JP6171377B2 - Construction method for concrete structures - Google Patents

Description

  The present invention is a construction for filling a void portion, which is a gap between the structure and the window frame or piping when the window frame or piping is fitted into the concrete structure, with mortar, and finishing the surface with a flaw Regarding the method.

  Patent Document 1 discloses a premix mortar for filling a window frame gap made of cement, fine aggregate, inorganic lightweight aggregate, foamed resin lightweight aggregate, and re-emulsified powder resin. It is disclosed that it is lighter and has a lower plastic viscosity, higher yield value, better workability, workability, and fillability, less cracking and poor adhesion to the fuselage, and excellent heat insulation and waterproof properties. ing.

  Regarding lightweight cement-based mortar suitable for plastering, Patent Document 2 discloses inorganic lightweight aggregates with a particle size of 2.1 mm or less, organic lightweight aggregates with a particle size of 2 mm or more, re-emulsified powder resin, water retention agent Further, a plastering cement mortar containing glass fiber and having a unit volume mass of 1.1 to 1.4 kg / L is disclosed, and it is disclosed that strength and deformation followability are high and cracking is difficult to occur.

  In addition, regarding mortar for iron coating such as tile base material, plastering material, wall material, mortar for spraying, and cement composition that can be used for tile base adjustment and repair of structures, Patent Document 3 A premix powder containing Portland cement, fine aggregate, acrylic copolymer re-emulsifying resin powder, lightweight aggregate, setting retarder, thickener is disclosed and has good workability and sprayability, water It is disclosed that the amount of curing shrinkage of the hard mortar cured body is small.

  Patent Document 4 discloses a lightweight mortar containing cement, a resin foam having a unit volume mass of 0.1 kg / L or less, and an inorganic lightweight aggregate having a unit volume mass of 0.6 kg / L or less and a water absorption of 10 mass% or less. It is disclosed that kneading water can be reduced by using an inorganic lightweight aggregate that is excellent in heat insulation, hardly causes false condensation, and has a low water absorption rate.

JP 2005-53717 A JP 2009-96657 A JP 2011-190141 A JP 2012-131657 A

  However, although the filling property and dredging workability can be adjusted by reducing the weight of the mortar and adjusting the viscosity, the strength characteristics generally tend to decrease when the mortar is lightened. Construction of a concrete structure using a cement composition with good strength characteristics and adhesiveness to integrate a concrete structure with a window frame or piping, etc. while having good surface quality and excellent surface accuracy There is a need for a method.

  Therefore, the present invention provides a method for constructing a concrete structure using a cement composition capable of obtaining a mortar composition having a good unit volume mass, good filling property and dredging workability, and excellent surface accuracy. The purpose is to do. Furthermore, a method for constructing a concrete structure using a cement composition capable of forming a mortar hardened body having good strength characteristics and adhesiveness for integrating the concrete structure with a window frame or piping is provided. The purpose is to do.

  As a result of diligent studies to achieve the above object, the present inventors include Portland cement, fine aggregate, lightweight aggregate, fly ash fine powder, cellulosic thickener, and material separation reducing agent. Is a pulverized polystyrene foam and pearlite aggregate, fly ash fine powder has a specific range of Blaine specific surface area, and the material separation reducing agent is a polymer synthetic copolymer. In addition to having good unit volume mass, good filling property and dredging workability, and excellent surface accuracy, it also has good strength characteristics and adhesiveness for integrating a concrete structure with a window frame or piping, etc. The headline and the present invention were completed.

That is, the present invention is a method for constructing a concrete structure in which a window frame or piping is fitted into the concrete structure, and a mortar preparation step of preparing a mortar composition by mixing and kneading a cement composition and water. And a mortar suction step for sucking the mortar composition into the mortar filler, and a mortar filling step for filling the gap portion between the concrete structure and the window frame or piping with the mortar composition sucked into the mortar filler. And a mortar finishing step for finishing the surface portion exposed to the outside of the mortar composition filled in the void portion with a broom and a cured body forming step for curing the wrinkled mortar composition to form a mortar cured body. And the cement composition comprises Portland cement, fine aggregate, lightweight aggregate, fly ash fine powder, cellulosic thickener and material. Includes a segregation reducing agent, lightweight aggregate is a polystyrene foam pulverized and perlite aggregate, Blaine specific surface area of the powder fly ash fines are 2,500~9,000cm ² / g, the high material separation reducing agent A method for constructing a concrete structure which is a molecular synthetic copolymer is provided.

  Since the concrete structure construction method of the present invention uses a cement composition containing a specific component for the construction of a concrete structure, it has a good unit volume mass, good filling property and dredging workability, and an excellent surface. A mortar composition having accuracy can be obtained, and a mortar hardened body having good strength characteristics and adhesiveness for integrating a concrete structure with a window frame or piping can be formed. As described above, in the method for constructing a concrete structure of the present invention, the reason why the mortar cured body has good strength properties and adhesiveness while having a good unit volume mass is not necessarily clear, but one of the reasons. The present inventors consider that the components contained in the cement composition interact with each other to contribute to the improvement of strength characteristics and adhesiveness.

  Preferred embodiments [(1) to (5)] of the concrete structure construction method of the present invention are shown below. In the present invention, it is more preferable to appropriately combine these aspects.

  (1) As for the fine aggregate of the cement composition used for the construction method of the concrete structure of this invention, the mass ratio of the particle | grains whose particle diameter is 0.15 mm or more and less than 0.3 mm is 30-70 mass%. The mass ratio of particles having a particle diameter of 0.075 mm or more and less than 0.15 mm is preferably 30 to 70 mass%. Thereby, the mortar hardening body which has a favorable intensity | strength characteristic and adhesiveness can be obtained. Moreover, workability can be improved more.

