JP2000239631A - Adhesive for concrete and adhesion method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an adhesion for concrete which strongly bonds concrete- based materials or mortar-based materials or different adherends such as concrete and metal, plastic or wood into one piece and an adhesion method of concrete conducted by using the adhesive. SOLUTION: An adhesive for concrete is a copolymer emulsion of vinyl acetate, a higher carboxylic acid, styrene and an acrylate. The adhesive is applied to the surface of concrete and another portion of concrete is poured via the dried film to bond the two portions of concrete. Alternatively, the adhesive is a copolymer emulsion of vinyl acetate, a higher carboxylic acid, styrene, an acrylate and acrylonitrile. The adhesive is applied to the surface of concrete and another portion of concrete is poured via the dried film to bond the two portions of concrete.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an adhesive for concrete for integrally and firmly adhering concrete or mortar (hereinafter referred to as concrete), or concrete and a different material to be adhered such as metal, plastic, wood or the like. The present invention relates to a method for bonding concrete using the adhesive and the adhesive.

[0002]

2. Description of the Related Art Conventionally, joints between concrete or concrete and reinforcing steel, steel frames or embedded anchors,
There is a large and diversified need to integrally bond foreign materials such as plastic and wood for the purpose of integral joining with metal such as anchor bolts, corrosion protection of concrete surfaces, waterproofing, or decorative finishing. Conventionally, a concrete adhesive generally used is an epoxy resin, and the adhesive was applied to a surface to be bonded immediately before placing concrete.

[0003]

The conventional epoxy resin adhesive has a high bonding ability and a wide range of application to metals, plastics, woods, etc., but is inferior in usability and lacks reliability. The fact is that it is not used much.

In other words, after the epoxy resin adhesive is applied to the bonding surface, the concrete must be poured while not yet dried. This is because the adhesive ability is lost when the coated surface (coating film) dries. However, the epoxy resin adhesive has a drying and curing time after application of about 20 minutes to 1 hour as usual, and at most one day or less for specially formulated epoxy adhesives.
It's just a day. In addition, when the temperature is high, such as in summer, the time for drying and curing after the application is reduced to about 1/4.

[0005] Therefore, when the progress of concrete casting and the required time are weighed, in the case of very small or partial construction, in ordinary-scale concrete construction, after the application of the epoxy resin adhesive, Matching the drying rate with the progress of concrete casting is nearly impossible in the process, which is why it is not used except in special cases.

[0006] Even if it is used with a time balance in the process, the difference between before and after the coating operation (coating time) may cause a portion that has not dried yet and a portion that has already dried. Is inevitable as a real problem.
Therefore, even with the same surface to be bonded, it is naturally expected that there will be variations in a part (surface) that is securely bonded, a part that is not bonded at all, or a part that has a weak bonding force. It is undeniable that the reliability of the bonding effect is lacking. However, in concrete structures,
Such uncertainty is simply unacceptable.

Accordingly, an object of the present invention is to provide a dry type in which an adhesive effect is exhibited only after being dried and cured, rather than being influenced by the time required for drying and curing after application to a surface to be adhered. Exposure outdoors and rainwater do not affect the bonding ability, so there is no time constraint between the elapsed time after application to the surface to be bonded and the progress or required time of concrete placement. It is an object of the present invention to provide a concrete adhesive which is excellent in usability, has a wide range of application and a wide range of application conditions, and a method for bonding concrete using the adhesive.

[0008]

According to a first aspect of the present invention, there is provided a concrete adhesive comprising a copolymer of vinyl acetate, higher carboxylic acid, styrene and acrylate. It is an emulsion, which is applied to a bonding surface of concrete, and is poured and bonded through a dried coating film.

The concrete adhesive according to the second aspect of the present invention is a copolymer emulsion of vinyl acetate, higher carboxylic acid, styrene, acrylate, and acrylonitrile, which is applied to the concrete bonding surface.
It is characterized in that concrete is cast and adhered through a dried coating film.

According to a third aspect of the present invention, there is provided a method for bonding concrete, comprising applying an adhesive, which is a copolymer emulsion of vinyl acetate, higher carboxylic acid, styrene, and acrylate ester, to the bonding surface of the concrete, and applying the adhesive. After the film is dried, concrete is poured and adhered through the coating film.

