JP2009209594A - Concrete structure and its construction method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a concrete structure which enables washing cleaning for maintaining beauty, by solving problems such as the cracking and separation of a finishing material for a concrete surface, caused by distortion of substrate concrete, when the finishing material such as a natural stone or a tile is used for surfaces such as the wall surface, ceiling and floor surface of the concrete structure such as the entrance and lobby of a condominium building, an office, etc.; and to provide a construction method for the concrete structure. <P>SOLUTION: This construction method for the concrete structure comprises a step of forming a polymer cement-based strain stress absorbing material layer on the concrete surface, and a step of laying the finishing material on the surface of the polymer cement-based strain stress absorbing material layer by means of mortar, in this order. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a method for constructing a concrete structure in which the surface of a concrete structure of various buildings is finished with a stone or a tile, and a concrete structure obtained by the method.

  When finishing the exterior and interior surfaces of buildings such as condominiums and offices, there are cases where a method of finishing tiles such as natural stones and ceramic plates as a finishing material to produce a surface with excellent aesthetics and texture is sometimes employed.

  As such a construction method, Patent Document 1 discloses a tile for finishing a structure (finishing material) such as porcelain tile, porcelain tile, semi-porcelain tile, ceramic tile, Portland cement, alumina cement, gypsum, polymer dispersion, There is disclosed a tiling method in which a mortar composition mainly composed of aggregate and water is used for bonding.

Further, in Patent Document 2, a waterproof layer made of an extensible hydrated solidified coating material having an elongation of 50% or more at room temperature and a tensile strength of 10 kgf / cm ² or more is formed on the board surface of the outer wall material, A waterproof wall structure is disclosed in which a tile or other outer wall constituent material is attached or applied to a waterproof material layer via cement mortar.

  On the other hand, in the cited document 3, in the construction, skill is not required even in the construction with a roller and the workability is good, and in terms of characteristics, the coating of the coating film does not cause cornering, material separation and skinning. Disclosed is a waterproof polymer cement composition that provides a good finish and gives a structure excellent in water resistance, adhesion, low temperature elongation, and weather resistance. Specifically, the polymer cement composition is a waterproof polymer cement composition comprising an alumina cement, an emulsion and a phyllosilicate mineral, the emulsion comprising an ethylene-vinyl acetate copolymer emulsion and an acrylic polymer emulsion. A polymer cement composition for waterproofing comprising 3 to 20 parts by mass of a solid content of an acrylic polymer emulsion with respect to 100 parts by mass of a solid content of an ethylene-vinyl acetate copolymer emulsion It is disclosed.

JP-A 61-261656 JP-A-10-317518 Japanese Patent Laid-Open No. 2004-262748

  When finishing the exterior and interior surfaces of walls, ceilings, etc., with finished surfaces using tiles such as natural stones and ceramic plates as the finishing material, the building concrete that has been in service for several decades is creeped into the underlying concrete. When distortion occurs or the underlying concrete is distorted due to an earthquake or the like, the finish on the concrete surface may cause problems such as cracking or peeling. Furthermore, when cleaning with water is performed to maintain the appearance of the finished surface of the concrete structure, water penetrates from the joints of the natural stones and tiles to the underlying concrete via mortar and adhesive, and the natural stones and tiles are peeled off. May trigger.

  Therefore, the present invention is used when a finishing material such as natural stone or tile is used on the outer wall of a concrete structure such as a condominium or an office, the wall such as an entrance or a lobby in a concrete structure, the surface of a ceiling or floor. To provide a concrete structure that can be washed and washed to improve the problem of cracking and peeling of the finishing material on the concrete surface due to distortion of the underlying concrete, and to provide a method for its construction. Objective.

  As a result of repeated intensive trial and error for the above problems, the present inventors have obtained a predetermined polymer cement-based strain stress absorption when finishing the surface of a concrete structure such as a wall surface, a ceiling, and a floor surface with a natural stone or a tile. The present inventors have found that excellent strain stress absorption performance is exhibited by applying a material to form a polymer cement-based strain stress absorber layer. Furthermore, by laying and constructing natural stones and tiles using mortar on the surface of this polymer cement strain stress absorber layer, problems such as cracking and peeling of the finishing material on the concrete surface due to distortion of the underlying concrete may occur. The present invention has been completed by finding that a stoned or tiled concrete structure can be obtained that can be washed with water to maintain an improved aesthetics of the finished surface.

