JP2002363911A - Method for surface-treating water permeable road - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve such problems with a permeable space coating method that the penetration of water may be still short, namely, refuse or dirt tends to be plugged since the space is small to obstruct the passing of water, and there is also a request for minimizing poisonous substances not completely oxidized (for example, nitrogen monoxide, sulfur dioxide, hydrogen sulfide) contained in the air. SOLUTION: Resin mortar is fillingly applied into the aggregate clearances in the paved surface of a water permeable road, and then photocatalyst is adhered to the applied surface. The resin mortar is the mixture of resin and fine aggregate, and has a water permeability.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for treating a surface of a water-permeable road.

[0002]

2. Description of the Related Art Conventionally, roads have been paved with asphalt. In this method, a mixture of asphalt and aggregate (pebble) is laid on the surface of a road. Since the asphalt component itself does not transmit water, the entire pavement surface did not transmit water, and thus either remained on the surface or flowed into the side gutter. However, if rainwater accumulates on the road surface, it forms a film, which is very dangerous because it leads to an automobile slip accident. In addition, since there was no permeation of water downward and the water flowed downstream from the gutter, groundwater was reduced and land subsidence occurred. In addition, the decrease in groundwater is also affecting surrounding plants.

Therefore, so-called water-permeable asphalt has been recommended so that the pavement surface has water permeability (water permeability), absorbs rainwater, and does not form a film on the surface. In this method, the asphalt component is reduced, the aggregates are point-bonded to each other, a gap is provided, and water is transmitted between the gaps. However, in this method, since the aggregate itself is bonded and fixed only at points, the aggregate is separated on heavy roads or the like and is scattered by tires or the like, and as a result, the portion often becomes a concave portion. Further, once the concave portion is formed, the scattering of the edge portion is further accelerated. Therefore, the road must be repaired frequently (every year or about once every two years). Not only causes traffic congestion due to traffic interruption, etc., but also costs are considerable.

[0004] Furthermore, since the gap between the aggregates of the water-permeable asphalt is large, there is a problem that dust and the like are clogged there, and the water permeability is lost. For this reason, dust is regularly removed by suction using a vacuum car or the like, but this is also a very laborious and costly operation. Also, this does not completely return,
There is no change in gradually clogging.

[0005] In order to solve such a drawback, the present applicant has devised a method of applying a permeable filler itself to the gap between the aggregates on the surface of the water-permeable asphalt pavement, and has disclosed a patent. We have also filed applications. With this method, the various disadvantages described above were largely eliminated. That is, the resin is filled to prevent the aggregate from scattering, and the gap between the aggregates is almost eliminated, so that there is almost no clogging of dust. In addition, since the filler itself is water-permeable, it does not hinder water permeability.

[0006]

However, even with such a gap coating method, water permeability may still be insufficient. That is, since the gap is small, dust and dirt are likely to be clogged up a little, which tends to hinder the passage of water. Also,
There is also a demand to reduce as much as possible toxic non-peroxidized substances (eg, nitric oxide, sulfur dioxide, hydrogen sulfide) present in the air.

[0007]

In view of the above situation,
The present inventor has completed the treatment method of the present invention as a result of earnest research, and the feature of the method is to fill and coat resin mortar in aggregate gaps on the pavement surface of a water-permeable road, and then apply a photocatalyst. A method of attaching to a coating surface, wherein the resin mortar is a mixture of a resin and fine aggregate and is itself having water permeability, and in another aspect,
A method of filling and coating a resin mortar in an aggregate gap on a pavement surface of a water-permeable road, wherein the resin mortar is a mixture of a resin and a fine aggregate, which itself has water permeability. The point is that the photocatalyst is also adhered or mixed therewith.

[0008] Here, the pavement surface of a water-permeable road means the surface of a generally-known water-permeable asphalt or water-permeable concrete pavement. The aggregate gap has a gap through which water always passes at least in a water-permeable pavement material. It refers to the void. In addition, the filling coating is to fill at least the voids with a pavement material, and may be further laminated after the filling.

A photocatalyst is one that is excited by light to generate nascent oxygen and exhibits strong oxidizing power. At present, titanium oxide powder is known as the most effective one, but is not limited thereto. Generally, the smaller the titanium oxide powder, the greater the effect. In the present invention, 0.1 μ to several tens μ are preferable.

