JPS60156857A - Surface treatment of concrete body - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a surface treatment method for maintaining a good bond between a finishing material applied to the surface of a concrete body and the body.

In general, concrete structures are finished by applying a base coat with mortar after the concrete has sufficiently dried, or are directly tiled or blown to finish. The particular problem with these finishes is that
]Creation 1 - How to properly bond and join the frame and finishing materials to integrate them.

In order to improve the adhesion between the finishing material and the concrete structure, an adhesive method is generally used in which a synthetic resin emulsion is applied to the surface of the concrete structure. In this case, "Incree 1 to 11
The durability of the polymer film interposed between the surface of the 111 body and the finishing material is important, and if the durability is low, the finishing material may easily come off, which is extremely dangerous. In addition, a construction method is used in which a synthetic resin 1 mulsion is mixed into the base material such as mortar to improve adhesion, but even in this case, because of the sense of security that is being used, I decided to use the easy method II. Therefore, the reality is that it is not possible to completely prevent the finish material from peeling off.

In order to prevent such peeling of the finishing material, conventionally, too much emphasis has been placed on one aspect of the adhesive strength of the finishing material to the base, and for this reason, the problem has not been completely solved.

However, in the above-mentioned finishing method83, materials with different properties are arranged in multiple layers, so it is necessary to take into account the differential movement (different movement of each layer) between the constituent materials due to moisture and heat added after construction. I have to.

For this reason, in addition to adhesive strength, diffrency 1? The effect of alleviating the peeling stress caused by differential movement is equally important, and unless the balance between the peeling stress caused by differential movement and the adhesive strength between each layer is taken into consideration, it is impossible to eliminate the problems described above. It doesn't happen.

In other words, in order to prevent the peeling of finishing materials on the surface of concrete bodies, it is necessary to take into account the relaxation of peeling stress in addition to the basic architectural adhesive technique of "combining glue and nails."

This invention was made in view of the above-mentioned technical problem, and its purpose is to improve the adhesion between the concrete frame and the finishing material applied to the surface of the concrete, and
To provide a method for surface treatment of a concrete frame, which can prevent cracking, peeling, and flaking of a finishing material by alleviating peeling stress caused by deformation such as shrinkage or thermal expansion of the concrete body or finishing material. There is a particular thing.

In order to achieve the above object, this invention
1- Apply a polymer cement-based adhesive to the surface of the building block, and while this adhesive is in an uncured state, integrate a porous fiber sheet made of alkali-resistant and water-resistant fibers onto the surface of the 21-frame. After the first step, a surface finishing material is applied to this part using the above-mentioned porous fiber sheet as a base.

In this method, the surface of a porous fiber sheet impregnated with a polymer cement 1-based adhesive and bonded to the surface of the -C concrete 1-Qll1 body becomes fluffy, and the fibers can be used as finishing materials such as mortar and plaster. In contrast, a homogeneous anchor roars. In other words, in addition to the conventional method of physically and chemically adhering the concrete barrel and the finished product, a mechanical bonding effect of 40 N with the anchor is produced. Due to the synergistic effect of the mechanical bond and the mechanical bond, adhesiveness is high, and variation in contact strength is extremely small.

Therefore, even if the finishing material and the concrete structure expand and contract due to heat and moisture after construction, and tensile stress and shear stress move at the adhesive interface, the anchoring effect of the fibers mentioned above will alleviate the stress and prevent cracks in the finishing material. and peeling is extremely reduced. Furthermore, even if a crack A) peels off in the finish H, it will not come off due to the anchoring effect of the fibers.

The method of this invention will be specifically explained below. J to this invention
As mentioned above, the porous fiber sheet is resistant to oxidation.
Water-resistant fibers include acrylic fibers and polypropylene!
M-string, vinylon fiber, and rayon fiber.

Nylon m miscellaneous, glass fiber, poly”, stell fiber.

asbestos! 1i fiber, rock wool fiber, carbon fiber, etc. are used. The above-mentioned porous fiber sheet 1- is made by using one type or two or more of these 1AIi strings and making it into a nonwoven fabric, woven fabric, or knitted fabric. Among these, point C', a nonwoven fabric having three-dimensional voids due to intertwining of fibers, is preferred. Methods for producing nonwoven fabrics include dipping, needle punching, spunbonding, and stitching, all of which are suitable. Further, the porous fiber sheets 1 to 1 may be constructed by combining the sheet 11 or a knitted fabric with a nonwoven fabric, and in this case as well, favorable effects can be achieved.

The above-mentioned polymer membrane 1-system connection 'It 94 applicable to the method of this invention includes, for cement, water, and aggregate,
For example, a polymer cement compound containing an appropriate amount of a polymer such as methylcellulose, styrene-butane-based synthetic rubber latex, ethylene-vinyl acetate copolymer resin emulsion, or acrylic resin-based synthetic resin emulsion is used.