(2) The cement composition used in the method for constructing a concrete structure of the present invention has a bulk density of styrene pulverized product of 0.005 to 0.050 g / cm ³ , a particle diameter of 1.18 mm or more, and The mass ratio of particles less than 2.0 mm is 10 to 30 mass% or less, the particle diameter is 0.6 mm or more and the mass ratio of particles less than 1.18 mm is 30 to 70 mass%, particles The mass ratio of particles having a diameter of 0.3 mm or more and less than 0.6 mm is preferably 20 to 40% by mass. Thereby, the mortar composition which has favorable unit volume mass and favorable workability can be obtained.

(3) The cement composition used in the method for constructing a concrete structure of the present invention has a bulk density of pearlite aggregate of 0.050 to 0.250 g / cm ³ , a particle diameter of 0.6 mm or more, and 1. The mass ratio of particles less than 1.18 mm is 5 to 35 mass% or less, the particle diameter is 0.3 mm or more and the mass ratio of particles less than 0.6 mm is 30 to 60 mass%, particles The mass ratio of particles having a diameter of 0.15 mm or more and less than 0.3 mm is preferably 10 to 40% by mass. Thereby, the mortar composition which has favorable unit volume mass and favorable workability can be obtained. Furthermore, a mortar cured body having good strength characteristics and adhesiveness can be obtained.

  (4) The cement composition used for the construction method of the concrete structure of the present invention is 75 to 175 parts by mass of fine aggregate and 0.50 to 1.00 parts by mass of pulverized polystyrene foam with respect to 100 parts by mass of Portland cement. 3 to 30 parts by weight of pearlite aggregate, 30 to 90 parts by weight of fine fly ash powder, 0.01 to 0.20 parts by weight of a cellulosic thickener, and 0.01 to 0.15 parts by weight of a material separation reducing agent. Is preferred. Thereby, the mortar composition which has favorable unit volume mass, favorable dredging workability | operativity, a filling property, and the outstanding surface precision can be obtained. Furthermore, the hardened | cured mortar body which has the better intensity | strength characteristic and adhesiveness for integrating with a concrete structure can be obtained, and durability of the concrete structure after construction can be improved more.

  (5) It is preferable that the cement composition used for the construction method of the concrete structure of the present invention further includes a linear saturated fatty acid metal salt, and the saturated fatty acid metal salt has 12 to 24 carbon atoms. This makes it possible to obtain a hardened mortar that has good strength characteristics and adhesion to integrate with a concrete structure while having good workability, improving the durability of the concrete structure after construction. can do.

  ADVANTAGE OF THE INVENTION According to this invention, while being able to provide the construction method of the concrete structure from which the mortar composition which has a favorable unit volume mass, the favorable filling property, dredging workability | operativity, and the outstanding surface precision can be provided, a concrete structure It is possible to provide a method for constructing a concrete structure capable of forming a mortar hardened body having good strength characteristics and adhesiveness for integrating a window frame or a pipe and the like.

  A preferred embodiment of a concrete structure construction method according to the present invention will be described below. The concrete structure construction method according to the present embodiment is a concrete structure construction method in which a window frame or piping is fitted into the concrete structure. The mortar composition is obtained by mixing and kneading a cement composition and water. The mortar preparation process for preparing the mortar composition, the mortar suction process for sucking the mortar composition into the mortar filler, and the mortar composition sucked into the mortar filler into the gap portion between the concrete structure and the window frame or piping, etc. A mortar filling step for filling, a mortar finishing step for finishing the surface portion exposed to the outside of the mortar composition filled in the voids, and a cured body for curing the mortar finished mortar composition to form a mortar cured body Forming step. Details of each step will be described below.

  The mortar preparation step is a step of blending and kneading the cement composition and water at a predetermined ratio. For kneading, a plastering mortar mixer or a hand mixer can be suitably used. When preparing a mortar composition, the flow value and unit volume mass of a mortar composition can be adjusted by changing the compounding quantity of water suitably in a suitable range. Thus, the mortar composition suitable for a use can be prepared by changing the compounding quantity of water. Here, the flow value is a value measured in accordance with the test method described in JIS R 5201: 1997 “Cement physical test method”, and the unit volume mass is JIS A 1171: 2000 “polymer cement”. It is a value (unit: kg / L) measured based on the test method described in “Testing method of mortar”.

  The amount of water is preferably 20 to 36 parts by weight, more preferably 22 to 33 parts by weight, still more preferably 24 to 31 parts by weight, particularly preferably 100 parts by weight of the cement composition. 26 to 29 parts by mass.

  The flow value of the mortar composition obtained by the concrete structure construction method of the present embodiment is preferably 170 to 210 mm, more preferably 175 to 205 mm, still more preferably 180 to 200 mm, and particularly preferably. 185-195 mm.

  By setting the flow value within the above-described range, it is possible to obtain a mortar composition having good workability (good filling property and dredging workability) and finish (surface accuracy).

  The unit volume mass of the mortar composition obtained by the concrete structure construction method of the present embodiment is preferably 1.45 to 1.63 kg / L (L represents liter), and more preferably 1.48 to 1.60 kg / L, more preferably 1.50 to 1.58 kg / L, and particularly preferably 1.52 to 1.56 kg / L.

  By making unit volume mass into the above-mentioned range, it can be set as the mortar composition which has favorable workability (good filling property and dredging workability | operativity) and finish (surface accuracy).

