JP2002192103A - Rubber asphalt waterproofing method - Google Patents

Abstract

(57) [Problem] To form a waterproof layer having sufficient waterproof strength without dripping or swelling when applied even to a steep slope having good adhesion to a base. The solid content is 50 to 70% on a synthetic fiber base fabric having elongation of at least 150% in at least one direction.
A primer layer having a viscosity of 500 to 1500 cps / 30 ° C. or a rubber layer containing 100 to 50 parts of the rubber asphalt emulsion and a primer prepared by mixing 10 to 50 parts of a water-hardened cement powder was sprayed into the base cloth and adhered to the base. Then, an anionic rubber asphalt emulsion and a polyvalent metal salt aqueous solution are separately sprayed on the primer layer to infiltrate the base fabric to some extent, adhere to the primer, and form a waterproof layer on the surface.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an industrial waste disposal site,
Related to the waterproofing method of normal temperature construction using rubber asphalt emulsion used for reservoirs, underground structures, etc. Specifically, it has good adhesion to the groundwork, does not drip even when applied to steep slopes, and thick coating The present invention relates to a spray waterproofing method capable of forming a tough waterproof coating film having properties such that the coating film does not swell even at times.

[0002]

2. Description of the Related Art Conventionally, waterproofing to a steep slope such as an industrial waste disposal site has usually been performed by spraying with a spray because of poor scaffolding. However, because of a steep slope and a large film thickness. There is a problem that the coating film drips at the time of application. To solve the problem, an airless type of an anionic rubber asphalt emulsion having a solid content of 70% or more and a polyvalent metal aqueous solution such as calcium chloride, calcium nitrate and aluminum chloride as a coagulant are used. A method of instantly forming a waterproof coating film on a waterproof surface simultaneously with spraying has been adopted. (See, for example, JP-A-11-107298)

[0003] However, this method is good as a method for forming a thick film without sagging, but it is said that a rubber asphalt emulsion alone has a sufficient tensile strength even if a coating film of a waterproofing material has sufficient elongation. There is a drawback, so that a base cloth made of a fiber sheet has been laid in advance on a base and sprayed.

However, it is possible to form a rubber asphalt emulsion coating film on the base fabric because of the instantaneous solidification of the anionic rubber asphalt emulsion and the aqueous polyvalent metal solution. However, it was not possible to adhere to the base layer on the surface of the base cloth, causing a shift between the base and the base cloth, and the base cloth and the coating film being damaged by friction between the base and the base cloth. In this method, 70%
In order to synthesize the above high-concentration anionic rubber asphalt emulsion, to heat-melt asphalt, or to emulsify rubber and hot-melt asphalt, it is not common that special emulsion synthesis equipment is required, In addition, the instant setting is good at a concentration of 50 to 70%, which can be easily achieved by mixing a commercially available rubber asphalt emulsion, but when a thick film of 5 to 10 mm is formed by a single application, contact coagulation with a coagulant is required. As a result, there is a problem that the generated water increases and the generated water causes swelling.

[0005]

Accordingly, the present inventors have addressed the problems of the prior art as described above, solved the problems, fully impregnated the base cloth, adhered to the base, and added The present inventors have conducted intensive studies to find a method of obtaining a 50 to 70% concentration anionic rubber asphalt emulsion which can be easily synthesized with a commercially available emulsion blend without causing sagging or swelling and having a sufficient waterproof strength.

The present invention has been achieved as a result of the above study,
In particular, by finding the physical properties of the fibrous material as a reinforcing material of the waterproofing material and the use of predetermined materials for the primer, the rubber asphalt emulsion, and the hardening agent of the waterproofing material, the above-mentioned study subjects are satisfied and the strength of the waterproofing material is excellent. It is another object of the present invention to provide a waterproofing method which is excellent in adhesion to a substrate.

[0007]

That is, a feature of the present invention that meets the above-mentioned object is that, first, basically, as described in claim 1, 150% in at least one direction.
Using a synthetic fiber base cloth having the above elongation as a reinforcing material, a solid content of 50 to 70% and a viscosity of 500 to 1500 cp are formed on the base cloth.
s / 30 ° C. rubber asphalt emulsion or 100 parts of rubber asphalt emulsion is sprayed with a primer in which 10 to 50 parts of hydraulic cement powder is blended, and a waterproof layer is formed on the primer layer which has permeated the base cloth and adhered to the base. Is to form

[0008] The invention of claim 2 is that an anionic rubber asphalt emulsion having a solid content of 50 to 70% and an aqueous solution of a polyvalent metal salt of 1 to 15% are simultaneously sprayed on the primer layer using separate sprays, An object of the present invention is to form a waterproof layer on the primer layer by bringing the rubber asphalt emulsion and the aqueous polyvalent metal salt solution into contact with each other until the coating liquid reaches the primer layer and curing the mixture.