  That is, the present invention includes a step of forming a polymer cement-based strain stress absorber layer on the concrete surface and a step of laying a finishing material using mortar on the surface of the polymer cement strain stress absorber layer. It is the construction method of the concrete structure including in order.

  The present invention also includes a step of forming a primer layer for a polymer cement strain stress absorber by applying a polymer cement strain stress absorber primer on the surface of the concrete and drying, and a polymer cement strain stress A step of forming a polymer cement strain stress absorber layer by applying a polymer cement strain stress absorber to the surface of the primer layer for absorber and curing, and a step of forming a polymer cement strain stress absorber layer on the surface of the polymer cement strain stress absorber layer And a method for constructing a concrete structure, including a step of fixing a finishing material using mortar in this order.

The preferable aspect of the construction method of this invention is shown below. In the present invention, these embodiments can be appropriately combined.
(1) The polymer cement strain stress absorber layer is formed by applying and curing a polymer cement strain stress absorber prepared by kneading a hydraulic composition and a polymer emulsion.
(2) The hydraulic composition contains alumina cement, and the polymer emulsion is an acrylic resin emulsion and / or an ethylene / vinyl acetate emulsion.
(3) The finishing material is a rectangular, square, or rhombus stone and / or tile, and the length of each side of the finishing material is 40 to 900 mm and the thickness is 5 to 30 mm.

  Moreover, this invention is a concrete structure obtained by said construction method.

  According to the present invention, when a finishing material such as natural stone or tile is used on the outer wall of a concrete structure such as a condominium or office, or the inner wall surface, ceiling, or floor surface of a concrete structure such as an entrance or a lobby. It is possible to obtain a concrete structure that can be washed and washed to maintain the aesthetics, and to improve the construction method, in which problems such as cracking and peeling of the finishing material on the concrete surface due to distortion of the concrete are improved.

  In the concrete structure of the present invention, a base layer (polymer cement strain stress absorber layer 21 or the like) is formed on the surface of the concrete 11 using a polymer cement strain stress absorber, and then a finishing material 14 such as stone or tile. The surface of a concrete structure is finished using The concrete structure of the present invention can use finishing materials such as natural stones and tiles on the outer wall surfaces of apartments and offices, the inner wall surfaces of concrete structures such as entrances and lobbies, and the surfaces of ceilings and floors. . Hereinafter, an example of the embodiment of the concrete structure of the present invention and the construction method thereof will be described with reference to FIGS.

<Primer layer for polymer cement-based strain stress absorber>
In the construction method of the present invention, as shown in FIG. 1 (1), first, a primer for polymer cement strain stress absorber is applied to the surface of concrete 11 and dried, and then a primer layer 20 for polymer cement strain stress absorber. Form.

  By forming the primer layer 20 for the polymer cement strain stress absorber, the moisture in the polymer cement strain stress absorber permeates into the concrete 11 when the polymer cement strain stress absorber is applied on the primer layer 20. The action can be prevented, and the concrete 11 and the polymer cement-based strain stress absorber layer 21 can be firmly bonded. As the primer for the polymer cement strain stress absorber used in the present invention, an acrylic polymer resin, an acrylic-styrene copolymer resin, or a commercially available primer mainly comprising an ethylene vinyl acetate copolymer can be used. What has a styrene copolymer resin as a main component can be used conveniently.

  Moreover, an acrylic resin emulsion is preferable as a primer for a polymer cement-based strain stress absorber. In particular, an acrylic resin emulsion (referred to herein as “AS stock solution (SP)”) that is particularly preferable as a primer for a polymer cement strain stress absorber is composed of (1) methyl (meth) acrylate and ethyl (meth) acrylate. 9 to 35% by mass of selected components, (2) 50 to 80% by mass of alkyl (meth) acrylate having an alkyl group having 4 to 10 carbon atoms, and (3) 5 to 10 mass of (meth) acrylate having an OH group % Of the monomer composition. The acrylic resin emulsion is obtained from a monomer composition containing less than 0.6% by mass of a component selected from (4) (meth) acrylate having a COOH group in addition to the above (1) to (3). It is preferable.