  The mortar sucking step is a step of sucking the mortar composition described above into a mortar filler. As the mortar filling machine, for example, “Tsumaru” manufactured by Tomojo Construction Machinery Co., Ltd. can be mentioned. When the mortar composition is sucked using the mortar filler, the ratio of the volume of the mortar composition sucked into the filler in one stroke of the mortar filler with respect to the internal volume of the mortar filler is preferably 85.0%. More preferably, it is 88.0% or more, particularly preferably 90.0% or more.

  By setting the volume ratio of the mortar composition sucked in one stroke of the mortar filler as described above, a good filling property is obtained at the time of extruding the mortar composition from the mortar filler and filling the void portion, Moreover, since it is filled enough to every corner, the mortar hardened | cured material which has the better intensity | strength characteristic and adhesiveness for integrating a concrete structure, a window frame, piping, etc. can be obtained.

  The mortar filling step is a step of filling the void portion, which is a gap between the concrete structure and the window frame or piping, using the mortar filling device. At the time of work, it is preferable to insert the mortar filling device as deeply as possible into the gap portion so as to sufficiently fill from the back side to every corner. Here, when the void portion penetrates to the opposite surface on the filling side, it is possible to suitably perform a leak-proofing process step in which a backup material such as a contact plate is attached in advance so that the mortar composition does not leak from the opposite surface. it can. Moreover, the primer application | coating process which apply | coats the primer which is a water absorption regulator previously can be suitably performed as a surface treatment to the space | gap part of a concrete structure.

  The mortar finishing step is a step of finishing a smooth surface by pressing or leveling the surface portion exposed to the outside with a mortar composition filled in the void portion. In order to finish the surface of the mortar composition smoothly using wrinkles, it is preferable that wrinkle breakage, wrinkle feeding, wrinkle elongation, and wrinkle separation, which are indicators of wrinkle workability, are generally good.

  A hardening body formation process is a process of curing and hardening the above-mentioned mortar composition, and forming a mortar hardening body. The mortar hardened body obtained by the concrete structure construction method of the present embodiment has good strength characteristics and adhesiveness for integrating the concrete structure and the window frame or piping.

Flexural strength at the age of 28 days the mortar cured body obtained by the construction method of the concrete structure of the present embodiment is preferably 4.0 N / mm ² or more, more preferably at 4.1N / mm ² or more , still more preferably 4.3 N / mm ² or more, and particularly preferably 4.4 N / mm ² or more.

The compression strength of the cured mortar obtained by the concrete structure construction method of the present embodiment on the 28th day of the age is preferably 18.0 N / mm ² or more, more preferably 18.5 N / mm ² or more. More preferably, it is 19.0 N / mm ² or more, and particularly preferably 19.5 N / mm ² or more.

  When the bending strength and the compressive strength are equal to or higher than the above values, the mortar cured body has good strength characteristics for integrating the concrete structure with the window frame or the pipe.

The adhesive strength at the age of 28 days the mortar cured body obtained by the construction method of the concrete structure of the present embodiment is preferably 1.5 N / mm ² or more, more preferably be 1.8 N / mm ² or more , still more preferably 2.0 N / mm ² or more, and particularly preferably 2.2 N / mm ² or more.

  When the adhesive strength is equal to or higher than the above value, the mortar cured body has good adhesiveness for integrating the concrete structure and the window frame or piping.

  The mortar hardened body obtained by the concrete structure construction method of the present embodiment has good strength characteristics and adhesiveness for integrating the concrete structure and the window frame or piping.

<Cement composition>
A preferred embodiment of a cement composition used in the method for constructing a concrete structure of the present invention will be described below. The cement composition is a cement composition containing Portland cement, a cellulosic thickener, a material separation reducing agent, a lightweight aggregate, a fine aggregate, and a fine fly ash powder.

  Hereafter, each component contained in the cement composition used for the construction method of the concrete structure of this embodiment is demonstrated in detail.

  Portland cement is a common hydraulic material, and any commercially available product can be used. Among these, it is preferable to use Portland cement specified by JIS R 5210: 2009 “Portland cement”.

  The fine aggregate does not contain particles having a particle diameter of 0.3 mm or more, and the mass ratio of particles having a particle diameter of 0.15 mm or more and less than 0.3 mm to the whole fine aggregate is preferably 30. It is -70 mass%, More preferably, it is 40-60 mass%, More preferably, it is 45-55 mass%.

  Moreover, while satisfying the above-described mass ratio, the mass ratio of the particles having a particle diameter of 0.075 mm or more and less than 0.15 mm with respect to the entire fine aggregate is preferably 30 to 70 mass%, More preferably, it is 40-60 mass%, More preferably, it is 45-55 mass%.

  In addition, while satisfying the above-described mass ratio, the mass ratio of particles having a particle diameter of less than 0.075 mm with respect to the entire fine aggregate is preferably 10 mass%, more preferably 5 mass% or less. More preferably, it is 3% by mass or less.

  When the particle diameter of the fine aggregate is within the above-described range, a cured mortar having good strength characteristics and adhesiveness can be obtained. Moreover, the mortar composition which has favorable workability can be obtained.

  The particle diameter of the fine aggregate can be measured by using several sieves having different nominal sizes as defined in JIS Z8801-1: 2006 “Test sieve—Part 1: Metal mesh sieve”. In the present specification, “the mass ratio of particles having a particle diameter of 0.15 mm or more and less than 0.3 mm” means that when a sieve having a sieve size of 0.3 mm is used, a sieve having a sieve size of 0.3 mm is used. When a sieve having a sieve mesh of 0.15 mm is used, it means the mass ratio of particles remaining on the sieve having a sieve mesh of 0.15 mm to the whole fine aggregate.

