JP7337674B2 - Method for manufacturing cement material - Google Patents

Description

The present invention relates to a method for producing cement material.

Various developments have been made so far on methods for producing cement materials using powder raw materials. As this type of technology, for example, the technology described in Patent Document 1 is known. Patent Document 1 describes a method in which a bag made of water-soluble paper in which hollow microspheres are encapsulated is post-added to concrete and then kneaded (Claim 1 of Patent Document 1, etc.).

JP 2017-159532 A

However, as a result of investigation by the present inventor, it was found that there is room for improvement in terms of dust prevention, work efficiency, and pumpability in the cement material production method described in Patent Document 1 above.

The bag made of water-soluble paper described in Patent Document 1 is usually transported manually by an operator. For this reason, an increase in the transport amount has increased the burden on the operator.

The present inventor studied a new method of conveying the raw material powder, and found that the work efficiency could be improved by using a pipe to suck and pump the raw material powder contained in a bag.
However, it has been found that in the method of opening a bag containing a powdery raw material and sucking from the opening, the powdery raw material is dusted and workability is reduced. In addition, it was found that there are powder raw materials that are difficult to suction and feed depending on the characteristics of the powder raw materials.

As a result of further intensive research based on these findings, it was found that by using powder raw materials with a degree of agglomeration of 50% or less, suction and pressure feeding from inside the bag becomes possible, and a nozzle connected to the tip of a pipe is inserted into the bag. As a result, the powdery raw material can be sucked and pumped from the inside of the bag without opening the bag, so that the working efficiency can be improved and dusting can be suppressed, and the present invention has been completed.

According to the invention,
A preparation step of preparing a bag containing a powder raw material with a cohesion degree of 50% or less obtained by the following procedure;
a pumping step of sucking the powdery raw material from the nozzle in a state in which the nozzle is inserted into the bag and pumping the powdery raw material into a container through a pipe connected to the nozzle;
A method of making a cementitious material is provided, comprising:
(procedure)
(1) Using the powder raw material, the loose bulk density A and the hard bulk density P are obtained as follows, and using A and P, the average bulk density is calculated from the formula I: (A + P) / 2. demand.
First, the raw material powder is passed through a sieve with an opening of 710 μm to obtain a sample for measurement. The resulting sample for measurement was filled in a 100 cc container and ground without tapping, and then the loose bulk density (g/cm ³ ) of the sample for evaluation in the container was measured. Subsequently, the obtained measurement sample is filled in a 100 cc container, tapped 180 times in the vertical direction, and ground, and then the hard bulk density (g / cm ³ ) is measured.
(2) Three sieves corresponding to the average bulk density value obtained in (1) are selected based on the following criteria.
If the average bulk density is 0.4 g/cm ³ or less, select an upper sieve with an opening of 350 μm, a middle sieve with an opening of 250 μm, and a lower sieve with an opening of 150 μm, and the average bulk density exceeds 0.4 g/cm ³ 0 If the average bulk density is less than 9 g/cm ³ , select an upper sieve with an opening of 250 μm, a middle sieve with an opening of 150 μm, and a lower sieve with an opening of 75 μm ^. An upper sieve with an opening of 75 μm, a middle sieve with an opening of 45 μm, and a lower sieve with an opening of 45 μm are selected.
(3) Place 2 g of the powder raw material on the upper sieve of the three-stage sieve selected in (2), and vibrate the three-stage comb under the conditions of an amplitude of 1 mm and a vibration time T calculated as follows. Shake using a vibrating sieve device with
The vibration time T (seconds) is calculated from Equation II: T=20+[(1.6−W)/0.016].
The dynamic bulk density W (g/cm ³ ) in Formula II is calculated from Formula III: W=(P−A)×C/100+A.
The degree of compression C (%) in Formula III is calculated from Formula IV: C=(P−A)/P]×100.
(4) After (3), the weight (g) of the powder raw material remaining on the upper, middle and lower sieves is measured and defined as X, Y and Z, respectively. Using the obtained X, Y, and Z, the cohesion degree (%) of the raw material powder is calculated from the following formula V.
Formula V: Cohesion % = [(X/2) x 100] + [(Y/2) x 100 x (3/5)] + [(Z/2) x 100 x (1/5)]

ADVANTAGE OF THE INVENTION According to this invention, the manufacturing method of the cement material excellent in dust prevention, work efficiency, and pumpability is provided.

