JP2009263146A - Adhesive composition between mortar layers and repairing method of concrete - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an adhesive composition between mortar layers which does not inhibit the hydration of cement in mortar or mortar blended with a polymer and which does not cause peeling between the layers of a mortar composition and to provide a repairing method of concrete. <P>SOLUTION: In the repairing of existing concrete in which an adhesive for jointing is coated on the existing concrete, a mortar or a mortar blended with a polymer is coated as undercoating, a reinforcing net material is attached and then a mortar or a mortar blended with a polymer is coated, the adhesive composition between the mortar layers composed of an epoxy resin, a water-dispersible polyamine-epoxy adduct, hydraulic cement and a polyolefin-based pulp-like material is coated on the surfaces of the reinforcing net material and the undercoated mortar or the mortar blended with the polymer. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

 The present invention is a mortar interlayer adhesive composition used for repairing a reinforced concrete building or structural member, or a secondary product made of concrete. Specifically, an adhesive for jointing is applied to existing concrete, and an undercoat is applied. A mortar interlayer adhesive composition to be used in the renovation of existing concrete after applying a mortar or a polymer-containing mortar, affixing a reinforcing netting material, and a mortar or polymer-containing mortar, and the mortar interlayer adhesive composition It is related with the concrete renovation method which uses the.

  Conventionally, rehabilitation of waterways, which are secondary products made of concrete used for reinforced concrete buildings and structural members, agricultural waterways, etc., is a glass cover on the walls of buildings as a cover method to prevent cracks in the walls of buildings. As an adhesive for adhering a textile fabric coating base material, and then applying the coating material to the surface of the pasted base material, and sticking the glass fiber coating base material to the wall of the building , Solvent solution type adhesive using thermoplastic resin or thermosetting resin, aqueous solution type adhesive, aqueous dispersion type adhesive, and inorganic adhesives such as cement can be used, and glass fiber coating adhered to the wall It is disclosed that organic, inorganic, emulsion, water-based, solvent-based coating materials, emulsion paints, and resin-containing cement-based coating materials can be used as the coating material to be applied to the surface of the base agent (patent) Literature ).

  In addition, as a method of repairing the outer wall, which is an inorganic hardened material, an intermediate coating mortar composition in which synthetic resin is mixed is applied to the entire repaired part, and a mesh material that reinforces the inorganic hardened material is spotted and pressed. There is disclosed a refurbishing method comprising applying a top coat mortar composition having moisture permeability after embedding a material (Patent Document 2).

  Further, the same step as the base coating step is performed, in which a resin-based aqueous adhesive is applied to the surface of the base concrete, and after the resin-based water-based adhesive is dried, a mortar containing a vinyl acetate-ethylene copolymer emulsion is applied. Reinforcing process for stretching a glass fiber net on the ground coating surface coated in the ground coating process, and vinyl acetate-ethylene copolymer emulsion on the glass fiber net stretched in the reinforcing process A repair method comprising a finish coating step of coating the mortar contained is disclosed (Patent Document 3).

  However, in the methods disclosed in these Patent Documents 1 to 3, as a cross-sectional structure of the coating material formed on the existing concrete surface, a glass fiber mesh material is interposed in a layered manner in the mortar composition. Thus, the mortar composition causes a cross-sectional defect in the glass fiber net material portion, and as a result, the glass fiber net material portion becomes weak in strength. For this reason, for example, expansion fracture occurs on the surface of the concrete structure due to an alkali aggregate reaction inside the concrete structure, and a strong force in the bending direction is applied to the integrally formed composite of the mortar composition and the glass fiber net. When added, there is a problem that delamination of the mortar composition occurs in the glass fiber net material portion.

  On the other hand, as a method of transferring new concrete or mortar to the ground such as existing concrete or mortar, it contains an epoxy resin and a polyamine curing agent, or an epoxy resin, a polyamine curing agent, a polysulfide polymer, and a tertiary A method is disclosed in which a primer composition containing an amine compound and blended with 0.1 to 0.6 equivalent of a polyamine curing agent with respect to 1 equivalent of an epoxy resin is applied to an existing concrete surface (Patent Document 4). Patent Document 5).

