JP2013129570A - Heavy weight polymer cement mortar - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heavy weight polymer cement mortar capable of repairing a step with the thickness of several millimeters of a concrete structure using heavy weight concrete by being smeared thinly, and to provide a heavy weight polymer cement mortar hardly generating a crack, dry-out, exfoliation or float even when being smeared on the heavy weight concrete surface with the thickness of <1 millimeter.SOLUTION: The heavy weight polymer cement mortar contains, with respect to (A) 100 pts.mass of cement, (B) 180-400 pts.mass of an aggregate wherein the content rate of particles whose particle size is over 0.6 millimeter is ≤5 mass%, while the content rate of particles whose particle size is 0.15-0.3 mm is 40-60 mass%, and the specific gravity is 3.0-4.5, (C) 3-25 pts.mass of an organic binder, (D) 0.3-7 pts.mass of a deforming agent, and (E) 0.05-0.5 pt.mass of an organic thickener.

Description

  The present invention relates to a weight polymer cement mortar, and more particularly to a weight polymer cement mortar that can be lightly coated.

When constructing a concrete structure, concrete is often cast by assembling reinforcing bars in the formwork. The hardened concrete after demolding often has a level difference of about several millimeters such as unevenness due to the accuracy of the formwork. In general, a polymer cement mortar base material using a lightweight aggregate or the like is used for the adjustment (repair) of the step.
When repairing this level difference of about several millimeters with polymer cement mortar base conditioner, the base conditioner should be thick enough to fill the depth of the concave part (concave part) of the concrete (about several millimeters). The surface adjustment material is applied to a portion of the concrete that is not recessed with a thickness of less than 1 mm so that the surface of the background adjustment material becomes smooth.

On the other hand, in medical, academic research, and industrial fields, facilities that use radioactive materials or facilities that use radiation including X-rays may use heavy concrete on walls, floors, and ceilings in order to enhance the radiation shielding effect. is there. When a concrete structure is constructed using this heavy concrete, the step is likely to occur because the pressure applied to the formwork is larger than that of normal concrete.
In repairing a level difference in a concrete structure using heavy concrete, it is required to repair with heavy concrete or heavy mortar in order to ensure the radiation shielding effect. However, with heavy concrete, even when repairing a step of about several millimeters, it will increase by a thickness of about 10 cm, which cannot be handled because the weight of the structure increases or the internal volume of the structure decreases. It is also possible. Further, in heavy concrete, there is a possibility that a step is generated in another place as well. For this reason, it is preferable to use weight mortar (for example, refer patent document 1-patent document 3) for the repair of the said level | step difference.

JP 2001-302302 A JP 2005-047772 A JP-A-2005-015306

  However, since the weight mortar described in Patent Document 1 or Patent Document 2 is a grout mortar or filled mortar with excellent fluidity, when repairing a step in a wall or ceiling, the gap with the heavy concrete is about several centimeters. It is not suitable for repairing a step of several millimeters because it is filled with heavy concrete after assembling the mold so as to become. Moreover, in the plastering high specific gravity polymer cement mortar described in Patent Document 3, since the aggregate is coarse, a coating thickness of several mm or more is necessarily required, and the amount of mortar is unnecessarily large. Further, from the inventive technique described in Patent Document 3, simply changing the aggregate to a fine one increases the surface area per unit volume of the mortar-coated portion with a thickness of less than 1 mm. There is a high risk of peeling or floating (partial peeling).

  An object of this invention is to provide the heavy polymer cement mortar which can be repaired by apply | coating thinly the level | step difference of about several millimeters of the concrete structure using heavy concrete. It is another object of the present invention to provide a heavy polymer cement mortar that is less likely to crack, dry out, peel off or float even when applied to a heavy concrete surface with a thickness of less than 1 mm.

  Therefore, the present inventors have studied to develop a thin mortar that is a heavy polymer cement mortar, and as a result, blended cement, an organic binder, an antifoaming agent, and an organic thickener, and further aggregated particles. Rather than simply reducing the diameter, it is possible to apply a thin coating of less than 1 mm by using an aggregate with a specific particle diameter range and a high specific gravity, and cracking, dry-out peeling or floating The inventors have found that a heavy polymer cement mortar that is unlikely to occur can be obtained, and the present invention has been completed.

