JP2001164666A - Waterproofing construction method for concrete surface - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a waterproofing construction method for a concrete surface capable of being treated in a short time without requiring the time for waiting for hardening of concrete and providing beautiful appearance. SOLUTION: A protection sheet composed of an improved asphalt layer and a surface decorative layer is brought into contact with the concrete surface through an improved asphalt face to soften the improved asphalt layer by hardening reaction heat of concrete so that the protection sheet adheres closely on the concrete surface. Since a section between the concrete surface and the protection sheet has a negative pressure when concrete is hardened, the protection sheet is bonded on the concrete surface in such a manner that it is sucked into the concrete to bond it powerfully by anchor effect. Moreover, since a polymer material having the decorative property is used on a surface of the protection sheet, waterproofing treatment and decorative treatment are completed simultaneously with concrete hardening.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for waterproofing a concrete surface, which can be treated in a short period of time without waiting for the concrete to harden, and which has an excellent appearance.

[0002]

2. Description of the Related Art Conventionally, it has been recognized that a sheet-based waterproofing material cannot be adhered to a concrete surface on which water is interposed. It was common sense to perform waterproofing after confirming that the value was less than the value. For example, the Japan Road Association's road bridge reinforced concrete floor slab waterproofing design and construction material states that the concrete surface should be sufficiently dried to a moisture content of 10% or less with a high-frequency moisture meter before the waterproof layer is provided. In other words, in the conventional method, the time required to complete waterproofing is the sum of the time required for curing the concrete, the time required for drying the concrete surface, and the time required for applying the waterproofing layer. there were. In particular, in the construction of existing bridges, elevated roads, and the like, it is desired to construct a concrete protective film in a short time because traffic is cut off and construction is performed.

On the other hand, as a method for waterproofing a concrete surface in a short period of time, Japanese Patent Application No. 11-104031 discloses a method in which an asphalt-based waterproof sheet is attached before hardening concrete, and the heat of hardening concrete is used. It discloses a method of softening an asphalt-based waterproof sheet and bringing it into close contact with a concrete surface. According to such a method, since it is not necessary to wait for the curing time of the concrete and the time required for drying the concrete surface, the construction period can be significantly reduced as compared with the conventional construction method. However, since the asphalt-based waterproof sheet is black, the cosmetic surface of the concrete surface is inferior, and the surface must be painted separately for indoor use such as flooring.

Accordingly, it is an object of the present invention to be able to carry out construction processing in a short time without waiting for the time for concrete to harden.
An object of the present invention is to provide a method for waterproofing a concrete surface with excellent aesthetics.

[0005]

Means for Solving the Problems As a result of intensive studies in view of the above object, the present inventors have found that the modified asphalt surface of a protective sheet having a modified asphalt layer and a surface decorative layer on the concrete surface before hardening is in direct contact. Then, the modified asphalt layer is softened by the heat generated when the concrete is hardened, and the waterproofing process and the decorative process are completed at the same time as the concrete is hardened by using the suction accompanying the hardening of the concrete to adhere to the unevenness of the concrete. The present inventors have found that the present invention can be performed, and arrived at the present invention.

In other words, the method for waterproofing a concrete surface according to the present invention does not require waiting for the curing time of the concrete and the time required for drying the concrete surface, and only requires the protective sheet to directly contact the concrete surface before hardening. Therefore, the construction period can be significantly shortened as compared with the conventional construction method. Furthermore, since concrete absorbs water vapor at the time of hardening, a negative pressure acts between the protective sheet and the concrete surface, and the modified asphalt layer has a feature of firmly bonding along the uneven surface of the concrete.

Further, since the surface of the protective sheet is made of a polymer material having a cosmetic property, unlike the conventionally used asphalt-based waterproof sheet, it is also suitable for applications requiring aesthetic appearance of concrete surfaces such as indoor floors. ing.

