps hydraulic mortar (slurry) from the tank.

Next, the construction method of the hydraulic mortar (slurry) using the hydraulic mortar (slurry) preparation / construction truck 31 shown in FIG. 4 will be described.
In the manufacturing plant of hydraulic composition 37, hydraulic composition 37 is manufactured by mixing hydraulic components, raw materials such as fine aggregate having a specific particle size structure, a fluidizing agent, and an expanding material, and hydraulic mortar ( Slurry) The hydraulic composition storage tank 33 provided in the preparation / construction truck 31 is filled.
The hydraulic mortar (slurry) preparation / construction truck 31 loads the hydraulic composition 37 and transports the hydraulic composition 37 to the vicinity of the construction site where the hydraulic mortar (slurry) 34 is constructed.
After the hydraulic mortar (slurry) preparation / construction truck 31 is arranged in the vicinity of the construction site, the hydraulic composition 37 is discharged from the lower part of the storage tank 33 by the screw conveyor and supplied to the hopper 36 by the screw feeder 38. From the bottom of the hopper, it is supplied quantitatively to the kneading device (mixer) 35. At this time, as the hydraulic composition 37 is supplied to the kneading device (mixer) 35, the water supply pump 40 from the water tank 39 mounted on the truck 31 for preparing and constructing the hydraulic mortar (slurry). Water is quantitatively supplied to the kneading device (mixer) 35 through the water supply pipe 41, and the hydraulic composition 37 and water are strongly kneaded by the kneading device (mixer) 35 to form a homogeneous hydraulic mortar ( Slurry) 34 is prepared. The supply ratio of the hydraulic composition 37 and water is adjusted according to the construction conditions for each site and the properties of the hydraulic mortar (slurry).
Prepared hydraulic mortar (slurry) 34 is temporarily accommodated in a reservoir tank 43 which is provided on the track, which is installed in the reservoir tank 43, threaded spiral stirring that have a strong vertical convection stirring capacity Forced stirring and curing are performed by a stirrer equipped with a composite stirring blade 42 in which a plate and a paddle type stirring plate are arranged, and the flow characteristics of the slurry are stabilized.
The hydraulic mortar (slurry) 34 agitated and cured for a predetermined time is pumped by a slurry pump 44 mounted on the truck, and continuously pumped and supplied to a construction site via a slurry hose 45 to be placed and constructed. The

In the construction method of the hydraulic mortar (slurry) of the present invention, the continuously prepared hydraulic mortar (slurry) is continuously supplied to the construction site via the slurry pump 44 and the slurry hose 45. Slurry) is supplied and applied to form a structure filled and cured with hydraulic mortar (slurry).

In the construction method of the hydraulic mortar (slurry) of the present invention, when the location where the hydraulic mortar (slurry) is constructed is narrow or the filling port of the hydraulic mortar (slurry) is narrow, the slurry hose 45 It is preferable that a tapered tube is attached to the tip, and hydraulic mortar (slurry) is supplied and applied to a narrow filling location or filling port via the tapered tube.

The material of the taper tube that can be used in the present invention is not particularly limited, and a taper tube made of metal, resin, ceramic, or the like can be used, and is appropriately selected according to the conditions of the narrow construction site. Can be used.
The length, the inner diameter (diameter) of the tapered tube that can be used in the present invention, and the degree of squeezing of the tube can be appropriately selected and used according to the conditions of the narrow construction site, and the slurry of the tapered tube as shown in FIG. The inner diameter of the hose joint is preferably 18 mm to 55 mm, more preferably 20 mm to 50 mm, particularly preferably 22 mm to 45 mm, and the inner diameter of the tip of the tapered tube is preferably 5 mm to 30 mm, More preferably, it is 6 mm to 28 mm, and particularly preferably 7 mm to 26 mm, since hydraulic mortar (slurry) can be stably filled into a narrow construction site.

The length of the tapered tube that can be used in the present invention is preferably 200 mm to 1000 mm, more preferably 250 mm to 850 mm, and particularly preferably 300 mm to 700 mm, while ensuring good workability. Excellent filling properties can be obtained.
In addition, the connection method of a taper tube and a slurry hose is not specifically limited, It can connect using the adapter for a connection, and a taper tube and a slurry hose can also be connected directly.

Next, the hydraulic composition used in the present invention will be described.
The hydraulic composition containing the hydraulic component and the inorganic fine powder used in the construction method of the hydraulic mortar (slurry) of the present invention is not particularly limited, and is a hydraulic mortar having good material separation resistance. What can obtain (slurry) stably can be selected suitably, and can be used.
In particular, in the construction method of the hydraulic mortar (slurry) of the present invention, it is a hydraulic composition for grout used for civil engineering construction work, comprising a hydraulic component and an inorganic fine powder as essential components, Water capable of stably preparing a hydraulic mortar (slurry) that has excellent flow characteristics in a short time by the kneading operation and has good material separation resistance and low temperature dependence of the flow characteristics. A hard composition can be preferably used.

  The hydraulic composition that can be particularly suitably used in the method for applying the hydraulic mortar (slurry) of the present invention will be described below.

The hydraulic component of the hydraulic composition contains Portland cement, and can contain gypsum and alumina cement as needed as long as the properties of the present invention are not impaired.

  The components contained in the hydraulic component can be selected from only Portland cement, two types of Portland cement and gypsum, two types of Portland cement and alumina cement, and three types of Portland cement, alumina cement and gypsum.

  Examples of Portland cement include ordinary Portland cement, early-strength Portland cement, ultra-early strong Portland cement, moderately hot Portland cement, and the like, and one or a mixture of two or more can be used.

Preferably, Portland cement is contained in an amount of 10% by mass or more, more preferably 30% by mass or more, more preferably 70% by mass or more, and particularly preferably 90% by mass or more based on 100% by mass of the hydraulic component.

  As the gypsum, gypsum such as anhydrous gypsum, hemihydrate gypsum, and dihydrate gypsum can be used as one kind or a mixture of two or more kinds regardless of the kind.

  Several types of alumina cement having different mineral compositions are known and commercially available, but the main component is monocalcium aluminate (CA), and commercially available products can be used regardless of the type.

