JP2007119301A - Method for repairing polymer cement hardened material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To easily and efficiently perform the repair of a polymer cement hardened material, further, to make crazing, cracking, peeling or the like hard to be generated in a repaired part, and to reduce deterioration in strength and durability. <P>SOLUTION: The method for repairing the chipped part of a polymer cement hardened material obtained by forming a polymer cement material composed of W/O type emulsion comprising cement and a vinyl-based monomer and hardening the same includes: a stage (a) where a repair material obtained by kneading a vinyl-based elastic polymer aqueous solution and a hydraulic material is filled into the chipped part of the polymer cement hardened material, so as to be raised; and a stage (b) where, after the hardening of the repair material, the repair material hardened matter is ground, so as to be shaped. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a method for repairing a polymer cement hardened material, and more specifically, when a polymer cement hardened material used for an exterior finishing material of a building is partially damaged during production or transportation and storage, the missing portion is provided. It is intended for repair methods.

Polymer cement hardeners have various advantages such as tougher and better weather resistance than ordinary cement hardened plates because they contain polymer components in addition to cement, which is a hydraulic inorganic material. is doing.
For example, in Patent Document 1, a polymer cement material that is a cement-containing W / O emulsion composed of vinyl monomer, cement, water, a reverse emulsifier, reinforcing fibers, and the like is extruded into a plate shape, and further press-molded. Techniques for curing and producing polymer cement hardeners are shown.
JP-A-5-246747

In the production of the polymer cement cured material as described above, after forming a concavo-convex shape such as a concavo-convex pattern on the polymer cement molded material by press molding, one of the formed concavo-convex shapes during handling until curing is completed. The part may hit a work tool or manufacturing equipment, and may be missing. Even after curing and curing, some parts may be missing during various processing and handling. During construction and use on buildings, etc., it may break with unexpected external force.
It is difficult to repair the defects that occur in such polymer cement hardeners.
In the case of a normal cement hardening material, it is only necessary to close the defective portion with the cement kneaded material and wait for the cement kneaded material to be hydrated and hardened. The cured product of the cement kneaded material is almost completely integrated with the cement cured material as the main body. In addition, when closing a defect with a cement kneaded material, the surface of the cement kneaded material is stroked or scraped off with a tool such as a trowel or a spatula to shape it to the same unevenness as the original surface shape. You can also keep it.

  However, in the case of polymer cement hardener, the hardened material of cement kneaded material does not fully integrate with the polymer cement hardener, even if the defective part is closed with ordinary cement kneaded material, and it will peel off or leave gaps. . One reason for this is that the cement-kneaded material, which is an aqueous material, does not conform to the surface because the surface of the polymer cement hardener is highly hydrophobic. Due to shrinkage deformation when the cement kneaded material is cured, gaps are formed between the polymer cement cured material and cracks. Depending on the difference in expansion and contraction characteristics between the hardened material of the cement kneaded material and the hardened polymer cement material, cracks may occur or peel off over time after repair.

Therefore, it has been considered to use the polymer cement material itself of the polymer cement hardener as a repair material. However, even if the polymer cement material is embedded in the defective part, it does not cure sufficiently if it is left alone. Carrying autoclave curing to harden the polymer cement material at the repair site is very troublesome and expensive.
The problem of the present invention is that the above-mentioned polymer cement hardener can be repaired easily and efficiently, and cracks, cracks, peeling, etc. are unlikely to occur at the repair site, and the decrease in strength and durability can be reduced. Is to do.

The method of repairing a polymer cement hardener according to the present invention repairs a defective portion of a polymer cement hardener obtained by molding and curing a polymer cement material made of a W / O emulsion containing cement and a vinyl monomer. A method (a) in which a repair material in which a vinyl-based elastic polymer aqueous liquid and a hydraulic material are kneaded is filled in a deficient portion of the polymer cement cured material, and the repair material is cured. And (b) a step of shaving and shaping the repair material.
[Polymer cement hardener]
A polymer cement material made of a W / O emulsion containing cement and a vinyl monomer is molded and cured.