[0009] Claims 3 and 4 relate to a reinforcing material base fabric used in the waterproofing method. Claim 3 is a preferable characteristic thereof, which is 100 N / cm or more in the vertical direction and 50 N / cm in the horizontal direction.
Having the above tensile strength and elongation at break of 50% in the longitudinal direction
Hereinafter, a fiber sheet made of synthetic fiber having a thickness of 1 to 5 mm, which is 150 to 400% in the horizontal direction, and a preferable fiber of the base fabric is made of 100% polyester.

[0010]

Embodiments of the present invention will be described below in detail. The present invention relates to a method for forming a waterproof coating layer by spraying rubber asphalt on a steep slope or the like. A base cloth is disposed as a reinforcing material on a surface of a base rock, mortar, concrete, or the like, and the base cloth is formed. The coating is performed by spraying and coating a predetermined overcoating material and undercoating material, each of which forms a waterproof layer thereon, to form a waterproof coating layer.

[0011] Here, the base cloth used on the base is to use an air spray sprayed with a high pressure because when the primer is sprayed thereon, the texture of the base cloth is expanded and the primer is easily impregnated into the base cloth. Therefore, it is preferable that the primer impregnates the base cloth and adheres to the base, and it is effective that the primer has an elongation of at least 150% in at least one direction.

In particular, thicknesses 1 to 5 having a tensile strength of 100 N / cm in the longitudinal direction and 50 N / cm in the lateral direction, and a breaking elongation of 50 or less in the longitudinal direction and 150 to 400% in the lateral direction.
mm is preferred. As the fiber material, various synthetic fiber sheets such as woven fabric, non-woven fabric and knitted fabric can be used. In particular, 100% polyester fabric is the most practical and effective. It is.

On the other hand, a commercially available rubber asphalt emulsion is used as a base material for an overcoating material (coating solution) and an undercoating material (primer) for forming a waterproof layer by spraying onto the base fabric surface. Among them, only an anionic rubber asphalt emulsion is used. The undercoat material (primer) is not particularly limited, such as anionic, cationic, and nonionic. The anionic rubber asphalt emulsion of the anionic rubber asphalt emulsion used for the overcoating material and the undercoating material is commercially available as an asphalt emulsifier and can be easily obtained. Solid content of 50 to 50 emulsified using a surfactant such as sodium sulfonate
70% emulsion.

The rubber latex to be mixed includes styrene butadiene rubber, chloroprene rubber, natural rubber and the like. Styrene butadiene rubber is preferably used as a rubber asphalt waterproofing material from the viewpoint of cost, performance and availability. The mixing ratio of rubber and asphalt is not particularly limited, but is preferably about 10/90 to 40/60 from the viewpoint of waterproof performance. Among them, it is important that the primer as the undercoat material has good adhesion to the overcoat waterproof layer and the base rock, mortar, concrete, etc., and good impregnation with the base cloth. With viscosity of 500 ~ 15
A rubber asphalt emulsion of 0 cps / 30 ° C. and a primer prepared by mixing 10 to 50 parts of hydraulic cement powder with 100 parts of the rubber asphalt emulsion are used.

Here, the hydraulic cement to be added to the rubber asphalt emulsion includes Portland cement, early-strength Portland cement, alumina cement and the like. These are usually powdered and mixed, and the hydraulic cement to rubber asphalt emulsion is used. Is 10 to 5 with respect to the solid content of the rubber asphalt emulsion.
0 parts is desirable. When the amount of the hydraulic cement is 50 parts or more, the pot life becomes short, and cracks easily occur in the formed film. If the amount is less than 10 parts, there is a disadvantage that solidification is delayed. Therefore, as described above, 1
0 to 50 parts is preferred.

When the primer is impregnated in the base cloth and the primer and the base cloth are entangled with each other, if the thickness of the primer layer is less than the thickness of the base cloth, no dripping occurs and a strong waterproof layer reinforced with the base cloth is formed. To form Therefore, it is preferable that the waterproof layer is sprayed from the base cloth with an airless type spray or the like so as to penetrate the base cloth and adhere to the base to have a thickness of about 2 to 3 mm.

