JP6947527B2 - Curable composition and repair material - Google Patents

Description

The present disclosure relates to curable compositions and repair materials.

Since concrete structures have the advantages of high strength, excellent workability, and low cost, many concrete structures have been built in Japan, mainly during the high-growth period. Concrete structures have excellent durability, but after many years of use, carbon dioxide in the atmosphere permeates with moisture, causing neutralization, and chloride ions contained in sea breeze and antifreeze droplets permeate. As a result, it may corrode and expand, causing cracks. The concrete pieces may come off from such cracks as a starting point or due to freezing of water that has soaked into the concrete.
Therefore, in order to prevent such peeling of concrete, an inorganic composition such as silicate is used (for example, Patent Document 1 and the like).

Japanese Unexamined Patent Publication No. 2012-106910

However, when a conventional composition is used, a satisfactory and sufficient effect cannot be obtained when the reaction between the silicate and the polyvalent metal ion is insufficient. Therefore, a repair material having excellent water adhesion resistance is required. Has been done.

The present invention has been made in view of the above problems, and provides a curable composition and a repair material capable of improving water resistance as a material suitably used for repairing a concrete structure or the like. The purpose.

The present application includes the following inventions.
(1) With the first component, which is sodium silicate, potassium silicate, lithium silicate, or a mixture thereof,
A second component having pozzolan activity and an electrical conductivity difference of 1.2 mS / cm or more,
A curable composition comprising a third component having an electrical conductivity difference of less than 1.2 mS / cm.
(2) The above-mentioned curable composition in which the second component is metakaolin.
(3) The above-mentioned curable composition in which the third component is at least one selected from pyrophyllite, silica fume and fly ash.
(4) Further, the above-mentioned curable composition containing 3 to 10% by weight of styrene-butadiene rubber as a solid content in the curable composition.
(5) The curable composition according to any one of the above, and
A repair material having a tensile strength of 1 kN / 50 mm or more in at least one direction, and including a multi-axis mesh sheet in which multifilaments are combined.

According to the present invention, it is possible to provide a curable composition and a repair material capable of improving the water adhesion resistance.

[Curable composition]
The curable composition of the present application mainly comprises.
With the first component, which is sodium silicate, potassium silicate, lithium silicate or a mixture thereof,
A second component having pozzolan activity and an electrical conductivity difference of 1.2 mS / cm or more,
Includes a third component with an electrical conductivity difference of less than 1.2 mS / cm.
By preparing a curable composition having such a composition, it can be cured quickly. Further, in the cured product, the water adhesion resistance can be improved, and high strength can be developed / maintained in the initial stage and for a long period of time.

(First component)
The first component includes sodium silicate, potassium silicate, lithium silicate or a mixture thereof.
In the curable composition, curing of sodium silicate, potassium silicate, lithium silicate or a mixture thereof is carried out by inducing a dehydration reaction and forming a Si—O bond. The dehydration reaction can be accelerated by moving the pH to near neutral. Further, by replacing the alkali metal of sodium silicate, potassium silicate, lithium silicate or a mixture thereof with a metal having a divalent value or higher, it is possible to form a Si-O-metal-O-Si bond and promote curing. Is.

Sodium silicate, potassium silicate, lithium silicate or a mixture thereof may contain any one of them in the curable composition, but may contain three of them. Of these, sodium silicate is preferably contained from the viewpoint of price and availability.
Sodium silicate, potassium silicate, lithium silicate or a mixture thereof, that is, alkali metal silicate is generally _{represented by the molecular formula of M 2} O · nSiO ₂ · mH ₂ O, and n is in the range of 0.5 to 4.0. Means a composition and a mixture thereof. As the first component, n is preferably 0.7 to 3.0, more preferably 1.0 to 2.0.