  As such fine aggregates, those selected from sands such as quartz sand, river sand, land sand, sea sand and crushed sand can be suitably used.

  The content of fine aggregate in the cement composition used in the method for constructing a concrete structure of the present embodiment is preferably 75 to 175 parts by mass, more preferably 85 to 155 parts by mass with respect to 100 parts by mass of Portland cement. Part, more preferably 95 to 140 parts by weight, and particularly preferably 100 to 130 parts by weight.

  By setting the content of fine aggregate in the cement composition within the above range, it is possible to obtain a mortar composition having good workability, and to integrate a concrete structure with a window frame or piping, etc. A mortar cured body having good strength characteristics and adhesiveness can be obtained.

  Lightweight aggregates are styrofoam ground material and perlite aggregate. When the cement composition contains lightweight aggregate, the mortar composition is reduced in weight, a good unit volume mass is obtained, workability is improved in dredging and filling operations, and the surface accuracy and filling efficiency of the finished surface are improved. Improved.

  The styrene foam pulverized product is obtained by pulverizing a foamed styrene resin or a foamed styrene resin waste material with a pulverizer and classifying it with a vibration sieve or the like.

The bulk density (g / cm ³ ) of the styrene foam pulverized product is preferably 0.005 to 0.050, more preferably 0.010 to 0.040, and still more preferably 0.015 to 0.035. Yes, particularly preferably 0.020 to 0.030.

  By setting the bulk density of the styrene foam pulverized product within the above range, a mortar composition having good unit volume mass and good workability can be obtained.

  The styrene foam pulverized product does not contain particles having a particle diameter of 2.00 mm or more, and the mass ratio of particles having a particle diameter of 1.18 mm or more and less than 2.00 mm is preferably 10 with respect to the entire styrene foam pulverized product. It is -30 mass%, More preferably, it is 12-25 mass%, More preferably, it is 15-20 mass%.

  In addition, while satisfying the above-described mass ratio, the mass ratio of the particles having a particle diameter of 0.6 mm or more and less than 1.18 mm is preferably 30 to 70 mass% with respect to the entire styrene foam pulverized product. More preferably, it is 40-60 mass%, More preferably, it is 45-55 mass%.

  Moreover, while satisfying the above-mentioned mass ratio, the mass ratio of the particles having a particle diameter of 0.3 mm or more and less than 0.6 mm, preferably 20 to 40 mass%, with respect to the entire styrene foam pulverized product, More preferably, it is 23-35 mass%, More preferably, it is 25-30 mass%.

  By setting the particle diameter of the styrene foam pulverized product within the range of the above mass ratio, it is possible to obtain a mortar cured body having better adhesiveness while having better workability.

  The particle diameter of the styrene foam pulverized product can be measured using several sieves having different nominal sizes as defined in JIS Z 8801-1: 2006 “Test sieve—Part 1: Metal mesh sieve”. Further, in this specification, “a mass ratio of particles having a particle diameter of 1.18 mm or more and less than 2.00 mm” means that when a sieve having a mesh size of 2.00 mm is used, a sieve having a mesh size of 2.00 mm is used. When a sieve having a sieve mesh of 1.18 mm is used, it means the mass ratio of the particles remaining on the sieve having a sieve mesh of 1.18 mm to the entire lightweight aggregate.

  The content of the styrene foam pulverized product is preferably 20 to 40 parts by volume, more preferably 23 to 35 parts by volume, still more preferably 25 to 33 parts by volume, particularly preferably 100 parts by mass of Portland cement. Is 27 to 31 capacity parts.

  Since the styrene foam pulverized product usually defines the blending amount on a volume basis, the content range is indicated by “volume part”, but the following content is preferred on a mass basis. That is, the content of the styrene foam pulverized product is preferably 0.50 to 1.00 parts by mass, more preferably 0.58 to 0.88 parts by mass, and further preferably 100 parts by mass of Portland cement. It is 0.63-0.83 mass part, Most preferably, it is 0.68-0.78 mass part.

  By setting the content of the styrene foam pulverized product within the above range, a mortar composition having good unit volume mass and good workability can be obtained.

  Perlite aggregates are crushed natural glassy rocks, adjusted in particle size, and then fired at a high temperature to soften the vitreous materials in the rocks and simultaneously remove water from the rocks and foam them, and then classify them. It is obtained. Natural glassy rocks used include obsidian, pearlite, and rosinite.

The bulk density (g / cm ³ ) of the pearlite aggregate is preferably 0.050 to 0.250, more preferably 0.100 to 0.200, and still more preferably 0.120 to 0.180. And particularly preferably 0.140 to 0.160.

  By setting the bulk density of the pearlite aggregate to the above range, a mortar composition having a good unit volume mass and good workability can be obtained.

  The pearlite aggregate does not contain particles having a particle diameter of 2.0 mm or more, and the mass ratio of particles having a particle diameter of 1.18 mm or more and less than 2.0 mm with respect to the entire pearlite aggregate is preferably 2. It is at most mass%, more preferably at most 1.5 mass%, further preferably at most 1 mass%.

  Moreover, while satisfying the above-described mass ratio, the mass ratio of the particles having a particle diameter of 0.6 mm or more and less than 1.18 mm is preferably 5 to 35 mass% with respect to the entire pearlite aggregate. More preferably, it is 10-30 mass%, More preferably, it is 15-25 mass%.

  Further, while satisfying the above-described mass ratio, the mass ratio of the particles having a particle diameter of 0.3 mm or more and less than 0.6 mm is preferably 30 to 60 mass% with respect to the entire pearlite aggregate. More preferably, it is 35-55 mass%, More preferably, it is 40-50 mass%.