FIG. 4 is a schematic diagram for explaining a method of sucking and pumping the powder raw material in the bag.

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. In addition, in all the drawings, the same constituent elements are denoted by the same reference numerals, and the description thereof will be omitted as appropriate. Also, the drawings are schematic diagrams and do not correspond to actual dimensional ratios.

A method for producing the cement material of the present embodiment will be outlined.

The cement material manufacturing method includes a preparation step of preparing a bag containing a powder raw material with a cohesion degree of 50% or less, which is required by the following procedure, and a state in which the nozzle is inserted into the bag, and the powder raw material is sucked from the nozzle. and a pumping step of pumping the powder raw material into the container through a pipe connected to the nozzle.

According to the findings of the present inventors, by inserting a nozzle connected to the tip of a pipe into an unopened bag, the raw material powder is sucked from the bag without opening the bag, and a predetermined amount of It was found that, because the powder material can be pumped to the container, the work efficiency can be improved compared to the case where the bag itself is conveyed, while suppressing dusting of the raw powder material.

Further, according to the findings of the present inventors, it has been found that suction pressure feeding from inside the bag becomes possible by using a powder raw material having a degree of cohesion equal to or less than a predetermined value.

In the following, the results of examination of the technical relationship between the powder properties of the powder raw material and the suction and pressure feeding will be described in detail.

The inventor of the present invention carried out suction and pressure feeding of a plurality of types of powder raw materials enclosed in a bag, and found that not only those that could be suction and pressure fed but also clogging occurred during suction. In addition, the pumping was sometimes interrupted due to clogging.

With regard to such clogging of powder, the relationship with powder characteristics was earnestly investigated. As a result, although the degree of compression, which is generally used as an index of fluidity, was used and a powder with a small degree of compression was selected, it was not possible to stably suction and pump such powder.

As a result of further studies, the inventors have found that by adopting the degree of agglomeration as an index and setting the degree of agglomeration to a predetermined value or less, it is possible to stably realize suction and force feeding of powder. Although the detailed mechanism is not clear, the degree of cohesion is not a general indicator of fluidity, but it can cause problems such as clogging in the pump or hose in the suction and pressure feeding process of the powder raw material enclosed in the bag. It is an index that can be used to evaluate pumping stability.

In order to obtain the above findings, the inventor specifically conducted the following tests. Table 1 shows the results.
First, powder samples 1 to 4 having bulk densities shown in Table 1 above were prepared. Sample 1 used a setting modifier (mainly aluminum sulfonate), sample 2 ordinary cement, sample 3 hollow microspheres, and sample 4 silica fume.

Subsequently, the degree of agglomeration (%) of powder samples 1 to 4 was determined based on the following procedures (1) to (4).

(1) Using powder samples 1 to 4 (powder raw materials), the loose bulk density A and the hard bulk density P are obtained as follows, and using A and P, formula I: (A + P) /2 to obtain the average bulk density.
First, powder sample 1 was passed through a sieve with an opening of 710 μm to obtain a sample for measurement. The obtained sample for measurement was filled in a 100 cc container so that it would be heaped in 20 to 30 seconds, and the heaped portion was scraped off with a horizontal spatula without tapping. Loose bulk density (g/cm ³ ) was measured.
Subsequently, the obtained sample for measurement was filled in a 100 cc container with a capping holder attached, tapped vertically 180 times, then removed the capping holder, and the heaped portion was scraped off with a horizontal spatula. After that, the bulk density (g/cm ³ ) of the evaluation sample in the container was measured.
When the height of the sample for evaluation fell to the top of the container during tapping, the sample for evaluation was added and tapping was performed again 180 times.

(2) A three-stage sieve corresponding to the average bulk density value obtained in (1) was selected based on the following criteria.
Three-stage sieve 1: When the average bulk density is 0.4 g/cm ³ or less, select an upper sieve with an opening of 350 μm, a middle sieve with an opening of 250 μm, and a lower sieve with an opening of 150 μm.
Three-stage sieve 2: When the average bulk density is more than 0.4 g / cm ³ and less than 0.9 g / cm ³ , select an upper sieve with an opening of 250 μm, a middle sieve with an opening of 150 μm, and a lower sieve with an opening of 75 μm. .
Three-stage sieve 3: When the average bulk density is 0.9 g/cm ³ or more, select an upper sieve with an opening of 150 μm, a middle sieve with an opening of 75 μm, and a lower sieve with an opening of 45 μm.
As shown in Table 1, powder sample 1 has a three-stage sieve 2, powder sample 2 has a three-stage sieve 3, powder sample 3 has a three-stage sieve 1, and powder sample 4 has a three-stage sieve 2. selected.