Basically, techniques common to ordinary polymer cement hardeners are applied. Japanese Patent Application No. 2004-117158, Japanese Patent Application No. 2005-082022, and the Japanese Patent Application No. 2004-117158, which have been previously filed by the applicant of the present patent application. The technology described in the document can be applied.
<Polymer cement material>
It includes a W / O emulsion of a polymerizable vinyl monomer and water and cement.
Cement is a material that determines the characteristics such as basic mechanical strength of polymer cement hardener. Normal cement material can be used. Examples thereof include Portland cement, fly ash cement, blast furnace cement, and alumina cement. Multiple types of cement can be used in combination. Usually, 10-40 volume% is mix | blended with respect to the whole quantity of the polymer cement material including all the water and other solid content.

  The vinyl-based monomer is polymerized by a polymerization reaction in the curing and curing step, constructs a skeleton structure of the polymer cement cured material together with the hydrated cement, and improves the properties of the polymer cement cured material. A vinyl monomer is a hydrophobic liquid substance and easily forms a W / O emulsion with water. As specific examples of the vinyl monomer, styrene, divinylbenzene, methyl methacrylate, trimethylolpropane trimethacrylate, unsaturated polyester resin, and the like are useful. 4-10 volume% can be normally mix | blended with a vinyl-type monomer with respect to the whole quantity of polymer cement material. Preferably, it is 5-7 volume%. In order to accelerate the polymerization reaction of the vinyl monomer, a polymerization initiator composed of an organic peroxide, a persulfate or the like can be used in combination.

  The W / O emulsion is also called a water-in-oil emulsion, and is a state in which fine water particles are dispersed in a continuous phase of a vinyl monomer. If water and a vinyl-type monomer are mix | blended and it stirs and mixes, the target W / O emulsion will be obtained. In addition to the vinyl monomer, another oily substance can be blended. In addition to water, other liquid or solid particles may be added. The cement is dispersed as fine solid particles in the W / O emulsion. After preparing the W / O emulsion, other materials such as cement can be mixed, and the emulsification treatment can be performed in a state where other materials are mixed in addition to water and vinyl monomers. .

In order to promote the formation of the W / O emulsion, it is effective to add an emulsifier. Emulsifiers used in conventional emulsion technology can be used. Specific examples include nonionic surfactants such as sorbitan sesquioleate, glycerol monostearate, sorbitan monooleate, diethylene glycol monostearate, sorbitan monostearate, diglycerol monooleate, various anionic surfactants, and cationic interfaces. Examples include activators. The amount of emulsifier used can usually be set in a range of 1 to 3% by volume with respect to the total amount of the polymer cement material.
A cement can be used in combination with an aggregate. As an aggregate, the same material as a normal cement hardening material can be used. For example, if a silica foam, aluminosilica balloon, fly ash balloon, glass foam, or other porous aggregate or lightweight aggregate is used, the cement-based hardened material is easy to handle and is suitable for building exterior materials and the like. . There are also gravel, perlite, shirasu balloon, glass powder, alumina silicate. The aggregate can be blended in an amount of 1 to 50% by volume based on the total amount of the polymer cement material. Preferably it is 10-50 volume%.

In addition to the aggregate, another reinforcing material can be blended. Specifically, there are materials known as so-called cement reinforcing fibers. Examples of the reinforcing fiber include synthetic fibers such as polypropylene fiber, acrylic fiber, vinylon fiber, and aramid fiber, carbon fiber, glass fiber, and pulp. A reinforcing material can be mix | blended in about 0.5-10 volume% with respect to the whole quantity of cementitious material.
In addition, the additive material utilized for manufacture of a normal cement-type hardening material can be combined. For example, a coloring agent etc. are mentioned.
<Preparation of polymer cement material>
What is necessary is just to stir and mix each above-mentioned material and water uniformly. Each material may be stirred and mixed at the same time, or a part of the materials may be stirred and mixed, and then the remaining materials may be added and further stirred and mixed. As a stirring device, a dissolver, a screw line mixer, an ultrasonic homogenizer, a colloid mill, a planetary mixer, a static mixer, a nauter mixer, a ribbon blender, a tumble mixer, a paddle mixer, and the like can be used.

It is effective to knead a material whose viscosity is increased by adding cement or a reinforcing material to the W / O emulsion with a kneading apparatus. As the continuous kneading apparatus, a continuous kneader, a twin screw extruder, or the like can be used.
<Molding and curing of polymer cement material>
The molding technology and curing technology in normal building material manufacturing are applied.
Examples of the molding method include cast molding, extrusion molding, press molding, and injection molding. After obtaining a plate-like molded product by extrusion molding, a plurality of molding techniques can be combined, such as molding a concavo-convex shape on the surface by press molding.