  Moreover, while satisfying the above-described mass ratio, the mass ratio of the particles having a particle diameter of 0.15 mm or more and less than 0.3 mm with respect to the entire pearlite aggregate is preferably 10 to 40 mass%, More preferably, it is 15-35 mass%, More preferably, it is 20-30 mass%.

  By setting the particle diameter of the pearlite aggregate to the above-described mass ratio range, a mortar composition having a good unit volume mass and good workability can be obtained. Moreover, the mortar hardening body which has a favorable intensity | strength characteristic and adhesiveness can be obtained.

  The particle diameter of the pearlite aggregate can be measured using several sieves having different nominal sizes as defined in JIS Z 8801-1: 2006 “Test sieve—Part 1: Metal mesh sieve”. Further, in this specification, “the mass ratio of particles having a particle diameter of 1.18 mm or more and less than 2.0 mm” means that when a sieve having a mesh size of 2.0 mm is used, the mesh size is 2.0 mm. When a sieve having a sieve mesh of 1.18 mm is used, it means the mass ratio of particles remaining on the sieve having a sieve mesh of 1.18 mm to the entire pearlite aggregate.

  The content of pearlite aggregate is preferably 55 to 120 parts by volume, more preferably 70 to 100 parts by volume, still more preferably 80 to 90 parts by volume, particularly preferably 100 parts by weight of Portland cement. Is 83 to 88 parts by volume.

  Since the pearlite aggregate usually defines the blending amount on the basis of volume, the content range is indicated by “capacity part”, but the following content is preferable on the mass basis. That is, the content of pearlite aggregate is preferably 3 to 30 parts by mass, more preferably 7 to 20 parts by mass, and further preferably 10 to 16 parts by mass with respect to 100 parts by mass of Portland cement. Especially preferably, it is 12-14 mass parts.

  By setting the content of the pearlite aggregate within the above range, a mortar composition having good unit volume mass and good workability can be obtained. Moreover, the mortar hardening body which has a favorable intensity | strength characteristic and adhesiveness can be obtained.

  By using the above-mentioned styrene foam pulverized product and pearlite aggregate in combination with the cement composition, it is possible to obtain a mortar composition having a good unit volume mass and good workability, as well as good strength properties and adhesiveness. A cured mortar can be obtained.

As the fly ash fine powder, fly ash specified in JIS A 6201: 1999 “Fly ash for concrete” can be used. Further, JIS R 5201: is Blaine specific surface area measured in accordance with 1997 "Physical testing methods for cement" is 2,500~9,000cm ² / g, more preferably at 3,500~7,500cm ² / g There, more preferably from 4,500~6,500cm ² / g, particularly preferably 5,000~6,000cm ² / g.

When the brane specific surface area of the fly ash fine powder is less than 2,500 cm ² / g, the effect of improving the workability of the mortar composition obtained by kneading the cement composition and water tends to be poor. Moreover, when the Blaine specific surface area exceeds 9,000 cm ² / g, the tendency of the viscosity of the mortar composition to increase becomes remarkable, and the workability may be hindered.

  The content of the fly ash fine powder is preferably 30 to 90 parts by mass, more preferably 45 to 70 parts by mass, and still more preferably 50 to 65 parts by mass with respect to 100 parts by mass of Portland cement. Especially preferably, it is 55-60 mass parts.

  When there is too little content of a fly ash fine powder, it will become difficult to obtain favorable workability. On the other hand, when the content of the fly ash fine powder in the mortar composition is excessive, the viscosity of the mortar composition tends to increase, and the workability deteriorates. For this reason, it is preferable that content of a fly ash fine powder is the said range.

  Cellulose-based thickeners include cellulose containing water-soluble cellulose derivatives such as methylcellulose, ethylcellulose, hydroxymethylcellulose, hydroxyethylcellulose, hydroxymethylalkylcellulose, hydroxypropylmethylcellulose, hydroxyethylmethylcellulose, glyoxal-added hydroxypropylmethylcellulose, carboxymethylcellulose and carboxyethylcellulose. Mention may be made of system thickeners.

  The viscosity of the 2% aqueous solution at 20 ° C. of the cellulose-based thickener is preferably 3,000 to 9,000 mPa · s, more preferably 4,000 to 8,000 mPa · s, and still more preferably 4 500 to 7,000 mPa · s, particularly preferably 5,000 to 6,500 mPa · s.

  When the viscosity of the 2% aqueous solution of the cellulose-based thickener at 20 ° C. is less than 3,000 mPa · s, the shape retention of the mortar composition is lowered, and an excellent effect is not achieved. Moreover, when the viscosity of the 2% aqueous solution of the cellulose-based thickener at 20 ° C. exceeds 9,000 mPa · s, the viscosity becomes high and the workability of the mortar composition may be hindered.

  Here, the “viscosity” of the cellulosic thickener means that a 2% aqueous solution of the thickener is obtained by using a B-type viscometer (digital viscometer manufactured by BROOKFIELD: RVDV-1 +) with a rotor No. 4. A value measured at a rotational speed of 12 rpm and 20 ° C.

  The content of the cellulose-based thickener is preferably 0.01 to 0.20 parts by mass, more preferably 0.05 to 0.16 parts by mass, and still more preferably with respect to 100 parts by mass of Portland cement. Is 0.08 to 0.14 parts by mass, particularly preferably 0.10 to 0.12 parts by mass.

  When there is too little content of a cellulose thickener, it will become difficult to obtain favorable workability. On the contrary, when the content of the cellulose-based thickener in the mortar composition is excessive, the viscosity of the mortar composition tends to increase, and workability is deteriorated. For this reason, it is preferable that content of a cellulose thickener is the said range.