<Polymer cement-based strain stress absorber layer>
Next, as shown in FIG. 1 (2), a polymer cement strain stress absorber is applied to the surface of the primer layer 20 for polymer cement strain stress absorber, and a polymer cement strain stress absorber layer 21 is provided. . The polymer cement-based strain stress absorber layer 21 has an excellent elastic effect, and has natural stones and tiles on the outer wall of the concrete structure, the walls such as the entrance and lobby inside the concrete structure, the ceiling, and the floor surface. When a finishing material such as is used, it serves as a strain-stress absorbing layer when the underlying concrete is strained. Moreover, since the polymer cement type | system | group strain-stress-absorbing-material layer 21 also has waterproof performance, the floor structure body of the stone pasting finish or tile pasting finish which can be washed with water for maintaining the beauty | look can be obtained.

  The polymer cement strain stress absorber used in the present invention is prepared by kneading a hydraulic composition and a polymer emulsion, or prepared by kneading a hydraulic composition, a re-emulsified resin powder and water. If it is, it can use without being specifically limited. In particular, “Aqua Shutter (registered trademark)”, “Aqua Shutter (registered trademark) AC” and “Aqua Shutter (registered trademark) SP” manufactured by Ube Industries, Ltd., which are prepared by kneading a hydraulic composition and a polymer emulsion. Etc. can be used suitably.

  The polymer cement strain stress absorber used in the present invention is a polymer cement strain stress absorber prepared by kneading a hydraulic composition and a polymer emulsion, and the hydraulic composition comprises alumina cement. In addition, the polymer emulsion is preferably an acrylic resin emulsion such as an acrylic polymer emulsion and / or an ethylene / vinyl acetate emulsion such as an ethylene-vinyl acetate copolymer emulsion.

  As the polymer cement-based strain stress absorbing material used in the present invention, specifically, a composition containing an alumina cement having a predetermined composition and a polymer composition (in this specification, “AS admixture (SP / hydraulic composition) Product) and AS stock solution (SP) ”can be preferably used. “AS admixture (SP / hydraulic composition), AS stock solution (SP)” is a polymer cement composition containing alumina cement and an emulsion, and the emulsion is an ethylene-vinyl acetate copolymer emulsion and an acrylic system. It is a polymer cement composition containing a polymer emulsion and containing 1 to 30 parts by mass of the solid content of the acrylic polymer emulsion with respect to 100 parts by mass of the solid content of the ethylene-vinyl acetate copolymer emulsion.

  Moreover, it is more preferable that said polymer cement composition contains 20-80 mass parts of alumina cements with respect to 100 mass parts of solid content of an emulsion. Moreover, it is more preferable that said polymer cement composition contains 20-80 mass parts of alumina cement and 20-240 mass parts of silica sand with respect to 100 mass parts of solid content of an emulsion. In the polymer cement composition, the ethylene-vinyl acetate copolymer emulsion is more preferably an ethylene-vinyl acetate copolymer emulsion using polyvinyl alcohol as a protective colloid.

  When the polymer cement-based strain stress absorber has the above composition, the polymer cement strain stress absorber layer obtained after curing has excellent elasticity with reduced tack, and also has waterproof properties. Become.

  As an example of a method for producing a polymer cement-based strain stress absorber, a predetermined amount of emulsion is measured in a stirring vessel, a predetermined amount of a hydraulic composition is added while stirring the emulsion with a stirrer, and stirred and mixed for several minutes. Further, if necessary, water can be added to produce a slurry composition having a predetermined viscosity.

  In addition, when using a premix powder in which a predetermined amount of a hydraulic composition and a re-emulsified resin powder are weighed and uniformly mixed, a predetermined amount of kneaded water is measured in a stirring vessel, and the water is stirred with a stirrer. A slurry composition having a predetermined viscosity can be produced by adding a predetermined amount of premix powder and stirring and mixing for several minutes.

  The polymer cement-based strain stress absorbing material used in the present invention is applied to the surface of the primer layer 20 for polymer cement-based strain stress absorbing material by a spraying method, a spray coating method, or a roller coating method. The absorber layer 21 can be formed.

