JP2005171730A - Waterproof structure of floor slab pavement - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a waterproof structure of a floor slab pavement composed of a waterproof layer of a simple constitution having fair strength against a reflection crack, without being influenced by a crack developed in a concrete floor slab. <P>SOLUTION: This waterproof structure 10 of the floor slab pavement is formed by laying the pavement 14 composed of a leveling layer 12 and a surface layer 13 by interposing the waterproof layer 15 in an upper surface of the concrete floor slab 11. The waterproof layer 15 is mainly composed of cement, and has flexural strength of 20 MPa or more and shear strength of 18 MPa or more provided by mixing reinforced fiber, and has a cement board layer 17 formed by vertically and horizontally laying and arranging a fiber reinforced cement board 16 having a thickness of 2 to 10 mm. A backup material 18 is interposed between the concrete floor slab 11 and the cement board layer 17. A pavement adhesive 19 is interposed between the cement board layer 17 and the leveling layer 12. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a waterproof structure for floor slab pavement, in particular, by laying a pavement composed of a leveling layer and a surface layer with a waterproof layer interposed on the upper surface of a concrete floor slab installed on a bridge surface portion of a bridge, for example. The present invention relates to a waterproof structure of a formed floor slab pavement.

  For example, a bridge pavement constructed on the bridge surface of a bridge is constructed by laying a pavement consisting of a leveling layer and a surface layer with an adhesive layer and a waterproof layer interposed on the upper surface of a concrete floor slab. It is common. The waterproof layer penetrates the interior of the concrete through cracks and the like generated in the concrete slab when water from rainwater that has poured onto the bridge pavement passes through the joints or pavement and reaches the concrete slab. The concrete floor slab deteriorates early and deteriorates its durability, and the fatigue failure of the floor slab is remarkably accelerated, thus preventing such water intrusion and durability of the pavement and floor slab. It is a layer provided in order to improve.

As a waterproof layer for preventing water from entering such a concrete floor slab, those using a sheet-based waterproofing material, a coating-based waterproofing material, or a pavement-based waterproofing material are conventionally known ( For example, refer nonpatent literature 1). The waterproofing layer made of sheet-based waterproofing material is formed by laying, for example, asphalt-based waterproofing sheets or synthetic rubber-based waterproofing sheets. Even when cracks are found in the concrete floor slabs, they will follow the cracks to some extent. It is also possible to deform. In addition, the waterproof layer made of a coating-based waterproofing material is formed by, for example, applying a rubber-based solvent-type waterproofing material, an asphalt-based heating-type waterproofing material, a resin-based curable waterproofing material, etc. on the adhesive layer to form a waterproofing film. Therefore, the thickness of the coating film is thinner than that of the sheet-based waterproof material. Furthermore, the waterproof layer by the pavement waterproofing material is formed by, for example, constructing an asphalt mixture called sheet asphalt with a pavement thickness of about 15 to 25 mm, and the certainty of waterproofing is higher than that of the sheet waterproofing material. Slightly inferior.
“Design and construction of bridge pavement”, edited by Hiroyuki Tada, (March 25, 1996, published by Kashima Publishing Co., Ltd.), pages 42-43, pages 50-53, pages 86-87

  On the other hand, especially on highways, drainage pavement has been widely adopted in recent years, and in cold districts, for example, a snow melting agent containing calcium chloride is often sprayed. It is necessary to more effectively prevent salt damage caused by water intrusion. For example, even if a concrete floor slab is cracked, the passage of water from joints and pavements is securely blocked to prevent concrete damage. There is a demand for the development of a waterproof layer that can further improve the durability of the plate.

  That is, especially on expressways, when cracks occur in a concrete slab due to, for example, a wheel load exceeding the design prediction, the waterproof layer is affected by the cracks generated on the concrete slab, and cracks called reflection cracks also occur in the waterproof layer. It tends to occur. The water from the joints and pavement reaches the concrete floor slab through the reflection cracks generated in these waterproof layers, and further penetrates into the concrete through the cracks in the concrete floor slab. It will deteriorate and durability will fall. Therefore, it is necessary to form a waterproof layer that is not easily affected by cracks generated in the concrete slab and has sufficient strength against reflection cracks.

  The present invention has been made paying attention to such conventional problems, and is provided with a waterproof layer having a simple structure that is not easily affected by cracks generated in a concrete slab and has a considerable strength against reflection cracks. Accordingly, an object of the present invention is to provide a waterproof structure of a floor slab pavement that can effectively suppress deterioration of the concrete floor slab and easily improve the durability of the concrete floor slab.