(3) Place 2 g of powder samples 1 to 4 on the upper sieve of the three sieves selected in (2), amplitude: 1 mm, vibration time T (Table 1) calculated as follows. , using a vibrating sieve device (Powder Tester TYPE PT-E manufactured by Hosokawa Micron Corporation) equipped with a three-stage comb.
Vibration time T (seconds) was calculated from Formula II: T=20+[(1.6−W)/0.016].
Dynamic bulk density W (g/cm ³ ) in Formula II is calculated from Formula III: W=(P−A)×C/100+A.
The degree of compression C (%) in Formula III is calculated from Formula IV: C=(P−A)/P]×100.

(4) After (3), the weights (g) of the powder samples 1 to 4 remaining on the upper, middle and lower sieves are measured and designated as X, Y and Z, respectively. Using the obtained X, Y, and Z, the cohesion degree (%) of the powder samples 1 to 4 was calculated from the following formula V. Table 1 shows the results.
Formula V: Cohesion % = [(X/2) x 100] + [(Y/2) x 100 x (3/5)] + [(Z/2) x 100 x (1/5)]

As described above, by adopting the calculated vibration time using the average bulk density and appropriately selecting three types of three-stage sieves according to it, it is possible to stably determine the aggregation degree.

As shown in FIG. 1, powder samples 1 to 4 having the degrees of cohesion shown in Table 1 were enclosed in a bag and subjected to suction pressure feeding from the bag using a nozzle for evaluation. As a result, powder samples 1 to 3 could be sucked and pumped to the end without any clogging in the pump or hose, but powder sample 4 was interrupted due to clogging in the pump. Indicated.

From the above test results, it was found that by using a powder raw material with a degree of agglomeration equal to or lower than the above upper limit, it is possible to suck and pump from inside the bag, and the stability of pumping can be improved.

The upper limit of the degree of cohesion of the raw powder material is 50% or less, preferably 40% or less, more preferably 30% or less. Thereby, pumping stability can be improved. On the other hand, the lower limit of the cohesion degree of the raw powder material is not particularly limited, but may be, for example, 1% or more, or 5% or more. As a result, it is possible to improve the transportability of the powder raw material, the kneadability with other components, and the like.

According to the present embodiment, it is possible to realize a method of manufacturing a cement material that enables suction and pumping of the powdery raw material, and improves work efficiency and working environment when the powdery raw material is conveyed.

The method for producing the cement material of this embodiment will be described in detail below.

FIG. 1 is a diagram schematically showing a method of sucking and pumping powder raw material 10 in bag 20 as an example of a cement material manufacturing method.

First, the cement material manufacturing method performs a preparation step.
In the preparation step, as shown in FIG. 1, a bag 20 containing the raw powder material 10 is prepared.

The powder raw material 10 is not particularly limited as long as it is a powder containing at least part of the components constituting the cement material. Powder raw material 10 may contain one or more components.

An example of powder raw material 10 may include hollow microspheres. As the powder raw material 10, in addition to hollow microspheres, various components used in cement materials such as admixtures such as cement powder, lime powder, expansive agents, rapid setting agents, rapid hardening agents, and setting adjusting agents. powders are included. These may be used alone or in combination of two or more.

The lower limit of the average particle diameter _D50 of the raw material powder 10 is, for example, 10 μm or more, preferably 30 μm or more, and more preferably 50 μm or more. The upper limit of the average particle diameter _D50 of the raw material powder 10 is, for example, 500 μm or less, preferably 110 μm or less, and more preferably 90 μm or less.

The average particle diameter _D50 means the particle diameter at which the cumulative value is 50% in the volume frequency particle size distribution measured by the laser diffraction scattering method.

The lower limit of the bulk density of the raw material powder 10 is, for example, 0.05 g/cm ³ or more, preferably 0.08 g/cm ³ μm or more, more preferably 0.08 g/cm ³ μm or more. The upper limit of the bulk density of the raw material powder 10 is, for example, 2.0 g/cm ³ or less, preferably 1.9 g/cm ³ or less, more preferably 1.8 g/cm ³ or less.