  However, polyamine curing agents may inhibit hydration of the mortar applied as the undercoat and the mortar applied as the overcoat. In the refurbishment of concrete according to the present invention in which the adhesiveness is insufficient and mortar is applied to the existing concrete surface as an undercoat, and then the mortar is further applied as an overcoat through a reinforcing netting material, the undercoat is applied. The undercoat mortar is in a wet state due to the inability to dry sufficiently, and an unhydrated part may remain, and even if the primer composition is applied to the mortar, The top coat mortar did not adhere sufficiently, and there was a problem in that delamination of the mortar composition occurred at the reinforcing mesh material portion.

  Similarly, when new concrete is handed over to hardened concrete, acrylic ester monomer units, methacrylic ester monomer units, and styrene monomers are used as dispersoids on the joint surface of the hardened concrete. A polyvinyl alcohol polymer containing a homopolymer or copolymer consisting of at least one monomer unit selected from units and diene monomer units, and having a mercapto group at the terminal as a dispersant; The cement mortar joint material composed of an aqueous emulsion is applied to the joint surface, and the new concrete is controlled by preventing the moisture of the newly placed concrete from moving to the existing concrete side due to the high alkali resistance of the coating. It has been disclosed to improve the adhesive strength (Patent Document 6).

However, when mortar is spliced by this method, if the surface of the existing concrete is wet, the coated aqueous emulsion is not sufficiently formed, and if a new mortar is cast in that state, Insufficient part becomes a fragile layer, the adhesiveness of the mortar at the joint is reduced, and after applying the mortar to the existing concrete surface as the undercoat as above, the reinforcing mortar is interposed in layers to form the mortar as the overcoat In the renovation of concrete according to the present invention, the undercoat cannot be sufficiently dried, so that the mortar of the undercoat is in a wet state. Even if the emulsion is applied to the mortar, the undercoat The mortar of the mortar and the mortar of the overcoat do not adhere sufficiently, and there is a problem that delamination of the mortar composition occurs in the reinforcing mesh part. .
JP 59-72349 A Japanese Patent No. 2913275 Japanese Patent No. 3749833 JP 2000-273354 A JP 2000-345101A Japanese Patent Laid-Open No. 6-184489

  The problem of the present invention is that the mortar applied as the undercoat or the polymer-containing mortar is insufficiently dried or not sufficiently hydrated and solidified, The mortar or polymer blended mortar to be applied as a top coat and the mortar composition that is applied as a top coat can be firmly bonded and integrated as a mortar composition in which the reinforcing mesh material is interposed in layers, the surface of the existing concrete Mortar interlayer adhesive composition and concrete refurbishing method in which delamination of mortar composition does not occur at reinforcing mesh material portion even when strong force in bending direction is applied to mortar composition integrated due to expansion failure Is to provide.

The inventors of the present invention have studied the above problems, and the invention according to claim 1 is characterized in that an adhesive for jointing is applied to existing concrete, mortar or polymer-containing mortar is applied as an undercoat, and a reinforcing netting material is used. A mortar interlayer adhesive composition that is applied to the surface of a mortar or polymer-containing mortar that has been applied as a reinforcing netting material and undercoat in the renovation of existing concrete that has been applied and then applied with mortar or polymer-containing mortar. A mortar interlayer adhesive composition comprising an epoxy resin, a water-dispersible polyamine epoxy adduct, a hydraulic cement, and a polyolefin resin-based pulp-like substance, and drying a mortar or a polymer-containing mortar applied as a primer Even if the coating is insufficient or is not sufficiently hydrated and solidified, The mortar applied to the mortar, the mortar to be applied as an overcoat, or the polymer blended mortar are firmly bonded to each other, and the mortar composition in which the reinforcing mesh is interposed in a layered form can be integrated. Mortar interlayer adhesion that does not cause delamination of the mortar composition in the reinforcing mesh material even if a strong force is applied in the bending direction to the integrated mortar composition caused by expansion failure on the surface of the existing concrete It becomes a composition.