  The present invention is a floor slab pavement waterproofing structure formed by laying a pavement composed of a leveling layer and a surface layer with a waterproof layer interposed on the top surface of a concrete slab, wherein the waterproof layer is mainly composed of cement. And having a cement board layer formed by laying vertically and horizontally fiber reinforced cement boards having a thickness of 2 to 10 mm, having a bending strength of 20 MPa or more and a shear strength of 18 MPa or more obtained by mixing reinforcing fibers. The above object is achieved by providing a waterproof structure for floor slab pavement.

  Further, the waterproof structure of the floor slab pavement of the present invention mainly comprises, for example, an ethylene vinyl acetate copolymer emulsion that regulates water absorption of the fiber reinforced cement board on one or both surfaces of the fiber reinforced cement board. It is preferable that a water absorption adjusting agent composed of a water-soluble liquid as a component is applied.

  Furthermore, the waterproof structure of the floor slab pavement of the present invention has a height of 0.1 to 1.0 mm and a distance of 1.0 to 5.0 mm on one or both surfaces of the fiber reinforced cement board. It is preferable to form mesh irregularities.

  Furthermore, in the waterproof structure of the floor slab pavement of the present invention, it is preferable that the fiber reinforced cement board has a tensile strength of 8 MPa or more.

  Here, in the above description, the bending strength of the fiber reinforced cement board is 250 mm × 350 mm and the thickness t = 7 mm according to JIS A 1408 “Bending and impact test method for building boards”, It is a bending strength when a bending test is performed with a span of 250 mm by the center loading method (vertical / horizontal). In addition, the shear strength of the fiber reinforced cement board was tested in accordance with JIS K 7058 “Glass fiber reinforced plastic transverse shear test method” with a specimen size of 2.5 cm width and thickness t = 7 mm. It is the shear strength at the time. Furthermore, the tensile strength of the fiber reinforced cement board is 40 mm × 300 mm and the thickness t = 7 mm of the test piece, the upper and lower sides of the 300 mm length of the test piece are held with a span of 200 mm, and the tensile speed is 0.5 mm / It is the tensile strength when measured as min.

  Moreover, according to the waterproof structure of the floor slab pavement of the present invention, the reinforcing fiber mixed into the fiber reinforced cement board has a fineness of 6 to 30 dtex, a tensile strength of 9 cN / dtex or more, and a fiber length of 6 to 20 mm. It is preferable to use fibers, and it is preferable to contain 1 to 7% by weight of reinforcing fibers in the fiber reinforced cement board. As such a reinforcing fiber, for example, vinylon fiber, polypropylene fiber, acrylic fiber, aramid fiber, high-strength polyethylene fiber and the like can be used, but it is particularly preferable to use high-strength vinylon fiber having a tensile strength of 9 cN / dtex or more. preferable. The tensile strength of the reinforcing fiber is the tensile strength when measured with a distance between chucks of 100 mm and a tensile speed of 50 mm / min according to JIS L 1015 “Chemical Fiber Stable Test Method”.

  Furthermore, according to the waterproof structure of a floor slab pavement of the present invention, it is preferable that the fiber reinforced cement boards are laid vertically and horizontally with a water stop material interposed between adjacent boards.

  Furthermore, according to the waterproof structure of a floor slab pavement of the present invention, a backup material is interposed between the upper surface of the concrete floor slab and the cement board layer, and between the cement board layer and the leveling layer. The fiber reinforced cement board is preferably laid with a pavement adhesive interposed.

According to the present invention, the fiber-reinforced cement board is obtained by mixing cement fiber as a main component and reinforcing fibers, and thus can exhibit dense waterproof performance and salt-insulating performance. Prevention performance of water permeability coefficient of about 0.8 × 10 ^-11 cm / sec by waterproof performance test, and degree of salt penetration not seen in internal concrete in 60-day immersion test in artificial seawater in salt penetration promotion test described later It is provided with the salt-blocking performance.

  According to the invention, the fiber reinforced cement board has a thickness of 2 to 10 mm. If the thickness of the fiber reinforced cement board is less than 2 mm, it is difficult to manufacture the fiber reinforced cement board having the above-mentioned bending strength and shear strength. If the thickness is more than 10 mm, the weight becomes heavier and easy to handle. As a result, the construction of the cement board layer becomes difficult and the thickness of the entire pavement becomes too large.