Hollow microspheres may be configured to include organic and/or inorganic materials. These may be used alone or in combination of two or more. Resin etc. are mentioned as an organic material. Examples of inorganic materials include calcium carbonate and cement.

Hollow microspheres are lightweight fillers having a hollow structure, and may be used in the fields of civil engineering, construction, automobiles, and the like. Hollow microspheres may have elasticity and heat insulation, and for example, have freeze-thaw resistance such as obtaining hardened cement bodies with excellent durability such as freeze-thaw resistance in cold regions. may be

The resin in the hollow microspheres may specifically include acrylonitrile, acrylate, methacrylate, phenol, polymethyl methacrylate, methacrylonitrile, polystyrene, vinylidene chloride, vinyl acetate, and polyphenol. Polymers such as copolymers and crosslinked products thereof may also be included. These may be used alone or in combination of two or more.

Alternatively, the hollow microspheres may be composed of a polymeric spherical elastic body.
Hollow microspheres may be constructed of either a high water content type or a low water content type.
High water content type hollow microspheres have, for example, a water content of 85% or more. As a result, the stability against fire or the like can be enhanced.

Low water content type hollow microspheres can improve productivity and storage.
The water content of the low water content type hollow microspheres is, for example, 0.5 to 10%, preferably 0.5 to 5%. Scattering can be prevented by setting the above lower limit. When the amount is equal to or less than the above upper limit, when mixed with other components such as cement, deterioration of hardenability of cement can be suppressed, and deterioration of dispersibility in the mixture can be suppressed.

Powder raw material 10 may be configured to include organic and inorganic materials.
An example of this hollow microsphere may have an inorganic layer made of an inorganic material containing at least one of calcium carbonate and cement on the surface of a resin core particle made of an organic material containing a resin. The inorganic layer may be formed so as to cover part or all of the surface of the resin core particles. Thereby, scattering of the raw material powder 10 can be suppressed. Also, a cement material with less material separation is obtained.

The above-mentioned hollow microspheres can be obtained, for example, by heating resin-made hollow microspheres containing liquid hydrocarbon together with finely powdered calcium carbonate and cement to about 170°C.

The content of calcium carbonate in the hollow microspheres is, for example, preferably 100 to 800 parts, more preferably 200 to 800 parts, per 100 parts of the resin in the hollow microspheres.
The cement content in the hollow microspheres is, for example, preferably 100 to 900 parts, more preferably 200 to 900 parts, per 100 parts of the resin in the hollow microspheres.
When calcium carbonate and cement are used together, the total content of calcium carbonate and cement in the hollow microspheres is preferably, for example, 200 to 850 parts in total of calcium carbonate and cement with respect to 100 parts of the resin of the hollow microspheres. .

Various Portland cements, mixed cements, alumina cements, and white cements can be used as the cement in the hollow microspheres. Gypsum may be included in this cement. Anhydrous gypsum is preferable as the gypsum because it does not impair fluidity when wet.

The bag 20 is a bag that contains the raw material powder 10 and seals the inside.

The material of the bag 20 is not particularly limited, but materials commonly used in the field of cement may be used. This bag 20 does not have to be water-soluble.

An example of the bag 20 may be made of kraft paper, resin film, or the like.
As a specific bag 20, for example, a kraft paper bag composed of one or more layers of kraft paper, a kraft paper bag containing a resin film in which a resin film is arranged between the kraft papers, and the innermost layer of these is laminated. A laminated paper bag made of a resin film, a resin film bag made of one or two or more resin films, and the like.
Among these, an example of the bag 20 may have a resin film composed of a single layer or multiple layers.

Examples of the resin material include PE (polyethylene) such as LDPE (low density polyethylene), PET (polyethylene terephthalate), PVC (polyvinyl chloride), PC (polycarbonate), and PP (polypropylene). These may be used alone or in combination of two or more.

The innermost layer of the bag 20 may be subjected to surface treatment such as antistatic treatment.
The valve opening of the bag 20 for introducing the raw material powder 10 may be heat-sealed or sealed with an adhesive.
The bag 20 may have transparency to the extent that the amount of the raw material powder 10 contained therein can be visually observed.

The thickness of the bag 20 can be determined as appropriate, and may be, for example, 0.1 mm to 3 mm, 0.2 mm to 2 mm, or 0.3 mm to 1 mm. The easiness of piercing can be improved by making it equal to or less than the above upper limit. On the other hand, by making it equal to or higher than the above lower limit, the storage stability of the raw material powder 10 can be improved.
The lower limit of tear propagation resistance of the bag 20 is, for example, 1 g or more, preferably 50 g or more, and more preferably 100 g or more. Thereby, breakage of the bag 20 can be suppressed. The upper limit of the tear propagation resistance of the bag 20 may be, for example, 400 g or less. This makes it easier to pierce the bag 20 .