It is usually preferable to use sodium silicate, potassium silicate, lithium silicate or a mixture thereof in the form of an aqueous solution because of its ease of handling. For example, it can be prepared using commercially available water glass, sodium silicate, potassium silicate, lithium silicate or a mixture thereof. In particular, it is easy to make adjustments using JIS standard (K1408) Nos. 1 to 3 sodium silicates, No. 4 sodium silicates, and sodium metasilicates 1 and 2. n can be arbitrarily adjusted by mixing these commercially available alkali silicates with alkali metal hydroxides such as sodium hydroxide, potassium hydroxide, lithium hydroxide and the like. As the alkali metal hydroxide, either a solid substance or an aqueous solution can be used.

The aqueous solution of sodium silicate, potassium silicate, lithium silicate or a mixture thereof may be contained in an amount of, for example, 30 to 80 parts by weight and 35 to 75 parts by weight when the whole composition is 100 parts by mass. Is more preferable. The aqueous solution in this case includes, for example, an aqueous solution converted to 10 to 60% by weight, preferably an aqueous solution converted to 15 to 50% by weight, and more preferably an aqueous solution converted to 20 to 40% by weight.

(Second component)
The second component is a substance having pozzolanic activity. In particular, when a geopolymer is used, the pozzolan active substance preferably has an electrical conductivity difference of 1.2 mS / cm or more. By setting such an electric conductivity difference, the reactivity with the silicate aqueous solution can be sufficiently ensured, and the adhesive strength between the repair material and the object, for example, the concrete structure can be enhanced. The difference in electrical conductivity here is an index related to the reactivity of the pozolan active substance induced by sodium silicate, potassium silicate, lithium silicate or a mixture thereof, and is a saturated calcium hydroxide aqueous solution obtained by an evaluation method described later. It means the difference in electrical conductivity before and after the addition of the pozolan active substance.

Here, the pozzolan active substance is a substance that has almost no hydraulic limeness by itself, but reacts with calcium hydroxide at room temperature in the presence of water to form an insoluble compound and harden. be. For example, silica dust, diatomaceous earth, talc, aerosil, white carbon, kaolin, metakaolin, activated clay, acidic clay and the like can be mentioned. These components may be used in combination of two or more. Of these, metakaolin having an electrical conductivity difference of 1.2 mS / cm or more is preferable. The pozzolan active substance usually has a silica component content of 40% by weight or more when the silica component in the _{pozzolan active substance is converted to SiO 2,} or an alumina component content when the alumina component is converted to _{Al 2} O _3. It is preferably 30% by weight or more.
The pozzolan active substance is usually in the form of a lump or powder, but the pozzolan active substance may be used as it is in the form of a lump or powder. Further, in order to activate it, those whose state has been changed by using a method such as thermal spraying treatment, pulverization classification, or action of mechanical energy may be used.

As a method of thermal spraying, a thermal spraying technique applied to a ceramic coating is applied. Examples of the thermal spraying technique include a plasma thermal spraying method, a high-energy gas thermal spraying method, and an arc thermal spraying method. Preferably, the material powder is melted at a temperature of 2000 to 16000 ° C. and sprayed at a rate of 30 to 800 m / sec to obtain a powder having a ^{specific surface area of 0.1 to 100 m 2 / g.}
Any known method can be adopted as the method for pulverizing and classifying. Examples of crushing include a method using a jet mill, a roll mill, a ball mill and the like. Further, as the classification, a method using a sieve, a specific gravity, a wind force, a wet settling or the like can be mentioned. These means can be used together arbitrarily.
Examples of the method of applying mechanical energy include a method using a ball medium mill, a medium stirring type mill, a roller mill and the like. The mechanical energy to act is preferably 0.5 kwh / kg to 30 kwh / kg in order to minimize the load while appropriately activating.

The content of the second component in the curable composition is, for example, preferably 20 to 75% by weight, preferably 25 to 70% by weight, based on the dry solid content of the cured product obtained from the curable composition. More preferably. Alternatively, the second component is preferably 30 to 100 parts by weight, more preferably 40 to 80 parts by weight, based on 100 parts by weight of the aqueous solution of the first component.