To apply the above-mentioned porous fiber sheet, first, a polymer cement-based adhesive is applied to the surface of the concrete structure by rolling, spraying, etc., and before the adhesive has hardened, the porous fiber sheet is pasted, This is done by pressing down using a roller, presser plate, etc. In this process, it is extremely important to use the above-mentioned holding tools such as trowels, rollers, and holding plates equipped with vibrators to vibrate them at the same time while pressing the porous fiber sheet against the surface of the concrete structure. It is valid. By this vibration, the porous fiber sheet can be sufficiently impregnated with the polymer cement-based adhesive, and the concrete frame and the porous fiber sheet can be bonded and joined extremely well and integrated.

Also, do not rub the surface of the concrete structure with a Wi-A7 brush in advance to remove more fuzz on the surface.]
It is effective in increasing the adhesion between the concrete structure and the porous fiber sheet.

The method of applying mortar C as a finishing material in the method of this invention is no different from the conventional construction method.

In other words, it is necessary to prevent the mortar from drying out due to water on the underlying surface, and since the strength of the mechanical bond only due to the anchoring effect of the IM fibers mentioned above is low, the chemical bond inherent in the mortar should also be used to the maximum extent possible. We must take into consideration how this will be demonstrated.

Also stucco, plaster.

The same applies to the construction of surface finishing materials such as thick paint and tiles.

Moreover, the surface treatment method of this invention is applied to cast-in-place concrete 1.
・It is not only applicable to C, but can be similarly applied to factory production of concrete products such as precast concrete.

Next, two specific examples of this invention will be shown below.

<Example 1> Three-dimensional mesh polyethylene II with a basis weight () 40 g/1112
3001+1111
(thickness 50111111), and after 7 days, apply mortar with a ratio of 1:1: sand: 1:2 (volume ratio) to a thickness of 5 mm. Then, after 28 years of mortar material age, a tensile adhesion test of the finishing material was conducted using an Autograph DSS5000 model manufactured by Shimadzu Corporation at a test speed of 11IIIll/sec. As a result, an average maximum stress of 15 kgf/cf was obtained, and even after the maximum stress, the specimen fractured at an out-of-plane deformation of about 5 mm while maintaining a tensile stress of 4 to 6 kgf/cf.

Table 1 <Example 2> Nylon 1M having a three-dimensional mesh with a basis weight of GJ50Q/v'
The nonwoven fabric made of string was pasted on the concrete wall surface using a polymer cement 1 adhesive shown in Table 2 while being pressed down with a roller equipped with a vibrator, and the next day.
Flat edge tiles were pasted using a modified pressure-bonding method using mortar with a cement:sand ratio of 1:2 (volume ratio). After 28 days, the tensile adhesive strength of the flat tile finish layer was measured using a Kenken tensile adhesive saw tester, and an average value of 15.1 kgf/cd was obtained. Further, when the tiled finish layer was hit with a hammer, the tiled finish layer broke into pieces, but did not peel off from the concrete wall.

Table 2 As is clear from the above examples, according to the method for surface treatment of a concrete body 1-11i of the present invention, an extremely good bonding state between the concrete body and the workpiece 1-H applied to this surface can be maintained. be able to.

Patent applicant: Takeda Pharmaceutical Company Limited Hitoshi Hayashi Gumi Co., Ltd. Successful patent attorney - Kensuke Iro

Claims (4)

[Claims] (1) Apply a polymer cement-based inoculant to the surface of the concrete structure, and apply a porous Ili sheet made of C1 alkali-resistant and water-resistant fibers to the uncured adhesive on the surface of the concrete structure. Paste it on, then
A surface treatment method for concrete 1~Ol rest, which is characterized in that the above-mentioned porous fiber sheet 1~ is bound as a base and a surface finishing material is applied to this part. (2) In the step of pasting the porous m-fiber sheet, a vibrator is attached [the porous m-fiber sheet is pressed against the surface of the concrete shaver with a clamp and vibrated, and the polymer cement-based welding material 4i14 is 2. The method for surface treatment of a concrete frame according to claim 1, wherein the porous fiber sheet is sufficiently impregnated. (3) The above porous fiber sheet is made of acrylic if! I, polypropylene fiber, nylon fiber, vinylon sui. Rayon W! fiber, polyester fiber, glass fiber. The surface of the concrete frame according to claim 1, characterized in that it is made of a nonwoven fabric, woven fabric, or knitted fabric made of one or more types of fibers selected from asbestos Ii fibers, asbestos m fibers, and carbon fibers. Processing method. (4) Surface treatment of the concrete frame 1 according to claim 1, wherein the surface finishing material is selected from cement I mortar, plaster, thick paint, and tile. Method.