  After the polymer cement-based strain stress absorber is dried, the same operation is further repeated to form a plurality of layers of the polymer cement-based strain stress absorber layer 21 to obtain a structure having higher waterproof performance and strain stress absorbing performance. The waterproof performance is even better.

  In addition, after applying the polymer cement strain stress absorber, a glass fiber cloth or a synthetic fiber cloth is laid, and the same operation is repeated to form a polymer cement strain stress absorber layer 21 having a composite structure. A structure having higher performance and higher mechanical strength can be obtained.

  In the present invention, when the underlying concrete of the concrete structure with stone finishing or tiled finishing is distorted, cracks or the like occur in the finishing material 14 such as natural stone, artificial stone, or tile finishing material 14. A polymer cement-based strain stress absorber layer 21 is provided so as to be difficult. In order to appropriately absorb the strain stress, the thickness of the polymer cement-based strain stress absorber layer 21 is preferably in the range of 0.1 to 15 mm, more preferably in the range of 0.2 to 10 mm, more preferably 0.00. The polymer cement-based strain stress absorber layer 21 is provided in a range of 25 to 5 mm, particularly preferably in a range of 0.3 to 0.7 mm. If the thickness of the polymer cement-based strain stress absorber layer 21 is thicker than the lower limit of the above range, it is preferable because the strain stress absorbability is sufficient. Even when a load is applied, the amount of deformation is not so large, which is preferable.

When a force is applied to an object, a stress corresponding to the force is generated inside the material, and a strain proportional to the stress is generated. For example, if a compressive force is applied to an object of length L and the length of the object is deformed to L−ΔL, the strain is the ratio of L and ΔL (ΔL / L). The polymer cement-based strain-stress absorbing material layer 21 provided between the underlying concrete of the concrete structure of the present invention and the finishing material 14 such as natural stone, artificial stone, or tile as the finishing material 14 is a strain of the underlying concrete. It has a function to absorb (strain stress absorbability). Specifically, if the strain on the surface of the underlying concrete is X and the strain on the surface of the polymer cement-based strain stress absorber layer is Y, and a constant representing the strain stress absorbency between X and Y is a, X, Y And a have the relationship of the formula (1).
Y = a · X Equation (1)

When a preferred embodiment of the concrete structure of the present invention is expressed using the formula (1), a is in the range of 0.4 to 0.7 in the range where X is 500 × 10 ⁻⁶ or more and less than 1500 × 10 ^−6. It is preferable that a is in the range of 0.45 to 0.65. In the range where X is 1500 × 10 ⁻⁶ or more and less than 2500 × 10 ⁻⁶ , a is preferably in the range of 0.3 to 0.6, and a is in the range of 0.35 to 0.55. More preferably it is. It is preferable that a for the predetermined range of X is the above range because the strain on the ground concrete surface is sufficiently absorbed. As described above, the polymer cement-based strain stress absorbing material layer has the above-described strain stress absorbing performance, so that the transmission of the strain of the ground concrete to the finishing material such as stone or tile can be buffered.

<Finish>
Next, after the polymer cement-based strain stress absorber layer 21 is dried, a finishing material 14 such as a stone or tile is attached to the polymer cement-based strain stress absorber layer using an affixing mortar 17 as shown in FIG. 21 is laid on the surface. Then, the laying operation of the finishing material 14 is completed by finely adjusting the flatness of the finishing material 14 as shown in FIG.

  When the finishing material 14 is laid, the surface of the polymer cement-based strain stress absorbing material layer 21 is applied almost uniformly to the thickness of 2 to 10 mm, and the mortar 17 is applied, and the finishing material 14 is laid, or the polymer cement The finishing material 14 can be laid by applying the adhesive mortar 17 to the thickness of 1 to 5 mm almost uniformly on both the surface of the system strain stress absorbing material layer 21 and the back surface of the finishing material 14. In particular, when it is applied to both the surface of the polymer cement-based strain stress absorber layer 21 and the back surface of the finishing material 14, voids are unlikely to remain on the back surface of the stone or tile, and damage due to impacted objects or falling objects can be avoided. To preferred.