  The invention according to claim 2 is the mortar interlayer adhesive composition according to claim 1, wherein the water-dispersible polyamine epoxy adduct is in an amount that reacts with (A) polyamine with 10 to 50% of the primary amino group of the polyamine. 0.25-4 parts by weight of a water-compatible polyamine-epoxy adduct formed by addition and reaction of a mixture of a monoepoxide and a polyepoxide in an amount that reacts with 5-65% of the residual primary amino groups of the polyamine and ( B) 1 part by weight of a resin-compatible polyamine-epoxy adduct obtained by reacting a polyamine having a primary amino group with a monoepoxide or polyepoxide, and at least 25% of the residual amino groups of the polyamine react with formaldehyde. The aqueous phase wherein the polyamine is subsequently at least partially neutralized by reaction with an acid A mortar interlayer adhesive composition characterized by being a mixture of a compatible polyamine-epoxy adduct and the resin-compatible polyamine-epoxy adduct, and the mortar applied as a primer or the polymer-containing mortar was not sufficiently dried. Even if it is not sufficiently hydrated and solidified, the mortar applied as the undercoat, the reinforcing netting applied thereto, and the mortar or polymer blended mortar applied as the overcoat Can be integrated as a mortar composition in which a reinforcing mesh is interposed in a layered manner, and expansion failure occurs on the surface of existing concrete, and a strong force is applied to the integrated mortar composition in the bending direction. Also, a mortar interlayer adhesive composition in which delamination of the mortar composition does not occur in the reinforcing mesh material portion.

  The invention according to claim 3 is a method of applying an adhesive for joining to existing concrete, applying a mortar or a polymer blended mortar as an undercoat, and applying the reinforcing mortar or a polymer blended mortar surface as a primer. A concrete refurbishing method characterized in that the mortar interlayer adhesive composition according to claim 1 or 2 is applied, and a mortar or a polymer-containing mortar is applied in contact with the mortar interlayer adhesive composition. Even if the applied mortar or polymer-containing mortar is not sufficiently dried or not sufficiently hydrated and solidified, the mortar applied as a primer and the reinforcing netting applied thereto And a mortar composition in which a mortar to be applied as a top coat or a polymer-containing mortar is firmly bonded, and a reinforcing netting material is interposed in layers Even if a strong force in the bending direction is applied to the integrated mortar composition due to expansion failure on the surface of the existing concrete, delamination of the mortar composition occurs in the reinforcing mesh material part. Provide a method for concrete renovation.

  The mortar interlayer adhesive composition of the present invention is obtained by applying an adhesive for joining to existing concrete, applying a mortar or a polymer-containing mortar as an undercoat, affixing a reinforcing netting material, and then mortar or a polymer-containing mortar. A mortar interlayer adhesive composition to be applied to the surface of mortar or polymer-containing mortar applied as a reinforcing netting material and undercoat in the renovation of existing concrete coated with an epoxy resin and a water-dispersible polyamine epoxy adduct A mortar interlayer adhesive composition characterized by comprising a water-soluble cement and a polyolefin resin pulp-like substance, wherein the water-dispersible polyamine epoxy adduct is (A) polyamine and 10 to 50% of the primary amino group of the polyamine. The amount of monoepoxide that reacts with 5 to 65% of the residual primary amino groups of the polyamine Reaction of 0.25 to 4 parts by weight of a water-compatible polyamine-epoxy adduct formed by adding and reacting a mixture with a reactive amount of polyepoxide and (B) a polyamine having a primary amino group and a monoepoxide or polyepoxide And 1 part by weight of a resin-compatible polyamine-epoxy adduct obtained by the process, wherein at least 25% of the residual amino groups of the polyamine are reacted with formaldehyde, and the polyamine is subsequently at least partially neutralized by reaction with an acid. It is a mixture of the water-compatible polyamine-epoxy adduct and the resin-compatible polyamine-epoxy adduct, so that it is applied after the mortar or polymer-containing mortar applied as a primer and the reinforcing netting are applied. Mortar or polymer-containing mortar The mortar composition is integrated as a layered mortar composition without hindering the hydration of the tomato, and expansion failure occurs on the surface of the existing concrete in the bending direction. Even if a strong force is applied, there is an effect that delamination of the mortar composition does not occur in the reinforcing mesh material portion.

