JPH05287872A - Waterproof method for fairfaced concrete - Google Patents

Abstract

PURPOSE:To prevent breakage of a coating film without damaging the appearance by ironing a filling material made by adding synthetic resin to a transparent aggregate such as glass beads or the like on the surface of fairfaced concrete to fill up a pin hole. CONSTITUTION:Glass beads or powder/particle of transparent synthetic resin are used as an aggregate, and synthetic resin emulsion or solvent cutback type synthetic resin which is transparent and has adhesive force is added thereto is mixed therein as a binding material so as to prepare a filling material having a moderate viscosity. The filling material is ironed on the surface of fairfaced concrete to fill up a pinhole so that the concrete is finished smooth. As finishing, acryl silicone resin or fluororesin having strong anti-weather property is applied on the concrete to form a coating film on the surface thereof. Thus, it is possible to prevent breakage of a coating film due to air expansion in a pinhole and water invasion caused by the breakage.

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 exposed concrete, particularly concrete in which the outer wall of a building is exposed.

[0002]

2. Description of the Related Art The outer wall of a reinforced concrete building is finished by removing the formwork and then pasting tiles on the surface or applying a paint to finish it. There is a finishing method that leaves a heavy atmosphere of the frame pattern and material as a design.
Recently, exposed concrete finishes have been favored because they have better natural properties than surface finishes using different building materials as in the former case.

However, the exposed concrete has pinholes, and if the pinholes are left as they are, there is a risk that water will be flooded. For this reason, conventionally, a waterproof method called clear in the industry is used in which a water repellent agent such as a silicone agent is applied after embedding with cement mortar or a transparent waterproof agent is applied.

The silicone water repellent penetrates into the block and repels water. Clear forms a kind of paint film on the surface of concrete to prevent water from entering. However, the former has poor durability and loses its effect in 1 to 2 years, and the latter loses its effect due to damage of the coating film caused by environmental action. In addition to these two methods, there are waterproofing methods, but they cannot be used for exposed concrete where the bare skin of the surface is left as it is because the surface is hidden by painting.

Therefore, at present, a method of filling the pinhole with cement mortar is used. In addition, there is a method of using both coating and clearing of the silicon agent while leaving the pinhole as it is to impair the designability of the shot, but when the pinhole is left waterproof for treatment, it is blown with wind. When it rains, rainwater permeates the concrete from the pinhole due to water pressure.

When the coating film is waterproof without filling the pinholes, when the summer air temperature rises, the air in the pinholes expands, and the pressure causes the coating film to break, creating a cause of flooding.
In order to prevent this, conventionally, mortar is applied like a squeeze to fill the pinholes. However, if the cement is filled with mortar mixed with sand or aggregate, a kind of pattern generated on the surface due to pinholes disappears, and the design of bare bare bare skin is lost. in this way,
The current situation is that waterproofness cannot be sufficiently achieved without impairing the designability that shows the bare surface.

[0007]

SUMMARY OF THE INVENTION In order to solve the above problems, it is an object of the present invention to provide a method capable of reliably waterproofing exposed concrete while making the best use of pinholes on the surface.

In order to achieve this object, the present invention is constructed as follows. That is, glass beads or transparent synthetic resin powder or granules are used as an aggregate, and a mixture of a synthetic resin emulsion or a solvent-diluted synthetic resin, which is transparent and has adhesive strength, is added to this as a binder. A waterproofing method for exposed concrete, which comprises filling the surface of the pinhole of the exposed concrete with a filler having an appropriate viscosity to fill the pinhole.

[0009]

[Function] Glass beads or transparent synthetic resin powder
At the same time as filling the pinholes with the granules, the aggregates such as glass beads are adhesively fixed in the pinholes by the synthetic resin emulsion or solvent-diluted synthetic resin, so that the air does not exist in the pinholes. .. Therefore, there is no risk of the coating film breaking and submersion due to the expansion of air in the pinhole.

[0010]

EXAMPLES Examples of the present invention will be described below. First, apply a water repellent such as silicone agent to the surface of concrete,
Apply water repellent treatment. This is the same as the conventional method. Next, a transparent synthetic resin emulsion or a solvent-diluted synthetic resin is used as a binder, and a large number of glass beads or transparent synthetic resin powders and granules are mixed as an aggregate to form a filler. A synthetic resin emulsion has a concentration of 10 as an example.
Acrylic resin is used up to 60%, but it is not limited to acrylic resin as long as it is a transparent and adhesive synthetic resin.

As the glass beads, used is a mixture of Toshiba B (# 36) and Toshiba AD (# 80), which are commercially available as industrial glass, in 1/2% by weight. These are transparent glass grains sold by Toshiba Ballotini Co., Ltd. for blasting. B (# 36) has a particle size of 590-420 microns, AD (# 80) has a particle size of 2
10 to 105 microns. The particle size is selected according to the diameter of the pinhole. An acrylic resin emulsion is added to the glass beads, and a material having a viscosity suitable for ironing is added and mixed. As the transparent synthetic resin powder / granular material, for example, a transparent acrylic resin plate is crushed into a powder / granular material.

The above-mentioned filler is ironed and painted on the surface of the exposed concrete with a trowel or spatula to fill the pinholes and finish it smooth. As the iron, a plastering iron having a rubber-like body on the surface is preferable.

Finally, as a finish, an acrylic silicone resin or a fluorine resin having strong weather resistance or another resin for forming a clear coating film is applied to form a coating film on the surface.
This finishing is the same as the conventional method.

Since the present invention is constructed as described above,
It has the following effects. (1) Since a pinhole is filled with a synthetic resin emulsion or a solvent-diluted synthetic resin and a filler such as glass beads, the coating film on the surface may be broken due to air expansion in the pinhole, so that water may be infiltrated. Absent. (2) Since the filler materials are all transparent, pinholes remain intact even if the holes are filled, and there is no risk of spoiling the natural appearance of the concrete without losing the design of the bare concrete. ..

Claims (1)

[Claims] 1. A mixture of glass beads or transparent synthetic resin powder or granules as an aggregate, to which a transparent synthetic resin emulsion having adhesive strength or a solvent-diluted synthetic resin is added as a binder. Then, a method for waterproofing exposed concrete is characterized in that the surface of the exposed concrete is ironed with a filler having an appropriate viscosity to fill the pinholes.