The shape of the polymer cement molded body can be set according to the use of the polymer cement hardener or the required function. Common building materials include flat plates, rods, and columns. There are also bent plate shapes and curved plate shapes. There are those having a concavo-convex pattern on the surface and those having a functional structure such as a through hole or a concave groove.
A polymer cement hardening material is obtained by curing and curing the polymer cement molded body. Basically, a curing and curing apparatus and curing and curing conditions in a normal cement-based cured body manufacturing technique are applied. For example, steam curing, autoclave curing, etc. are adopted. Processing conditions are set so that a skeleton structure can be satisfactorily formed by polymerization of vinyl monomers.

[Shape and use of polymer cement hardener]
The shape and structure of the polymer cement hardener varies depending on the intended use and the required function.
Applications of the polymer cement hardener include the same uses as ordinary cement hardeners. For example, there are building exterior materials and exterior materials. It can also be used for roofing and flooring. It can be used for structural materials and surface finishing materials in various civil engineering structures.
The general shape of the polymer cement hardening material is a flat plate shape such as a rectangle. There are also a bent plate shape and a curved plate shape. Some have polygons other than rectangles or curved shapes.

The polymer cement hardened material can be provided with a concavo-convex shape for decoration, a connection structure for connecting with other members, a detailed shape for performing various functions in use, and the like. For example, in the case of a building exterior material, an uneven pattern is often provided on the entire surface.
[Defects]
The produced polymer cement hardener may have a defect.
The reason for the occurrence of the defective portion is that a part of the polymer cement molded body is missing when the polymer cement material is molded. While the polymer cement molded body is transferred to the curing and curing process, it may collide with tools, handling equipment, etc., and a part thereof may be lost. During curing and cooling, defects may occur due to thermal deformation. While the manufactured polymer cement hardener is subjected to finishing processing or handling such as transportation and storage, a defect may occur due to external force applied. Sometimes it breaks after it is built on a building.

Of these missing parts, if they are parts that are not exposed on the surface in use, or parts that have no problem in strength, they can be left as they are. However, it is necessary to repair the missing parts where the appearance is conspicuous or where the design is required, or where the strength is important or the function is required.
[Repair materials]
A repair material in which an aqueous vinyl-based elastic polymer liquid and a hydraulic material are kneaded.
Basically, materials and manufacturing techniques that are common to repair materials for ordinary cement hardeners are applied.

  The vinyl-based elastic polymer is obtained by polymerizing the same vinyl-based monomer as the vinyl-based monomer used in the polymer cement material, and is excellent in elasticity. A rubber component is blended or copolymerized as a component that imparts elasticity. Conventionally, an elastic resin material used for a building material can be used. If the vinyl monomer composing the vinyl elastic polymer is the same monomer as the vinyl monomer blended in the polymer cement material, or a monomer having a polymerizable or chemical bond In addition, the integral bondability between the repair material cured product and the polymer cement cured material is improved. For example, when styrene is blended in the polymer cement material, a polystyrene-based elastic polymer can be used as the vinyl-based elastic polymer.

Specifically, a repair material obtained by kneading an aqueous SBR latex solution and a hydraulic material including cement and aggregate in a ratio of 1: 3 to 1: 4 can be used. The aqueous liquid may be an aqueous solution, an aqueous dispersion, or an emulsion.
The SBR latex is a styrene-butadiene rubber latex and can take the form of an aqueous emulsion. The SBR latex aqueous liquid is mixed with a hydraulic material including hydraulic cement and aggregate to knead, thereby obtaining a kneaded repair material with high viscosity. Various types of cement and reinforcing fibers similar to the above-described polymer cement material can be appropriately blended in the hydraulic material.

The repair material will dry and harden at room temperature if left alone. Reaction hardening of the SBR latex occurs with the hydration hardening of the hydraulic material.
[Supplying repair materials]
The repair material is buried in the defective portion of the polymer cement hardener described above and raised.
Basically, work tools and work procedures similar to those of repair materials made of ordinary cement kneaded materials can be applied. Specifically, the repair material is closely attached to the surface of the defect portion, filled in the entire defect portion, and the repair material is raised so as to protrude outward from the surface position in the absence of the defect. If the missing part is concave, fill the hole and raise it until it slightly exceeds the surface position of the hole. If the missing part includes a convex shape, it is raised so as to protrude beyond the convex outline.

