JP5125395B2 - Finishing method of concrete surface - Google Patents

Description

  The present invention relates to a method for finishing a concrete surface provided with a surface finish on the surface of the concrete.

As a concrete surface finishing method with a surface finishing material on the concrete surface, a concrete surface finishing method is known in which a fiber sheet is attached to the surface of the concrete with an adhesive and the surface finishing material is bonded via the fiber sheet. (For example, see Patent Document 1). As an adhesive that bonds the concrete and the fiber sheet, mortar or polymer cement adhesive is used.
Japanese Examined Patent Publication No. 2-61584

  Concrete may crack due to drying shrinkage or the like. On the other hand, the mortar that bonds the concrete and the fiber sheet is hard and does not have elasticity. In addition, polymer cement adhesives have different physical properties depending on the ratio of polymer and cement, and polymer cement adhesives that have been used to bond concrete and fiber sheets are also low in the ratio of polymers contained. Hard and non-stretchable. For this reason, when a crack occurs in the concrete, the surface finish material adhered to the surface may crack or float.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a concrete surface finishing method capable of suppressing cracking of the surface finishing material or peeling of the surface finishing material. To do.

In order to achieve the above object, a concrete surface finishing method according to the present invention includes a step of applying a polymer cement adhesive having an elongation at break of 30% or more to a concrete wall surface , and the applied A concrete wall comprising a step of attaching a fiber sheet having a three-dimensional network structure made of alkali-resistant and water-resistant fibers on a polymer cement adhesive, and a step of attaching a surface finish on the fiber sheet. A method for finishing a body surface, wherein a coating film thickness of a coating layer formed by the applied polymer cement adhesive and the fiber sheet applied is 1 to 3 mm, A method for finishing a concrete wall surface , characterized in that the polymer cement adhesive is stuck before curing .

  According to such a concrete surface finishing method, the fiber sheet is stuck to the surface of the concrete with a polymer cement adhesive having an elongation at break of 30% or more. Polymer cement adhesives with an elongation of 30% or more at the time of tensile rupture tend to expand and contract, so even if cracks or the like due to drying shrinkage or the like occur in concrete, the polymer cement adhesives will displace due to cracks etc. Can be absorbed. For this reason, since the surface finishing material stuck on the fiber sheet is less susceptible to displacement due to cracks or the like, it is possible to suppress the occurrence of cracking or peeling off of the surface finishing material.

In addition, since the fiber sheet has a three-dimensional network structure composed of alkali-resistant and water-resistant fibers, the fiber sheet does not deteriorate or decrease in strength due to alkali content or moisture contained in the cement. It is possible to bond the concrete and the surface finishing material more firmly by being stuck on the system adhesive.
Moreover, since the coating thickness of the coating layer formed on the concrete surface by the applied polymer cement adhesive and the fiber sheet attached is 1 to 3 mm, the coating thickness of the polymer cement adhesive is less than 1 mm. Therefore, it is easier to expand and contract with respect to displacement caused by cracks in concrete. For this reason, it is possible to more reliably suppress the occurrence of cracks and floating of the surface finish material stuck on the coating layer.

In this surface finishing method, the polymer cement adhesive preferably has a zero span tension elongation of 1.0 mm or more.
According to such a concrete surface finishing method, the fiber sheet is stuck to the concrete surface with a polymer cement adhesive having a zero span tension elongation of 1.0 mm or more. Polymer cement adhesives with zero span tension elongation of 1.0 mm or more are easy to follow displacement, so even if cracks occur in the applied concrete, polymer cement adhesives are resistant to displacement due to cracks, etc. Follow, and it is possible to more effectively suppress the occurrence of cracking and floating of the surface finishing material stuck on the fiber sheet.

In this concrete surface finishing method, the polymer cement adhesive preferably has an adhesion strength of 0.4 N / mm ² or more.
According to such a concrete surface finishing method, the fiber sheet is stuck to the concrete surface with a polymer cement adhesive having an adhesion strength of 0.4 N / mm ² or more. For this reason, the fiber sheet is firmly attached to the concrete, and it is possible to suppress the occurrence of floating of the surface finish material attached to the fiber sheet.

In this concrete surface finishing method, the polymer cement adhesive is preferably a polymer cement waterproofing material.
According to such a concrete surface finishing method, since the polymer cement adhesive is a polymer cement coating waterproofing material, it can be waterproof.