That is, the present invention provides the following [1] to [5].
[1] (A) For 100 parts by mass of cement,
(B) The content ratio of particles having a particle diameter exceeding 0.6 mm is 5% by mass or less, the content ratio of particles having a particle diameter of 0.15 to 0.3 mm is 40 to 60% by mass, and the specific gravity is 3.0 to 4. 180 to 400 parts by mass of the aggregate of .5
(C) 3 to 25 parts by mass of an organic binder,
(D) A weight polymer cement mortar containing 0.3 to 7 parts by mass of an antifoaming agent and (E) 0.05 to 0.5 parts by mass of an organic thickener.
[2] The weight polymer cement mortar according to [1], wherein the content of particles having a particle diameter of less than 0.15 mm in the (B) aggregate is 20 to 40% by mass.
[3] Furthermore, with respect to 100 parts by mass of cement,
(F) 1 to 7 parts by mass of an expanding material,
And / or (G) The weight polymer cement mortar according to [1] or [2], comprising 0.2 to 0.5 parts by mass of nylon fibers.
[4] The weight polymer cement mortar according to any one of [1] to [3], wherein the dry unit volume mass is 2.15 kg / L or more.
[5] In the (B) aggregate, the content of particles having a particle diameter exceeding 0.3 mm is 30% by mass or less, the content of particles having a particle diameter exceeding 0.6 mm is 5% by mass or less, and the particle diameter is 0.15. It is an aggregate having a particle content of ˜0.3 mm of 40-60% by mass, a content of less than 0.15 mm of particle size of 20-40% by mass, and a specific gravity of 3.0-4.5 [1. ] The weight polymer cement mortar in any one of [4].

  ADVANTAGE OF THE INVENTION According to this invention, the heavy polymer cement mortar which can be repaired by apply | coating thinly the level | step difference of about several millimeters of the concrete structure using heavy concrete is obtained. In addition, the present invention provides a heavy polymer cement mortar that does not easily crack, dry out, peel off, or float even when applied to a heavy concrete surface with a thickness of less than 1 mm. In addition, a concrete structure using heavy concrete in which a level difference of about several millimeters is repaired using the present invention is a structure having an excellent aesthetic appearance because the surface becomes smooth.

A schematic cross-sectional view of a heavy concrete test plate is shown. The typical sectional drawing of the heavy concrete test board which applied polymer cement mortar and repaired the level | step difference is shown.

  As the (A) cement in the present invention, one or more selected from hydraulic cement and pneumatic cement can be used. Examples of hydraulic cement include ordinary, early strength, very early strength, low heat and moderate heat Portland cement, eco cement, and these Portland cement or eco cement, fly ash, blast furnace slag, silica fume, limestone fine powder, etc. And various mixed cements mixed with each other, ultrafast cements such as “Jet Cement” (trade name) manufactured by Taiheiyo Cement Co., Ltd., “Jet Cement” (trade name) manufactured by Sumitomo Osaka Cement Co., Ltd., alumina cement, hemihydrate gypsum, and the like. Examples of the air-cement cement include slaked lime and dolomite plaster. Since it is easy to obtain the same strength as the heavy concrete to be repaired, hydraulic cement is preferable as the cement used in the present invention, and since it is easy to ensure a long working life, various portland cements, eco cements, alumina cements, and various types It is preferable to use one or more selected from mixed cement.

(B) Aggregate in the present invention has a content of particles having a particle diameter exceeding 0.6 mm of 5% by mass or less, and a content of particles having a particle diameter of 0.15 to 0.3 mm is 40 to 60% by mass. An aggregate having a specific gravity of 3.0 to 4.5 is used.
When the content of particles having a particle diameter exceeding 0.6 mm in the aggregate exceeds 5% by mass, it is difficult to apply to the concrete surface with a thickness of less than 1 mm, and the particles having a particle diameter exceeding 0.6 mm in the aggregate are more preferable. It is most preferable that the content is 1% by mass or less, more preferably 0.1% by mass or less, and no particles having a particle diameter exceeding 0.6 mm are contained.
In addition, if the content of particles of 0.15 to 0.3 mm in the aggregate is less than 40% by mass or more than 60% by mass, cracks are likely to occur or the workability of the coated surface is poor and the finish of the coated surface is poor. It is difficult to apply thinly. Since cracks are unlikely to occur, the workability is good and the coating is thin and easy to apply, the content of particles having a particle size of 0.15 to 0.3 mm in the aggregate is 40 to 60% by mass, and the particle size is 0.15 mm. The aggregate is preferably an aggregate having a content of less than 20 to 40% by mass or a particle having a particle diameter exceeding 0.3 mm of 30% by mass or less. More preferably, the content of particles having a particle size of 0.15 to 0.3 mm in the aggregate is 40 to 60% by mass, the content of particles having a particle size of 0.15 mm or less is 20 to 40% by mass, and the particle size is 0. An aggregate having a particle content of more than 3 mm of 30% by mass or less and a particle content of more than 0.6 mm is used by 5% by weight or less.