A plastering iron or spatula can be used as a working tool. Putty material injection gun and discharge tool can be used.
[Shaping repair material cured product]
After the repair material is cured, the cured repair material is shaved and shaped.
In the repair material, moisture contained therein is dried and removed, and hydration hardening of the hydraulic material and reaction hardening of the SBR latex proceed. Although it may take a long time to completely cure, the shaping operation can be started at a stage where it is cured to such an extent that it does not easily deform or collapse even when an external force is applied. The shaping work is easier at the stage where the curing does not progress much. Usually, it is desirable to perform the shaping work in a hardened state that can be shaped manually by using a simple tool or blade. Usually, it is desirable to start and complete the shaping work within one hour after supplying the repair material to the defective part.

As a tool used for the shaping work, a tool that is easy to perform a fine manual operation such as a sword or knife, a tip of a flat-blade screwdriver, or a file is used. Machine tools such as a grinder, a sander, and a rotating grinding tool can also be used. Shaping can be performed while supplying an abrasive such as water to the shaping site.
The shaped shape cuts off a portion of the cured cured material of the repair material that is higher than the original surface shape of the polymer cement cured material, so that the appearance of the defect becomes inconspicuous by integrating with the surrounding surface. It is also possible to make the boundary portion inconspicuous by cutting over the outer peripheral edge of the defective portion up to the surface of the polymer cement hardening material. When the original surface shape of the polymer cement cured material is not flat but has irregularities, the corresponding irregularities can also be formed on the surface of the cured repair material.

[Process after repair]
Once the repair material cured product has been shaped and the defective portion of the polymer cement cured material is repaired, it can be finished in the same manner as a normal polymer cement cured material or used for various applications.
If the surface of the polymer cement hardened material is painted to include the repaired part and its surroundings, the repaired part can be made completely inconspicuous. Differences in surface texture can be eliminated.
The repair material cured product can be basically machined such as cutting and drilling, like the polymer cement cured material. Various types of machining can be applied to the polymer cement hardener including the repair points.

The method for repairing a polymer cement hardener according to the present invention includes filling a repair material in which a vinyl elastic polymer aqueous solution and a hydraulic material are kneaded in a defective portion of the polymer cement hardener, and then curing the repair material. The repaired material that has been cured is shaved and shaped.
As a result, the repaired part of the missing part has no noticeable difference in appearance with the surrounding polymer cement hardener, and there is no cracking or peeling over time, and in terms of mechanical strength and durability. Practically sufficient performance can be demonstrated.

1-2 is a case where it applies to the flat polymer cement hardening material used as an exterior finishing board for the outer wall of a building.
[Polymer cement hardener]
As shown in FIG. 1, the polymer cement hardening material 10 has a flat plate shape such as a rectangle so that the entire outer wall of a building can be formed or a plurality of sheets can be arranged to form the entire outer wall. For example, it is a rectangle of 300 cm in length and 90 cm in width, and the total thickness is 3.5 cm.
The polymer cement hardened material 10 has a sufficient thickness that can constitute the outer wall, and the concavo-convex patterns 12 and 14 are formed on the surface arranged on the outer surface in the construction state. Specifically, the convex pattern part 12 which makes | forms the trapezoid shape which inclined in the shape of a taper from the base to the upper end by the plane quadrangle is arrange | positioned at fixed intervals in front and rear, and right and left. Between each convex pattern part 12, it is the lattice-groove-shaped concave pattern part 14 continuous in front and rear, right and left. Furthermore, although not shown in the drawings, the front end surface forming the quadrilateral of the convex pattern portion 12 is not a flat surface, but irregular irregularities such as a rock surface are formed. In addition, each of the plurality of convex pattern portions 12 is a combination of rocks having different concavo-convex patterns. As a result, the overall appearance of the outer wall on which the polymer cement hardened material 10 has been constructed exhibits an extremely high design appearance, such as a complex uneven pattern like natural rocks cut out in the front, back, left and right. Become.

For the production of such a polymer cement hardener 10, the same technique as that of a normal polymer cement hardener is applied. After the polymer cement material is extruded into a flat plate having a certain thickness, the concave and convex patterns 12 and 14 are formed on the surface of the formed plate by press molding and cured by autoclave curing or the like.
[Repair part]
In FIG. 1, some of the convex pattern portions 12 have a defect portion 18 generated during the manufacturing process and handling. The shape and position of the defect 18 are not constant.
In each defect portion 18, a repair material cured product 22 is embedded and integrally joined. In the figure, in order to make the explanation easy to understand, the outlines of the defect portion 18 and the repaired material cured product 22 are clearly displayed, but the repair was performed and the construction of the polymer cement cured material 10 on the building was completed. In the state, the outer shape of the defect portion 18 and the repair material cured product 22 is hardly noticeable.