  In the hydraulic composition used in the present invention, a hydraulic mortar having excellent flow characteristics in a short time by kneading with water, good material separation resistance, and low temperature dependence of flow characteristics ( Since a slurry) is obtained, an inorganic fine powder having specific constituent elements is used.

  As inorganic fine powder, fine powder such as fly ash, blast furnace slag, steelmaking slag, various ceramics, calcium carbonate, etc., and fine powder whose average circularity of particles has been increased by grinding treatment, heat treatment, classification treatment, etc. are used. These can be used alone or in combination of two or more. Commercially available products such as Seiden Business's final can be used suitably.

The inorganic fine powder, the Blaine specific surface area is preferably 4000cm ² / g~15000cm fine powder ² / g, more preferably fine powder of Blaine specific surface area of 4300cm ² / g~12000cm ² / g, more preferably 4700Cm ² / fine powder of g~10000cm ² / g, particularly preferably can be preferably used a fine powder of Blaine specific surface area of 5000cm ² / g~8000cm ² / g.

The inorganic fine powder preferably has a mean particle size of preferably 10.0 μm or less, more preferably 8.5 μm or less, more preferably 7.0 μm or less, and particularly preferably 6.0 μm or less. These fine powders can be preferably used.

The inorganic fine powder used in the present invention has a primary particle average circularity of preferably 0.915 to 1.000, more preferably 0.916 to 0.980, and more preferably. A fine powder of 0.917 to 0.970, particularly preferably a fine powder of 0.918 to 0.965, stabilizes fluidity with low temperature dependence and good flow properties and excellent material separation resistance. This is preferable.
In the present invention, water containing 0.001% of a dispersion aid is used as the dispersion medium, and the inorganic fine powder is dispersed by ultrasonic wave and stirrer stirring for 300 seconds. The particle size / shape distribution measuring instrument (PITA-1, Seisin Corporation) ) Is used to measure the circularity of the particles, and the average of 3000 observed particles is obtained to obtain the average circularity. Note that the average circularity is the projected area A of the observed particles and the value of 4πA / P ² when the perimeter length P is used.

  The inorganic fine powder is preferably 25 to 45% by mass, more preferably 27 to 43% by mass, more preferably 29 to 41% by mass, particularly preferably 100% by mass of the total mass of the hydraulic component and the inorganic fine powder. Is preferably 30 to 40% by mass.

  In the present invention, by mixing the hydraulic component, the hydraulic composition containing the inorganic fine powder having the specific constituent shown above, and water, excellent flow characteristics can be obtained in a short time. A hydraulic mortar (slurry) having good material separation resistance and low temperature dependence of flow characteristics can be obtained.

In the present invention, an excellent material is obtained by using a hydraulic component and an inorganic fine powder having a specific component, and further using a fine aggregate, and the hydraulic composition having a specific particle size configuration. It is possible to obtain hydraulic mortar (slurry) having separation resistance and good and stable fluidity and capable of avoiding blockage due to the arching phenomenon of aggregate even when pumped. it can.

  Fine aggregates include silica sand, river sand, sea sand, mountain sand, crushed sand, etc., silica powder, clay minerals, inorganic materials such as waste FCC catalyst, urethane crushed, EVA foam, resin pulverized products such as foamed resin, An alumina cement clinker aggregate or the like can be used.

  As for the fine aggregate, it is particularly preferable to use sand such as quartz sand, river sand, sea sand, mountain sand, crushed sand, quartz powder, waste FCC catalyst and the like.

In the present invention, the hydraulic composition includes fine aggregate, and the particle size constitution of the hydraulic composition preferably includes 20.5 to 30.0% by mass of particles of 1 μm to less than 8 μm, and 8 μm to 32 μm. Less than 10.0 to 25.0 mass%, more than 32 μm to less than 300 μm particles are included 10.0 to 40.0 mass%, and more than 300 μm to less than 850 μm particles are 15.0 to 50.0 mass%. %, And particles containing 0.0 to 2.0% by mass of particles of 850 μm or more can be suitably used.
More preferably, it contains 21.0-29.0% by mass of particles of 1 μm or more but less than 8 μm, 12.0-24.0% by mass of particles of 8 μm or more but less than 32 μm, and particles of 32 μm or more but less than 300 μm. 11.0-39.0% by weight, 300 μm or more to less than 850 μm of particles 16.0 to 48.0% by weight, 850 μm or more of particles containing 0.0 to 1.0% by weight are preferably used it can.
More preferably, 22.0-27.0% by mass of particles of 1 μm or more and less than 8 μm are contained, 15.0-22.0% by mass of particles of 8 μm or more but less than 32 μm are contained, and particles of 32 μm or more but less than 300 μm are contained. 12.0-38.0% by mass, 300 μm or more but less than 850 μm of particles 17.0 to 46.0% by mass, 850 μm or more of particles containing 0.0 to 0.5% by mass are preferably used it can.
Particularly preferably,
12.0 to 27.0% by mass of particles of 1 μm to less than 8 μm, 15.0 to 20.0% by mass of particles of 8 μm to less than 32 μm, 25.0 to less than 32 μm to less than 300 μm A particle containing 38.0% by mass, containing particles having a particle size of 300 μm or more but less than 850 μm in a range of 18.0 to 30.0% by mass and particles having a particle size of 850 μm or more being 0.0 to 0.2% by mass can be suitably used.

  When the particle size constitution of the hydraulic composition containing the fine aggregate is not within the above range, the hydraulic mortar (slurry) becomes difficult to stably obtain excellent material separation resistance, and the hydraulic mortar (slurry) ) Is pumped using a slurry pump, the aggregate in the hydraulic mortar (slurry) may cause an arching phenomenon and be blocked, which is not preferable.

  The amount of fine aggregate used is preferably 20 to 200 parts by weight, more preferably 40 to 190 parts by weight, more preferably 60 to 180 parts by weight, and particularly preferably 80 to 170 parts by weight with respect to 100 parts by weight of the hydraulic component. By setting it as the range of a mass part, the outstanding fluidity | liquidity property, material-separation resistance, and favorable hardened | cured material strength expression property are obtained, and it is preferable.