  In the present invention, particles exceeding 0.6 mm refer to particles that remain on a sieve having a nominal nominal size (hereinafter referred to as “mesh”) of 0.6 mm. Moreover, the particle | grains with a particle diameter of 0.3-0.6 mm say the particle | grains which remain on the sieve with an opening of 0.3 mm, and pass the sieve with an opening of 0.6 mm. Similarly, a particle having a particle size of 0.15 to 0.3 mm refers to a particle that remains on a sieve having an aperture of 0.15 mm and passes through a sieve having an aperture of 0.3 mm. Means particles passing through a sieve having an aperture of 0.15 mm.

  The specific gravity of the aggregate used in the present invention is 3.0 to 4.5. When the aggregate is less than 3.0, the dry unit volume mass of the polymer cement mortar is less than 2.15 kg / L, which is insufficient. Moreover, in the aggregate exceeding 4.5, there exists a high possibility that uncured mortar may peel off, peel off, sag, or deform when applied to a wall or ceiling. However, if the average specific gravity of the aggregate is in the range of 3.0 to 4.5, the aggregate having the specific gravity deviated from 3.0 to 4.5 should be within the range of 5% by volume or less in the aggregate. It can also be contained. It is more preferable to use only an aggregate having a specific gravity of 3.0 to 4.5 without using an aggregate having a specific gravity deviating from 3.0 to 4.5.

  The material of the aggregate used in the present invention is not particularly limited as long as the specific gravity of the aggregate is within the above range. Examples of preferred examples include nepheline, meteorite, barite, goethite, limonite, barium calcite, copper slag, ferronickel slag, ferrochrome slag, and the like.

  Content of the said (B) aggregate in the weight polymer cement mortar of this invention is 180-400 mass parts with respect to 100 mass parts of cement. If the amount is less than 180 parts by mass, the amount of unit cement in the polymer cement mortar becomes large, so that cracking is likely to occur. Preferably, the amount is 200 to 400 parts by mass, more preferably 200 to 300 parts by mass because cracking is difficult to occur, sufficient adhesion strength is obtained, and the finish of the mortar surface is good.

The organic binder (C) used in the present invention is not particularly limited as long as it is used as a binder for polymer cement mortar or polymer cement concrete. For example, styrene / butadiene copolymer, chloroprene rubber, acrylonitrile / butadiene copolymer Synthetic rubber such as coalescence or methyl methacrylate / butadiene copolymer, natural rubber, polyolefin such as polyethylene or polypropylene, polychloroprene, polyacrylic ester, styrene / acrylic copolymer, all acrylic copolymer, polyvinyl acetate, acetic acid Vinyl / acrylic copolymer, vinyl acetate / acrylic acid ester copolymer, modified vinyl acetate, ethylene / vinyl acetate copolymer, ethylene / vinyl acetate / vinyl chloride copolymer, vinyl acetate vinyl versatate copolymer, acrylic ·vinegar Vinyl acetate-based resin such as vinyl-veova (trade name of t-vinyl decanoate) copolymer, unsaturated polyester resin, polyurethane resin, alkyd resin and epoxy resin, bitumen such as asphalt, rubber asphalt and paraffin The quality etc. are mentioned as a preferable example, These 1 type (s) or 2 or more types can be used.
Because the construction surface (the surface of the mortar coated with glazing) can be finished smoothly, that is, it has excellent iron workability, the organic binder used in the present invention includes polyvinyl acetate, vinyl acetate, Acrylic copolymer, vinyl acetate / acrylic acid ester copolymer, modified vinyl acetate, ethylene / vinyl acetate copolymer, ethylene / vinyl acetate / vinyl chloride copolymer, vinyl acetate vinyl versatate copolymer, acrylic / acetic acid Vinyl acetate-based resins such as vinyl-veova (trade name of t-vinyl decanoate) copolymer; polyacrylate, polymethacrylate, acrylate / styrene copolymer, styrene / acrylic copolymer, all Acrylic resins such as acrylic copolymers; Polyolefin resins such as polyethylene and polypropylene; Down-butadiene copolymer, chloroprene rubber, it is preferable to use one or more selected from synthetic rubber such as acrylonitrile-butadiene copolymer or a methyl methacrylate-butadiene copolymer.
The state of the organic binder used in the present invention may be any of a liquid, an emulsion, or a re-emulsifying powder resin in which an emulsion is powdered. An emulsion or a re-emulsifying powder resin is preferred because it is not necessary to add a curing agent.