(Third component)
The third component has an electrical conductivity difference of less than 1.2 mS / cm. As described above, by using the substance having pozzolan activity having an electric conductivity difference of 1.2 mS / cm or more and the third component having an electric conductivity of less than 1.2 mS / cm in combination, the first The solid content ratio that reacts with the components of the above can be increased, and the cured product becomes dense, so that the water adhesion resistance can be improved. If an attempt is made to increase the solid content ratio that reacts with the first component only with the second component, the curing time becomes too fast and handling becomes difficult, so that it is difficult to increase the amount to a certain amount or more. Since the third component has a slower reaction than the second component, it has little effect on the curing time of the composition, and the reaction solid content ratio that reacts with the first component can be increased.
As the third component, a substance having pozzolan activity or a substance having no pozzolan activity may be used as long as the electric conductivity difference is less than 1.2 mS / cm. Examples of the third component include pyrophyllite, silica fume, fly ash, kaolin and the like. These components may be used in combination of two or more.

Here, the difference in electrical conductivity is an index related to the reactivity of the pozzolan active substance induced by the alkaline substance, and the pozzolan active substance is described in "Cement Concrete Research, Vol. 19, pp. 63-68, 1989 ”, the electrical conductivity of 200 ml of a saturated aqueous solution of Ca (OH) 2 was measured under the condition of 40 ± 1 ° C., and then 5 g of metacaolin was added, and the mixture was stirred and the electrical conductivity after 2 minutes. Means the difference from the electrical conductivity before charging.

The third component is preferably 20 to 300% by weight, more preferably 30 to 200% by weight, based on the second component. Alternatively, the third component is preferably 20 to 150 parts by weight, more preferably 30 to 100 parts by weight, based on 100 parts by weight of the aqueous solution of the first component.

(Other ingredients)
The curable composition of the present invention may contain additives known in the art in addition to the above components. Examples thereof include curing agents, alkyl silicates, pigments, antioxidants, fillers, modifiers, dispersants, curing time modifiers, polymer emulsions (latex), pozorane active substances, surfactants and the like. Among them, it is preferable to contain latex. These are not particularly limited, and known ones can be used. When these additives correspond to the second component or the third component, they are classified into the above-mentioned components, respectively.

The curing agent is a component for accelerating the curing of sodium silicate, potassium silicate, lithium silicate or a mixture thereof. As described above, the curing agent is preferably adjusted to around pH neutral in order to promote the dehydration reaction. Also, in order to form a Si-O-metal-O-Si bond and promote curing, the alkali metal in sodium silicate, potassium silicate, lithium silicate or a mixture thereof may be replaced with a divalent or higher valent metal. What can be done is preferable. The curing agent preferably contains one or more selected from the group consisting of organic acid esters, dialdehydes, inorganic acid esters, organic acid metal salts, inorganic acid metal salts, metal oxides and metal hydroxides. It is more preferable to use one or more compounds selected from the group consisting of organic acid esters, metal oxides and metal hydroxides.

The organic acid ester has an advantage that the formation of Si—O bond can be promoted by generating an acid in an aqueous solution. Examples of the organic acid ester include carbonic acid ester and acetic acid ester. Of these, triacetin is preferable.
Examples of the dialdehyde include malondialdehyde and the like.
Examples of the inorganic acid ester include esters of nitric acid, hydrochloric acid, sulfuric acid, phosphoric acid and the like, for example, trimethyl phosphate and the like.
Examples of the organic acid metal salt include alkali metals such as formic acid, acetic acid, malonic acid and carbonic acid, and alkaline earth metal salts such as sodium hydrogen carbonate.
Examples of the inorganic acid metal salt include alkali metals such as nitrate, hydrochloric acid, sulfuric acid and phosphoric acid, and alkaline earth metal salts such as magnesium sulfate.
The metal oxide and the metal hydroxide can form a Si—O-metal-O-Si bond by leaching the metal ion, and can cure sodium silicate, potassium silicate, lithium silicate, or a mixture thereof. .. Examples of the metal oxide and the metal hydroxide include magnesium hydroxide, magnesium carbonate, calcium carbonate, calcium hydroxide and the like.