On the other hand, a coating liquid (overcoating material) applied to the upper surface of the primer layer comprises an anionic rubber asphalt emulsion having a solid content of 50 to 70% obtained by mixing the commercially available rubber and asphalt emulsion, and a coagulant. 1 to 15% aqueous solution of a polyvalent metal salt, which are simultaneously sprayed from separate nozzles using an airless spray. At this time, the rubber asphalt emulsion and the aqueous solution of the polyvalent metal salt are contact-mixed with each other until the respective coating solutions reach the primer layer. Especially 2-3m
If m, the rubber asphalt waterproof layer can be instantaneously formed without swelling due to generated water.

In order to improve the instant solidification of the mixed anionic rubber asphalt emulsion with a coagulant, a surfactant such as potassium oleate, fatty acid soda and sodium alkylbenzene is added in an amount of 2% or less. It may be added. If the content is more than 2%, it is not preferable because the solidification may be incomplete or the formation of the coating film may be incomplete.

As the coagulant for the anionic rubber asphalt emulsion, a coagulant that instantaneously destroys the anionic rubber asphalt emulsion is used. Specifically, an aqueous solution of a polyvalent metal salt such as calcium chloride, magnesium chloride, zinc chloride, and aluminum chloride is used.
The concentration is usually 1 to 15%, preferably 2 to 10%.
It is. The ratio of the coagulant to the rubber asphalt emulsion varies depending on the type and concentration of the base agent / coagulant, but the volume is preferably about 1/5 to 1/3. If the coagulant is out of the above range, it is difficult to obtain a preferable waterproof layer because the coagulation of the rubber and asphalt emulsion is incomplete, and the amount of water generated by coagulation becomes large.

The above-mentioned coating solutions, which are the undercoating material and the overcoating material, are sprayed on the base cloth and the primer layer by spraying, respectively, to form a waterproof layer. An airless type spray is generally used as the spray used for this spraying, but this airless type spray is not special and may be any as long as it has a capability of a maximum discharge pressure of about 100 kg / cm ^2. . When the discharge pressure is low, for example, 10 kg / cm ² or less, the straightness of the waterproof material is reduced, the permeability to the base fabric is reduced, and the adhesion to the base material is reduced. .

[0021]

EXAMPLES Hereinafter, specific embodiments of the present invention will be described with reference to examples.

First, a commercially available styrene-butadiene rubber (anionic SBR) and an asphalt emulsion (anionic asphalt) were mixed and stirred in the composition shown in Table 1 below to obtain a base material for an overcoat material and an undercoat material, respectively.

[0023]

[Table 1]

On the other hand, Table 2 shows an example of the composition of the main component of the hydraulic cement compounding system and the hydraulic cement powder used as the undercoat material.

[0025]

[Table 2]

Example 1 Using a slate plate as a base, the slate plate was leaned at a gradient of 90 degrees, and 100% of polyester had a tensile strength of 100 N / cm in the vertical direction and 50 N / cm in the horizontal direction, and A 3 mm-thick base cloth having a breaking elongation of 50% in the vertical direction and 250% in the horizontal direction was set up, and the upper portion was fixed with tape.

Next, the undercoating materials of Tables 1 and 2 were each sprayed with an air spray at a discharge pressure of 100 kg / cm ² and a thickness of about 3 mm at a distance of 40 cm between the spray gun and the base cloth so that the weave of the base cloth was hidden. And dried for 24 hours. After drying, the undercoating material showed no dripping or swelling, penetrated into the base fabric, and adhered well to the slate. The adhesion to the slate was 3.5 kg / 25 mm for the undercoat material in Table 1, and Table 2
4.5kg / 25mm in the case of hydraulic cement compounding system
Met. On the other hand, when the base fabric having 50% elongation in both the vertical and horizontal directions was sprayed by air spray using the same method as described above, the base fabric did not penetrate and the adhesive strength to the slate could not be measured.

Example 2 The main agent and the coagulant of the overcoating material shown in Table 1 were air-sprayed, and the main agent and the coagulant were simultaneously sprayed using a three-head gun, and the main agent discharge pressure was 100 kg / cm ² and the coagulant was discharged. At a pressure of 50 kg / cm ² ,
6 L / min of main agent and 1 L / m of coagulant at 0 cm distance
The coating was sprayed at a speed of in so that the thickness of the coating film became 2 mm. The sprayed rubber asphalt waterproof layer did not sag or swell, and the tensile strength of the formed layer after drying for 10 days was measured according to JIS K6251. The breaking strength was 10.6 kg / cm and the elongation was 450%. there were.
Further, the water permeability was measured by JIS A6910,
The weight was reduced by only 0.2 cc, and it was confirmed that the waterproofness was excellent.

