JPH0254311B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a surface paving method for forming a primer layer that can effectively prevent blistering when concrete structures are paved with polymeric materials. Conventionally, synthetic resin paints such as epoxy resins and urethane resins, long flooring materials such as rubber materials and vinyl chloride, and plastic tiles have been used for paving the concrete surfaces of concrete structures on the interior and exterior surfaces. Generally, when a concrete structure is built in a low water level area, a wetland area, or an area with poor drainage, water in the ground permeates through microscopic pores and cracks in the cement concrete, and a large amount of water enters the underlying concrete of the floor and walls. It is well known that water can be impregnated with water. A similar phenomenon may also occur if poured concrete is insufficiently dried. When a surface paving layer made of the above-mentioned polymeric material is formed on such a base concrete surface,
Moisture impregnated into the base concrete cannot diffuse into the atmosphere. Therefore, when the vapor pressure of water exceeds the adhesive force between the base concrete and the surface pavement layer, blisters, called blisters, occur in the surface pavement layer. These blisters vary in size from about 0.5 mm to 5 to 10 cm, and tend to occur locally. Blisters not only spoil the appearance of the area, but also cause the pavement layer to peel off, so effective countermeasures have been desired. Conventionally, methods for preventing the blister phenomenon have been proposed, such as interposing a porous membrane or cutting grooves to release the vapor pressure of impregnated water, but none of these methods have been sufficient. An object of the present invention is to provide a method for surface paving a concrete structure that can overcome the drawbacks of the prior art as described above and effectively prevent the occurrence of blisters. That is, the present invention is a paving method for forming a surface layer mainly made of a polymeric material on a concrete base surface of a concrete structure via a primer layer, in which an epoxy resin in which water and cement are dispersed is applied to the base concrete surface. It is characterized by forming a primer layer that can be cured to effectively prevent the blister phenomenon. Hereinafter, the effects of this invention will be explained in detail using examples. First, a curing agent is added to a room-temperature curing epoxy resin and thoroughly mixed. After adding and mixing a mixture of cement dissolved in water, the mixture is applied and hardened to a concrete floor surface to form a primer layer (pre-coat base layer). The appropriate thickness of the primer layer is about 0.1 to 1 mm, but it may be thicker. Formation of the epoxy resin layer is similar to conventional epoxy resin painting except that water and cement are dispersed. That is, as the epoxy resin, any of glycidyl ether of bisphenol A, glycidyl ether of bisphenol F, etc. can be used, and as the curing agent, an amine type or the like may be used as appropriate.
Further, the blending ratio of the main agent to the curing agent may be appropriately determined in the usual manner, taking into account the epoxy equivalent and the like. The amount of water mixed into the epoxy resin is
A suitable amount is 2 to 150 parts by weight, preferably 10 to 70 parts by weight, per 100 parts by weight. If the mixing amount is less than 2 parts by weight, a sufficient anti-blister effect cannot necessarily be obtained, while if it exceeds 150 parts by weight, the cured product will contain a large amount of water, resulting in the same result as a lack of water. The appropriate amount of cement to be added is about 5 to 200 parts by weight per 100 parts by weight of the epoxy resin. Further, a filler or the like may be added to the epoxy resin, and the strength can be further improved by adding silica sand, for example. A surface layer mainly made of a polymeric material or the like is formed on this primer layer. This invention effectively prevents the occurrence of blistering by forming a primer layer of epoxy resin in which water is dispersed, which has poor affinity for lipophilic epoxy resins and is generally disliked for adhesion. It is something. The present invention is suitable as a method for paving the surface of a concrete base using a polymeric material, and is particularly suitable as a method for paving the floor of a building in a humid area such as a wetland. Example A concrete plate measuring 30 cm x 30 cm x 5 cm is placed in a container, water is poured into the container so that the concrete plate is submerged by 4 cm, and the container is sealed. A surface layer was formed using the following formulation on the top surface of a saturated concrete plate containing sufficient moisture, and the occurrence of blister phenomenon was evaluated. A Epoxy resin base [1] 80 parts by weight of Epicoat 828 [Bisphenol type A, oil-based shell epoxy
Co., Ltd.] EXT-001 20 parts by weight [non-reactive diluent, Daito Sangyo Co., Ltd.] Main agent [2] Epicote 828 80 parts by weight Cardiura E-10 10 parts by weight [fatty acid glycidyl ether, Yuka Ciel Epoxy Co., Ltd. )] Hysol SAS-296 10 parts by weight [Nippon Petrochemicals Co., Ltd.] Base agent [3] Epicote 807 80 parts by weight [Bisphenol F type, oil-based shell epoxy
Co., Ltd.] EXT-001 20 parts by weight B Curing agent Curing agent [1] Phenol, formalin, xylylenediamine condensate 60 parts by weight Polyamide amine 30 parts by weight Benzyl alcohol 10 parts by weight Curing agent [2] Phenol, formalin, ethylenediamine Condensate: 50 parts by weight Benzyl alcohol: 20 parts by weight A primer layer was formed using the above epoxy resin and curing agent. The following table shows the composition of the primer layer and its evaluation results. 【table】

Claims (1)

[Claims] 1 In a paving method that forms a surface layer mainly composed of a polymer material on the underlying concrete surface of a concrete structure via a primer layer, an epoxy resin composition in which water and cement are dispersed is applied to the underlying concrete surface and allowed to harden. A method for paving the surface of a concrete structure, characterized by forming a primer layer that can effectively prevent blistering.