As the curing agent, magnesium hydroxide and magnesium carbonate are preferable from the viewpoint of preventing the curing agent from settling in the composition and from the viewpoint of easily impregnating the glass fiber.

The alkyl silicate has an alkyl group and at least one silicate group [-SiO ⁻ M ⁺ (in the formula, M ⁺ indicates a group capable of forming a monovalent cation)]. Examples of alkyl silicates include mono, di, trialkyl silicates having 1 to 3 carbon atoms and alkali metal salts thereof. Specific examples thereof include sodium hexyl silicate, sodium propyl silicate, sodium vinyl silicate, sodium dimethyl silicate, sodium methyl silicate, potassium dimethyl silicate, and potassium methyl silicate.

Examples of the filler include organic fillers (for example, cellulose, etc.) and inorganic fillers (for example, carbon, mineral fine powder, synthesized inorganic crystal powder, calcium carbonate, etc.) and the like. Examples of the mineral fine powder include slag powder, hard sandstone powder, silica sand powder, zeolite, alumina, zirconia, and silica powder.
Examples of the modifier include various metal salts capable of reacting with an aqueous silicate solution, and examples thereof include light-baked magnesium oxide and zinc oxide.
Examples of the polymer emulsion (latex) include acrylic rubber, styrene-butadiene rubber, and a mixture thereof.
The surfactant may be anionic, cationic or nonionic. Of these, nonionic surfactants are preferable.

These additives can be used in any content as long as the intended action of the curable composition is not impaired. Usually, it is preferably blended in an amount of 10 parts by mass or less. In particular, the polymer emulsion is preferably contained so that the solid content mass of the polymer is 2 to 10% by mass with respect to the total mass of the dry solid content of the curable composition. As a result, the adhesive strength of the cured product of the curable composition can be improved, and the drying shrinkage of the cured product can be suppressed.

[Repair material]
The repair material of the present invention includes the above-mentioned curable composition and a mesh sheet. The mesh sheet may be a single layer, but is preferably a laminated body containing at least one layer of mesh sheet. This repair material can be effectively used especially in the repair of concrete structures.

(Mesh sheet or laminate)
The mesh sheet is preferably a multi-axis mesh sheet in which at least one layer is a combination of multifilaments. The multifilament is preferably composed of long fibers. Further, when it is combined with another mesh sheet to form a laminated body, it does not necessarily have to be a multi-axis mesh sheet in which multifilaments are combined.
Examples of the mesh sheet include those formed of polyester, polyolefin, vinylon, aramid, carbon fiber, glass fiber and the like. Of these, it is preferably made of a vinylon mesh sheet or a glass mesh sheet. As the glass fiber, it is preferable to use glass yarn or roving. The glass yarn is made by twisting glass fibers into a twisted yarn, and the roving is a bundle of glass fibers. Examples of the weaving method of the multi-axis mesh include plain weave, twill weave, entwined weave, and braided cloth. Further, the weaving direction of the multi-axis mesh may be an orthogonal biaxial or more multi-axis woven fabric.

The thickness of the mesh sheet is preferably 0.1 to 1.5 mm, more preferably 0.3 to 1 mm. The mesh sheet is preferably a biaxial woven fabric or a multiaxial woven fabric that is combined in a mesh shape with a mesh spacing of 5 to 25 mm.
The mesh sheet preferably has a basis weight of 50 g / m ² or more, more preferably 60 g / m ² or more, and further preferably 75 g / m ² or more. By setting the basis weight in such a range, it is possible to improve the tensile strength and secure a sufficient proof stress of the repair material without causing breakage when the object piece, for example, the concrete piece is peeled off.

