JP2000001821A - Floor-slab waterproof structure and execution method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve workability by coating the upper section of a floor slab with specific quantities of a waterproofing material layer, in which a nonwoven fabric using hydraulic cement and a synthetic-resin emulsion having specific properties as base compounds is buried, and a tack coat layer and conducting asphalt pavement. SOLUTION: The upper section of a reinforced-concrete floor slab 1 is coated with a cold hydration solidification type waterproofing material in 1.5-3 kg/m2 using hydraulic cement and a synthetic resin emulsion having a glass transition point of -30-20 deg.C as base compounds through a primer layer 2, and a coating layer 3 is formed. A reinforcing material such as a nonwoven fabric 4 is stuck onto the layer 3 and impregnated with the waterproof material, the layer 3 is coated with the waterproofing material in 0.5-2 kg/m2 and a coating layer 5 is formed, and the total quantity of the waterproofing material is set in at least 2 kg/m2. A rubber asphalt emulsion in 0.3-0.5 kg/m2 is applied and a tack coat layer 7 is formed, and asphalt pavement 8 is executed. Accordingly, since there is no heating melting process as seen in asphalt in a waterproof layer, work environment can be improved, and the sure waterproof layer can be formed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a waterproof structure for a reinforced concrete floor slab such as an elevated road or a road bridge, and a method for constructing the waterproof structure.

[0002]

In order to prevent rainwater from penetrating into the concrete slab due to deterioration or cracking of the asphalt mixture of the pavement, a waterproof layer is provided on the slab, and the waterproof layer is formed on the slab. The construction method of constructing pavement material such as asphalt mixture is becoming widespread. As a method of constructing the waterproof layer, there are a flow spreading method in which a sheet-based waterproof material impregnated with rubber asphalt is stuck with molten asphalt, a welding method in which a sheet-based waterproof material is stuck with an adhesive, a so-called molten rubber asphalt. There are many heating-type coating methods that apply heated asphalt, and solvent-type coating methods that apply chloroprene with a solvent added.
Most of the waterproofing materials use heated asphalt or solvent type synthetic rubber. In the casting method and the heating type coating method, it is necessary to heat and melt the asphalt, and there is a problem in health safety due to burns due to heating of workers and inhalation of steam. In addition, there is a problem in environmental science due to emission of carbon dioxide due to combustion. In the welding method and the solvent-type coating method, there is a problem in the safety of workers due to the inhalation of steam due to the inclusion of an organic solvent. Furthermore, there is a problem of environmental pollution due to the diffusion of the organic solvent. The present invention provides a room temperature waterproofing method and a waterproofing structure that does not use a heating operation or an organic solvent that generates harmful vapor on site.

[0003]

SUMMARY OF THE INVENTION The present invention relates to a reinforced concrete slab (including a prestressed reinforced concrete slab).
An asphalt mixture pavement is formed by forming a room temperature hydrated solidification type waterproofing material layer and a tack coat layer embedded with a nonwoven fabric as a reinforcing material. The waterproofing material withstands a large load, is flexible even at low temperatures, and preferably has excellent crack followability.In the present invention, the hydraulic cement and the glass transition point (Tg) are in the range of −30 to −20 ° C. The same amount (weight ratio) of the elongation type synthetic resin emulsion is used. Components generally added to cement mortar, such as a filler such as calcium carbonate, an antifoaming agent, a thickener, and a fluidizer, can be appropriately used in the waterproofing material. The synthetic resin emulsion is preferably a styrene acrylic or ethylene vinyl acetate emulsion whose resin solid content is adjusted to a range of 45 to 55% by weight. The waterproofing material can be further enhanced by applying the waterproofing material in two separate coats. To 2 to 5 kg / m ² . That is, the first application amount is 1.5
~ 4kg / m ² , the second application amount is enough to hide the non-woven fabric
It is good to be 0.5-1 kg / m ² . 1.5kg /
m other sufficient waterproof performance becomes insufficient impregnation of the nonwoven fabric is ² or less can not be secured. On the other hand, if it exceeds 4 kg / m ² , workability deteriorates and irregularities easily occur, drying time is prolonged and work efficiency is reduced. After the surface of the waterproofing material layer is hardened, a rubber asphalt-based emulsion is applied as an asphalt tack coat layer in an amount of 0.3 to 0.5 kg / m ^2, and then the asphalt mixture paving material is applied by a conventional method. It should be noted that if there is no risk of bubbles being generated from the floor slab concrete and the concrete has a good water content, the primer treatment is not necessary, but the primer treatment can be performed if necessary.
As the primer, an ethylene vinyl acetate or acrylic synthetic resin emulsion having a resin solid content of 5 to 25% by weight can be used. No effect at less than 5% by weight, 25% by weight
Above, the workability is deteriorated and delamination is likely to occur.