  According to the waterproof structure of the floor slab pavement of the present invention, by providing a waterproof layer with a simple structure having a considerable strength against reflection cracks that are not affected by cracks generated in the concrete slab, deterioration of the concrete slab is prevented. It can suppress effectively and can improve the durability of the concrete floor slab easily.

  A preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings. As shown in FIG. 1, the waterproof structure 10 of the floor slab of the present embodiment is laid on the upper surface of the floor slab 11 and above the concrete slab 11 installed on the bridge surface portion of the bridge, for example. By providing a waterproof layer 15 interposed between the leveling layer 12 and the surface pavement 14 composed of the surface layer 13, for example, water due to rain water or the like that has poured onto the bridge pavement 14 causes the joints, pavement 14, etc. This is employed to ensure that the concrete floor slab 11 can be blocked after passing. In particular, the waterproof structure 10 of the present embodiment effectively avoids the occurrence of reflection cracks in the waterproof layer 15 due to the influence of cracks generated in the concrete floor slab 11, so It is provided so that deterioration of the concrete slab 11 due to intrusion can be suppressed and durability of the concrete slab 11 can be improved.

  As shown in FIG. 2, the waterproof structure 10 of the floor slab pavement of this embodiment is a bridge pavement 14 composed of a leveling layer 12 and a surface layer 13 with a waterproof layer 15 interposed on the upper surface of the concrete floor slab 11. In the floor slab pavement waterproofing structure 10 formed by laying the floor, the waterproof layer 15 is mainly composed of cement, and has a bending strength of 20 MPa or more and a shear strength of 18 MPa or more obtained by mixing reinforcing fibers. And a cement board layer 17 formed by laying a fiber reinforced cement board having a thickness of 2 to 10 mm in the vertical and horizontal directions.

  Further, according to this embodiment, the backup material 18 is interposed between the upper surface of the concrete floor slab 11 and the cement board layer 17, and the pavement adhesive 19 is interposed between the cement board layer 17 and the leveling layer 12. The fiber reinforced cement board 16 is laid.

  According to the present embodiment, the concrete floor slab 11 is, for example, placed on the upper surface of a plurality of bridge girders laid between bridge piers, for example, by placing concrete after placing reinforcing bars in a formwork and hardening the balustrade part. It is formed continuously with 27 etc. and constitutes the bridge surface portion of the bridge.

  Further, the bridge pavement 14 laid above the concrete floor slab 11 with a waterproof layer 15 interposed is constituted by a leveling layer 12 and a surface layer 13. The leveling layer 12 is a lower layer portion or a base layer portion of the bridge pavement 14 and corrects irregularities such as unevenness of the floor slab 11, the rest of the suspension piece, and the surplus of on-site welding. 13 and the pavement 14 have a role of improving stability and durability. For example, a modified asphalt mixture, a goose asphalt mixture, or the like is used to lay and form the pavement 14 at a thickness of, for example, about 30 to 50 mm. . The surface layer 13 is an upper layer portion of the bridge pavement 14 and is required to have high temperature durability, fatigue durability, etc. in addition to direct functions such as ensuring a comfortable driving performance of the vehicle and maintaining slip resistance against braking. For example, it is laid and formed with a thickness of, for example, about 30 to 50 mm using a drainage pavement mixture, a thermosetting asphalt mixture, or the like.

  In addition, between the leveling layer 12 and the surface layer 13, they are effectively bonded, and play a role of resisting shearing force due to deformation of the floor slab 11 or braking of the traveling vehicle. For example, asphalt emulsion or rubberized asphalt A tack coat made of an emulsion can be appropriately laid and used. In addition, a surface treatment layer can be appropriately provided on the surface of the surface layer 13 for the purpose of increasing slip resistance or coloring. Further, the bridge pavement 14 is appropriately provided with joint members at the contact portion between the pavement 14 and a structure such as a ground cover and a drainage basin, in addition to the telescopic device part.

  And according to this embodiment, the waterproof layer 15 interposed between the concrete floor slab 11 and the bridge pavement 14 includes the cement board layer 17 by the fiber reinforced cement board 16, the cement board layer 17, and the concrete floor slab 11. And a pavement adhesive 19 interposed between the cement board layer 17 and the leveling layer 12.