Another object of the present invention is to put a protective sheet composed of a modified asphalt layer and a decorative surface layer on a formwork of a concrete secondary processed product, then pour the concrete into the concrete formwork, and cure the concrete. This is a method in which the modified asphalt layer is softened by reaction heat and adhered to the concrete surface. According to the waterproofing construction method, since the construction surface is not limited to a flat surface, it is possible to waterproof the secondary concrete product such as a common groove or a block.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION The method for waterproofing a concrete surface according to the present invention is characterized in that a protective sheet having at least a modified asphalt layer and a decorative surface layer is brought into contact with the concrete surface with the modified asphalt surface, and heat is generated when the concrete is hardened. By using the suction accompanying the hardening of the concrete while softening the thermoplastic elastomer, FIG.
In this method, the protective sheet 2 is brought into close contact with the unevenness of the concrete 1 as shown in FIG.

The protective sheet used in the present invention has at least a modified asphalt layer 21 and a decorative surface layer 23.

The modified asphalt layer 21 has a softening point of 80-80.
A modified asphalt at 120C, preferably 90-110C is used. If the softening point is 120 ° C. or higher, the adhesion between the protective sheet and the concrete deteriorates, and if the softening point is 80 ° C. or lower, when the temperature of the pavement rises in summer, flow and rutting are generated, which is not preferable.

The thickness of the modified asphalt layer 21 is 0.5 to 0.5.
3.0 mm. When the thickness is more than 3.0 mm, the protective sheet becomes unnecessarily thick, and when the thickness is less than 0.5 mm, the adhesion to the concrete surface deteriorates, which is not preferable.

The surface decorative layer 23 is made of a weather-resistant resin having surface decorativeness. Examples of the resin that can be preferably used for the surface decorative layer include vulcanized butyl rubber, vinyl chloride, polyurethane, and acrylic resin. Of these, particularly preferred are vulcanized butyl rubber and acrylic resin.

The total thickness of the surface decorative layer is from 20 μm to
It is 1.5 mm, more preferably 50 μm to 1.0 mm. If it exceeds 1.5 mm, the adhesion to the concrete surface will be poor, and if it is 20 μm or less, the abrasion resistance will be poor, which is not preferable.

[0015] Between the modified asphalt layer and the surface decorative layer,
By providing another functional layer, the protective sheet may have a multilayer structure of three or more layers.

For example, when used as a floor material or the like, as shown in FIG. 3, a hard resin layer made of a hard vinyl chloride resin or the like having excellent abrasion resistance is provided between the modified asphalt layer 21 and the surface decorative layer 23. 24 can be provided. In this case, the thickness of the hard resin layer is preferably about 20 to 500 μm. If it is less than 20 μm, the effect of providing the hard resin layer cannot be obtained, and if it is more than 500 μm, the adhesion to the concrete surface becomes poor, which is not preferable.

If an irregular pattern is formed on the surface of the protective sheet as required, the surface is less likely to be scratched and has an anti-slip effect. In addition, the surface decorative layer may be colored using a commercially available pigment or colorant in order to provide a decorative effect on the surface.

The protective sheet is formed by laminating a surface decorative layer on a sheet of the modified asphalt, or as shown in FIG.
It can be produced by laminating the surface decorative layer 23 on the material immersed in the water. From the viewpoint of sheet strength and manufacturing suitability,
It is preferable to use a reinforcing core.

As the reinforcing core material, for example, a woven or nonwoven fabric made of heat-resistant polyester or aramid fiber can be used. However, it is necessary to select a reinforcing core material that is as flexible as possible so as not to hinder the adhesion to the uneven surface of the concrete.

As shown in FIG. 2, a release paper 3 may be stuck on the modified asphalt side of the protection sheet in order to improve the handleability of the protection sheet, and the release paper 3 may be peeled off during operation. preferable.

When waterproofing a flat surface such as a bridge, an elevated road, or a roof, a concrete layer may be formed by spraying or driving, and then the protective sheet may be brought into direct contact with the concrete surface.

As the concrete, those generally used as construction materials and earth-building materials can be used without particular limitation. Hardening of concrete depends on the type, environmental conditions such as temperature and humidity, etc. Generally, after forming concrete by spraying, driving, etc., setting of the cement component starts in about 10 minutes to about 30 minutes, Temperature 2
It reaches about 0 to 60 ° C.

Therefore, it is preferable that the protective sheet is brought into contact with the concrete surface within at least one hour after the concrete is formed, more preferably within 30 minutes, particularly preferably within 10 minutes.