  In the present invention, in order to obtain a hydraulic mortar (slurry) having good flow characteristics by kneading the hydraulic composition and water, an inorganic fine powder and fine bones having a hydraulic component and specific constituent elements are obtained. It is preferable to use a material to make a hydraulic composition having a specific particle size configuration, and to further use a fluidizing agent and a thickener. Furthermore, in the present invention, in order to avoid the complexity and quality fluctuation of hydraulic mortar (slurry) preparation in the field, in order to premix the components of the hydraulic composition in advance and provide it to the field, It is preferable to select and use a powdery fluidizing agent.

  The powdery fluidizing agent used in the present invention is not particularly limited, and is a formaldehyde condensate of melamine sulfonic acid, casein, calcium caseinate, lignin sulfonic acid, polyether, polyether polycarboxylic acid, etc. Any commercially available fluidizing agent can be used regardless of the type. The powdery fluidizing agent used in the present invention is preferably a polycarboxylic acid-based powdered fluidizing agent because good fluidity can be obtained in a short period of time, and a modified polycarboxylic acid-based powdery agent. A fluidizing agent can be particularly preferably used. A commercially available product such as Melflax 2651F manufactured by BASF can be suitably used.

The amount of the polycarboxylic acid-based fluidizing agent, based on 100 mass parts hydraulic component, preferably 0.001 to 5 parts by weight, more preferably 0.01 to 3 parts by weight, more preferably 0.03 ˜2 parts by mass, particularly preferably in the range of 0.05 to 1 part by mass, and if the addition amount is too small, the effect of rapidly dispersing the hydraulic component is poor and sufficient effect is not manifested, and too much. However, an effect commensurate with the amount added cannot be expected, and it is not only uneconomical, but is also not preferable because the change in fluidity with time and the viscosity of hydraulic mortar (slurry) may increase.

In the present invention, it is preferable to use a thickener in order to further enhance the material separation resistance of a hydraulic mortar (slurry) obtained by kneading the hydraulic composition and water.
As the thickener, cellulose-based, protein-based, latex-based, water-soluble polymer-based, and the like can be used, and in particular, cellulose-based can be used.

The addition amount of the thickener, with respect to 100 mass parts hydraulic component, preferably from 0.001 to 0.50 parts by weight, more preferably from 0.003 to 0.30 part by weight, more preferably 0.005 ~ 0.15 parts by mass, particularly preferably in the range of 0.01 to 0.08 parts by mass. If the addition amount is too small, the effect of suppressing material separation cannot be expected, and if it is too much, it is merely uneconomical. In addition, the viscosity of the mortar (slurry) is increased, and the fluidity may be impaired.

  The hydraulic composition used in the present invention is not limited to hydraulic components, inorganic fine powders, fine aggregates, fluidizing agents and thickeners. At least one or more components such as a regulator, an antifoaming agent, and a resin powder can be included.

As the expansion material, it is preferable to use a metal expansion material such as metal powder or an inorganic expansion material such as lime, and it is particularly preferable to use a metal expansion material and an inorganic expansion material in combination.

  As the metal-based expansion material, metal powder such as aluminum powder and iron powder can be used, and among these, the use of aluminum powder is particularly preferable in terms of specific gravity. As the aluminum powder, those conforming to the second type of JIS K-5906 “Aluminum powder for coating” can be preferably used.

Examples of the inorganic expansive material include Auin for calcium sulfoaluminate type, quick lime, quick lime-gypsum type, calcined dolomite and the like for lime type, and at least one selected from these can be used. As the lime-based expansion material, quick lime and quick lime-gypsum are preferable, and quick lime-gypsum is particularly preferable.
As the inorganic expansion material, for example, a material containing free quick lime as an expansion component or a commercial product having an ettringite-forming substance such as calcium sulfoaluminate as an expansion component can be used. Preferably, an expansion material containing, as an active ingredient, quick lime having an effect of enhancing strength under a low temperature environment by a hydration exotherm during reaction as well as a shrinkage compensation effect, in this case the quick lime content in the expansion material is not particularly limited, In the case where the quicklime content is high (including 100% by weight), the hydration reaction may proceed abruptly, so the content is preferably 80% by weight or less.

  The addition amount of the metal-based expansion material can be added within a range that does not impair the characteristics of the present invention depending on the hydraulic component used, and is preferably 0.0002 to 0.01 part by mass with respect to 100 parts by mass of the hydraulic component. More preferably, it is used in the range of 0.0005 to 0.008 parts by mass, more preferably 0.0008 to 0.006 parts by mass, and particularly preferably 0.001 to 0.005 parts by mass.

The added amount of the inorganic expansion material is preferably 1 to 30 parts by mass, more preferably 2 to 25 parts by mass, more preferably 3 to 20 parts by mass, and particularly preferably 4 to 15 parts by mass.

  The setting modifier can be appropriately added within a range that does not impair the characteristics, depending on the hydraulic component to be used, and the components, addition amount, and mixing ratio of the setting accelerator and setting retarder are appropriately selected to improve the fluidity, The pot life, curing properties, etc. can be adjusted.

  As the antifoaming agent, known materials such as synthetic materials such as silicon-based, alcohol-based and polyether-based materials or plant-derived natural materials can be used.

  The addition amount of the antifoaming agent can be added as long as the characteristics of the present invention are not impaired.

  As the resin powder, a resin powder prepared by spray-drying a polymer emulsion obtained by emulsion polymerization such as an ethylene / vinyl acetate copolymer and an acrylic polymer can be used.

When constituting the hydraulic composition used in the present invention, the preferred component constitution is a hydraulic composition having a specific particle size constitution including a hydraulic component, an inorganic fine powder having a specific constituent, and fine aggregate. In addition, it further contains a polycarboxylic acid-based powder fluidizing agent and a thickener.

In the case of constituting the hydraulic composition used in the present invention, the particularly preferred component constitution is a hydraulic composition having a specific particle size constitution including a hydraulic component, an inorganic fine powder having a specific constituent, and a fine aggregate. In addition, it further includes a polycarboxylic acid-based powder fluidizing agent, a thickener, a metal-based expansion material, and an inorganic expansion material.

  In the present invention, components selected from hydraulic components, inorganic fine powders and fine aggregates, fluidizing agents and thickeners, and, if necessary, expansion agents, setting modifiers, antifoaming agents, and powder resins. 1 type or more can be added, and it can mix with a mixer, and can obtain the premix powder of a hydraulic composition.