  The fiber reinforced cement board 16 used in the present embodiment is formed by mixing, for example, high strength vinylon fiber having a tensile strength of 9 cN / dtex or more as a reinforcing fiber, for example, a high bending strength of 20 MPa or more and a pressure of 18 MPa or more. It has high shear strength. Moreover, since the thickness is as thin as 2 to 10 mm, it is a lightweight and easy-to-handle member, and has physical properties that allow easy cutting and the like on site. Such a fiber reinforced cement board 16 can be easily mass-produced as a papermaking board manufactured by, for example, a papermaking method (principle of Japanese paper scraping).

  That is, the fiber reinforced cement board 16 is manufactured according to the following process, for example, as shown in FIG. 1) The material and water are put into the mixing tank 21 to make a slurry. 2) The slurry is introduced into a bat (tank) 22, crushed on a rotating mesh 23, and then transferred to the felt 24. 3) The solid sheet on the felt 24 is wound around the making roll 25 to a predetermined thickness. 4) The plate that has reached a predetermined thickness is opened on a flat surface and subjected to press dewatering by the press device 26. 5) Curing (about 2-4 weeks) After drying, it is cut.

  As the fiber-reinforced cement board 16 formed in this way, more specifically, for example, a trade name “Powerlon Board” (manufactured by Kuraray Co., Ltd.), which is a tough cement board, can be used.

  Moreover, according to this embodiment, the water absorption regulator which controls the water absorption of the said fiber reinforced cement board 16 can also be apply | coated to the surface of either or both of the fiber reinforced cement board 16. FIG. By applying a water absorption adjusting agent to the surface of the fiber reinforced cement board 16, the adhesive strength with the backup material 18, the pavement adhesive 19, etc. accompanying the water absorption of the fiber reinforced cement board 16 is reduced, and the bending strength is reduced. It is possible to avoid inconveniences such as lowering. Here, as the water absorption adjusting agent, a water-soluble liquid having an ethylene vinyl acetate copolymer emulsion as a main component can be preferably used. For example, the water absorption adjusting agent is diluted with a predetermined dilution ratio on the surface of the fiber reinforced cement board 16. Can be applied.

  Furthermore, according to this embodiment, mesh-like unevenness having a height of 0.1 to 1.0 mm and an interval of 1.0 to 5.0 mm is provided on one or both surfaces of the fiber reinforced cement board 16. Can also be formed. By forming mesh-like irregularities on the surface of the fiber reinforced cement board 16, it is possible to improve the adhesion of the fiber reinforced cement board 16 to the backup material 18, the pavement adhesive 19, and the like. Here, the mesh-like unevenness can be easily formed by interposing an unevenness forming member such as a wire net when press dewatering in the manufacturing process of the fiber reinforced cement board 16, for example.

  And according to this embodiment, for example, the fiber reinforced cement board 16 formed in a rectangular shape with a size of about 900 mm in length and about 1800 mm in width is carried into the construction site, and is appropriately cut and backed up as necessary. On the upper surface of the concrete floor slab 11 on which the material 18 is laid, for example, a plurality of laid-out lines are laid out vertically and horizontally with a water blocking material 20 (see FIG. 4) interposed between adjacent boards 16. A cement board layer 17 is formed by the fiber reinforced cement board 16.

  Here, as the water stop material 20 interposed between the adjacent boards 16, for example, as shown in FIGS. 4A to 4C, a rubber water stop joint 20a or a gap between the adjacent boards 16 is used. Various known water-stopping materials, such as an acrylic resin-based water-stopping agent 20b to be injected, and a water-stopping plate 20c that is bonded and installed so as to cover a gap between adjacent boards 16, can be used.

  Further, the backup material 18 interposed between the cement board layer 17 and the concrete floor slab 11 is made of, for example, resin mortar, a resin adhesive, etc. The layer 17 and the concrete floor slab 11 are integrated with no gap. Moreover, when the backup material 18 newly installs the bridge pavement 14, after performing the blasting etc. suitably on the upper surface of the concrete floor slab 11 after the completion of the placement, for example, about 0.1 to 10 mm. Layed in thickness. On the other hand, when the bridge pavement 14 or the floor slab 11 is only partially repaired or thickened, the pavement is removed and the upper surface of the floor slab 11 is subjected to blasting or the like. It is laid with a thickness of about 10 mm.

  For example, when placing concrete to form the concrete slab 11, the fiber reinforced cement board 16 is laid on the surface of the placed concrete before the concrete is hardened. Adhesive strength between the board layer 17 and the concrete floor slab 11 can be sufficiently obtained, and these can be sufficiently integrated. In such a case, the cement board layer 17 and the concrete floor can be obtained. It is not always necessary to interpose the backup material 18 between the plate 11.