  The pasting mortar 17 used in the present invention is not particularly limited, and is appropriately selected from commercially available stone pasting mortar, tile pasting mortar, or polymer cement mortar for stone or tile pasting. In particular, polymer cement mortar can be preferably used.

  The thickness of the cured body layer of the pasting mortar 17 is preferably in the range of 1 to 10 mm, more preferably in the range of 1.2 to 5 mm, and particularly preferably in the range of 1.5 to 3 mm. When the thickness of the cured body layer of the pasting mortar 17 is larger than the lower limit value of the range, the adhesive fixing of the finishing material 14 tends to be uniform, and when it is smaller than the upper limit value of the range, the strain stress is reduced to the lower polymer cement system. This is preferable because it can be easily transmitted to the strain stress absorber layer 21.

  In the present invention, stone and / or tiles can be used as the finishing material 14 on the surface of the concrete structure.

  The stone is not particularly limited, and natural stones such as marble and granite have a length of 40 to 900 mm on each side, that is, a vertical length of 40 to 900 mm and a horizontal length of 40 to 900 mm, A rectangular, square, or rhombus-shaped plate-shaped stone whose thickness is cut to 5 to 30 mm can be appropriately selected and used.

  The tiles are not particularly limited in terms of the production method and type, and rectangular, square, or rhombus ceramic tiles or ceramic plates can be suitably used. As for the size of the tile, the length of each side is 40 to 900 mm, that is, the vertical length is 40 to 900 mm, the horizontal length is 40 to 900 mm, and the tile thickness is 5 to 30 mm as appropriate. It can be selected and used.

  Further, in the present invention, it is preferable to finish the finishing material 14 by filling the gaps in the finishing material 14 with various joint materials such as joint mortar after the laying of the finishing material 14 is finished and the pasting mortar 17 is cured.

  As described above, according to the construction method of the present invention, the surface of the concrete 11 which is the outer wall of a concrete structure such as a condominium or office, the wall of the entrance or lobby of the concrete structure, the ceiling, the floor, etc. Further, by applying and applying a polymer cement strain stress absorbing material, it is possible to easily form an underlayer having excellent strain stress absorbability and waterproofness. By using a mortar on the surface of the foundation layer and laying a finishing material 14 such as a stone or a tile, a concrete structure in which the stone or tile is closely joined to the foundation layer via the mortar can be obtained. As a result, since the layer between the concrete 11 and the finishing material 14 has a strain stress absorbing layer (polymer cement-based strain stress absorbing material layer 21) having appropriate elasticity, the surface of the concrete due to the distortion of the underlying concrete is distorted. A concrete structure in which problems such as cracking and peeling of the finishing material are improved can be obtained.

  In a building that has been in service for several decades, if the concrete under the ground is distorted by creep, or if the concrete structure is distorted by an earthquake, the concrete structure in the vertical direction may be distorted. Therefore, when the construction method of the present invention is used to finish the stone wall or the tile wall of the outer wall of the concrete structure or the wall of the entrance or lobby of the concrete structure, the present invention is particularly excellent. This is preferable because it produces an effect.

  Moreover, since the polymer cement type | system | group strain stress absorber layer 21 which has the outstanding stress absorption property also has favorable waterproofness, the surface of the concrete structure of a stone pasting finish or a tile pasting finish is washed and washed. And the aesthetics of the finished surface can be kept constant.

  Hereinafter, the present invention will be described in more detail based on examples. However, the present invention is not limited by the following examples.

(1) Evaluation of concrete structure:
A strain test was conducted on a concrete structure prepared by applying a primer layer for a polymer cement-based strain stress absorber and a polymer cement-based strain stress absorber to concrete and laying ceramic tiles using an adhesive mortar. Specifically, stress was generated by applying pressure to the concrete, and the magnitude of the strain was measured using a strain gauge placed at a predetermined position. The predetermined position is the surface of concrete, polymer cement-based strain stress absorber layer, affixed mortar and tile (finishing material).