The hydraulic composition used in the present invention can quickly prepare a hydraulic mortar (slurry) having good flow characteristics and excellent material separation resistance by kneading with a predetermined amount of water.

In the present invention, the hydraulic composition and water are kneaded under the condition of kneading condition A, and the flow characteristics of the hydraulic mortar (slurry) obtained by the kneading operation are evaluated by the flow value.
The kneading condition A is a constant temperature room with a predetermined temperature and a humidity of 65%, using a hydraulic composition and water cured at the same temperature as the constant temperature room, and water having a predetermined water ratio shown in Tables 1 to 6 in a 2 L plastic container. Then, using a 0.15 KW stirrer equipped with a turbine blade having the shape shown in FIG. 5, 1500 g of the hydraulic composition was added while stirring at 300 rpm, and then kneaded at 780 rpm for 2 minutes to obtain a hydraulic mortar (slurry). Is prepared.

The hydraulic composition used in the present invention is prepared by kneading in a constant temperature room at a room temperature of 20 degrees under the conditions of the kneading condition A, and the flow value of the hydraulic mortar (slurry) measured in the constant temperature room is preferably A range of 250 to 330 mm, more preferably a range of 255 to 315 mm, more preferably a range of 260 to 305 mm, and particularly preferably a range of 280 to 300 mm is preferable because excellent fluidity can be secured quickly and stably. .

In the present invention,
The hydraulic composition was prepared in a constant temperature room at a room temperature of 20 degrees under the condition of the kneading condition A, and the flow value of hydraulic mortar (slurry) measured in the constant temperature room was defined as the flow value (X) at normal temperature. The hydraulic composition was prepared in a constant temperature room at a room temperature of 30 degrees under the condition of kneading condition A, and the flow value (Y) of the hydraulic mortar (slurry) measured in the constant temperature room was set as the flow value at high temperature. The hydraulic composition was prepared in a constant temperature room at a room temperature of 5 degrees under the condition of kneading condition A, and the flow value (Z) of the hydraulic mortar (slurry) measured in the constant temperature room was defined as the flow value at low temperature. In this case, the ratio of X and Y is preferably in the range of Y / X = 0.80 to 1.10, more preferably in the range of Y / X = 0.82 to 1.07, and more preferably Is in the range of Y / X = 0.84 to 1.05, particularly preferably Y / X = 0.85. It is preferably in the range of .03.
Furthermore, the ratio of X and Z is preferably in the range of Z / X = 0.90 to 1.10, more preferably in the range of Y / X = 0.92 to 1.07, more preferably Y / X = 0.94 to 1.06, particularly preferably Z / X = 0.95 to 1.05 is a hydraulic mortar (slurry) having excellent flowability throughout the year. ) Is obtained stably and workability is improved.
When Y / X and / or Z / X is out of the above range, the fluidity is impaired at high temperature or low temperature, and the properties of the hydraulic mortar (slurry) must be finely adjusted. Is unfavorable because of lowering.

The hydraulic composition used in the present invention is prepared by kneading in a constant temperature room at a room temperature of 20 degrees under the condition of kneading condition A, and the J14 funnel flow time of hydraulic mortar (slurry) measured in the constant temperature room is preferably Is in the range of 4.0 to 15.0 seconds, more preferably in the range of 4.5 to 12.0 seconds, and particularly preferably in the range of 5.0 to 10.0 seconds. It is preferable because a hydraulic mortar (slurry) that can be secured stably and has excellent material separation resistance can be obtained stably.

  The hydraulic composition used in the present invention adjusts the fluidity of the hydraulic mortar (slurry), the material separation resistance, and the strength of the cured product obtained by further curing by adjusting the amount of water added. can do.

  The amount of water added can be appropriately selected and used depending on the hydraulic component or hydraulic composition used. The amount of water added is preferably 8.0 to 50.0 parts by mass, more preferably 9.0 to 40.0 parts by mass, and even more preferably 10.0 to 30. parts by mass with respect to 100 parts by mass of the hydraulic composition. It is preferable to add 0 parts by mass, particularly preferably 11.0 to 25.0 parts by mass.

The water ratio, which is the ratio of the hydraulic composition to water, is preferably 0.080 to 0.500, more preferably 0.090 to 0.400, more preferably 0.100 to 0.300, and particularly It is preferable to add 0.110 to 0.250 for use. In addition, the value which remove | divided the addition amount of water by the mass of the water constituent composition is used for a water ratio.

The cured body of hydraulic mortar (slurry) preferably has the following characteristics in order to exhibit highly durable characteristics.
1) Compression strength (age of 28 days) is preferably 40N / mm ² or more, more preferably 41N / mm ² or more, more preferably 41.5N / mm ² or more, particularly preferably at 42N / mm ² or more .
2) The length change rate (age 7 days) is preferably −30 × 10 ⁻⁴ or more, more preferably −25 × 10 ⁻⁴ or more, and particularly preferably −24 × 10 ⁻⁴ or more.
3) The maximum temperature of the simple adiabatic curing temperature is preferably 93 ° C or lower, more preferably 90 ° C or lower, and particularly preferably 85 ° C or lower.

  The hydraulic composition used in the present invention is a hydraulic composition for grout used for civil engineering and construction work, which comprises a hydraulic component and an inorganic fine powder as essential components, and is briefly mixed with water. In addition, it is possible to stably prepare a hydraulic mortar (slurry) having excellent flow characteristics and excellent material separation resistance and low temperature dependence of the flow characteristics.

The construction method of the hydraulic mortar (slurry) of the present invention includes a kneading apparatus (mixer) capable of obtaining a powerful kneading force between the above-mentioned hydraulic composition that is quickly kneaded and exhibits stable fluidity, and water. It is used and kneaded continuously, and hydraulic mortar (slurry) is continuously prepared and temporarily stored in a reservoir tank. Furthermore, by using a stirrer having a composite stirring vane disposed and strong vertical convection threaded helical stirring Ru raises plate and a paddle stirrer plate for a predetermined time stirred cured in a forced stirring conditions the slurry, It is possible to prepare hydraulic mortar (slurry) whose slurry state is extremely stable without causing material separation, and to supply hydraulic mortar (slurry) continuously to the construction site in a narrow part using a slurry pump. In this case, it is possible to stably supply and drive to the construction site without causing material separation in the pumping process, and to provide high construction efficiency and excellent construction quality.