The lower limit of the tensile strength of the bag 20 is, for example, 50 MPa or higher, preferably 200 MPa or higher, and more preferably 700 MPa or higher. The upper limit of the tensile strength of the bag 20 is, for example, 2500 MPa or less. By setting it within such a range, it is possible to achieve a balance between the mechanical strength of the bag 20 and the easiness of penetration by the nozzle.

In the preparation process, the bag 20 containing the raw material powder 10 may be held in a state of being left still on a flat table, or may be held in a state of being suspended.

The shape of the bag 20 containing the raw material powder 10 when left standing on a flat surface is not particularly limited, but may be, for example, a substantially rectangular parallelepiped shape or a substantially cylindrical shape. By placing the bag 20 on a flat surface, the next pumping process can be performed while the position and shape of the bag 20 are stabilized.

In the present specification, the term "substantially" means that it includes a range that takes into account manufacturing tolerances, variations, and the like, unless otherwise explicitly stated.

The bag 20 in the suspended state may be configured such that a portion of the lower portion 22 expands, for example, both ends of the lower portion of the bag 20 expand outward and the central portion of the lower portion is configured to dent inward. may

As a hanging method, there is a method of attaching the bag 20 to an attachment jig 92 as shown in FIG. The bag 20 is fixed to the mounting jig 92 by a known fixing means. Examples of fixing means include strings and hooks.

Since the lower part of the suspended bag 20 is held at a position away from the ground, it becomes easier to insert the nozzle 30 from the lower part 22 of the bag 20 in the next pumping process.

Subsequently, the cement material manufacturing method performs a pumping step.

In the pumping process, the nozzle 30 suction process is performed after the nozzle 30 insertion process.
The piercing step of the nozzle 30 may pierce the bag 20 inside the bag 20 , and may pierce any of the top, side, and bottom 22 of the bag 20 .

A method for inserting the nozzle 30 is not particularly limited.
For example, a part of the bag 20 may be cut by a predetermined cutting means, and then the nozzle 30 may be inserted into the cut. Also, by pressing the nozzle 30 with the tip of the nozzle 30 in contact with the surface of the bag 20 , the bag 20 can be broken through and entered into the bag 20 .

When piercing the bag 20 with the tip of the nozzle 30, the nozzle 30 preferably has a truncated conical tip 50 whose diameter gradually decreases toward the tip. As a result, while the tip portion 50 is pierced into the bag 20, it is possible to prevent the raw material powder 10 from leaking out from the periphery of the piercing. Also, the spear-like tip 50 enhances the ease of piercing.

Moreover, the tip of the tip portion 50 may be configured in a substantially hemispherical shape. By appropriately reducing the radius of the tip of the tip portion 50, the ease of piercing can be enhanced.

The nozzle 30 inserted into the bag 20 may be fixed to the bag 20. - 特許庁For example, the tip 50 of the nozzle 30 and part of the bag 20 may be fixed with the attachment 90 . The attachment 90 may be a jig that has a tubular shape and that can prevent the raw material powder 10 from leaking out when the tip portion 50 is stuck into the bag 20 .

In FIG. 1, the nozzle 30 is inserted into the lower part 22 of the suspended bag 20, and the bag 20 and the nozzle 30 are fixed by the attachment 90. As shown in FIG. In this state, the next suction step is performed. Since the raw material powder 10 gathers toward the lower portion 22 of the bag 20, the suction efficiency can be enhanced. In addition, since it is fixed by the attachment 90, it is possible to suppress leakage of the raw material powder 10 even during suction.

The nozzle 30 has at least a suction port 56 for sucking the raw material powder 10 . The raw material powder 10 is sucked from the suction port 56 by the negative pressure generated by the operation of the pump 70 . The sucked raw material powder 10 is pressure-fed into the container 40 through a pipe 60 connected to the nozzle 30 .

Nozzle 30 may comprise a dual tube nozzle having an inner tube 54 and an outer tube 52, as shown in FIG. At the distal end portion 50 of the double-tube nozzle, a blowout port 58 for blowing out air is provided so as to penetrate the outer tube 52 and the inner tube 54, and the outer tube 52 is penetrated but not the inner tube 54. A suction port 56 for sucking the powder raw material 10 is provided.