(2) Materials, equipment and concrete specimens:
(A) Cement: Normal Portland cement, manufactured by Ube Mitsubishi Cement.
(B) Fine aggregate 1: Crushed sand, produced in Senba-cho, Sano City, Tochigi Prefecture.
(C) Fine aggregate 2: land sand, produced in Narita City, Chiba Prefecture.
(D) Coarse aggregate: Crushed stone, from Iitate, Sakuragawa City, Ibaraki Prefecture.
(E) Admixture: AE water reducing agent, Darex F-1, manufactured by Grace Chemicals.
Strain gauge: manufactured by Tokyo Sokki Kenkyujo Co., Ltd., FLK-10-11-5LT.
-Strain measuring apparatus: Tokyo Sokki Kenkyujo, Portable DATA LOGGER TDS-302.
・ Pressure machine: 200-ton pressure machine manufactured by Tokyo Henki Co., Ltd.
・ Primer for polymer cement strain stress absorber:
Modified ethylene vinyl acetate copolymer resin emulsion ("AS stock solution (SP)", manufactured by Ube Industries, Ltd.).
・ Polymer cement-based strain stress absorber:
“Aqua Shutter (registered trademark) SP” [AS admixture (SP / hydraulic composition), AS stock solution (SP)] manufactured by Ube Industries, Ltd.
-Pasting mortar: Made by Nippon Plaster Co., Ltd., tile crimping mortar.
-Tile: The product made by INAX, YM-255, size: 6x95x45mm.

  Concrete prepared under the conditions shown in Table 1 and Table 2 was used for the production of a concrete specimen used for a strain test of a concrete structure. The prepared concrete was placed in a mold of 100 mm × 100 mm × 400 mm, demolded one day after placement, and then cured in water for 28 days to prepare a concrete specimen.

  Next, a procedure for producing a tiled concrete structure will be described. As shown in FIGS. 2A and 2B, two types of tiled concrete structures, a tiled concrete structure A and a tiled concrete structure B, were prepared as the tiled concrete structure. In the tile finished concrete structure A, a strain stress absorbing material layer is provided on the surface of a concrete specimen, and then tiles are arranged with tile attaching mortar. In addition, the tile finished concrete structure B is obtained by arranging tiles with a tile attaching mortar without providing a strain stress absorbing material layer on the surface of the concrete specimen.

  In the case of the tile finished concrete structure A, as shown in FIG. 2 (a), a strain gauge was attached to the surface of the concrete specimen using an acrylic resin (FIG. 2 (a-1)).

  Next, a primer for a polymer cement-based strain stress absorbing material was applied to the surface of the concrete specimen to which the strain gauge was attached and dried. After the polymer cement strain stress absorber primer on the surface of the concrete is dried, prepare a polymer cement strain stress absorber slurry and uniformly use a plasterer to a thickness of 0.5 ± 0.1 mm. It was applied and applied. The polymer cement-based strain stress absorber slurry is prepared by mixing 13 kg of AS admixture (SP / hydraulic composition) and 18 kg of AS stock solution (SP) in a container and kneading them using a hand mixer. An absorbent slurry was prepared. After the polymer cement-based strain stress absorber slurry was dried, a strain gauge was attached to the surface of the strain stress absorber layer using an acrylic resin (FIG. 2 (a-2)).

  Next, after applying the plaster mortar to the surface of the strain stress absorber layer with the strain gauge attached using a plasterer so that the thickness is 7 mm, install the strain gauge on the surface of the tile attached mortar. (FIG. 2 (a-3)).

  Subsequently, a tile with a thin tile mortar applied to the back of the tile is applied to the surface of the tile mortar with a strain gauge of the concrete specimen so as not to contain air bubbles, and acrylic resin is applied to the surface of the tile. A strain gauge was pasted using, and tiled concrete structure A was produced (FIG. 2 (a-4)). The tile-finished concrete structure A was used for a strain measurement test after being cured in air until the age of 28 days.

  In the case of a tiled concrete structure B, as shown in FIG. 2 (b), the surface of the concrete specimen, the tile-attached mortar layer is the same as above except for the operation of providing a polymer cement-based strain stress absorber layer. Strain gauges were attached to the surface and the tile surface using acrylic resin (FIG. 2 (b-1 to 3)). Thereafter, curing was performed until the age of 28 days, and then a strain measurement test was performed.