  The content of the organic binder (C) in the heavy polymer cement mortar of the present invention is a non-volatile amount at 105 ° C. (hereinafter sometimes simply referred to as “non-volatile amount”) with respect to 100 parts by mass of the cement. ˜25 parts by mass. If it is less than 3 parts by mass, the required adhesion strength cannot be obtained. Moreover, when it exceeds 25 mass parts, entrainment air will increase and the dry unit volume mass of polymer cement mortar will run short, and the finish of the mortar surface will be bad. Since the mortar is less likely to be peeled off or peeled off when applied to a concrete surface with a thickness of less than 1 mm, the dry unit volume mass is large and a good mortar surface finish is obtained. The non-volatile content at 105 ° C. is preferably 5 to 20 parts by mass with respect to 100 parts by mass of cement. Since the dry unit volume mass is large and higher adhesion strength can be obtained, the content of the organic binder is more preferably 8 to 20 parts by mass with respect to 100 parts by mass of cement in terms of a nonvolatile content.

  (D) Antifoaming agent used in the present invention includes commercially available defoaming agent for cement, commercially available antifoaming agent for cement mortar, or commercially available antifoaming agent for concrete, as well as other mineral oils and ethers. Suitable examples include silicone-based antifoaming agents, tributyl phosphate, polydimethylsiloxane, or polyoxyalkylene alkyl ether-based nonionic surfactants. You may use an antifoamer in combination of these 2 or more types. Further, it may be a powder that is supported on an inorganic powder.

  Content of the (D) antifoamer in the weight polymer cement mortar of this invention is 0.3-7 mass parts with respect to 100 mass parts of cement. If the amount is less than 0.3 parts by mass, the defoaming effect is difficult to obtain, and the dry unit volume mass of the polymer cement mortar becomes less than 2.15 kg / L, and if it exceeds 7 parts by mass, the strength of the polymer cement mortar after curing is reduced. There is a risk of it happening. Since the defoaming effect is easily obtained and the dry unit volume mass of the polymer cement mortar is larger and good strength is obtained, the content of the defoaming agent is 0.5 to 5 parts by mass with respect to 100 parts by mass of cement. It is preferable to do. More preferably, content of an antifoamer shall be 2-5 mass parts with respect to 100 mass parts of cement.

  Examples of the (E) organic thickener used in the present invention include hydroxyalkyl celluloses such as hydroxyethyl cellulose (HEC) and hydroxypropyl cellulose (HPC), hydroxyethyl methyl cellulose (HEMC), hydroxypropyl methyl cellulose (HPMC), Water-soluble celluloses such as hydroxyalkylethylcellulose (HEEC) and the like; polysaccharides such as alginic acid, β-1,3 glucan, pullulan and welan gum; polyvinyl compounds such as acrylic resin and polyvinyl alcohol; methyl starch, ethyl Alkyl starch such as starch, propyl starch or methylpropyl starch, hydroxyalkyl starch such as hydroxyethyl starch or hydroxypropyl starch, or These include starch ethers such as hydroxyalkylalkyl starch such as hydroxypropylmethyl starch, and one or more of these can be used, but uncured mortar is dried out, peeled off, peeled off, drooped and deformed Water-soluble cellulose and / or starch ether is preferable.

  Content of the (E) organic thickener in the weight polymer cement mortar of this invention is 0.05-0.5 mass part with respect to 100 mass parts of cement. If it is less than 0.05 parts by mass, there is a high possibility that the uncured mortar will dry out, peel off, peel off, droop or deform. Moreover, when it exceeds 0.5 mass part, the finish of the mortar surface is bad. Since there is a low risk of dryout, peeling, peeling, sagging and deformation and a better mortar surface finish is obtained, the content of the organic thickener is 0.1 to 0 with respect to 100 parts by mass of cement. .3 parts by mass is preferable.