[0004]

EXAMPLE As shown in FIG. 1, a primer layer 2 was prepared by diluting a solid content of an ethylene vinyl acetate synthetic resin emulsion (Hyflex HF-1000 manufactured by Nippon Kasei Co., Ltd.) to 15% by weight on the surface of a floor slab concrete 1. Applied. After the primer layer dries, apply a normal temperature hydrated and coagulated waterproof material at a thickness of ² kg / m2 with a roller 3 and immediately apply a polyester / nylon composite nonwoven fabric (Zolk 50H made by AZOK in the Netherlands) 4 to impregnate the waterproof material And integrate it, and add one more waterproof material.
The coating 5 was applied at a thickness of kg / m ² to form a waterproof material layer 6. Room-temperature waterproofing material, hydraulic cement is 100 parts by weight of ordinary Portland cement (manufactured by Nippon Cement) 100 parts by weight of powder consisting of 50 parts by weight of 90-mesh calcium carbonate powder and 50 parts by weight of No. 7 silica sand as filler And 100 parts by weight of an ethylene-vinyl acetate synthetic resin emulsion having a glass transition point (Tg) of −25 ° C. and a solid content of 50% by weight. Rubber asphalt emulsion (Hulcoat 8 manufactured by E-Tech)
5) was applied to form a tack coat layer 7 by applying 0.3 kg / m ² , and two hours later, a pavement 8 of an asphalt mixture was applied by a conventional method.

(Comparative Example 1) In the above example, the glass transition point was −15 with respect to 100 parts by weight of hydraulic cement powder as a waterproof material.
Styrene acrylic emulsion with solid content of 50% by weight at ℃
The construction was carried out in exactly the same manner except that a mixture of 100 parts by weight was used.

(Comparative Example 2) In the above example, an ethylene vinyl acetate emulsion 115 having a glass transition point of 0 ° C and a solid content of 52% by weight was added to 100 parts by weight of hydraulic cement as a waterproof material.
The construction was carried out in exactly the same manner, except that parts consisting of parts by weight were used.

(Test Results) Table 1 shows the comparison between the above-mentioned example products and the above-mentioned respective comparative examples and floor slab waterproof quality standards (Japan Road Association, floor slab waterproof design and construction materials). The * mark in the table indicates the quality standard of the waterproof layer for the bridge deck of the Japan Highway Public Corporation.

[0008]

【table 1】

[0009] The shear performance and adhesive strength when no tack coating treatment was performed in the examples are shown in Table 2, and the effect of the tack coating layer is clear.

[0010]

[Table 2]

[0011]

[Effect] The waterproofing method of the present invention uses a composition composed of hydraulic cement and an elongation type synthetic resin emulsion as a waterproofing material layer, so there is no heating and melting step as in asphalt. Health safety is also ensured. Furthermore, since there is no emission of carbon dioxide due to combustion, it is also preferable in environmental science. Also, since it does not contain an organic solvent, there is no problem of environmental pollution. The waterproof layer construction method can form a reliable waterproof layer without requiring special performance, and this waterproof layer does not crack against cracks in the underlying concrete because it uses an elongated synthetic resin emulsion. In addition, in addition to the tack coat layer, the waterproof performance and the adhesion to the asphalt mixture pavement material can be secured to the same degree as the conventional heat-type paint film waterproof material and sheet-based waterproof material.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a model of a waterproof structure according to the present invention.

[Explanation of symbols]

 1 Floor slab concrete 2 Primer layer 3 First application 4 Non-woven fabric 5 Second application layer 6 Waterproof material layer 7 Tack coat layer 8 Asphalt pavement

 ──────────────────────────────────────────────────の Continued on front page (72) Inventor Takuyuki Hashimoto 1-6-4 Taito, Taito-ku, Tokyo F-term in Civil Engineering Research Center (reference) 2D059 AA14 CC04 GG02 4G012 MC01 PB26 PB30 PB38

Claims (2)

[Claims] 1. A waterproof material layer mainly composed of hydraulic cement and a synthetic resin emulsion having a glass transition point in a range of −30 to −20 ° C. is formed on a reinforced concrete floor slab, and is reinforced in the waterproof material layer. A floor slab waterproof structure in which materials are buried, and asphalt mixture pavement material is applied to the surface through a tack coat layer of a rubber asphalt-based emulsion. 2. A hydraulic cement on a reinforced concrete floor slab.
Glass having a glass transition point of -30 to -20 ° C.
1.5 to 3 kg / m of waterproofing material layer mainly containing lujon ^TwoApply with
The nonwoven fabric as an impregnating material
Process, and furthermore, 0.5 to 2 kg / m of the waterproof material^TwoApply and waterproof
At least 2kg / m^TwoOf forming a waterproof layer
And a rubber asphalt emulsion on the waterproof material layer
Tack coat layer 0.3-0.5kg / m^TwoCoating process and ass
The process of pavement of the pharto mixture
Construction method of floor slab waterproof structure.