In this concrete surface finishing method, it is desirable that the fiber sheet is fluffed and stuck.
According to such a concrete surface finishing method, since the fiber sheet attached to the surface of the concrete is fluffed, when the surface finish is applied to the fiber that is fluffed almost uniformly over a wide area of the concrete surface. Acts like an anchor. For this reason, it is possible to stick the surface finish more firmly.

  ADVANTAGE OF THE INVENTION According to this invention, it is possible to provide the finishing method of the concrete surface which can suppress that a surface finishing material cracks or a surface finishing material floats.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.
In the present embodiment, as a concrete surface finishing method, a finishing method in which tiles as surface finishing materials are attached to the surface of structural concrete will be described as an example. FIG. 1 is a cross-sectional view for explaining a wall surface constructed by a concrete surface finishing method according to the present invention. FIG. 2 is a diagram for explaining the steps of the concrete surface finishing method of the present embodiment.

  In the concrete surface finishing method of the present embodiment, the surface of the structural concrete 10 to which the tiles 12 are attached is preliminarily subjected to preprocessing such as cleaning, removal of the fragile layer, and roughening processing.

Next, a polymer cement adhesive is applied to the surface of the pre-treated structural concrete 10 by ironing, roller coating, or spraying (S001). Although the characteristics of the polymer cement adhesive differ greatly depending on the blending ratio of the polymer, the polymer cement adhesive used in the present embodiment is a polymer cement adhesive having a relatively high blending ratio of the polymer, and at the time of tensile fracture. For example, a polymer cement-based waterproofing membrane 14 having the characteristics of an elongation of 30% or more, a zero span tension elongation of 1.0 mm or more, and an adhesion strength of 0.4 N / mm ² or more is used. Examples of such a polymer cement-based waterproofing membrane 14 include AE Coat (product name) manufactured by E-Tech Co., Ltd. as an example.

  A three-dimensional network structure such as a base net (trade name) made of alkali-resistant and water-resistant fibers before the polymer cement-based waterproofing membrane 14 is cured on the applied polymer-cement-based waterproofing membrane 14 The fiber sheet 16 is attached to form a coating layer 18 composed of the polymer cement-based waterproofing membrane 14 and the fiber sheet 16 (S002). At this time, the fiber sheet 16 is fluffed so that the coating film thickness of the coating film layer 18 is 1 to 3 mm. In the standard construction, the polymer cement-based waterproofing membrane 14 having a high polymer cement ratio and easily sagging has a coating thickness of less than 1 mm, but the coating thickness of the coating layer 18 can be increased by making the fiber sheet 16 fluffy. It is easy to make the thickness 1 to 3 mm.

  In this process, the fiber sheet 16 is pressed against the surface side of the structural concrete 10 and vibrated by the vibrator using a pressing tool such as a trowel, a roller, and a pressing plate to which a vibrator is attached. By vibrating while pressing in this manner, the fiber sheet 16 having a three-dimensional network structure is sufficiently impregnated with the polymer cement-based waterproof coating material 14, and the fiber sheet 16 is well bonded and integrated with the structural concrete 10. It is possible. Here, examples of the alkali-resistant and water-resistant fiber constituting the fiber sheet 16 having a three-dimensional network structure include acrylic fiber, polypropylene fiber, vinylon fiber, rayon fiber, nylon fiber, glass fiber, polyester fiber, and carbon fiber. . A fiber sheet 16 having a three-dimensional network structure is formed by using one type or two or more types of these fibers and a woven fabric, a nonwoven fabric, or a composite of the woven fabric and the nonwoven fabric.

  Then, after curing for about one week, the tile 12 is stuck with the mortar 20 for sticking the tile 12 (S003), and the joint mortar 22 is applied to complete the outer wall 1.

  According to the concrete surface finishing method of this embodiment, the polymer cement-based waterproofing membrane 14 for attaching the fiber sheet 16 to the structural concrete 10 has an elongation rate of 30% or more at the time of tensile fracture and zero span tension elongation. Since the amount is 1.0 mm or more, it is easy to expand and contract, and even if the structural concrete 10 is cracked due to drying shrinkage or the like, the polymer cement-based waterproof membrane 14 and the fiber sheet 16 Since the coating film layer 18 follows the crack, it is possible to prevent the tile 12 from cracking or peeling off. In particular, since the fiber sheet 16 has a three-dimensional network structure, the fiber sheet 16 can be sufficiently impregnated with the polymer cement-based coating waterproof material 14 to reliably prevent the tile 12 from cracking or peeling off. For this reason, since the crack is not generated in the tile piece having high rigidity itself and the crack is concentrated at the joint of the tile, the beauty of the entire tile wall surface can be maintained.