The mesh sheet preferably has a tensile strength of 1 kN / 50 mm or more in at least one direction, and more preferably a multi-axis combination of multifilaments having a tensile strength of 1 kN / 50 mm or more in at least one direction. It is more preferable that the biaxial or triaxial mesh sheet is a combination of the above, having a tensile strength of 1 kN / 50 mm or more in at least one direction and a mesh spacing of 5 mm to 25 mm.
The value X represented by the formula (1) of the laminated body in which the multifilaments are combined in a multi-axis mesh shape is preferably 2.0 or more, and 2.5 or more, 2.8 or more, or 3.0 or more. Is more preferable.
X = A × B (1)
Here, A represents the tensile strength kN / 50 mm in one direction of the mesh sheet or the sheet-shaped member, and B represents the number of axes of the mesh sheet or the sheet-shaped member. A can be set to an arbitrary value by changing the number of multifilaments per 50 mm. B includes those having a range of 2 to 4. Among them, A is preferably 1 kN / 50 mm or more, more preferably 50 kN / 50 mm or more, further preferably 150 kN / 50 mm or more, and B is preferably 2 to 3 or more.
With such a configuration, the mesh sheet can satisfy the function as a load-bearing layer for receiving the concrete pieces falling from the concrete structure.

As the other base material layer, for example, it is preferable to use a sheet-like member. Examples of the shape of the sheet-like member include woven fabrics and non-woven fabrics. Examples of the material include polyester, polyolefin, vinylon, aramid, carbon fiber, glass fiber and the like. Among them, it is preferably composed of polypropylene non-woven fabric or glass non-woven fabric, and more preferably long fiber non-woven fabric. Since the glass non-woven fabric has excellent compatibility with the curable composition, the curable composition easily permeates, and when the curable composition is cured, the repair material can be firmly fixed to the concrete structure. Suitable glass non-woven fabrics include chopped strand mats, glass paper, felt and the like.

When a polypropylene non-woven fabric is used, it is preferable to perform a surface treatment on the fiber surface in order to enhance compatibility with the curable composition.
The thickness of the sheet-shaped member is preferably 0.1 mm or more and 1.0 mm or less, and more preferably 0.15 mm or more and 0.5 mm or less. By setting the thickness in such a range, the function as a reinforcing layer of the mesh sheet can be achieved, and the impregnation amount of the curable composition can be suppressed, which is economically advantageous.

Examples of the form of the mesh sheet and the sheet-like member include those having a flat surface, those having an uneven surface, and those having a large number of holes. Specific examples of the sheet-like member include films, meshes, woven fabrics, knitted fabrics, and non-woven fabrics. Among them, the laminate preferably has a non-woven fabric sheet in addition to the mesh sheet described above. By using the mesh sheet, it can be firmly fixed to the concrete structure, and by using the non-woven fabric sheet, it is easy to adhere to the unevenness of the concrete structure.

When the mesh sheet is configured as a laminate with another base material layer, the laminate may be integrated in advance. By integrating in advance, it is possible to prevent the sheets from being displaced during coating impregnation.
As a method of integration, mechanical fiber entanglement, chemical adhesion and the like can be used, and examples thereof include fluffing, needle punching, chemical bond, thermal bond, water flow entanglement and the like.
The laminated body may have, for example, a two-layer structure, a three-layer structure, four layers or more, and the number of layers can be arbitrarily set.

As a method for impregnating the mesh sheet or laminate of the curable composition, various methods such as coating, spraying, dipping, press-fitting, and vacuum injection can be used. In order to improve workability at the time of impregnation and to prevent dust from adhering to the impregnated sheet and the impregnated sheets from adhering to each other, the front and back surfaces of the impregnated laminate may be covered with a protective film made of resin. This protective film is removed when it is attached to a concrete structure.

As the timing of impregnation, the impregnation may be performed before the affixing to the concrete structure, or the affixing to the concrete structure and the impregnation may be performed at the same time.