  The strain measurement test using the tiled concrete structure was performed according to the following procedure. First, the tile-finished concrete structure A and the tile-finished concrete structure B were fixed to a pressure tester so that a surface of 100 × 100 mm was an upper surface and a lower surface, respectively. Next, load (stress) was applied to the tiled concrete structure at the same loading speed as when the concrete compressive strength test was performed, and each measurement location was determined from several strain gauge signals attached to the tiled concrete structure. The strain was measured with a strain measuring instrument.

  For tiled concrete structures A and B, the results of strain measurement accompanying the application of pressure stress are shown in FIGS. FIG. 3 is a strain test result of the tile-finished concrete structure A having the polymer cement-based strain stress absorber layer of the present invention, and shows the relationship between the stress on the concrete and the strain generated at each measurement location. . Moreover, FIG. 4 is a strain test result of the tile-finished concrete structure B of the comparative example that does not have a polymer cement-based strain stress absorber layer, and the relationship between the stress on the concrete and the strain generated at each measurement location. Is shown.

As apparent from FIG. 3, in the case of the tile-finished concrete structure A having the polymer cement-based strain stress absorber layer of the present invention, the polymer cement-based strain stress absorber layer does not increase even when the stress on the concrete increases. The strain accompanying the stress was absorbed, and only a small strain was generated on the tile surface. Moreover, as shown in FIG. 3, in the case of the tiled concrete structure A, when the stress of 30 N / mm ² or more is applied to the concrete and a large strain occurs in the concrete itself, the tile peeling is not performed. Did not occur.

On the other hand, as shown in FIG. 4, in the case of the tile finished concrete structure B, the strain of the tile suddenly decreased at 29.3 N / mm ² . This is considered to indicate that the tile peeled when the stress of 29.3 N / mm ² was applied and the concrete was distorted.

  From the above results, in the case of the concrete structure having the polymer cement-based strain stress absorber layer of the present invention of the present invention, even when a large strain occurs in the underlying concrete, cracking or peeling of the finishing material on the concrete surface It was confirmed that the problems such as could be greatly improved.

It is a fragmentary sectional view which shows typically the cross section of the tiled finish concrete structure of this invention. It is a schematic diagram which shows the preparation procedures of a tiled finish concrete structure. ((A): With strain stress absorber layer, (b): Without strain stress absorber layer) It is a distortion test result of the concrete structure which has a polymer cement system strain stress absorber layer of the present invention, and is a figure showing relation between pressurization stress to concrete and strain accompanying application of pressurization stress. It is a distortion test result of the concrete structure which does not have a polymer cement type | system | group strain stress absorber layer, Comprising: It is a figure which shows the relationship between the pressurization stress with respect to concrete and the distortion accompanying application of a pressurization stress.

Explanation of symbols

11: Concrete 14: Finishing material 17: Pasting mortar 20: Primer layer 21 for polymer cement-based strain stress absorber 21: Polymer cement-based strain stress absorber layer

Claims (6)

Forming a polymer cement-based strain stress absorber layer on the surface of the concrete;
A method for constructing a concrete structure, which includes a step of laying a finishing material using mortar on the surface of a polymer cement-based strain stress absorbing material layer in this order. A step of forming a primer layer for a polymer cement-based strain stress absorber by applying a polymer cement-based strain stress absorber primer on the surface of the concrete and drying,
A step of forming a polymer cement strain stress absorber layer by applying a polymer cement strain stress absorber on the surface of the primer layer for the polymer cement strain stress absorber and curing the polymer cement strain stress absorber;
A method for constructing a concrete structure, comprising a step of fixing a finishing material using a mortar on the surface of a polymer cement strain stress absorber layer in this order.   The polymer cement-based strain stress absorber layer is formed by applying and curing a polymer cement strain stress absorber prepared by kneading a hydraulic composition and a polymer emulsion. Construction method.   The construction method according to claim 3, wherein the hydraulic composition contains alumina cement, and the polymer emulsion is an acrylic resin emulsion and / or an ethylene / vinyl acetate emulsion.   The finishing material is a rectangular, square, or rhombus stone and / or tile, and the length of each side of the finishing material is 40 to 900 mm and the thickness is 5 to 30 mm. The construction method described.   The concrete structure obtained by the construction method of any one of Claims 1-5.

Images