The powder raw material 10 in the bag 20 is pumped into the container 40 from the suction port 56 through the pipe 60 between the outer tube 52 and the inner tube 54 by the negative pressure generated by the operation of the pump 70. be done. The interior of pipe 60 from tip 50 to pump 70 may be in a vacuum state.

A plurality of suction ports 56 may be provided in the distal end portion 50 . Moreover, the shape of the suction port 56 is not particularly limited, but may be formed in a slit shape. Thereby, the suction efficiency can be enhanced.

The air blown out from the blowout port 58 is introduced into the bag 20 via the pipe 62 by the positive pressure generated by the operation of the pump 72 through the inner pipe 54 connected to the pipe 62 . The air from the blowout port 58 can perform aeration for fluidizing the raw material powder 10 in the bag 20 . This makes it possible to further improve the suction efficiency.

The blowout port 58 is preferably arranged on the distal end side of the distal end portion 50 relative to the suction port 56 . Thereby, aeration can be performed without inhibiting suction. Although the shape of the outlet 58 is not particularly limited, it may be configured in a round shape. As a result, the air can be released to the entire circumference of the distal end portion 50, and the effect of aeration can be enhanced.

As an example of the pipe 60 and the pipe 62, a hose made of resin or metal can be used.
As an example of the pump 70, a pump such as a diaphragm can be used.
As an example of the pump 72, a pump such as a compressor can be used.

Thereafter, the cement material is obtained by mixing the pumped raw powder material 10 and other components in the container 40 .

An example of other components is concrete 80 .
That is, the pumping step may include a step of storing the concrete 80 in advance in the container 40 before the pumping, and a step of mixing the pumped powder raw material 10 and the concrete 80 in the container 40. good.

In this embodiment, the concrete 80 is a general term for cement paste, cement mortar, and cement concrete.

The container 40 may be an agitating mixer installed indoors or a mixing drum of a mixer truck capable of carrying and mixing concrete.

The powder raw material 10 pumped into the mixing drum is mixed with other components such as concrete 80 by a mixer to form a cement material. In this way, the pumping process can be performed at the concrete construction site. Therefore, the cement material manufacturing method of the present embodiment is excellent in handleability even in the field.

The cement used for concrete is not particularly limited, and various Portland cements such as normal, high early strength, super early strength, low heat, and moderate heat, these Portland cements, blast furnace slag, fly ash, silica, or Examples include various mixed cements mixed with limestone fine powder and the like, and waste-utilizing cements, so-called eco-cements. These may be used alone or in combination of two or more.

In addition, in various applications, as other ingredients, if necessary, as long as the purpose is not hindered, aggregates, swelling agents, shrinkage reducing agents, pozzolanic substances such as fly ash and silica fume, rust inhibitors, methyl cellulose, etc. Insoluble admixtures, thickeners, water retention agents, waterproof agents, foaming agents, antifreeze agents, subsidence inhibitors, antibacterial agents, coloring agents, and the like can be used in combination. These may be used alone or in combination of two or more.

The cement material obtained as described above can be used for various construction works.