  Further, the pavement adhesive 19 interposed between the cement board layer 17 and the leveling layer 12 is made of, for example, asphalt emulsion (PK-4), rubber-containing asphalt emulsion (PKR-T) or the like. It functions to effectively adhere to the layer 12 and to the construction seam of the leveling layer 12. Prior to the construction of the bridge pavement 14, the pavement adhesive 19 is laid on the upper surface of the cement board layer 17 by the plurality of fiber reinforced cement boards 16 arranged in a thickness of, for example, about 0.1 to 10 mm. The

  According to the present embodiment, as shown in FIG. 1, the waterproof layer 15 is provided so as to extend to the connection step portion 28 between the concrete floor slab 11 and the balustrade portion 27. Further, an end protection layer 29 made of, for example, asphalt molding joint material and asphalt is provided across the connection stepped portion 28 and the balustrade portion 27 so as to cover the waterproof layer 15 in the extended portion.

  And according to the waterproof structure 10 of the floor slab pavement of this embodiment having the above-described configuration, the concrete floor slab is effectively avoided by preventing the occurrence of reflection cracks in the waterproof layer 15 and blocking the passage of water. It becomes possible to easily improve the durability. That is, according to this embodiment, the waterproof layer 15 interposed between the concrete floor slab 11 and the bridge pavement 14 is mainly composed of cement and has a pressure of 20 MPa or more obtained by mixing high-strength vinylon fibers. Since it has the cement board layer 17 by the fiber reinforced cement board 16 having a bending strength and a shear strength of 18 MPa or more, the fiber reinforced cement board 16 is waterproofed under the influence of cracks generated in the concrete floor slab 11. It is possible to effectively avoid the occurrence of reflection cracks that cause cracks in the layer 15, thereby suppressing deterioration of the concrete slab 11 due to water intrusion into the concrete slab 11, and The durability of the concrete slab 11 can be easily improved.

  Moreover, according to this embodiment, since the fiber reinforced cement board 16 which comprises the waterproof layer 15 is a cement product, it is equipped with the linear expansion coefficient substantially the same as the concrete floor slab 11, Therefore, the concrete floor slab 11 It is possible to easily achieve strong joint integration between the waterproof layer 15 and the waterproof layer 15 and stably support the load from the road surface together with the bridge pavement 14 and the concrete floor slab 11 by the large bending strength. Is possible.

  The present invention is not limited to the above-described embodiment, and various modifications can be made. For example, the reinforcing fiber mixed into the fiber reinforced cement board does not necessarily need to be a high-strength vinylon fiber, and other various reinforcing fibers can be mixed to form a fiber reinforced cement board. The present invention can also be applied to floor slab paving provided on other concrete floor slabs in addition to floor slab paving in concrete floor slabs installed on a bridge surface portion of a bridge.

  The fiber reinforced cement board constituting the waterproof structure of the present invention was tested for waterproof performance and salt shielding performance.

(Waterproof performance test)
A “Powerlon board” (trade name) having a thickness of 8 mm was used as the fiber reinforced cement board, and a 3-fold dilution of the water absorption adjusting agent was applied to the back surface thereof (application amount: 150 g / m ² ). The fiber reinforced cement board is cut out so that the inner diameter of the fiber reinforced cement board becomes a circle of 100 mm, and is placed on the bottom surface of the compression specimen creation mold so that the water absorption adjusting agent application surface is in contact with the concrete, and then 30-8-20N as concrete. Ordinary concrete was placed up to a height of 100 mm inside the mold. The specimen was demolded one day after the material age, and after four weeks of wet air curing, the sample was further conditioned for four weeks indoors.

The obtained specimen was attached to a pressure vessel using a mixture of epoxy resin adhesive, paraffin and rosin (mass ratio 1: 1). After sealing the pressure vessel, water was injected into the space above the vessel. Thereafter, a water pressure of 10 kg / cm ² was applied for 7 days using nitrogen gas. After pressurization, the specimen is split and the penetration depth of the water is measured from the penetration depth of the concrete into the concrete by using the concrete permeability test method “input method”. Asked. As a result of converting the hydraulic conductivity from the obtained diffusion coefficient, the hydraulic conductivity of the fiber-reinforced cement board was estimated to be 0.8 × 10 ⁻¹¹ cm / sec. In addition, the water permeability coefficient of general concrete is set to about 3.0 × 10 ⁻¹⁰ cm / sec.