The weight polymer cement mortar of the present invention preferably contains (F) an expanding material in order to suppress the occurrence of cracks due to shrinkage of the mortar during or after curing. In particular, when applying to the surface of heavy concrete with a thickness of 2 mm or more, it is preferable to contain an expanding material in the heavy polymer cement mortar of the present invention because curing shrinkage can be reduced.
As the expansion material used in the present invention, any material may be used as long as a hydrated crystal such as calcium hydroxide or ettringite grows by hydration and a substance having a large bulk volume is used as a main component. Specifically, quick lime, calcium sulfoaluminate, anhydrous gypsum, magnesia, lime-based expansive material, ettringite-based expansive material and the like are preferable examples, and one or two or more of these or similar substances are used. It is possible. As the expansion material to be used, the expansion material conforming to JIS A 6202 “Expansion material for concrete” has a stable expansion rate with respect to the mixing amount, so the performance of suppressing cracking of the mortar hardened body with respect to the mixing amount is also stable. This is particularly preferable. The content of the expansion material in the heavy polymer cement mortar of the present invention is preferably 1 to 7 parts by mass with respect to 100 parts by mass of cement. If the content of the expansion material is small, the effect may be insufficient. If the content is too large, the mortar may float or peel from the underlying heavy concrete. Since the effect of reducing the curing shrinkage due to the addition of the expansion material is sufficiently obtained and the mortar is less likely to float or peel from the underlying heavy concrete, the content of the expansion material is 2 to 5 mass relative to 100 mass parts of cement. More preferably, it is a part.

The weight polymer cement mortar of the present invention preferably contains (G) nylon fibers because the finish of the mortar surface is easy to smooth. Moreover, the crack of a mortar can be suppressed more by containing nylon fiber. When fibers other than nylon fibers, such as vinylon fibers, are mixed, the flowability of the mortar is remarkably reduced, and therefore the mortar may float or peel from the underlying heavy concrete.
As a nylon fiber used for this invention, the fiber length of 3-20 mm and the fiber diameter of 10-40 micrometers are preferable. When materials other than water and liquid admixtures (including resin emulsions) are premixed by mixing with a mixer in advance, those having a fiber length of 5 to 10 mm and a fiber diameter of 20 to 35 μm are included in the premix mortar. Nylon fibers are more preferable because they are easily dispersed.
The nylon fiber content in the heavy polymer cement mortar of the present invention is preferably 0.2 to 0.5 parts by mass with respect to 100 parts by mass of cement. If the content is too small, the effect of containing nylon fibers cannot be expected. If the content is too large, it becomes difficult to finish the mortar surface smoothly and the dry unit volume mass tends to be small.

  The heavy polymer cement mortar of the present invention preferably contains substantially no water reducing agent. Here, the water reducing agent includes an AE water reducing agent, a high performance water reducing agent, a high performance AE water reducing agent, and a fluidizing agent, and “substantially free of water reducing agent” means that the water reducing agent is not added. 10. JIS R 5201-1997 “Physical testing method of cement” immediately after kneading with a thing It means that the difference in flow values (hereinafter simply referred to as “flow values”) measured according to the flow test is 10 or less, and it is more preferable that no water reducing agent is contained.

  Moreover, when the dry unit volume mass of the heavy polymer cement mortar of the present invention is 2.15 kg / L or more, the dry unit volume mass is closer when the underlying heavy concrete is heavy concrete for shielding radiation. This is preferable because the shielding effect is not likely to be insufficient.

  In the heavy polymer cement mortar of the present invention, in addition to cement, an organic binder, an aggregate, an antifoaming agent, an organic thickener, an expanding material, and a nylon fiber, one or more kinds of other admixtures can be used. It can be used in combination as long as the effect is not impaired. Examples of such admixtures include setting retarders, foaming agents, foaming agents, waterproofing agents (agents), rust inhibitors, shrinkage reducing agents, inorganic thickeners such as sepiolite and bentonite, pigments, and nylon fibers. Fiber, water repellent, whitening prevention agent, quick setting agent (material), hardening accelerator (material), strength accelerator (material), blast furnace slag fine powder, fly ash, silica fume, talc (talc) fine powder, pyro Examples thereof include phyllite fine powder, mica fine powder, sericite fine powder, and a surface hardening agent.