  The material separation reducing agent is a polymer synthetic copolymer, and the viscosity of a 2% aqueous solution at 20 ° C. is preferably 2,000 to 8,000 mPa · s, more preferably 2,500 to 6,500 mPa · s. More preferably 3,000 to 5,500 mPa · s, and particularly preferably 3,500 to 5,000 mPa · s.

  When the viscosity of the 2% aqueous solution of the material separation reducing agent at 20 ° C. is less than 2,000 mPa · s, the material separation resistance of the mortar composition is lowered, and an excellent effect is not achieved. On the other hand, when the viscosity of the 2% aqueous solution of the material separation reducing agent at 20 ° C. exceeds 8,000 mPa · s, the viscosity increases and the workability of the mortar composition may be hindered.

  Here, the “viscosity” of the material separation reducing agent means that a 2% aqueous solution of the material separation reducing agent is obtained by using a B-type viscometer (digital viscometer manufactured by BROOKFIELD: RVDV-1 +) with rotor No. 4. A value measured at a rotational speed of 12 rpm and 20 ° C.

  The thixotropic index (TI value) of a 2% aqueous solution of the material separation reducing agent at 20 ° C. is preferably 2.00 to 3.60, more preferably 2.20 to 3.40, and even more preferably 2. It is 40-3.20, Most preferably, it is 2.60-3.00.

  When the TI value of the 2% aqueous solution of the material separation reducing agent at 20 ° C. is less than 2.00, the material separation resistance of the mortar composition is lowered, and an excellent effect is not achieved. Moreover, when the TI value of the 2% aqueous solution of the material separation reducing agent at 20 ° C. exceeds 3.60, the thixotropy is increased and the workability of the mortar composition may be hindered.

  Here, the “TI value” of the material separation reducing agent refers to a 2% aqueous solution of the material separation reducing agent in accordance with JIS · K · 5101-6-2: 2004. Viscometer: RVDV-1 +) and rotor No. 4. The value measured at 20 ° C.

  The content of the material separation reducing agent is preferably 0.01 to 0.15 parts by mass, more preferably 0.02 to 0.10 parts by mass, further preferably 100 parts by mass of Portland cement. It is 0.04-0.08 mass part, Especially preferably, it is 0.05-0.07 mass part.

  If the content of the material separation reducing agent is too small, it is difficult to obtain good workability. On the contrary, if the content of the material separation reducing agent in the mortar composition is excessive, the viscosity of the mortar composition tends to increase, and the workability is lowered. For this reason, it is preferable that content of a material separation reducing agent is the said range.

  By using the above-mentioned cellulose-based thickener and material separation reducing agent in combination with a cement composition, a mortar composition having good workability can be obtained, and mortar curing having good adhesiveness and strength characteristics You can get a body.

  The cement composition used in the method for constructing a concrete structure according to this embodiment can further preferably use a linear saturated fatty acid metal salt. Moreover, carbon number of this saturated fatty acid metal salt becomes like this. Preferably it is 12-24, More preferably, it is 14-22, Especially preferably, it is 16-20.

  Examples of the metal salt used for the saturated fatty acid metal salt include lithium salt, magnesium salt, calcium salt, magnesium salt, barium salt, zinc salt, aluminum salt and the like, and aluminum salt is particularly preferable.

  The saturated fatty acid metal salt can be appropriately added within a range not impairing the properties of the cement composition. The amount of the saturated fatty acid metal salt added is preferably 0.15 to 0.40 parts by mass, more preferably 0.20 to 0.35 parts by mass, and still more preferably 100 parts by mass of Portland cement. It is 0.26-0.32 mass part, Most preferably, it is 0.28-0.30 mass part.

  By using the saturated fatty acid metal salt within the above range, the improvement in the adhesiveness of the mortar cured body is further ensured.

  The cement composition used in the method for constructing a concrete structure according to this embodiment can further use a re-emulsified resin powder as necessary.

  There are no particular restrictions on the type of re-emulsified resin powder, such as the method of pulverizing the resin, and those manufactured by known production methods can be used. What has adhered the agent mainly on the surface of the re-emulsification type resin powder can be used. The re-emulsified resin powder may be a re-emulsified resin powder obtained by removing the solvent from the aqueous polymer dispersion by a method such as spraying or freeze drying.

As the re-emulsifying resin powder, for example, polymer resin particles obtained by removing a liquid component of a polymer emulsion obtained by emulsion polymerization of an α, β-ethylenically unsaturated monomer can be used. . Examples of the α, β-ethylenically unsaturated monomer include known α, β-ethylenically unsaturated monomers such as acrylic acid and acrylate derivatives, methacrylic acid and methacrylic acid esters. Derivatives such as α-olefins such as ethylene and propylene, aromatic vinyls such as vinyl acetate and styrene, vinyl chloride and versatile acid vinyl esters such as tertiary fatty acid vinyl esters (R-COO) having 9 to 11 carbon atoms -CH = _CH 2, R may be mentioned tertiary carbon) of 9 to 11 carbon atoms.

  The re-emulsifying resin powder can be appropriately added as long as the properties of the cement composition are not impaired. The amount of the re-emulsified resin powder added is preferably 0.25 to 0.90 parts by mass, more preferably 0.35 to 0.80 parts by mass, and still more preferably 100 parts by mass of Portland cement. It is 0.45-0.70 mass part, Most preferably, it is 0.55-0.60 mass part.

  The preferred embodiment of the present invention has been described above, but the present invention is not limited to the above embodiment.