The construction method of the hydraulic mortar (slurry) of the present invention includes tunnel and shield backfilling, dam joints, bridge shu, structure repair and reinforcement, reinforcing joints, fixing machine foundations, sewer repairs, etc.・ In various grouting works in the construction field, the value of use is great because performance such as high fluidity, non-shrinkage and high strength can be stably provided.
In particular, when a large amount of grouting is performed at a large-scale site, hydraulic mortar (slurry) is continuously prepared, and when it is continuously supplied to the construction site and installed, its performance is greatly improved. It is something that demonstrates.

  Hereinafter, the present invention will be described in more detail based on examples. However, the present invention is not limited by the following examples.

(Characteristic evaluation method)
1) J ₁₄ funnel flow down (seconds):
In conformity with JSCE Filling Mortar test method (draft) (JSCE · F542-1993), showing the falling value by _{J 14} funnel method grout slurry.
2) Flow test:
Using hydraulic mortar (slurry) kneaded under kneading conditions A, evaluation is performed in accordance with the guidelines for building repair work management. A pipe made of vinyl chloride having an inner diameter of 50 mm and a height of 100 mm is placed on a glass sheet having a thickness of only 5 mm, filled with slurry, and then pulled up. After the spread has stopped, the diameters in two perpendicular directions are measured, and the average value is taken as the flow value.
3) Separation: Based on the breathing bag method (JSCE F522-1999), the content of breathing is 2% or less: separation is present, and no: separation is not performed.
4) Compressive strength (N / mm ² ):
A test specimen cured using a hydraulic mortar (slurry) kneaded at a temperature of 20 ° C. and a humidity of 65%, cured at a temperature of 20 ° C. and a humidity of 95%, demolded the next day, and then cured in water at 20 ° C. for a predetermined period. Evaluation is performed according to JIS A-1108 using φ5 × 10 cm.
5) Pump pumpability:
Evaluation is performed by connecting a slurry hose having an inner diameter of 32 cm and a length of 10 m, 50 m or 100 m to the outlet of the discharge pump of the mixer apparatus.

The pump is a MONO pump, model number: 2NM50 (Hyojin Equipment Co., Ltd.).
Discharge amount is a value obtained by filling a 10-liter container with hydraulic mortar (slurry) at a 100m hose length connected to a slurry pump, and dividing the volume of the 10-liter container by the time required from the start to the end of filling. And
The evaluation index of the pressure-feeding test having a tapered tube at the end of the hydraulic mortar (slurry) is: ○: no blockage, x: blockage.
Pressure feed test with tapered tube at the tip of hydraulic mortar (slurry): The taper tube shown in FIG.
6) Length change rate:
The length change rate is measured using the apparatus shown in FIG. The length change rate is measured by placing hydraulic mortar (slurry) immediately after kneading to the height of the mold inside the mold, and measuring the length change immediately after casting, with a measurement interval of every 10 minutes. And measure up to 7 days of age. The measurement conditions are 20 ° C. and RH 65%.

The rate of change in length of the hydraulic mortar (slurry) when cured is the amount of change (mm) in the distance between the end of the displacement sensor shown in FIG. 7 (a) and the SUS disk adjacent to the end of the displacement sensor. Is a value obtained by dividing by a distance (b = 480 mm) between two SUS disks located inside a cured body of hydraulic mortar (slurry).
7) Simple insulation curing temperature:
The simple adiabatic curing temperature is measured using the apparatus shown in FIG. The simple adiabatic curing temperature is measured by placing hydraulic mortar (slurry) immediately after kneading into the mold in the heat insulating material, and starting the measurement of the simple adiabatic curing temperature immediately after placing, with a measurement interval of every 5 minutes. Do. The measurement conditions are 20 ° C. and RH 65% in a constant temperature room.
8) Kneading condition A:
In a thermostatic chamber with a predetermined temperature and a humidity of 65%, using a hydraulic composition and water cured at the same temperature as the thermostatic chamber, water having a predetermined water ratio shown in Tables 1 to 6 is put into a 2 L plastic container and shown in FIG. Using a 0.15 KW stirrer equipped with turbine blades (manufactured by Shinto Kagaku Co., Ltd., product number: Three-One Motor BL600), 1500 g of the hydraulic composition was added while stirring at 300 rpm, and then kneaded at 780 rpm for 2 minutes. Preparation of a hard mortar (slurry) is referred to as kneading condition A.
9) Measuring method of particle size distribution (measuring condition A):
Measured using a laser particle size analyzer (LMS-30, Seishin Corporation) in which ethyl alcohol is used as the dispersion medium, fine inorganic powder is dispersed by ultrasonic wave and stirrer stirring for 60 seconds, and the refractive index is set to 1.330. To do.
10) Method for measuring average circularity (measurement condition B):
Use water with 0.001% dispersion aid as the dispersion medium, disperse the inorganic fine powder by ultrasonic wave and stirrer stirring for 300 seconds, and use a particle size / shape distribution measuring instrument (PITA-1, Seishin company). The average of 3,000 observation particles is obtained to obtain the average circularity. Note that the average circularity is the projected area A of the observed particles and the value of 4πA / P ² when the perimeter length P is used.

The following materials were used.
1) Hydraulic component:
Portland cement (Ube Hayashi cement, Blaine specific surface area 4500 cm ² / g).