[Repair work]
The repair work for obtaining the polymer cement cured material 10 having the above structure will be described.
Repair work proceeds to FIGS. 2 (a) to 2 (c).
As shown in FIG. 2 (a), the trapezoidal convex pattern portion 12 of the concavo-convex pattern formed on the polymer cement hardening material 10 is largely lost to form a defective portion 18.
As shown in FIG. 2B, the repair material 20 is applied or pushed into the defect portion 18 so that the entire defect portion 18 is completely filled with the repair material 20. A part of the material repair material 20 is in a state of rising to the outside of the outline of the convex pattern portion 12 when there is no missing portion 18. The surface of the repair material 20 does not need to be in a smooth state and may be uneven.

If a predetermined time is left in this state, the moisture contained in the repair material 20 evaporates and the cement and the like are hydrated and cured. In addition, the polymer contained in the repair material 20 is integrated with the polymer portion constituting the polymer cement hardening material 10 by chemical bonding. The repair material 20 is strongly joined and integrated with the inner surface of the defect 18. The repair material 20 is cured to become a repair material cured product 22.
As shown in FIG. 2C, the repair material cured product 22 is shaped. Specifically, after the repair material 20 is constructed, the shaping work is performed within one hour. The repair material cured product 22 is cured to such an extent that it is not easily deformed or dropped off, but it is sufficient that the complete curing strength is not exhibited.

The surface of the repair material cured product 22 is scraped off little by little by using a tool such as a sword or a flat-blade screwdriver. The repair material cured product 22 can be scraped off without applying such a large force. The repair material cured product 22 is shaped so as to have the same shape as the original convex pattern portion 12. In the figure, the convex pattern portion 12 has a geometric trapezoidal shape and the surface is expressed flat, but in reality, it has fine irregularities resembling natural rock, so that the cured repair material In the shaping of 22, fine irregularities are expressed in accordance with the surrounding convex pattern portion 12.
When the shaping work of the repair material cured product 22 is completed, the polymer cement cured material 10 as shown in FIG. 1 is obtained. The polymer cement hardening material 10 is sent to the next processing operation. Until the repair material cured product 22 is further sufficiently cured, the next work can be performed after a certain period of time has passed or the curing is advanced by blowing or heating.

  If the entire surface of the polymer cement cured material 10 including the repair material cured product 22 is coated, the cured repair material 22 becomes inconspicuous. Also, differences in characteristics such as surface texture can be eliminated.

The method for repairing the cured polymer cement according to the present invention was specifically carried out, and its performance was evaluated.
[Polymer cement hardener]
20 parts by volume of Portland cement, 55 parts by volume of water, vinyl monomer solution [VMS; vinyl monomer (styrene) and emulsifier (sorbitan monooleate) were mixed so that the volume ratio of the former to the latter was 5: 2. 7 parts by volume of the mixture], 2 parts by volume of reinforcing fiber (polypropylene fiber), and 20 parts by volume of lightweight aggregate (alumina silicate balloon) were blended to prepare a polymer cement material having a specific gravity of 1.1.

The polymer cement material was extruded to prepare a polymer cement molded body having a rectangular plate shape of 2000 mm long × 900 mm wide × 35 mm thick. The polymer cement molded body was press-molded to form the concavo-convex patterns 12 and 14 shown in FIG. 1 and then cured by steam curing to obtain a polymer cement cured material. Curing conditions were kept at 60 ° C. for about 10 hours, then raised to 90 ° C., kept at 90 ° C. for about 9 hours, and then allowed to cool.
[Preparation of repair materials]
An aqueous liquid containing about 20 to 30% by weight of styrene / butadiene copolymer latex and about 70 to 80% by weight of water was prepared. Separately, a hydraulic material composed of ordinary Portland cement and fast-curing cement, silica sand, vinyl acetate / ethylene copolymer, and citric acid was prepared. The aqueous liquid: hydraulic material = 1: 3 was kneaded to prepare a kneaded repair material. This repair material has a specific gravity of 1.1, and the pot life until curing at room temperature is about 40 minutes.