  The contents of the present invention will be described in more detail with reference to the following experimental examples, but the present invention is not limited to the following experimental examples.

(Experimental example 1)
A cement composition was prepared by blending 100 parts by mass of Portland cement with fine aggregate, foamed polystyrene pulverized material, pearlite aggregate, fly ash fine powder, thickener and separation reducing agent in the parts by mass shown in Table 4. A mortar composition was prepared by kneading water in 100 parts by mass of the cement composition at a part by mass shown in Table 4. The kneading was performed at a low speed for 3 minutes using a Hobart mixer under the conditions of a temperature of 20 ° C. and a relative humidity of 65%. Immediately after kneading, the flow value, unit volume mass, and fillability are measured, and then the mortar composition is smeared on the wall surface to evaluate the wrinkle workability. The applied mortar composition is cured to obtain a cured mortar. The surface accuracy was evaluated after The results are also shown in Table 4.

[Materials used]
(1) Portland cement Normal Portland cement (manufactured by Ube Mitsubishi Cement Co., Blaine specific surface area: 3300 cm ² / g)
(2) Fine aggregates ・ Silica sand No. 7 (Table 1 shows the particle size composition of silica sand measured using a sieve)

(3) Lightweight aggregate-Styrofoam pulverized product (made by Honma Kosha Co., Ltd., bulk density: 0.025 g / cm ³ , the particle size constitution of the styrene foam pulverized product measured using a sieve is shown in Table 2.)
Perlite aggregate (made by Showa Chemical Industry Co., Ltd., bulk density: 0.15 g / cm ³ , and the particle size composition of the polystyrene foam pulverized product measured using a sieve is shown in Table 3)

(4) Fly ash fine powder ・ Fly ash (manufactured by Joban Thermal Power Industry Co., Ltd., Brain specific surface area: 5,590 cm ² / g)
(5) Thickener ・ Cellulosic thickener (manufactured by Ube Industries, trade name: High Euros, main component: methyl hydroxyalkyl cellulose, viscosity [20 ° C., 2 wt% aqueous solution]: 5,150 mPa · s)
(6) Separation reducing agent-Polymer synthetic copolymer (manufactured by BASF, trade name: Melvis F40, viscosity [20 ° C, 2 wt% aqueous solution]: 4,283 mPa · s, TI value [20 ° C, 2 wt% aqueous solution] : 2.76)

[Method for evaluating physical properties of mortar composition and cured mortar]
(1) Measurement method of flow value The flow value was measured according to the test method described in JIS R 5201: 1997 "Physical test method of cement".
(2) Measurement method of unit volume mass Unit volume mass was measured based on the test method described in JIS A 1171: 2000 “Test method of polymer cement mortar”.
(3) Sprinkling workability The mortar composition is applied to the surface of a flexible board perpendicular to the floor using a stainless steel scissors so that the thickness is 10 mm. Evaluation was made on four items, namely, flaw breakage, wrinkle feed, wrinkle elongation, and wrinkle separation, and comprehensively judged in three stages: good ○, slightly bad Δ, and bad ×.
(4) Surface accuracy The mortar composition was applied on a flexible board placed perpendicular to the floor surface to a thickness of 10 mm using a stainless steel slab, and the surface condition after curing the next day was visually observed. Then, the surface accuracy was judged in three stages from the uneven state: good (smooth surface), slightly defective Δ (slightly uneven), and defective x (large unevenness).
(5) Fillability The mortar composition was sucked and extruded three times using a mortar filling machine “Tsumaru D-18 (stroke volume 0.9 L)” manufactured by Tomojo Kenki Co., Ltd. The ratio (%) of the volume of the extruded mortar composition to 3 times the stroke volume (2.7 L) was determined as the filling property.

  As shown in Table 4, No. 1 containing a fine aggregate, fine fly ash powder and no separation reducing agent. 1-1 requires a large amount of water for obtaining a flow value of 198 mm of the mortar composition, the unit volume mass is also small, the dredging workability is poor, and the surface finish accuracy of the cured mortar cured product is also poor. Indicated. No. 1 containing no fly ash fine powder and no separation reducing agent. No. 1-2 showed the result that the flow value was 193 mm but the dredging workability was poor. No. with a formulation that does not contain a separation reducing agent. 1-3 showed the result that the flow value was 190 mm, but the dredging workability was insufficient. No. of the combination containing fine aggregate, fly ash fine powder and separation reducing agent. 1-4 shows a result that the flow value of the mortar composition is 188 mm, the workability of the mortar is good, and the surface finish accuracy of the cured mortar body is also good.

  Further, as shown in Table 5, No. 1 containing fly ash fine powder and a material separation reducing agent. 1-4 is No. 1-4. 1-1 and No.1. Although the flow value was lower than that of 1-2, the filling property was good.

(Experimental example 2)
Experiment No. 1-4, a linear fatty acid metal salt and a re-emulsified resin powder are blended in a part by mass shown in Table 6 to prepare a cement composition. Water is added to 100 parts by mass of the cement composition in Table 6. A mortar composition was prepared by kneading in the parts by mass shown in FIG. The kneading was performed at a low speed for 3 minutes using a Hobart mixer under the conditions of a temperature of 20 ° C. and a relative humidity of 65%. The flow value, unit volume mass, and fillability were measured immediately after kneading in the same manner as in Experimental Example 1, and then the mortar composition was applied to the wall surface with a scissors to evaluate the wrinkle workability, and the applied mortar composition was cured. After the mortar hardened body was obtained, the surface accuracy was evaluated. In addition, the strength characteristics and adhesive strength of the cured mortar material at the age of 28 days were evaluated. The results are also shown in Table 6.