The evaluation method of the specific surface area is measured using a brain air permeation device defined in JIS R-5201. Table 7 shows the particle size composition of Portland cement measured using a sieve.
2) Inorganic fine powder / inorganic fine powder a: Fineash (manufactured by Yoden Business Co., Ltd., Blaine specific surface area = 5800 cm ² / g, average circularity = 0.921, average particle diameter = 4.7 μm)
Inorganic fine powder b: fly ash JIS type II (manufactured by Yoden Business Co., Ltd., Blaine specific surface area = 3510 cm ² / g, average circularity = 0.904, average particle size = 13.2 μm)
Inorganic fine powder c: fly ash JIS / IV type (manufactured by Yoden Business Co., Ltd., Blaine specific surface area = 2320 cm ² / g, average circularity = 0.766, average particle size = 22.7 μm)
Inorganic fine powder d: Calcium carbonate (manufactured by Ube Materials, Blaine specific surface area = 5820 cm ² / g, average circularity = 0.905, average particle size = 7.6 µm)
Inorganic fine powder e: Shinko Powerment (manufactured by Kobe Steel, Blaine specific surface area = 4630 cm ² / g, average circularity = 0.895, average particle size = 10.8 µm)
The Blaine specific surface area of the inorganic fine powders a to e is measured by using a Blaine air permeation device defined in JIS R-5201.
The average circularity of the inorganic fine powders a to e was measured under the measurement condition B.
The average particle size of the inorganic fine powders a to e and the particle size constitution of the inorganic fine powder a shown in Table 7 were measured under the measurement condition A.
3) Fine aggregate:
Silica sand A: SS5A, manufactured by Ube Sand Industry Co., Ltd.
-Silica sand B: S6, Ube sand industry company make.
Silica sand C: S7, manufactured by Ube Sand Industries.
-Silica sand D: No. 5 rough, manufactured by Ashiya company.
Silica sand E: SC6, manufactured by Yamakawa Sangyo Co., Ltd.
Silica sand F: S8, manufactured by Yamakawa Sangyo Co., Ltd.

Table 6 shows the particle size composition of the silica sands A to F measured using a sieve.
4) Expansion material:
Inorganic expansion material: Asano dibucar (manufactured by Taiheiyo Materials).
Metal expandable material: aluminum powder (particle size 44 μm or less, 60% or more, manufactured by Daiwa Metal Powder Industry Co., Ltd.).
5) Water reducing agent:
Fluidizing agent a: polycarboxylic acid-based fluidizing agent, Melflax AP101F (manufactured by BASF Pozzolith).
Fluidizer b: polycarboxylic acid-based fluidizer, Melflax 2651F (manufactured by BASF Pozzolith).
6) Thickener: Cellulosic thickener, High Euros (manufactured by Ube Industries).

(Comparative Examples 1-11, Examples 1-2)
A hydraulic mortar (slurry) was prepared by kneading the hydraulic composition and water at a blending ratio shown in Table 1 under the condition of room temperature of 20 ° C. according to the kneading condition A, and the flow value (immediately after kneading) , After 10 minutes of kneading), the J ₁₄ funnel flow value (seconds) and the material separation situation were measured. The compressive strength was measured for a cured hydraulic mortar (slurry) obtained by curing a slurry prepared by kneading the hydraulic composition under kneading conditions A. Flow value, J ₁₄ funnel flow value (in seconds), the measurement result of the separation conditions and compressive strength are shown in Table 1. In addition, Table 1 shows the characteristics of the used inorganic fine powders a to e.

(Comparative Examples 12-14, Examples 3-8, Reference Example 1)
A hydraulic mortar (slurry) was prepared by kneading the hydraulic composition and water at the blending ratio shown in Table 2 under the condition of room temperature of 20 ° C. according to the kneading condition A, and the flow value (immediately after the kneading) , After 10 minutes of kneading), the J ₁₄ funnel flow value (seconds) and the material separation situation were measured. The compressive strength was measured for a cured hydraulic mortar (slurry) obtained by curing a slurry prepared by kneading the hydraulic composition under kneading conditions A. Flow value, J ₁₄ funnel flow value (in seconds), the measurement result of the separation conditions and compressive strength are shown in Table 2. Table 2 shows the characteristics of the used inorganic fine powder a and the particle size constitution of the hydraulic composition.

(Comparative Examples 15 and 16, Examples 9 and 10)
A hydraulic mortar (slurry) was prepared by kneading the hydraulic composition and water at the blending ratios shown in Table 3 at room temperature 5 ° C., 20 ° C., and 30 ° C. according to the kneading condition A. flow value (immediately after mixing) and J ₁₄ funnel flow value changes over time (in seconds) was measured Te. Flow value, J ₁₄ and funnel flow value measurement results (in seconds) shown in Table 3. Table 3 shows the characteristics of the inorganic fine powder a used and the particle size constitution of the hydraulic composition.

(Comparative Examples 17 and 18, Examples 11 and 12)
A hydraulic mortar (slurry) is prepared by kneading the hydraulic composition and water at a blending ratio shown in Table 4 under the condition of room temperature of 20 ° C. according to the kneading condition A, and the flow value (immediately after the kneading) 10 minutes after kneading, 20 minutes after kneading, 30 minutes after kneading). Table 4 shows the measurement result of the flow value, the characteristics of the used inorganic fine powder a, and the particle size constitution of the hydraulic composition.

(Comparative Examples 19 and 20, Examples 13 to 17)
A hydraulic composition was prepared at a blending ratio shown in Table 5 under conditions of room temperature of 5 ° C, 20 ° C, and 30 ° C.
The hydraulic composition was prepared in a constant temperature room at 20 ° C. under the condition of kneading condition A, and the flow value of hydraulic mortar (slurry) measured in the constant temperature room was the flow value (X) at normal temperature and water. A hard composition was prepared in a temperature-controlled room at 30 ° C. under the condition of kneading condition A, and the flow value (Y) of hydraulic mortar (slurry) measured in the temperature-controlled room was the flow value at high temperature, hydraulic The composition was prepared in a constant temperature room at 5 ° C. under the condition of kneading condition A, and the flow value (Z) of hydraulic mortar (slurry) measured in the constant temperature room was measured for the flow value at low temperature. Table 5 shows the measurement results.
Table 5 shows the characteristics of the used inorganic fine powder a and the particle size constitution of the hydraulic composition.