Although the embodiments of the present invention have been described above, these are examples of the present invention, and various configurations other than those described above can be adopted. Moreover, the present invention is not limited to the above-described embodiments, and includes modifications, improvements, etc. within the scope of achieving the object of the present invention.
Examples of reference forms are added below.
1. A preparation step of preparing a bag containing a powder raw material with a cohesion degree of 50% or less obtained by the following procedure;
a pumping step of sucking the powdery raw material from the nozzle in a state in which the nozzle is inserted into the bag and pumping the powdery raw material into a container through a pipe connected to the nozzle;
A method of manufacturing a cementitious material, comprising:
(procedure)
(1) Using the powder raw material, the loose bulk density A and the hard bulk density P are obtained as follows, and using A and P, the average bulk density is calculated from the formula I: (A + P) / 2. demand.
First, the raw material powder is passed through a sieve with an opening of 710 μm to obtain a sample for measurement. The obtained sample for measurement is filled in a 100 cc container and ground without tapping, and then the loose bulk density (g/cm 3 ) of the sample for evaluation in the container is ^measured . Subsequently, the obtained measurement sample is filled in a 100 cc container, tapped 180 times in the vertical direction, and ground, and then the hard bulk density (g / cm ³ ) is measured.
(2) Three sieves corresponding to the average bulk density value obtained in (1) are selected based on the following criteria.
If the average bulk density is 0.4 g/cm ³ or less, select an upper sieve with an opening of 350 μm, a middle sieve with an opening of 250 μm, and a lower sieve with an opening of 150 μm, and the average bulk density exceeds 0.4 g/cm ³ 0 If the average bulk density is less than 9 g /cm ³ , select an upper sieve with an opening of 250 μm, a middle sieve with an opening of 150 μm, and a lower sieve with an opening of 75 μm ^. An upper sieve with an opening of 75 μm, a middle sieve with an opening of 45 μm, and a lower sieve with an opening of 45 μm are selected.
(3) Place 2 g of the powder raw material on the upper sieve of the three-stage sieve selected in (2), and vibrate the three-stage comb under the conditions of an amplitude of 1 mm and a vibration time T calculated as follows. Shake using a vibrating sieve device with
The vibration time T (seconds) is calculated from Equation II: T=20+[(1.6−W)/0.016].
The dynamic bulk density W (g/cm ³ ) in Formula II is calculated from Formula III: W=(P−A)×C/100+A.
The degree of compression C (%) in Formula III is calculated from Formula IV: C=(P−A)/P]×100.
(4) After (3), the weight (g) of the powder raw material remaining on the upper, middle and lower sieves is measured and defined as X, Y and Z, respectively. Using the obtained X, Y, and Z, the cohesion degree (%) of the raw material powder is calculated from the following formula V.
Formula V: Cohesion % = [(X/2) x 100] + [(Y/2) x 100 x (3/5)] + [(Z/2) x 100 x (1/5)]
2. 1. A method for producing a cement material according to
A method for producing a cement material, wherein the powder raw material contains hollow microspheres.
3. 2. A method for producing a cement material according to
A method for producing a cement material, wherein the hollow microspheres contain an organic material and an inorganic material.
4. 1. ~3. A method for producing a cement material according to any one of
A method for producing a cement material , wherein the powder raw material has an average particle diameter D50 of 10 μm or more and 500 μm or less _.
5. 1. ~ 4. A method for producing a cement material according to any one of
A method for producing a cement material , wherein the bulk density of the powder raw material is 0.05 g/cm ³ or more and 2.0 g/cm ³ or less.
6. 1. ~ 5. A method for producing a cement material according to any one of
A method for producing a cement material, wherein the nozzle has a truncated cone-shaped tip that gradually decreases in diameter toward the tip.
7. 6. A method for producing a cement material according to
The nozzle is composed of a double tube nozzle,
The tip of the double tube nozzle is
an air outlet for blowing air;
a slit-shaped suction port for sucking the powder raw material,
A method for producing a cement material.
8. 1. ~7. A method for producing a cement material according to any one of
A method for producing a cement material, wherein the nozzle is inserted under the suspended bag, and the pumping step is performed in a state in which the bag and the nozzle are fixed with an attachment.
9. 1. ~8. A method for producing a cement material according to any one of
A method for producing a cement material, wherein the bag comprises a single layer or multiple layers of resin film.
10. 1. ~ 9. A method for producing a cement material according to any one of
A method for producing a cement material, wherein the bag has a tear propagation resistance of 1 g or more and 400 g or less.
11. 1. ~ 10. A method for producing a cement material according to any one of
A method for producing a cement material, wherein the bag has a tensile strength of 50 MPa or more and 2500 MPa or less.
12. 1. ~ 11. A method for producing a cement material according to any one of
The pumping step includes:
Pre-housing concrete inside the container prior to pumping;
and mixing the pumped raw material powder and the concrete in the container.
13. 12. A method for producing a cement material according to
A method for producing a cement material, wherein the pumping step is performed at a construction site of the concrete.