The adhesive for concrete according to the invention described in claim 4 is obtained by applying an adhesive, which is a copolymer emulsion of vinyl acetate, higher carboxylic acid, styrene, acrylate, and acrylonitrile, to the bonding surface of concrete, After the coating film is dried, concrete is poured and adhered through the coating film.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION The concrete adhesive according to the first aspect of the present invention is a copolymer emulsion of vinyl acetate, higher carboxylic acid, styrene and acrylate, which is applied to the concrete bonding surface. Brushing,
Alternatively, concrete is applied by a method such as spraying with a spray, dried and cured, and concrete is cast and adhered.

The copolymer emulsion composed of the above four substances has the following structure:

Embedded image But it is not limited to this. Vinyl acetate, higher carboxylic acids, styrene, acrylates can be polymerized in various orders.

[0014] The adhesive for concrete according to the second aspect of the present invention is similarly a copolymer emulsion with acrylonitrile in addition to vinyl acetate, higher carboxylic acid, styrene, and acrylate ester. It is characterized in that concrete is applied to the surface to be bonded by brushing or spraying with a spray or the like, and concrete is cast and adhered through the dried and cured coating film.

The copolymer emulsion composed of the above five substances has the following structure:

Embedded image But it is not limited to this. Vinyl acetate, higher carboxylic acids, styrene, acrylates, acrylonitrile can be polymerized in various orders.

In short, the concrete adhesive of the present invention is characterized by the adhesiveness of vinyl acetate resin, the softness of acrylic acid ester, the hardness of styrene and acrylonitrile, the water resistance of styrene, the oil resistance of acrylonitrile, and the higher carboxylic acid. This is a product prepared as a copolymer emulsion by blending at an appropriate ratio in order to utilize the characteristics and physical properties exhibited by each monomer resin such as alkali resistance.

The performance of this adhesive for concrete is excellent not only in the bonding of spliced joints between concretes, but also in the adhesive strength to various plastics, metals such as steel, wood, tiles and the like. The progress of the drying and hardening of the concrete adhesive varies depending on the temperature, humidity, ventilation conditions, etc., but is as early as about half a day after application and as long as 1 day.
After a lapse of days, a cured coating film is formed so as to exhibit adhesive strength. Therefore, two days after the application, concrete can be cast in expectation of adhesion in any environment.

The results of the adhesive strength test are shown below. Various types of plastic molded plates, mortars, and iron plates were selected as objects to be adhered to concrete, and the results of tests of the number of days of exposure after application of the adhesive and the change in adhesive strength are shown in Table 1 below. In the test method, the concrete adhesive of the present invention was brush-coated on the surface to be bonded, and then exposed outdoors. Concrete was poured after a predetermined number of exposure days or a predetermined period had elapsed, and the concrete was cured outdoors. Five weeks after the concrete was cast, a tensile test was performed on the bonded surface. The unit of the adhesive strength is kgf / cm ² .

[Table 1]

With respect to the iron plate, the test after one week of exposure was stopped due to the generation of rust during the exposure. Compare the tensile strength of the concrete itself with 20-30 kgf / cm ² with each adhesive strength. Next, claims 3 and 4
The method for bonding concrete according to the invention described in the above is a method using the adhesive for concrete, vinyl acetate, higher carboxylic acid, styrene, a copolymer emulsion of acrylate or vinyl acetate, higher carboxylic acid, Adhesive, which is a copolymer emulsion of styrene, acrylate and acrylonitrile, is applied to the bonding surface of concrete, and after the coating film is dried, concrete is poured through the coating film and bonded. I do.

According to the test results shown in the above [Table 1], when the concrete is poured as early as possible after the adhesive is applied and then dried and hardened, the adhesive strength is large, but the concrete after two months has passed. It can be seen that the adhesive strength is comparable to the setting. Even after 6 months, the adhesive strength is exhibited. Therefore, even in a very large-scale concrete work, the adhesive of the present invention is applied to the bonding surface of a plastic plate also serving as a concrete formwork, or the surface of a reinforcing bar or a steel frame, embedded anchor hardware, anchor bolts, tiles, or the like. There is sufficient time allowance from application to concrete placement. Also, in the case where a beam or a floor slab is connected directly to an underground wall or a column constructed in advance or through a connection metal (shear connector) or the like, the present invention is applied to the joint surface (adhesive surface). It is also possible to easily apply an adhesive in advance, and then assemble the formwork and cast concrete to integrate them.