  In addition, even if the coating surface of the mortar of the undercoat and the top coat to be applied to the existing concrete or the polymer-containing mortar is not a horizontal surface, but a wall shape or a ceiling surface, the mortar interlayer adhesive composition of the present invention does not sag, It can be easily applied to the surface of a mortar or polymer-containing mortar applied as a reinforcing netting material and an undercoat with a roller brush or the like, and there is an effect that workability is extremely good. In particular, after application, the water in the mortar interlayer adhesive composition is rapidly consumed by the hydration of the hydraulic cement in the mortar interlayer adhesive composition, or volatilizes in the air, causing the mortar interlayer adhesive composition to The increase in viscosity is remarkable in a short time. For this reason, it is certain that the mortar interlayer adhesive composition applied to the existing concrete which is not a horizontal upper surface such as a wall shape or a ceiling surface will remain in the region without dripping, and this effect is great. Furthermore, the sagging prevention effect is amplified by blending a polyolefin resin pulp-like substance. The polyolefin resin-based pulp-like substance also has an effect of increasing the cohesive strength of the mortar interlayer adhesive composition itself in which moisture is volatilized, and even if the mortar interlayer adhesive composition is pulled to a newly applied mortar or polymer-containing mortar, The mortar interlayer adhesive composition does not shear and break down due to the polyolefin resin-based pulp-like substance, and the newly applied mortar or polymer-containing mortar does not flow down or fall due to this effect. Therefore, the present invention is a mortar interlayer adhesive composition and a concrete repairing method that are extremely effective when repairing existing concrete that is not a horizontal top surface such as a large wall or ceiling surface.

  In the mortar interlayer adhesive composition of the present invention, as shown in FIG. 1, the adhesive 2 for jointing is applied to the existing concrete 1, the mortar or polymer-containing mortar 3 is applied as the undercoat, and the reinforcing mesh 4 is applied. After pasting, in renovation of existing concrete 1 applied with mortar or polymer blended mortar 6, mortar interlayer adhesion applied to the surface of reinforcing netting 4 and the surface of mortar or polymer blended mortar 3 applied as an undercoat The composition 5 is a mixture of an epoxy resin, a water-dispersible polyamine epoxy adduct, a hydraulic cement, and a polyolefin resin pulp-like substance.

  The epoxy resin according to the present invention may be liquid and can be cured at room temperature, such as bisphenol A type epoxy resin, bisphenol F type epoxy resin, phenol novolac type epoxy resin, bisphenol AD type epoxy resin, biphenyl type epoxy resin, Naphthalene type epoxy resin, alicyclic epoxy resin, glycidyl ester type epoxy resin, glycidyl amine type epoxy resin, heterocyclic epoxy resin, diaryl sulfone type epoxy resin, hydroquinone type epoxy resin and modified products thereof alone or in combination It may be used or liquefied using a diluent. The softening point of the epoxy resin compounded most is preferably 35 ° C. or less. As such a liquid epoxy resin, a liquid bisphenol A type epoxy resin is preferable in terms of versatility and cost.

  Further, the water-based curing agent that is a water-dispersible polyamine epoxy adduct according to the present invention may be any one that can be mixed with the epoxy resin and can disperse water well, and the water-dispersible polyamine epoxy adduct is (A) To polyamine, a mixture of a monoepoxide in an amount that reacts with 10 to 50% of the primary amino group of the polyamine and a polyepoxide in an amount that reacts with 5 to 65% of the residual primary amino group of the polyamine is added and reacted. 0.25 to 4 parts by weight of a water-compatible polyamine-epoxy adduct formed and (B) a resin-compatible polyamine-epoxy obtained by reacting a polyamine having a primary amino group with a monoepoxide or polyepoxide 1 part by weight of adduct, and at least 25% of the residual amino groups of the polyamine A polyamine is a mixture of the water-compatible polyamine-epoxy adduct and the resin-compatible polyamine-epoxy adduct, which is subsequently at least partially neutralized by reaction with an acid, and is disclosed in Japanese Patent No. 2661678. It is described. For the water-dispersible polyamine epoxy adduct corresponding to this, Joliseal JBX-140B (epoxy resin curing agent manufactured by Aika Industry Co., Ltd., trade name, active hydrogen equivalent 380, solid content 33% aqueous solution, viscosity 90 mPas / 23 ° C.) There is.