Example 3 Next, an undercoating material was sprayed with the same formulation as in Example 2 for the hydraulic cement compounding system shown in Table 2. As in Example 2, there was no sagging or blistering, and the tensile strength of the formed layer after drying for 10 days was measured according to the formula of JIS K6251. As a result, the breaking strength was 13.2 kg / cm, and the elongation was 350%.
Met. Further, the water permeability was measured according to JIS A6910, but the water loss was reduced by only 0.2 cc, and it was confirmed that the waterproofness was excellent.

Comparative Example For further comparison, as shown in Example 2, a three-head gun in which the main agent and the coagulant of the overcoating material were sprayed directly on the base fabric by air spray as shown in Example 2 was used. make use of,
Discharge pressure of main agent 100 kg / cm ² , discharge pressure of coagulant 50
6 L / min of the main agent at a distance of 40 cm in kg / cm ² ,
The coagulant was sprayed at a rate of 1 L / min so that the thickness of the coating film became 2 mm. However, the overcoat material did not penetrate into the base fabric, and the adhesive strength of the slate could not be measured.

From the comparison between the above Examples and Comparative Examples, it can be seen that the waterproofing method according to the present invention improves the strength of the waterproofing material and also has an excellent adhesion to the substrate.

[0032]

As described above, according to the present invention, a base cloth having predetermined physical properties is used as a reinforcing material, and a primer and a rubber asphalt emulsion are sprayed using predetermined materials, respectively. The texture of the base cloth is expanded, the primer is easily impregnated into the base cloth, and the adhesion to the base is good, and the top coat material penetrates to some extent into the reinforcement base cloth, and adheres to the undercoat material (primer) and adheres to the surface. It has a remarkable effect of forming a waterproof layer and forming a reinforced strong waterproof layer without sagging and swelling.

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Atsushi Nakabayashi 4-1-1-21 Hamazoedori, Nagata-ku, Kobe Mitsusei Belt Co., Ltd. (72) Inventor Mitsuji Yoshino 589 Kitagawa, Nakatsu, Hirano-cho, Nishi-ku, Kobe City Hirotsuka Chemical Co., Ltd. Nakatsu Plant F-term (reference) 4D004 AA46 BB04 DA03 DA10 DA20 4F100 AA02C AA02H AE01B AE01H AK73B AK73C AL05B AL05C AM00B AM00C AN00B AN00C BA02 BA03 BA10A BA10C CA23B CA30C DE01B DE01H DG01A DG11A EH46 EJ82 GB90 JD05 JK02A JK08A JM01B YY00A YY00B

Claims (4)

[Claims] 1. A synthetic fiber base fabric having an elongation of at least 150% in at least one direction is used as a reinforcing material, and a solid content of 50 to 70% and a viscosity of 500 to 1500 cps / 30 are formed on the base fabric.
A primer containing 10 to 50 parts of hydraulic cement powder is sprayed on 100 parts of a rubber asphalt emulsion or 100 parts of a rubber asphalt emulsion at a temperature of 0 ° C. to form a waterproof layer on the primer layer that has penetrated into the base cloth and adhered to the base. Rubber asphalt waterproofing method. 2. An anionic rubber asphalt emulsion having a solid content of 50 to 70% and an aqueous solution of a polyvalent metal salt having a solid content of 1 to 15% are simultaneously sprayed on the primer layer according to claim 1 using separate sprays, A rubber asphalt waterproofing method, wherein a waterproof layer is formed on the primer layer by bringing the rubber asphalt emulsion and the aqueous solution of a polyvalent metal salt into contact with each other until the coating solution reaches the primer layer and curing the mixture. 3. The method according to claim 1, wherein the reinforcing material base cloth has a length of 100 N / cm or more.
A synthetic fiber sheet material having a tensile strength of 50 N / cm or more in a transverse direction and a breaking elongation of 50% or less in a longitudinal direction and 150 to 400% in a transverse direction and having a thickness of 1 to 5 mm. The rubber asphalt waterproofing method described. 4. The rubber asphalt waterproofing method according to claim 1, wherein the synthetic fiber base fabric is made of 100% polyester.