In addition, since the polymer cement-based waterproof membrane 14 for attaching the fiber sheet 16 has an adhesion strength of 0.4 N / mm ² or more, the fiber sheet 16 is firmly attached to the structural concrete 10 and the coating layer It is possible to suppress the occurrence of peeling and peeling of the 18 and the tile 12.

  Furthermore, since the fiber sheet 16 is made of an alkali-resistant and water-resistant fiber, the fiber sheet 16 is not deteriorated or reduced in strength by alkali or moisture contained in the cement. For this reason, it is possible to bond the structural concrete 10 and the tile 12 more firmly by being stuck on the polymer cement-based waterproofing membrane 14.

  Further, since the fiber sheet 16 stuck to the surface of the structural concrete 10 is fluffed, the fibers fluffed almost uniformly on a wide area of the surface of the structural concrete 10 acts like an anchor when the tile 12 is stuck. To do. For this reason, it is possible to stick the tile 12 more firmly.

  Moreover, the coating thickness of the coating layer 18 formed on the surface of the structural concrete 10 by the applied polymer cement-based waterproofing material 14 and the applied fiber sheet 16 is increased by fluffing the fiber sheet 16. It can be 1 to 3 mm. Then, by setting the coating thickness of the coating layer 18 to 1 to 3 mm, the outer wall 1 that is easy to expand and contract with respect to the displacement due to cracks or the like than when the coating thickness of the polymer cement adhesive is less than 1 mm. It can be formed. For this reason, it is possible to more reliably suppress the occurrence of cracks and peeling of the tile 12 stuck on the coating layer 18.

  In addition, since the polymer cement-based coating waterproofing material 14 is used as the polymer cement-based adhesive, the outer wall 1 is resistant to cracking and peeling off while having a waterproof function only by finishing the outer wall 1 without performing special waterproofing treatment. Can be formed.

  Next, a confirmation experiment for cracking and peeling of tiles in a wall constructed by the concrete surface finishing method of the above embodiment and a wall constructed by a conventional construction method will be described.

<< Experimental method >>
Create a specimen (first specimen) constructed by the finishing method of the above embodiment and a specimen (second specimen) constructed by the conventional finishing method, and connect the four corners of each specimen with pins. The steel force frame is fixed to the four sides of the test body, attached to a universal testing machine (load capacity: 250 kN), and subjected to uniaxial compression loading in the vertical diagonal direction to check the occurrence of cracks and delamination. When a uniaxial compression load is applied by a universal testing machine, a tensile force acts on the test body in the horizontal direction simultaneously with the compression force in the vertical direction due to the pantograph effect. Moreover, the loading speed | rate at this time was 5 kN / min, and it applied it until the test body destroyed.

<< Specimen >>
<Tiling foundation>
A small reinforced concrete wall body (hereinafter abbreviated as RC wall body) as a tiled base is a flat plate of 547 × 547 × 75 mm. The bar arrangement is single D6 @ 75 both vertically and horizontally, and the reinforcing bar ratio is 0.465%, imitating the actual structure.

<Attaching the base net as a fiber sheet>
・ For the first test body constructed by the finishing method of the above embodiment, a special primer is applied in advance, and then an AE coat (product name) made by ETEC is applied to the surface of the RC wall with a thickness of 2 mm, and a base net is attached. It was. In addition, since the AE coat of the standard composition is sagging, the mixing water amount was set to 1/2 to 2/3 of the standard.
-The second test specimen constructed by the conventional finishing method is a light made by Nippon Stucco, which is pre-coated with a water absorption modifier (Hiflex # 1000 (registered trademark), 5 times solution) and then mixed with an admixture. Stout (product name) was applied to the RC wall surface with a thickness of 2 mm, and a base net was attached.
At this time, in any of the test bodies, the net was sufficiently impregnated with AE coat (product name) or light stout (product name) so that the surface side of the base net was fluffy.

<Tile attachment>
For both the first test body and the second test body, 50 2-chome mosaic unit tiles were stretched with a mask using a double one P1 made by Nippon Kasei. However, mortar was also ironed in advance on the base side. As the joint mortar, Tyrone (registered trademark) made by Taiheiyo Material was used.