  The hydraulic component is cement, and the cement is not particularly limited as long as it is hydraulic. Mixed cements such as Portland cement, blast furnace cement, silica cement, fly ash cement, aluminate calcareous cement, silicic acid aluminate calcareous cement, phosphate cement and the like can be used. In particular, white cement, that is, white Portland cement, is preferable in terms of good fluidity. The blending amount of the hydraulic cement is preferably 50 to 250 parts by weight with respect to 100 parts by weight of the epoxy resin, but the effect of the present invention is remarkable, but it is less than 50 parts by weight and more than 250 parts by weight. However, there is no hindrance to the coating workability, the mortar of the base coat and the top coat, or the polymer blended mortar and the reinforcing netting material are integrated, and the mortar interlayer adhesive composition of the present invention on the coated surface is drooped. If the mortar to be applied or the polymer blended mortar does not flow down and fall, the blending amount can be adjusted within the range, and 30 to 300 parts by weight may be blended.

The polyolefin resin-based pulp-like substance is a fibrillated ultrafine fiber of polyolefin-based resin, and a typical product is Chemibest (trade name, Mitsui Chemicals). The product has both hydrophilic and hydrophobic types depending on the raw material of the fiber or post-treatment, both of which are effective, and there are various fiber lengths, but the fiber length is 0.1 mm due to the workability of application with a roller brush. Are preferred. The blending amount of the polyolefin resin pulp-like substance is preferably 5 to 10 parts by weight with respect to 100 parts of the epoxy resin, but the effect of the present invention is remarkable, but less than 5 parts by weight and more than 10 parts by weight. However, there is no hindrance to the coating workability, and the mortar interlayer adhesive composition of the present invention on the coated surface may sag, and the newly applied mortar or polymer-containing mortar may flow down and fall. If not, the blending amount can be adjusted within the range, and 3 to 20 parts by weight may be blended.

  As a mixed form of the blend, an epoxy resin, a water-dispersible polyamine epoxy adduct, water, a hydraulic cement, and a polyolefin resin-based pulp-like substance are main blends. . In other words, epoxy resin, water-dispersible polyamine epoxy adduct, water and polyolefin resin-based pulp-like material, and hydraulic cement are preferable to prevent insufficient mixing / dispersion, deactivation of characteristics, measurement errors and errors. However, you may mix | blend separately.

  The mortar used for the renovation of the concrete of the present invention can be applied to general cement mortar, reinforcing mortar in which short fibers such as vinylon are arbitrarily mixed in cement, aggregate, water reducing agent, polymer blend Mortars include acrylic resin emulsions, ethylene / vinyl acetate copolymer emulsions, multi-component synthetic resin emulsions composed of ethylene, vinyl acetate, styrene, and acrylate esters, SBR latex, epoxy resin emulsions, etc. Formulated mortar can be used.

  In addition, as the reinforcing mesh material, biaxial or triaxial reinforcing mesh material can be used, such as glass mesh, vinylon triaxial continuous fiber sheet, reinforcing carbon fiber sheet, reinforcing aramid fiber sheet, polyethylene mesh, Polypropylene mesh or the like can be used.

In the mortar interlayer adhesive composition of the present invention, a reinforcing netting material is applied to a mortar or polymer-containing mortar applied as an undercoat, and then applied to 0.05 to 0.20 kg / m ² , but 0.1 kg / m. ² is appropriate in terms of coating workability. If it is less than 0.05 kg / m ² , it is difficult to apply uniformly. A coating amount of 0.2 kg / m ² or less can be easily applied with a roller brush.

Hereinafter, it demonstrates in detail in an Example and a comparative example.