Examples of the use of the concrete adhesive according to the present invention and embodiments of the bonding method will be described below. A case in which a concrete structure (building body) such as an existing floor or wall or pillar is bonded to a concrete structure such as a pillar, wall, beam or floor to be connected to the existing structure.

An adhesive is applied to the joint surface (joining surface) of the existing concrete structure, and after the coating film is dried and hardened, the joint concrete is cast. For example, the present invention can be applied to, for example, joining of a permanent mountain retaining concrete wall and an underground concrete structure skeleton, joining of columns, and placing wall concrete on floor concrete after a considerable period of time has elapsed in a reverse construction method. Reinforcing steel or steel frames buried in concrete as a concrete reinforcing body, or steel plates buried or driven in in preparation for joining with other structures, form spacers, connection hardware, shear connectors, anchor hardware, anchor bolts, etc. Case that is glued together.

Before placing concrete, rebars, steel frames,
Alternatively, the concrete adhesive of the present invention is applied to the surface of an iron plate, a connection metal (shear connector), an anchor metal, an anchor bolt, and the like, and concrete is poured at an appropriate time after the coating film is dried and cured to be bonded. And integrate them. A case where an iron plate, a plastic plate, a wooden plate, a tile, etc. are integrally driven into a concrete surface for corrosion protection, waterproof treatment, or decorative finishing treatment of the concrete surface.

The object to be bonded is assembled in a form also serving as a mold. Before or after assembly, the adhesive for concrete of the present invention is applied to the adhesive surface of the iron plate, plastic plate, wood plate, tile, or the like, and the coating film is dried and cured. At an appropriate time thereafter, concrete is cast and driven in, and integrated by bonding.

[0025]

According to the present invention, the adhesive effect of the concrete according to the first and second aspects of the present invention is not significantly affected by the time of drying and curing after being applied to the surface to be bonded or the elapsed time thereafter. Rather, it is a dry type that demonstrates its bonding ability only after being dried and hardened, and is exposed outdoors and does not interfere with its bonding ability even if it gets wet with rainwater. There is almost no time constraint between the progress status and the required time, the usability is excellent, and the applicable range and the applicable conditions are wide.

Moreover, this concrete adhesive is excellent in adhesiveness to various plastic plates, steel and other metals, woods, tiles, etc., as well as to the bonding of concrete joints. By performing the bonding method according to the third or fourth aspect of the present invention using an adhesive, various concrete works for bonding can be easily, reliably, properly prepared, and based on high reliability. Can be done, concrete structure quality, performance, design,
It greatly contributes to the improvement of the service life.

Continuation of the front page (72) Inventor Maki Kawazoe 4-4-2, Tokai-cho, Tokai-city, Aichi Prefecture F-term in REO Kaken Corporation (reference) 4J040 DB041 DE021 DF011 DF041 DF081 GA07 GA13 HA126 JA03 JB05 LA05 LA06 LA07 MA02 MA03 MA04 MA08 MA10 NA12 PA44

Claims (4)

[Claims] (1) vinyl acetate, higher carboxylic acid, styrene,
An adhesive for concrete, which is a copolymer emulsion of an acrylate ester, which is applied to an adhesive surface of concrete, and then casts and adheres the concrete through a dried coating film. 2. Vinyl acetate, higher carboxylic acid, styrene,
An adhesive for concrete, which is a copolymer emulsion of acrylic acid ester and acrylonitrile, which is applied to an adhesive surface of concrete, and is poured into and adhered to the concrete via a dried coating film. (3) vinyl acetate, higher carboxylic acid, styrene,
An adhesive which is a copolymer emulsion of acrylic acid ester is applied to the bonding surface of the concrete, and after the coating film is dried, the concrete is cast and bonded through the coating film, and the concrete Bonding method. 4. A vinyl acetate, a higher carboxylic acid, styrene,
An acrylic acid ester, an adhesive which is a copolymer emulsion of acrylonitrile is applied to the bonding surface of concrete, and after the coating film is dried, the concrete is poured through the coating film and bonded, Concrete bonding method.