  The weight polymer cement mortar of the present invention is used by kneading with water in an amount that makes the water cement ratio 40 to 65%. At this time, when adding an aqueous liquid admixture (such as an admixture aqueous solution or an emulsion organic binder), the amount of water contained in the aqueous liquid admixture added to the heavy polymer cement mortar is also taken into account. To do. If the water cement ratio is less than 40%, it is difficult to apply to the concrete surface with a thickness of less than 1 mm, and if it exceeds 65%, there is a high possibility that the mortar peels, peels, droops or deforms. The weight polymer cement mortar of the present invention has a water cement ratio of 45 to 60% because it is easy to apply to the concrete surface with a thickness of less than 1 mm and the mortar is less likely to peel, peel off, sag and deform. It is preferable to use it after kneading, and it is more preferable to use it after kneading with an amount of water that makes the water cement ratio 47 to 56%.

  The method of kneading with water is not particularly limited, for example, a method of adding and kneading the entire weight polymer cement mortar composition of the present invention to water, and a method of kneading and adding the weight polymer cement mortar composition of the present invention to water while kneading. , A method of kneading all the water in the weight polymer cement mortar composition of the present invention, a method of adding water to the weight polymer cement mortar composition of the present invention while kneading and further kneading, water and a weight polymer cement mortar composition of the present invention There is a method in which a part of each product is kneaded into two or more parts, and the kneaded ones are further kneaded. Moreover, although the apparatus and kneading apparatus used for kneading are not particularly limited, it is preferable to use a mixer because a large amount can be kneaded. The mixer that can be used may be a continuous mixer or a batch mixer, such as a pan concrete mixer, a pug mill concrete mixer, a gravity concrete mixer, a grout mixer, a hand mixer, and a plaster mixer.

3000 g of polymer cement mortar having a blending ratio shown in Table 1 was prepared. In preparation, all the materials were put into a container of a mixer (model: N-50) manufactured by Hobart and mixed at a low speed for 3 minutes. The materials used at this time are shown below. The aggregate is shown in detail in Table 2. Table 1 also shows the amount of organic binder (in terms of non-volatile content) and water cement ratio (considering the amount of water contained in the aqueous liquid admixture) with respect to 100 parts by mass of the polymer cement mortar shown in Table 1. It was shown in 3.
The specimen preparation and kneading were all performed at 20 ° C., and the test was performed after the temperature of the material used was set to 20 ° C.

<Materials used>
Cement: Early strong Portland cement (manufactured by Taiheiyo Cement Co., Ltd.) (Code: C)
Organic binder: Ethylene / vinyl acetate copolymer emulsion (trade name “Moltop Emulsion”) (manufactured by Taiheiyo Materials Co., Ltd., nonvolatile content: 45 mass%) (symbol: P)
Antifoaming agent: (trade name “Adecanate B-317F”) (manufactured by ADEKA Corporation) (symbol: AF)
Organic thickener 1: hydroxypropyl methylcellulose (manufactured by Shin-Etsu Chemical Co., Ltd.) (symbol: TH1)
Organic thickener 2: Starch ether (sales by BASF Japan) (symbol: TH2)
Expansion material: Lime-based expansion material (manufactured by Taiheiyo Materials Co., Ltd.) conforming to JIS A 6202 “Expansion material for concrete” (symbol: EX)
Nylon fiber: Fiber length: 5 mm, fiber diameter: 28 μm (symbol: FB)
Aggregate 1: Crushed rock (specific gravity; 3.2) (Symbol: S1)
Aggregate 2: Crushed rock (specific gravity: 3.2) (Symbol: S2)
Aggregate 3: Crushed stone (specific gravity; 4.1) (Symbol: S3)
Aggregate 4: Clastic rock crushed sand (specific gravity; 4.1) (symbol: S4)
Aggregate 5: Mixed rock of granite and peridotite (specific gravity: 3.6) (symbol: S5)
Aggregate 6: Crushed rock (specific gravity; 3.2) (Symbol: S6)
Aggregate 7: Crushed rock (specific gravity; 4.1) (Symbol: S7)
Aggregate 8: Crushed rock (specific gravity; 4.1) (Symbol: S8)
Aggregate 9: Silica sand (specific gravity; 2.6) (symbol: S9)
Aggregate 10: Iron ore stone (specific gravity; 5.2) (symbol: S10)
Water: Tap water (Symbol: W)

  As a quality test of the produced polymer cement mortar, as shown below, a consistency test, a coating test, a dry unit volume mass test, and an adhesion strength test were performed, and each polymer cement mortar was evaluated. The results are shown in Table 4.