(Example 18, Reference Examples 2-3)
Using the hydraulic compositions of Example 18 and Reference Examples 2-3, a slurry production / supply device (FIG. 1 (Example 18, Reference Example 2) including a hydraulic composition and a predetermined amount of water with a mixer device. ) And FIG. 2 (Reference Example 3)), and continuously kneaded to continuously produce hydraulic mortar (slurry), and the slurry was once stored in a reservoir tank.
In the case of Reference Example 3, the hydraulic mortar (slurry) was held in the reservoir tank shown in FIG. 2 for about 3 minutes with gentle stirring, and then discharged using the discharge pump (slurry pump) of the slurry production facility. .
Further, in Example 18 and Reference Example 2, the hydraulic mortar (slurry), composite stirring vane about 3 minutes reservoir tank shown in FIG. 1, respectively, and a screw spiral agitating plate and paddle type stirrer plate positioned After being kept under forced stirring conditions by a stirrer having the above, it was discharged using a discharge pump (slurry pump) of a slurry production facility.

The hydraulic mortar (slurry) discharged from the discharge pump (slurry pump) of the slurry production facility is 0 m immediately after discharge from the pump, the inner diameter connected to the pump is 32 mm, and the length is 10 m, 50 m, 75 m and 100 m. The pumping ability was evaluated by discharging from the tube tip. In addition, slurry manufactured continuously and stored in a reservoir tank, and a discharge pump (slurry pump) are used, and immediately after discharge from the pump, the slurry is discharged from the tube tip of 10 m, 50 m, 75 m and 100 m slurry hoses. The flow value and the J ₁₄ funnel flow-down value (seconds) were measured.
The amount of water contained in the slurry was measured by taking a part of the slurry stored in the reservoir and using a microwave oven method.
Pumpability, Table 7 shows the measurement results of the flow value and J ₁₄ funnel flow value.

Further, using a hydraulic mortar (slurry) prepared by kneading the hydraulic composition of Example 18 and Reference Example 2 and water according to the kneading condition A under the condition of room temperature of 20 ° C., the rate of change in length and A simple adiabatic curing temperature was measured. The length change rate measurement results and the simple adiabatic curing temperature measurement results are shown in FIGS. 8 and 9, respectively.

In the case of Examples 1 and 2 using inorganic fine powders having specific constituent elements, the flowability of the slurry kneaded under the kneading conditions A as shown in Table 1 is superior to those of Comparative Examples 1 to 11, and good material separation is achieved. Resistance is obtained.
Further, a hydraulic composition comprising a polycarboxylic acid-based powder fluidizing agent and a thickener, comprising an inorganic fine powder having an average circularity of 0.921, a hydraulic component and a fine aggregate, the hydraulic composition In Examples 3 to 8 having a specific particle size configuration, the flowability is further improved and high material separation resistance is exhibited.
Further, when an inorganic fine powder having an average circularity of 0.921 is used and a hydraulic composition having a specific particle size configuration is used, as shown in Examples 9 and 10, a low temperature (5 ° C.), a normal temperature (20 ° C.), high temperature (30 ° C.) flow value and J14 funnel flow time are less different, and as shown in Examples 11 and 12, with respect to the lapse of kneading time (from kneading to kneading 30 minutes), High flow value stability (low flow loss).
Further, when an inorganic fine powder having an average circularity of 0.921 was used and a hydraulic composition having a specific particle size configuration was used, as shown in Examples 13 to 17, the temperature change and the water ratio (the amount of kneading water / Even if the hydraulic composition is changed, Z / X shows a value between 0.97 and 1.02, Y / X shows a value between 0.91 and 0.98, and a stable flow The value is obtained.

Using the hydraulic compositions of Reference Example 2 and Reference Example 3, actual machine evaluation (fluidity evaluation, pumpability evaluation) using a hydraulic mortar (slurry) production and supply device (Fig. 1 or Fig. 2) was performed. In this case, Reference Example 2 showed better flow characteristics (flow value and J14 funnel flow value). As shown in Table 7, the J14 funnel flow value, which is an index of flow characteristics, showed a stable value in 12 seconds or less, and good pumpability was obtained even at a pumping distance of 100 m even at a pumping distance. This can be achieved by a hydraulic mortar in the reservoir tank (slurry), the predetermined time forced stirring curing using the composite stirring vane disposed a high stirring force is that obtained screw spiral agitating plate and paddle type stirrer plate As a result of obtaining a necessary and sufficient kneaded state in a short time, it is presumed that the fluidity is stabilized.

Using the hydraulic composition shown in Example 18 and Reference Example 2, the prepared slurry using a hydraulic mortar (slurry) production and supply device (FIG. 1) was pumped and passed through a 100 m slurry hose. A pressure feeding experiment having a tapered tube at the end of the hose tube was conducted. In Reference Example 2, an occlusion phenomenon that seems to be caused by the arching phenomenon of the aggregate was generated, whereas in Example 18, the occlusion phenomenon accompanying the material separation was not observed, and good pumpability was obtained. When the hydraulic mortar (slurry) of Example 18 is used, the hydraulic mortar (slurry) having excellent flowability is suitable for the narrow part through the 100 m slurry hose and the taper tube at the end of the hose tube by pumping. Can be filled.
Moreover, as for the hardening body of the hydraulic mortar (slurry) using the hydraulic composition of Example 18, the length change rate is significantly reduced as shown in FIG. 8, and the adiabatic temperature as shown in FIG. An increase also shows a small value and a highly durable hardened | cured material can be obtained.