10 powder raw material 20 bag 22 lower part 30 nozzle 40 container 50 tip 52 outer pipe 54 inner pipe 56 suction port 58 outlet 60 pipe 62 pipe 70 pump 72 pump 80 concrete 90 attachment 92 mounting jig

Claims (13)

A preparation step of preparing a bag for containing the powder raw material;
a pumping step of sucking the powdery raw material from the nozzle in a state in which the nozzle is inserted into the bag, and pumping the powdery raw material into a container through a pipe connected to the nozzle. Mi ,
The degree of agglomeration of the powder raw material contained in the bag, which is obtained by the following procedure, is 50% or less,
A method for producing a cement material.
(procedure)
(1) Using the powder raw material, the loose bulk density A and the hard bulk density P are obtained as follows, and using A and P, the average bulk density is calculated from the formula I: (A + P) / 2. demand.
First, the raw material powder is passed through a sieve with an opening of 710 μm to obtain a sample for measurement. The obtained sample for measurement is filled in a 100 cc container and ground without tapping, and then the loose bulk density (g/cm ³ ) of the sample for evaluation in the container is measured. Subsequently, the obtained measurement sample is filled in a 100 cc container, tapped 180 times in the vertical direction, and ground, and then the hard bulk density (g / cm ³ ) is measured.
(2) Three sieves corresponding to the average bulk density value obtained in (1) are selected based on the following criteria.
If the average bulk density is 0.4 g/cm ³ or less, select an upper sieve with an opening of 350 μm, a middle sieve with an opening of 250 μm, and a lower sieve with an opening of 150 μm, and the average bulk density exceeds 0.4 g/cm ³ 0 If the average bulk density is less than 9 g/cm ³ , select an upper sieve with an opening of 250 μm, a middle sieve with an opening of 150 μm, and a lower sieve with an opening of 75 μm ^. An upper sieve with an opening of 75 μm, a middle sieve with an opening of 45 μm, and a lower sieve with an opening of 45 μm are selected.
(3) Place 2 g of the powder raw material on the upper sieve of the three-stage sieve selected in (2), and vibrate the three-stage comb under the conditions of an amplitude of 1 mm and a vibration time T calculated as follows. Shake using a vibrating sieve device with
The vibration time T (seconds) is calculated from Equation II: T=20+[(1.6−W)/0.016].
The dynamic bulk density W (g/cm ³ ) in Formula II is calculated from Formula III: W=(P−A)×C/100+A.
The degree of compression C (%) in Formula III is calculated from Formula IV: C=(P−A)/P]×100.
(4) After (3), the weight (g) of the powder raw material remaining on the upper, middle and lower sieves is measured and defined as X, Y and Z, respectively. Using the obtained X, Y, and Z, the cohesion degree (%) of the raw material powder is calculated from the following formula V.
Formula V: Cohesion % = [(X/2) x 100] + [(Y/2) x 100 x (3/5)] + [(Z/2) x 100 x (1/5)] A method for producing a cement material according to claim 1,
A method for producing a cement material, wherein the powder raw material contains hollow microspheres. A method for producing a cement material according to claim 2,
A method for producing a cement material, wherein the hollow microspheres contain an organic material and an inorganic material. A method for producing a cement material according to any one of claims 1 to 3,
A method for producing a cement material, wherein the powder raw material has an average particle diameter _D50 of 10 μm or more and 500 μm or less. A method for producing a cement material according to any one of claims 1 to 4,
A method for producing a cement material, wherein the bulk density of the powder raw material is 0.05 g/cm ³ or more and 2.0 g/cm ³ or less. A method for producing a cement material according to any one of claims 1 to 5,
A method for producing a cement material, wherein the nozzle has a truncated cone-shaped tip that gradually decreases in diameter toward the tip. A method for producing a cement material according to claim 6,
The nozzle is composed of a double tube nozzle,
The tip of the double tube nozzle is
an air outlet for blowing air;
a slit-shaped suction port for sucking the powder raw material,
A method for producing a cement material. A method for producing a cement material according to any one of claims 1 to 7,
A method for producing a cement material, wherein the nozzle is inserted under the suspended bag, and the pumping step is performed in a state in which the bag and the nozzle are fixed with an attachment. A method for producing a cement material according to any one of claims 1 to 8,
A method for producing a cement material, wherein the bag comprises a single layer or multiple layers of resin film. A method for producing a cement material according to any one of claims 1 to 9,
A method for producing a cement material, wherein the bag has a tear propagation resistance of 1 g or more and 400 g or less. A method for producing a cement material according to any one of claims 1 to 10,
A method for producing a cement material, wherein the bag has a tensile strength of 50 MPa or more and 2500 MPa or less. A method for producing a cement material according to any one of claims 1 to 11,
The pumping step includes:
Pre-housing concrete inside the container prior to pumping;
and mixing the pumped raw material powder and the concrete in the container. A method for producing a cement material according to claim 12,
A method for producing a cement material, wherein the pumping step is performed at a construction site of the concrete.

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