<< Measurement item and measurement method >>
FIG. 3 is a diagram for explaining the shear deformation angle.
The first and second specimens with high sensitivity displacement gauges attached in two diagonal directions are attached to a universal testing machine (load capacity 250 kN) and subjected to uniaxial compression loading in the longitudinal diagonal direction, as shown in FIG. Thus, the shear deformation angle γ of the first test body and the second test body was calculated by the following equation using the values d1 and d2 obtained by the high sensitivity displacement meter.
Shear deformation angle γ = ((d1 + d2) / 2 × (1 / cos θ))) / h0
Then, cracks on the surface of the specimen when the shear deformation angle was 5/1000 (interlayer deformation angle: 1/200) were recorded by visual observation, and peeling of the finished layer was judged by percussion with a test hammer.

<< Result >>
The results are shown in Table 1 in terms of the ratio of the number of cracks and peeling to the total number (32) of tiles attached to the first test body and the second test body.

  As shown in Table 1, the test body constructed by the finishing method of the above embodiment has a result that the occurrence of cracking and peeling is remarkably suppressed as compared with the test body constructed by the conventional finishing method. It has been.

<< Waterproof test of specimen >>
Furthermore, in order to confirm the waterproofness after the occurrence of cracks at an interlayer deformation angle of 1/200, the test specimen was placed horizontally with the tiled side facing up, and water was applied to the tiled surface at a depth of about 3 cm, and the back surface Side leakage was observed.

  As a result, no leakage of water was observed for the first test body constructed by the finishing method of the above embodiment, whereas on the other hand, the second test body constructed by the conventional finishing method had a significant water leakage immediately after water filling. Was confirmed. At an interlayer deformation angle of 1/200, it was confirmed that although the RC test specimen had cracks with a maximum width of 0.7 mm, waterproofing was also ensured according to the finishing method of the above embodiment.

  That is, according to the finishing method of the above-described embodiment, even if the adhesiveness of the tiled layer decreases with the lapse of time, or even if the concrete wall cracks due to drying shrinkage or the like, the tile does not peel off, and the tile It is possible to construct a tiled outer wall that maintains safety and aesthetics without cracking the ceramic piece itself, and that also adds waterproofness to the outer wall surface.

  In the said embodiment, although the example using a tile as a surface finishing material was demonstrated, it does not restrict to this.

  Moreover, the said embodiment is for making an understanding of this invention easy, and is not for limiting and interpreting this invention. The present invention can be changed and improved without departing from the gist thereof, and it is needless to say that the present invention includes equivalents thereof.

It is sectional drawing for demonstrating the wall surface constructed by the finishing method of the concrete surface which concerns on this invention. It is a figure for demonstrating the process of the finishing method of the concrete surface of this embodiment. It is a figure for demonstrating a shear deformation angle.

Explanation of symbols

1 exterior wall, 10 structural concrete, 12 tiles,
14 polymer cement coating waterproofing material, 16 fiber sheet, 18 coating layer,
20 mortar, 22 joint mortar

Claims (5)

Applying a polymer cement adhesive having a tensile elongation at break of 30% or more to the concrete wall surface ;
A step of attaching a fiber sheet having a three-dimensional network structure made of alkali-resistant and water-resistant fibers on the applied polymer cement adhesive,
Pasting a surface finish on the fiber sheet;
A method for finishing a wall surface of a concrete having
The coating thickness of the coating layer formed by the applied polymer cement-based adhesive and the fiber sheet applied is 1-3 mm,
The method for finishing a concrete wall surface , wherein the fiber sheet is stuck before the polymer cement adhesive is cured . A method for finishing a concrete wall surface according to claim 1,
The polymer cement adhesive has a zero span tension elongation of 1.0 mm or more, and is a method for finishing a concrete wall surface . A method for finishing a concrete wall surface according to claim 1 or 2,
The method for finishing a concrete wall surface , wherein the polymer cement adhesive has an adhesion strength of 0.4 N / mm ² or more. A method for finishing a concrete wall surface according to any one of claims 1 to 3 ,
The method for finishing a concrete wall surface , wherein the polymer cement-based adhesive is a polymer cement-based waterproofing coating material. A method for finishing a concrete wall surface according to any one of claims 1 to 4 ,
A method for finishing a concrete wall surface , wherein the fiber sheet is fluffed and attached.

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