  From the estimated water permeability, it is found that the fiber-reinforced cement board of the present invention can form a waterproof layer and exhibit sufficient waterproof performance.

[Salt penetration test]
Using a fiber reinforced cement board 50 similar to the fiber reinforced cement board 16 used in the above embodiment, as shown in FIG. 5, the mold is assembled (10 cm × 10 cm) so that the external dimensions are 10 cm × 10 cm × 40 cm. The composite specimen 52 was made by placing concrete 51 inside. A water absorption adjusting material diluted to a predetermined concentration (three times) was previously applied to the concrete bonding surface of the fiber reinforced cement board 50 (twice coating). The concrete 51 was 30-8-20N ordinary concrete. An epoxy resin was applied to the composite specimen 52 other than two 10 cm × 40 cm side surfaces (salt-penetrating surface).

  The specimen 52 was cured in standard water until the age of 38 days, was cured in air for 7 days, and then immersed in an artificial sea having a chloride ion concentration of 1.8%. After 60 days, the core 53 was collected and the amount of chloride ions in the concrete portion was measured. The method for measuring the amount of chloride ions was in accordance with “Analytical Method for Salt Contained in Hardened Concrete” (Japan Concrete Institute Standard Draft).

  From the measurement results of the amount of chloride ions, the amount of chloride ions in the concrete part hardly changed before and after immersion in artificial seawater, so even if immersed in artificial seawater for 60 days, fiber reinforced cement board It turns out that no salt penetration through 50 is seen.

It is a schematic sectional drawing explaining the structure of the waterproof structure of the floor slab pavement which concerns on one Embodiment of this invention. It is a partial expanded sectional view explaining the structure of the waterproof structure of the floor slab pavement which concerns on one Embodiment of this invention. It is explanatory drawing of the manufacturing process of a fiber reinforced cement board. (A)-(c) is sectional drawing which illustrates the water stop material interposed between adjacent boards. It is explanatory drawing of a salt penetration promotion test.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Waterproof structure of floor slab pavement 11 Concrete floor slab 12 Leveling layer 13 Surface layer 14 Bridge pavement 15 Waterproof layer 16 Fiber reinforced cement board 17 Cement board layer 18 Backup material 19 Pavement adhesive 20 Water stop material

Claims (8)

In the waterproof structure of the floor slab pavement formed by laying a pavement consisting of a leveling layer and a surface layer with a waterproof layer interposed on the upper surface of the concrete slab,
The waterproof layer is mainly composed of cement, and has a bending strength of 20 MPa or more obtained by mixing reinforcing fibers and a shear strength of 18 MPa or more, and a fiber reinforced cement board having a thickness of 2 to 10 mm vertically and horizontally. Waterproof structure of floor slab pavement with cement board layers formed side by side. The waterproof structure of a floor slab pavement according to claim 1, wherein a water absorption adjusting agent that regulates water absorption of the fiber reinforced cement board is applied to one or both surfaces of the fiber reinforced cement board. The waterproof structure for floor slab pavement according to claim 1 or 2, wherein the water absorption adjusting agent is a water-soluble liquid mainly composed of an ethylene vinyl acetate copolymer emulsion. The mesh-like unevenness | corrugation whose height is 0.1-1.0 mm and a space | interval is 1.0-5.0 mm is formed in the surface of either or both of the said fiber reinforced cement board. The waterproof structure of the floor slab pavement according to any one of 3 above. The waterproof structure of a floor slab pavement according to any one of claims 1 to 4, wherein the fiber reinforced cement board has a tensile strength of 8 MPa or more. The fiber-reinforced cement board contains 1 to 7% by weight of reinforcing fibers having a fineness of 6 to 30 dtex, a tensile strength of 9 cN / dtex or more, and a fiber length of 6 to 20 mm. Waterproof construction of floor slab paving. The waterproof structure of a floor slab pavement according to any one of claims 1 to 6, wherein the fiber-reinforced cement board is laid out vertically and horizontally with a waterstop interposed between adjacent boards. The fiber reinforced cement board is laid with a backup material interposed between the upper surface of the concrete floor slab and the cement board layer, and a pavement adhesive interposed between the cement board layer and the leveling layer. The waterproof structure of the floor slab pavement according to any one of claims 1 to 7.

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