After the contact, in order to increase the adhesion between the protective sheet and the concrete surface, it is preferable to press and defoam using an iron roller or the like.

Since concrete absorbs water (water vapor) at the time of hardening, a negative pressure is applied between the concrete surface and the protective sheet. Therefore, as shown in FIG. 1, the softened modified asphalt layer is bonded to the concrete in such a manner as to be sucked into the concrete, so that the layer can be strongly bonded by the anchor effect.

In the present invention, since the protective sheet is put on the concrete surface before hardening, the protective sheet functions as a heat storage sheet. For this reason, there is an effect of shortening the concrete hardening time as compared with the conventional construction method in which a waterproof sheet is put on after concrete hardening.

In order to produce a high-strength concrete floor slab, it is desirable to cure the concrete after the hydration of the concrete so that the water inside the concrete does not evaporate. Therefore, high strength concrete can be produced.

When the method for waterproofing a concrete surface according to the present invention is applied to a concrete processed product, as shown in FIG. 5, a modified asphalt layer is previously provided inside a formwork 5 of the concrete processed product. The above-mentioned protective sheet 2 may be stuck in such a manner that the concrete 1 is poured. In this case, since the construction surface is not limited to a flat surface, the construction surface is suitable for waterproofing secondary concrete products such as joint grooves and concrete blocks. In this case, it is preferable to apply the release agent 4 to the inside of the mold in order to easily remove the mold.

[0029]

The present invention will be described in more detail with reference to the following Examples, but it should not be construed that the invention is limited thereto.

Example 1 As shown in FIG. 4, a woven fabric 22 of aramid fiber was immersed in a modified asphalt 21 (manufactured by Shizuoka Bituminous Industry Co., Ltd.), and
A 1 mm thick vulcanized butyl rubber sheet 23 is laminated while heating at ℃, and then a release sheet 3 is adhered to the protective sheet.
Created 2. In addition, the thickness of the modified asphalt layer is 1 m.
m.

The cement ("Portland Cement", manufactured by Sumitomo Osaka Cement Co., Ltd.) is stirred rapidly at a water: cement ratio of 50% and a fine aggregate ratio of 58%, and poured into a mold.
The surface was flattened with an iron.

Immediately after that, the protective sheet from which the release paper was peeled was brought into contact with the surface of concrete, and the protective sheet was adhered to the concrete surface by pressure bonding with an iron roller for defoaming.

After 24 hours of construction, the concrete hardened, the protective sheet adhered to the concrete, and even if it was peeled off by hand, the concrete surface could not be exposed.

When a large vehicle was passed over the protective sheet, the surface of the concrete was not exposed, and it was in a state of being able to withstand sufficiently.

When the interface between the protective sheet and the concrete was observed from the cut surface, it was found that the protective sheet adhered without any gap along the unevenness of the concrete surface.

Example 2 As shown in FIG. 4, a woven aramid fiber 22 was immersed in a modified asphalt 21 (manufactured by Shizuoka Bituminous Industry Co., Ltd.),
A 100 μm-thick vinyl chloride film 23 is laminated while heating at ℃, and then release paper 3 is adhered to the protective sheet.
Created 2. The thickness of the modified asphalt layer is 1.5
mm.

The cement ("Portland Cement", manufactured by Sumitomo Osaka Cement Co., Ltd.) is mixed rapidly with a water: cement ratio of 50% and a fine aggregate ratio of 58%, and poured into a mold.
The surface was flattened with an iron.

Immediately after that, the protective sheet from which the release paper was peeled was brought into contact with the surface of concrete, and the protective sheet was bonded to the concrete surface by pressing with a defoaming iron roller.

After 24 hours of construction, the concrete hardens,
The protective sheet adhered to the concrete, and even if it was peeled off by hand, the concrete surface could not be exposed.

When a large vehicle was passed over the protective sheet, the surface of the concrete was not exposed, and it was in a state of being able to withstand sufficiently.

When the interface between the protective sheet and the concrete was observed from the cut surface, it was found that the protective sheet adhered tightly along the unevenness of the concrete surface.