  JBX-140A (epoxy resin, trade name, epoxy equivalent 180, solid content 100%, viscosity 1300 mPas / 23 ° C.) 100 parts by weight and Joliseal JBX-140B (Aika Kogyo Co., Ltd. water) Dispersible polyamine epoxy adduct, active hydrogen equivalent 380, solid 33% aqueous solution, viscosity 90 mPas / 23 ° C., 200 parts by weight and polyolefin resin pulp material (Chemibest FDDSS-50, fiber length 0.1 mm, Mitsui Chemicals) 8 parts by weight (trade name, manufactured by Co., Ltd.) and 42 parts of tap water were added to prepare a mortar interlayer adhesive composition containing 150 parts by weight of white Portland cement.

Comparative Example 1
In place of the mortar interlayer adhesive composition shown in the examples, an acrylic emulsion for mixing with mortar (Ultrasol CMX-243, manufactured by Ganz Kasei Co., Ltd., trade name: solid content 45) diluted with water and adjusted to a solid content of 10% % Acrylic acid ester copolymer emulsion) was designated as Comparative Example 1.

Comparative Example 2
In place of the mortar interlayer adhesive composition shown in the examples, 400 parts by weight of an epoxy resin for jointing old and new concrete (Joliseal JB-8A, manufactured by Aika Industry Co., Ltd., trade name: bisphenol A type epoxy resin) and a polyamine curing agent Comparative Example 2 was prepared by mixing 100 parts by weight (Joliseal JB-8B, manufactured by Aika Industry Co., Ltd., trade name: modified aliphatic polyamine) in a stirrer.

Comparative Example 3
In the example, Comparative Example 3 was prepared without applying the mortar interlayer adhesive composition.

  Table 1 shows the results of Examples and Comparative Examples.

Test conditions

Existing concrete base: U-shaped lid defined in JISA 5334 (reinforced concrete U-shaped lid), nominal type 300 (400 x 600 x 60 mm) is used as an existing concrete base, and the central part is cored with a diameter of 100 mm from the back Make a notch with a depth of 55 mm in the front surface direction. Thereafter, the front side was polished with # 80 sandpaper to prepare a specimen base.

Preparation of test body: U-shaped lid, which is the base of the above-mentioned test body, is held vertically with the longitudinal side down and used as an adhesive for splicing, JBX-140A (epoxy resin manufactured by Aika Industry Co., Ltd., trade name) , Epoxy equivalent 180, solid content 100%, viscosity 1300 mPas / 23 ° C. 100 parts by weight and Joliseal JBX-140B (Aika Industry Co., Ltd. water dispersible polyamine epoxy adduct, active hydrogen equivalent 380, solid content 33% aqueous solution, A mixture of 200 parts by weight of a viscosity of 90 mPas / 23 ° C. and a trade name of 150 parts by weight of ordinary Portland cement was applied to the entire front surface of 0.4 kg / m ² . Thereafter, 150 parts by weight of normal Portland cement, 200 parts by weight of cinnabar 5, 100 parts by weight of cinnabar 7, 100 parts by weight of vinylon fiber AB (made by Unitika Co., Ltd., trade name) 0.2 parts by weight, and tap water 70 A mortar mixed with 1 part by weight and 1 part by weight of a high-performance water reducing agent Melflux1641F (trade name, manufactured by BASF Construction) was applied to a thickness of 10 mm. Immediately after the glazing, a vinylon triaxial continuous sheet KVT7226Y (manufactured by Nittobo Co., Ltd., product name) was applied and adhered to the surface of the undercoating mortar with a brush and a candy. After then left for 2 hours, Example, mortar interlaminar adhesion composition 0.1 kg / ^{m 2} in Comparative Example 1, the mortar interlayer adhesive composition of Comparative Example 2 are given a coating of 0.3 kg / ^{m 2,} compared In the test body of Example 3, the mortar interlayer composition was not applied at all, and after 30 minutes, a mortar having the same composition as the undercoat mortar was applied as a top coat mortar to a thickness of 10 mm and cured at 23 ° C. for 28 days to obtain a test body. .