The amount of the curable composition impregnated into the mesh sheet or laminate is not particularly limited, and the curable composition is uniformly retained throughout the mesh sheet or laminate, and the mesh sheet or laminate is cured by curing the curable composition. It is preferable to adjust so that the entire laminate can be firmly integrated. For example, the mass ratio of the mesh sheet or laminate: curable composition is preferably about 1: 4 to 1:20, more preferably 1: 4 to 1:15.

[Repair method]
It can be carried out by attaching the above-mentioned repair material to an object, for example, a structure, particularly a concrete structure, and curing the curable composition.
As a method of attaching the repair material obtained by impregnating the laminate with the composition to an object, for example, a concrete structure, a known method can be used. For example, at the time of pasting, it is preferable to press appropriately. Further, it is preferable to remove air bubbles that have entered between the repair material and the object, for example, the surface of the concrete structure. This makes it possible to improve the adhesion between the repair material and the surface of the object to be repaired, for example, a concrete structure. As a method for removing air bubbles, it is preferable to use a roller, a spatula or the like to expel air bubbles to the outside of the repair material.

The method of simultaneously attaching and impregnating the object, for example, the concrete structure is not particularly limited, but for example, A) the mesh sheet or the laminate is adhered to the object, for example, the concrete structure. A method of temporarily fixing with tape or the like and applying and impregnating the fast-curing composition from the surface using a roller, spatula, trowel, brush, etc., B) Applying the fast-curing composition to the surface of an object, for example, a concrete structure. A method of applying with a roller, spatula, trowel, brush, etc., pasting a mesh sheet or laminate on it, and squeezing it with a roller, spatula, etc. to impregnate it. Examples thereof include a method of applying and impregnating the quick-curing composition from above using a roller, spatula, trowel, brush or the like.

Curing of the composition impregnated in the repair material can be performed by maintaining the state in which the repair material is in close contact with the object, for example, a concrete structure. For example, the curing time of the composition is 10 to 180 minutes and can be 20 to 120 minutes. The curing time can be adjusted by adjusting the composition ratio of the composition, the ambient temperature, and the like. When the curing of the composition is completed, the repair material is firmly fixed to the object, for example, the concrete structure, and the repair of the object, for example, the concrete structure is completed. The repair material may be heated for curing, but may be maintained at ambient temperature.
Hereinafter, the curable resin composition and the repair material of the present invention will be described in more detail with reference to examples. The present invention is not limited thereto.

Example 1
Solid content 27% by weight, _{100 g of sodium silicate aqueous solution adjusted to SiO 2} / Na ₂ O (molar ratio) = 1.6, latex (manufactured by Nippon Zeon Corporation, trade name: LX407 F43, styrene-butadiene rubber (solid content 50%) )), 10 g was stirred for 24 hours to obtain an aqueous silicate solution.
80 g of metacaolin (electrical conductivity difference 2.0 mS / cm) as the second component and 65 g of pyrophyllite (electrical conductivity difference 0.4 mS / cm) as the third component are mixed with 110 g of the above silicate aqueous solution. To prepare a curable liquid composition.
In addition, a glass non-woven fabric (grain size 25 g / m ² , thickness 1 mm) is concretely applied to a mesh sheet (thickness: 1 mm, grain size: 100 g / m ^{2, tensile strength 150 kN / 50 mm) made of vinylon multifilament with a mesh spacing of 10 mm.} A fiber sheet in which three layers of sheet-like members are laminated by laminating one sheet on the sticking surface side and one polypropylene non-woven fabric (grain size 30 g / m ^{2, thickness 0.2 mm) on the outermost surface layer on the opposite side.} A laminate was produced.
A repair material for a concrete structure was prepared by impregnating the prepared sheet laminate 300 mm × 300 mm with 100 g of a curable composition. This was attached to a concrete flat plate (JIS A 5371) having a thickness of 300 mm × 300 mm × 60 mm, and allowed to stand in a room at 23 ° C. and 50% RH for 3 days to be cured.