(Characteristic evaluation)
Various strength characteristics were measured for the polymer cement cured material and the bonding material of the polymer cement cured material and the repair material cured product.
<Production of bonding material>
The polymer cement hardening material was cut into a rectangle of 150 × 70 mm to obtain a test body.
The surface of the test specimen was forcibly cut out to form a defect. After sufficiently removing dust and fluff on the surface of the defect, the repair material was rubbed with a spatula to get used to it. On top of that, repair materials were added. Work was done so as not to contain air or create gaps inside. After the repair material was sufficiently cured, it was subjected to an evaluation test.

<Characteristic test>
Normal plane tensile strength: The plane tensile strength was measured according to a conventional method.
Freeze-thaw resistance: After 100 freeze cycles, the plane tensile strength was measured.
Water resistance performance: After maintaining in water at room temperature for 21 days (3 W), the plane tensile strength was measured.
Heat resistance performance: After holding at 80 ° C. for 21 days (3 W), the plane tensile strength was measured.
Warm water resistance performance: After holding for 21 days (3 W) in warm water at 50 ° C., the plane tensile strength was measured.

試験結果によると、ポリマーセメント硬化材に比べて、ポリマーセメント硬化材と補修材硬化物との接合材は、少し強度が低下しているが、建築用外装材に要求される程度の強度は十分に維持していることが確認できた。
＜収縮率＞
補修材を、３１×４２×７０ｍｍのブロック形状に成形して硬化させた。硬化後の寸法を測定して、硬化収縮率を測定したところ、硬化収縮率３．２％以下であった。

According to the test results, the strength of the bonding material between the hardened polymer cement and the cured repair material is slightly lower than that of the hardened polymer cement, but the strength required for exterior building materials is sufficient. It was confirmed that it was maintained.
<Shrinkage rate>
The repair material was molded into a 31 × 42 × 70 mm block shape and cured. When the dimension after hardening was measured and the cure shrinkage ratio was measured, the cure shrinkage ratio was 3.2% or less.

[Repair work]
A polymer cement hardener having a rectangular shape of 300 × 300 mm was prepared, and the concave and convex pattern on the surface was forcibly cut out to form a defect portion. A repair material having the above composition was prepared.
After sufficiently removing dust and fluff on the surface of the defect, the repair material was rubbed with a spatula to get used to it. On top of that, repair materials were added. Work was done so as not to contain air or create gaps inside. According to the shape of the concavo-convex pattern, it was arranged to be slightly larger than the convex pattern part.
After being left for about 18 hours, shaping work was performed. As a tool, a gold saw, a flat-blade screwdriver, a gold file, a cutter, and a carving sword were used. In accordance with the uneven pattern of the polymer cement hardened material, the repair material cured product was shaved little by little and shaped until the difference from the surrounding uneven pattern became inconspicuous. A sword (flat chisel) and a flat-blade screwdriver were suitable for the shaping work.

  After that, when the polymer cement hardened material was painted and finished, there was no difference in appearance between the repaired part and the surrounding area.

  The method for repairing a cured polymer cement according to the present invention is useful, for example, for repairing a cured polymer cement having a concavo-convex pattern formed on an exterior plate material of a building. The appearance of repaired parts is inconspicuous, does not crack or peel over time, can maintain a good appearance over a long period of time, and the mechanical properties are not significantly degraded at the repaired parts. It can demonstrate sufficient performance.

The perspective sectional view of the polymer cement hardening material showing the embodiment of the present invention Expanded cross-sectional view of the main part showing the repair work step by step

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Polymer cement hardening material 12 Convex pattern part 14 Concave pattern part 18 Defect part 20 Repair material 22 Repair material hardened | cured material

Claims (2)

A method of repairing a defective portion of a polymer cement hardening material obtained by molding and curing a polymer cement material made of a W / O emulsion containing cement and a vinyl monomer,
A step (a) of filling a repair material in which a vinyl-based elastic polymer aqueous liquid and a hydraulic material are kneaded in a defective portion of the polymer cement cured material;
A method of repairing a cured polymer cement material, comprising: a step (b) of curing and repairing the repair material after the repair material is cured. The polymer cement material uses styrene as the vinyl monomer,
A repair material obtained by kneading an aqueous liquid of SBR latex, which is a vinyl elastic polymer, and a hydraulic material including cement and aggregate in a ratio of 1: 3 to 1: 4 in the step (a). The method for repairing a cured polymer cement material according to claim 1, wherein:

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