Test method: The test conformed to the Japan Highway Public Corporation Standard JHS424: 2004 Peel-off Punching Test. Specifically, with the back side of the above-mentioned test body as the upper side, 200 mm on both sides centered on the center of the longitudinal surface is supported on a gantry parallel to the direction perpendicular to the longitudinal direction, and an iron jig (diameter 100 mm × high 100 mm) is set, and first, a steel jig is used at a speed of 1 mm / min until the thin circular part at the center of the U-shaped lid (the deepest part of the notch and the front surface of the U-shaped lid) breaks. To be loaded. Next, the loading was continued at a speed of 5 mm / min, a push-out test was performed on a core part having a diameter of 100 mm, the maximum load was measured, and the destruction state of the top coat mortar and the undercoat mortar was visually observed.

Evaluation methods

Punching maximum load: In the above punching test, the maximum load is evaluated as ◯ when the maximum load is 6.0 KN or more, Δ when 3.0 KN or more and less than 6.0 KN, and × when less than 3.0 KN.

Breaking condition: The U-shaped lid, the undercoat mortar, the reinforcing netting material, and the topcoat mortar are integrated and bonded, and the layer between the topcoat mortar and the undercoat mortar has no peeling failure. The ones that were peeled and broken by were marked with x.

Topcoat mortar state: Hold the sample vertically to make a test specimen. After coating the topcoat mortar to a thickness of 10 mm, hold the state and mark it as ○ when there is no shift or drop. X was defined as x.

Summary of test results: The mortar interlayer adhesive compositions of the examples have a maximum punching load of 6.0 KN or more, and no peeling occurs between the undercoat mortar and the topcoat mortar, and the topcoat mortar is a mortar interlayer adhesive composition. Even when applied in contact with the film, it did not slip or fall.

The adhesive 2 for jointing is applied to the existing concrete 1, the mortar or polymer blended mortar 3 is applied as an undercoat, the reinforcing netting 4 is applied to the surface, and the mortar interlayer adhesive composition according to the present invention is applied. It is a cross-sectional state figure which shows the state which applied 5 and also applied the mortar or the polymer mixing | blending mortar 6. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Existing concrete 2 Adhesive for joining 3 Mortar or polymer combination mortar 4 Reinforcement netting material 5 Mortar interlayer adhesive composition 6 Mortar or polymer combination mortar

Claims (3)

  Applying adhesive for jointing to existing concrete, applying mortar or polymer blended mortar as an undercoat, applying reinforcing netting, and then applying existing mortar or polymer blended mortar A mortar interlayer adhesive composition to be applied to the surface of a reinforcing netting material and a mortar or polymer-containing mortar applied as an undercoat, comprising an epoxy resin, a water-dispersible polyamine epoxy adduct, a hydraulic cement, and a polyolefin resin-based pulp A mortar interlayer adhesive composition comprising a substance   The water-dispersible polyamine epoxy adduct reacts with (A) polyamine in an amount that reacts with 10 to 50% of the primary amino groups of the polyamine and 5 to 65% of the residual primary amino groups of the polyamine. 0.25-4 parts by weight of a water-compatible polyamine-epoxy adduct formed by addition reaction of a mixture with a quantity of polyepoxide and (B) obtained by reacting a polyamine having primary amino groups with a monoepoxide or polyepoxide. And 1 part by weight of a resin-compatible polyamine-epoxy adduct, wherein at least 25% of the residual amino groups of the polyamine are reacted with formaldehyde, and the polyamine is subsequently at least partially neutralized by reaction with an acid. The water-compatible polyamine-epoxy adduct and the resin-compatible polyamine-e Mortar interlayer adhesive composition of claim 1 wherein the a mixture of Kishiadakuto Claim 1 or Claim 2 to the mortar or polymer compounding mortar surface which apply | coated the adhesive for jointing to the existing concrete, apply mortar or polymer combination mortar as the undercoat, and apply | coat the reinforcing netting material and the primer as the undercoat. A concrete refurbishing method comprising: applying a mortar interlayer adhesive composition, and applying a mortar or a polymer-containing mortar in contact with the mortar interlayer adhesive composition

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