Example 2
As the third component, a curable composition was obtained in the same manner as in Example 1 except that 100 g of silica fume (electrical conductivity difference: 1.0 mS / cm) was used instead of pyrophyllite, and the same as in Example 1. An evaluation sample was obtained.

Example 3
As the third component, a curable composition was obtained in the same manner as in Example 1 except that 100 g of fly ash (electrical conductivity difference 0.5 mS / cm) was used instead of pyrophyllite, and the same as in Example 1. An evaluation sample was obtained.

Example 4
A curable composition was obtained in the same manner as in Example 1 except that the amount of metacaolin as the second component was 65 g and the amount of pyrophyllite as the third component was 145 g, and an evaluation sample was obtained in the same manner as in Example 1.

Example 5
A curable composition was obtained in the same manner as in Example 1 except that latex was not used, with 90 g of metakaolin as the second component and 70 g of fly ash as the third component, and an evaluation sample was prepared in the same manner as in Example 1. Obtained.

Comparative Examples 1 to 6
A curable composition was obtained in the same manner as in Example 1 except that the first to third components were used as shown in Table 1, and an evaluation sample was obtained in the same manner as in Example 1.

<Adhesive strength evaluation>
・ Before immersion in water (initial)
A 40 mm × 40 mm steel adherent was attached to the obtained examples and comparative examples with a two-component epoxy adhesive (trade name: Bond E-250, manufactured by Konishi Co., Ltd.), and a weight having a mass of 1 kg was placed on the sample. The product was allowed to stand for 24 hours in a 50% RH atmosphere at 23 ° C. and cured. After that, a concrete cutter was used to make a notch around the steel adhering material until it reached a flat plate. An adhesion strength test based on JSCE-E545 was performed using a simple single-screw tensile tester (TechnoStar R-10000ND).
・ 10 days after immersion in water (water resistance)
The samples obtained in Examples and Comparative Examples were allowed to stand for 10 days in a state where the whole sample was completely immersed in water at 23 ° C., and then the sample was taken out from the water and allowed to stand for 16 hours in a 50% RH atmosphere at 23 ° C. bottom. After that, the steel adherent was attached, hardened, and cut by the same method as in the initial stage, and the adhesion strength test was performed.

表１の結果から、実施例１〜５に示したように、第１の成分に対して、第２の成分と第３の成分とを組み合わせて用いることにより、初期及びその後の強度に優れた補修材料を得ることができる。

From the results in Table 1, as shown in Examples 1 to 5, by using the second component and the third component in combination with respect to the first component, the initial and subsequent strengths were excellent. Repair materials can be obtained.

Claims (3)

With the first component, which is sodium silicate, potassium silicate, lithium silicate or a mixture thereof,
A second component which have a pozzolanic activity,
And a third component only including,
The second component is metacaolin having an electric conductivity difference of 2.0 mS / cm or more, and is contained in an amount of 65 parts by weight or more and 90 parts by weight or less with respect to 100 parts by weight of the first component.
The third component is at least one selected from pyrophyllite, silica fume and fly ash, and the difference in electrical conductivity and the weight part with respect to 100 parts by weight of the first component have one as the X-axis and the other. A curable composition , which is within the range of the following four points on the XY plane with the Y axis as the axis.
The difference in electrical conductivity is 0.4 mS / cm, 65 parts by weight with respect to 100 parts by weight of the first component.
The difference in electrical conductivity is 0.4 mS / cm, 145 parts by weight with respect to 100 parts by weight of the first component.
The difference in electrical conductivity is 1.0 mS / cm, 65 parts by weight with respect to 100 parts by weight of the first component.
The difference in electrical conductivity is 1.0 mS / cm, 100 parts by weight with respect to 100 parts by weight of the first component. The curable composition according to claim 1 , further comprising styrene-butadiene rubber as a solid content in the curable composition in an amount of 3 to 10% by weight. The curable composition according to claim 1 or 2 ,
A repair material having a tensile strength of 1 kN / 50 mm or more in at least one direction, and including a multi-axis mesh sheet in which multifilaments are combined.