[Materials used]
(1) Linear fatty acid metal salt ・ Fatty acid metal salt (manufactured by NOF Corporation, carbon number: 18, metal salt: aluminum salt)
(2) Re-emulsifying resin powder-Resin powder (Wacker, trade name: LL5010N, main component: ethylene-vinyl acetate copolymer)

[Method for evaluating physical properties of mortar composition and cured mortar]
(1) Strength measurement method Based on the test method described in JIS A 6916: 2000 “Preparation coating material for building construction”, the bending strength and compressive strength at the age of 28 days were measured and used as indices of strength characteristics.
(2) Measuring method of adhesive strength Based on the test method described in JIS A 6916: 2000 “Underlaying base coating material for building”, the adhesive strength at 28 days of age was measured and used as an index of adhesiveness. The mortar composition was applied by applying a primer on the surface of the base substrate and applying the mortar composition the next day.

  As shown in Table 6, no. No. 2-1 (No. 1-4) showed good mortar workability, good surface finish accuracy of the mortar cured body, and good strength characteristics and adhesiveness. Furthermore, No. 1 containing a linear fatty acid metal salt. 2-2 showed the result that strength characteristics and adhesiveness were further improved. No. of formulation containing re-emulsifying resin powder. 2-3 is No. Although the bending strength characteristics were improved compared to 2-1, the compressive strength characteristics and adhesiveness were sufficient but slightly decreased. No. 1 containing a linear fatty acid metal salt and a re-emulsifying resin powder. 2-4 is No. 2-4. Although the adhesiveness was improved as compared with 2-1, the compressive strength characteristics were satisfactory but showed a slight decrease.

  As shown in Table 7, no. No. 1 in which a linear fatty acid metal salt was further added to 2-1. 2-2 shows a flow value of No. 2-2. Despite being almost equivalent to 2-1, the results showed better filling properties.

  From the above, no. As in 2-1, the cement composition, mortar composition, and mortar hardened body of the present invention containing fine aggregate, fly ash fine powder and separation reducing agent have good flow value, unit volume mass, and good filling property. It has been confirmed that it has good strength characteristics and adhesiveness for integrating the concrete structure with the window frame or piping, etc.

  Furthermore, no. No. 2-2 to No. 2 As shown in 2-4, it was confirmed that a sufficient effect was obtained even when a linear fatty acid metal salt or a re-emulsified resin powder was added. In particular, no. As in 2-2, it was confirmed that the addition of a linear fatty acid metal salt improved the filling properties and the strength characteristics and the adhesiveness for integrating the concrete structure with the window frame or piping. .

Claims (5)

A construction method of the concrete structure which inlaid the window frame or piping into the concrete structure,
A mortar preparation step of preparing a mortar composition by blending and kneading a cement composition and water, a mortar suction step of sucking the mortar composition into a mortar filler,
A mortar filling step of filling a gap portion that is a gap between a concrete structure and a window frame or a pipe with the mortar composition sucked into the mortar filler;
A mortar finishing step of finishing a surface portion exposed to the outside of the mortar composition filled in the void portion with a scissors;
A cured body forming step of curing the mortar composition finished with glazing to form a mortar cured body,
The cement composition includes Portland cement, fine aggregate, lightweight aggregate, fly ash fine powder, cellulosic thickener and material separation reducing agent,
The lightweight aggregate is a styrene foam pulverized product and a pearlite aggregate,
The fly ash fine powder has a Blaine specific surface area of 2,500 to 9,000 cm ² / g,
Said material separation reducing agent, Ri polymeric synthetic copolymer der,
The cement composition is 75 to 175 parts by mass of the fine aggregate, 0.50 to 1.00 parts by mass of the styrofoam pulverized material, 3 to 30 parts by mass of the pearlite aggregate, with respect to 100 parts by mass of Portland cement. 30 to 90 parts by mass of fly ash fine powder, 0.01 to 0.20 parts by mass of the cellulose-based thickener, 0.01 to 0.15 parts by mass of the material separation reducing agent,
Construction method for concrete structures. The fine aggregate has a particle size of 0.15 mm or more and a mass ratio of particles of less than 0.3 mm is 30 to 70% by mass,
The mass ratio of particles having a particle diameter of 0.075 mm or more and less than 0.15 mm is 30 to 70% by mass.
The construction method of the concrete structure of Claim 1. The polystyrene foam pulverized product has a bulk density of 0.005 to 0.050 g / cm ³ , a particle size of 1.18 mm or more and a mass ratio of particles of less than 2.0 mm of 10 to 30% by mass. ,
The mass ratio of particles having a particle diameter of 0.6 mm or more and less than 1.18 mm is 30 to 70% by mass,
The mass ratio of particles having a particle diameter of 0.3 mm or more and less than 0.6 mm is 20 to 40% by mass.
The construction method of the concrete structure of Claim 1 or Claim 2. The pearlite aggregate has a bulk density of 0.050 to 0.250 g / cm ³ ,
The mass ratio of particles having a particle diameter of 0.6 mm or more and less than 1.18 mm is 5 to 35% by mass,
The mass ratio of particles having a particle diameter of 0.3 mm or more and less than 0.6 mm is 30 to 60% by mass,
The particle diameter is 0.15 mm or more and less than 0.3 mm, and the mass ratio of the particles is 10 to 40 mass%.
The construction method of the concrete structure of any one of Claims 1-3. The cement composition further includes a linear saturated fatty acid metal salt, and the saturated fatty acid metal salt has 12 to 24 carbon atoms.
The construction method of the concrete structure of any one of Claims 1-4 .