Example 3 The silicone release agent 4 was applied to the inside of the mold of the common groove, and then the protective sheet used in Example 1 was attached.

Cement ("Portland Cement", manufactured by Sumitomo Osaka Cement Co., Ltd.) was stirred rapidly at a water: cement ratio of 50% and a fine aggregate ratio of 58%, and poured into a mold.
The surface was flattened with an iron.

Twenty-four hours after the application, the cured joint groove was released from the mold. The protective sheet adhered to the surface of the common groove was not peeled off even if it was peeled off by hand.

When the interface between the protective sheet and the concrete was observed from the cut surface, it was found that the protective sheet was in close contact with the irregularities on the concrete surface without any gap.

Example 4 The silicone release agent 4 was applied to the inside of the mold of the common groove, and then the protective sheet used in Example 2 was attached.

The cement ("Portland Cement", manufactured by Sumitomo Osaka Cement Co., Ltd.) is stirred rapidly with a water: cement ratio of 50% and a fine aggregate ratio of 58%, and poured into a mold.
The surface was flattened with an iron.

Twenty-four hours after the application, the cured joint groove was released. The protective sheet adhered to the joint groove surface could not be peeled off even if it was peeled off by hand.

When the interface between the protective sheet and the concrete was observed from the cut surface, it was found that the protective sheet adhered along the unevenness of the concrete surface without any gap.

[0050]

As described in detail above, the method for waterproofing a concrete surface according to the present invention requires only a protective sheet attached to the concrete surface before hardening, so that the construction period can be significantly reduced. In addition, since the modified asphalt layer of the protection sheet is softened by the reaction heat of the concrete and can be bonded by negative pressure at the time of hardening of the concrete, the protection sheet and the concrete can be firmly adhered.

Further, in the present invention, since a polymer material having a cosmetic property is used for the surface of the protective sheet, the waterproofing treatment and the cosmetic treatment can be completed simultaneously with the concrete hardening.

[Brief description of the drawings]

FIG. 1 is a schematic cross-sectional view of concrete after a protective sheet is brought into close contact with the concrete surface waterproofing method of the present invention.

FIG. 2 is a schematic sectional view of a protective sheet.

FIG. 3 is a schematic sectional view showing another example of the protective sheet.

FIG. 4 is a schematic view showing an example of an apparatus for producing a protective sheet used in the present invention.

FIG. 5 is a schematic sectional view showing a state where concrete is poured into a formwork of a concrete secondary processed product.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Concrete 2 ... Protective sheet 21 ... Modified asphalt layer 22 ... Reinforcement core material 23 ... Surface decorative layer 24 ... Hard resin layer 3 ... Release paper 4 ....・ Release agent 5 ・ ・ ・ Form 61,62,63,64,65,66,67 ・ ・ ・ Roller

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 2E001 DA01 FA30 GA24 GA25 GA27 GA28 HA01 HA04 HD11 HD13 HE01 HE03 JD05 LA04 LA05 LA16

Claims (5)

[Claims] 1. A protective sheet having at least a modified asphalt layer and a decorative surface layer is brought into contact with a concrete surface with the modified asphalt surface, and the modified asphalt layer is softened by heat of curing reaction of the concrete, whereby the protective sheet is protected. A method for waterproofing a concrete surface, wherein the sheet is adhered to the concrete surface. 2. The method for waterproofing a concrete surface according to claim 1, wherein the modified asphalt layer of the protective sheet is a modified asphalt having a softening point of 80 to 120 ° C. Construction method. 3. The method for waterproofing a concrete surface according to claim 1, wherein the surface decorative layer of the protective sheet is at least one selected from the group consisting of vulcanized butyl rubber, vinyl chloride, polyurethane, and acrylic resin. A method for waterproofing concrete surfaces, comprising a polymer material as a main component. 4. The method for waterproofing a concrete surface according to claim 1, wherein a thickness of the modified asphalt layer of the protective sheet is 0.5 to 3.0 mm. Method for waterproofing concrete surfaces. 5. The method for waterproofing a concrete surface according to claim 1, wherein a thickness of a surface decorative layer of the protective sheet is 20 μm to 1.5 mm. Waterproof construction method.