It is a schematic cross-sectional view for explaining an example of the configuration of the installed slurry production and supply equipment a composite stirring vane disposed threadably spiral agitating plate and a paddle agitating plate in the reservoir tank. (Used in Example 18, Reference Example 2) FIG. 4 is a schematic cross-sectional view for explaining an example of the configuration of a slurry production / supply device in which a stirrer screw (Sneck stirring blade) is installed in a reservoir tank. (Used in Reference Example 3) Is a diagram illustrating an overall configuration of a composite stirring blade roots arranged threaded helical stirring plate Ru used in the present invention and a paddle type stirrer plate. FIG. 2 is a schematic diagram showing the overall configuration of a hydraulic mortar (slurry) preparation / construction truck equipped with a tank for storing a hydraulic composition and a slurry production / supply device. 4 is a schematic diagram showing turbine blades used when preparing hydraulic mortar (slurry) under kneading conditions A. FIG. It is a figure which shows an example of the taper pipe | tube attached to the slurry hose front-end | tip in the pumping test of hydraulic slurry. It is a schematic diagram which shows the outline | summary of the measuring device which measures a length change rate. It is a figure which shows the length change rate of the mortar (slurry) hardening body using the hydraulic composition of this invention. It is a figure which shows the heat insulation temperature rise of the mortar (slurry) hardening body using the hydraulic composition of this invention. It is a schematic diagram which shows the outline | summary of the measuring device which measures simple adiabatic temperature.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10: Kneading screw 11: Slurry manufacturing and supply apparatus 12: Hydraulic composition 13: Hopper 14: Hopper screw 15: Water supply port 16: Kneading apparatus (mixer)
17: Water 18: Mortar (slurry) outlet 19: Hydraulic mortar (slurry)
20: Reservoir tank 21: Hydraulic mortar (slurry)
22: stirrer screw (composite stirring vane disposed threadably spiral agitating plate and paddle agitating plate)
23: Transfer screw 24: Snake pump (slurry pump)
25: Hydraulic mortar (slurry)
26, 27: Motor 28: Power transmission belt 30: Stirrer screw (Snake stirring blade)
31: Truck for hydraulic mortar / slurry preparation / construction 32: Supply port for hydraulic composition 33: Hydraulic composition tank 34: Hydraulic slurry 35: Kneading device (mixer)
36: Hopper 37: hydraulic composition 38: Screw feeder 39: water tank 40: Water supply pump 41: water supply pipe 42: screw spiral agitating plate composite stirring blade 43 disposed a paddle agitating plate: hydraulic Slurry tank (reservoir tank)
44: Slurry pump 45: Slurry hose

Claims (7)

A hydraulic composition comprising a hydraulic component and inorganic fine powder, and kneading apparatus and water is kneaded continuously preparing hydraulic mortar (slurry), and the reservoir tank containing the hydraulic mortar (slurry) , a hydraulic mortar in 該Ri Zabatanku (slurry) in construction methods that example Bei a slurry pump for continuously pumping hydraulic mortar (slurry) hydraulic mortar with preparation and construction equipment (slurry) And
The hydraulic mortar (slurry), the stirring shaft in the reservoir tank is disposed in a horizontal direction, 1 by agitator having a composite stirring vane disposed threadably spiral agitating plate and a paddle agitating plate to the agitation拌軸. Forced stirring and curing for 5 to 20 minutes continuously ,
The inorganic fine powder, fly ash, blast furnace slag, steel slag, and ceramic, or calcium carbonate, Blaine specific surface area of 4000cm ² / g~15000cm ² / g, an average particle size of 10.0μm or less, an average degree of circularity 0 .915 to 1.000,
The inorganic fine powder in a total mass of 100% by mass of the hydraulic component and the inorganic fine powder is 25 to 45% by mass,
The helical stirring plate of the composite stirring blade is spirally arranged around the stirring shaft, and the paddle type stirring plate of the composite stirring blade is axially symmetrical with an inclination angle between the adjacent spiral stirring plates. The construction method of the hydraulic mortar (slurry) characterized by being arrange | positioned at the said stirring shaft so that it may become a position of this . A tank for storing hydraulic composition comprising a hydraulic component and inorganic fine powder, and kneading apparatus for continuously preparing a hydraulic mortar (slurry) by kneading a water the hydraulic composition, the hydraulic a reservoir tank containing a mortar (slurry) was used hydraulic mortar (slurry) hydraulic mortar (slurry) truck preparation and construction which continuously example Bei a slurry pump for pumping in 該Ri Zabatanku water It is a construction method of hard mortar (slurry),
The hydraulic mortar (slurry), the stirring shaft in the reservoir tank is disposed in a horizontal direction, 1 by agitator having a composite stirring vane disposed threadably spiral agitating plate and a paddle agitating plate to the agitation拌軸. Forced stirring and curing for 5 to 20 minutes continuously ,
The inorganic fine powder, fly ash, blast furnace slag, steel slag, and ceramic, or calcium carbonate, Blaine specific surface area of 4000cm ² / g~15000cm ² / g, an average particle size of 10.0μm or less, an average degree of circularity 0 .915 to 1.000,
The inorganic fine powder in a total mass of 100% by mass of the hydraulic component and the inorganic fine powder is 25 to 45% by mass,
The helical stirring plate of the composite stirring blade is spirally arranged around the stirring shaft, and the paddle type stirring plate of the composite stirring blade is axially symmetrical with an inclination angle between the adjacent spiral stirring plates. The construction method of the hydraulic mortar (slurry) characterized by being arrange | positioned at the said stirring shaft so that it may become a position of this . Wherein the composite stirring vane inner diameter of the cylinder to be inscribed (diameter) is 150 mm to 300 mm, the length of the composite stirring blade of the stirring shaft direction, claim 1, wherein, wherein the Dearuko 300mm~1200mm Item 3. A construction method of hydraulic mortar (slurry) according to item 2. The hydraulic mortar (slurry) is pumped and applied to a construction site through a slurry hose connected to a slurry pump, and the slurry hose has an inner diameter (diameter) of 20 mm to 55 mm and a length of 75 m to construction method of hydraulic mortar according (slurry) in any one of claims 1 to 3, wherein the Dearuko 200 meters. The hydraulic composition includes fine aggregate, and the hydraulic composition includes:
Containing 20-30% by mass of particles of 1 μm or more and less than 8 μm,
Containing 10 to 25% by mass of particles of 8 μm or more and less than 32 μm,
Including 10 to 40% by mass of particles of 32 μm or more and less than 300 μm,
Including 15 to 50% by mass of particles of 300 μm or more and less than 850 μm,
The construction method of hydraulic mortar (slurry) according to any one of claims 1 to 4 , comprising 0 to 2% by mass of particles of 850 µm or more. The hydraulic composition further includes a fluidizing agent and a thickening agent,
The hydraulic composition and hydraulic mortar obtained and water was kneaded (slurry), a flow value X when normal temperature, flow value Y at a high temperature, the ratio of the flow value Z at low temperature, 0 . 80 <Y / X <1.10 and 0.90 <Z / X <1.10 der Turkey and the characterized claims 1-5 hydraulic mortar according to any one of the (slurry) Construction method. The hydraulic composition, method of constructing the hydraulic mortar (slurry) according to any one of claims 1 to 6, characterized in that it is a grout material for civil engineering and construction.

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