<Quality test method>
Consistency test JIS R 5201-1997 “Cement physical test method” According to the flow test, the flow value immediately after mixing was measured.

Application test Heavy concrete test plate simulating a step of several millimeters of heavy concrete (60 × 40 × 6 cm, step: 5 mm, width of recess: 5 cm, length of recess: 40 cm, cross-sectional shape of recess: right triangle ) Was produced. The test plate was fixed to a vertical wall, and the prepared polymer cement mortar was applied with a hammer so that the surface was smooth. At this time, the mortar thickness was set to 2 mm or less in the portions other than the concave portions of the mortar-coated surface (60 × 40 cm) of the test plate. The test plate coated with this polymer cement mortar and repaired the level difference was cured for 28 days under the condition of room temperature 20 humidity 60%. FIG. 1 shows a schematic cross-sectional view of a heavy concrete test plate. FIG. 2 shows a schematic cross-sectional view of a heavy concrete test plate coated with polymer cement mortar and repaired in level.

The evaluation of the coating test was as follows.
[Step repairability]
○: 5 mm step repair was possible.
×: Step repair of 5 mm could not be performed.
[Thin coating properties]
○: It was possible to apply with a thickness of less than 1 mm.
X: Cannot be applied with a thickness of less than 1 mm.
[Finishability]
○: The surface could be finished smoothly, and no dripping, cracking, dry-out, peeling or floating occurred.
X: The surface could not be finished smoothly, or dripping, cracking, dryout, peeling or floating occurred.

-Dry unit volume-mass test According to JASS 5N T-602 "Dry unit volume mass acceleration test method of concrete", the dry unit volume mass (dry unit volume weight) of the curing material age 28 days was calculated | required.
○: 2.15 kg / L or more (that is, 2.15 t / m ³ or more)
X: Less than 2.15 kg / L (ie, less than 2.15 t / m ³ )

-Adhesion strength test It was performed according to JIS A6916 "A foundation adjustment coating material for construction" 7.13 adhesion strength test.
○: 1.0 N / mm ² or more ×: Less than 1.0 N / mm ²

Formulation No. corresponding to the examples of the present invention. Each of the polymer cement mortars 1 to 5 exhibits excellent performance in any of the step repairability, thin coatability and finishability in the coating test, and the dry unit volume mass is 2.15 kg / L or more. The adhesion strength was 1.0 N / mm ² or more, and the overall evaluation was “◯” (pass).
Formulation No. corresponding to a comparative example. Since the polymer cement mortar of 6-14 was “x” (bad) in any item, the overall evaluation was also “x” (failed).

1 Heavy concrete test plate 2 Step 3 Recess 4 Recess 4 Mortar thickness 5 Polymer cement mortar 6 Recess width

Claims (5)

(A) For 100 parts by mass of cement,
(B) The content ratio of particles having a particle diameter exceeding 0.6 mm is 5% by mass or less, the content ratio of particles having a particle diameter of 0.15 to 0.3 mm is 40 to 60% by mass, and the specific gravity is 3.0 to 4. 180 to 400 parts by mass of the aggregate of .5
(C) 3 to 25 parts by mass of an organic binder,
(D) A weight polymer cement mortar containing 0.3 to 7 parts by mass of an antifoaming agent and (E) 0.05 to 0.5 parts by mass of an organic thickener.   2. The heavy polymer cement mortar according to claim 1, wherein the content of particles having a particle diameter of less than 0.15 mm in the (B) aggregate is 20 to 40% by mass. Furthermore, for 100 parts by mass of cement,
(F) 1 to 7 parts by mass of an expanding material,
And / or (G) The weight polymer cement mortar of Claim 1 or 2 containing 0.2-0.5 mass part of nylon fibers.   The weight polymer cement mortar according to any one of claims 1 to 3, wherein the dry unit volume mass is 2.15 kg / L or more.   In the (B) aggregate, the content of particles having a particle diameter exceeding 0.3 mm is 30% by mass or less, the content of particles having a particle diameter exceeding 0.6 mm is 5% by mass or less, and the particle size is 0.15 to 0. 2. The aggregate having a content of 3 mm particles of 40 to 60% by mass, a content of particles having a particle diameter of less than 0.15 mm of 20 to 40% by mass, and a specific gravity of 3.0 to 4.5. The heavy polymer cement mortar according to any one of -4.