The fine aggregate may be not only small stones, sand, gravel and the like, but also inorganic particulates such as crushed ceramics. The size is preferably about 0.1 to 2.0 mm.
If it is finer than this, the water permeability decreases, and if it is larger than this, it becomes difficult to fill the voids between the aggregates of the water-permeable asphalt. Of course, aggregates of a single particle size may be used, but usually a mixture having a certain range of particle size distribution. Most (over 90%) are of this size.

The resin is not particularly limited, but epoxy resin, urethane resin, acrylic resin, polyester resin and the like are preferable. It may be a thermosetting resin or a thermoplastic resin. That is, it may be a commonly used spray material for wall surfaces or a resin used for surface treatment of roads.

The resin mortar is a mixture of the above-mentioned aggregate and resin, and the mixing ratio is to be determined according to the size of the aggregate and the type of resin, and is not particularly limited. However, there is no doubt that consideration should be given to ensuring a certain degree of water permeability, filling the gaps between the stones on the surface of the asphalt layer, and improving workability. Although this ratio varies depending on the size of the aggregate, for example, the particle size is 0.2 to 0.2 as the aggregate.
When a pebble of about 1.2 mm is used, the mixing ratio of the aggregate and the resin is preferably about 100: 10 to 40 by weight.
In addition, it goes without saying that the resin mortar may be mixed with a material that is usually mixed other than the resin and the aggregate. For example, pigments, weathering agents, surfactants and the like.

The construction surface of the resin mortar using a small particle aggregate and using a resin as a binder provides a photocatalyst-adhered surface which is excellent in strength, surface area and non-softening property. Since the surface has a porous structure, it is three-dimensional and therefore has a large surface area. The angle of the surface with respect to sunlight is various, and it can respond to the ever-changing angle of light. In the present invention, the attachment of the photocatalyst particles to the road surface is not performed in a factory. It is usually carried out simultaneously with the pavement of the road at the site, but it can also be applied to the existing drainage pavement. The porous structure of the road surface is useful for effectively bringing harmful components from the atmosphere containing polluting components into contact with the photocatalyst. When the air flows into the porous structure, moves for a while and then returns to the atmosphere, it is purified or easily purified by the photocatalyst and sunlight.

The method for attaching the photocatalyst to the coated surface of the resin mortar may be any method. Spraying or roller coating is most simple when the resin mortar is uncured, but it may be mixed with the resin and applied or sprayed. As the resin at this time, a resin having excellent oxidation resistance is preferable, and for example, a silicon-based resin is preferable. Further, the photocatalyst may be used as it is as particles, or may be supported on other particles and used as catalyst particles. Catalyst particles supporting a photocatalyst are inorganic particles (carrier) such as carbon, silica, and alumina
On which a photocatalyst powder is carried or fixed by a process such as baking. The size of the carrier at this time may be several μ to several mm. Further, it may be carried in advance on the aggregate of the resin mortar to be filled and coated as described above.

In the above description, the photocatalyst is attached after coating the resin mortar, but the photocatalyst or catalyst particles may be mixed with the resin mortar. This is convenient because only one process is required. However, in this case, the efficiency is degraded because the particles are distributed over the entire layer and are few exposed on the surface or existing near the surface.

When used in a mixture with a resin mortar, the resin may be deteriorated by the oxidizing action of the photocatalyst. Therefore, it is preferable to use a resin having a strong oxidizing action (for example, a silicon-based resin is preferable).

An object of the present invention is to provide a photocatalyst effect when rainwater, dust and the like pass through a gap between aggregates.
Dust and the like are oxidatively decomposed and hydrophilized to facilitate the outflow with water, and clogging is reduced by similarly treating organic substances dissolved or dispersed in water. Furthermore,
It also has the effect of oxidizing carbon monoxide, nitric oxide, and sulfur dioxide in the air to reduce toxicity and increase solubility in water, thereby preventing air pollution.

[0018]

Next, an example of the processing method of the present invention will be described. First,
A resin mortar was filled and coated on the surface of the water-permeable asphalt pavement. That is, a depth of 15 mm
Filled with. The resin mortar at this time was an aggregate (ceramic yellow crushed stone: particle size of 0.1 to 1.0 mm) 100.0 parts by weight resin (main component: bisphenol type epoxy resin) 10.0% (hardening agent: modified polyamine) 5.0%.

Next, before the resin mortar was completely cured, the catalyst particles were sprayed and attached to the surface of the resin mortar. The catalyst particles are obtained by supporting fine powder of titanium oxide on carbon particles. The size is about 0.01-1
mm. In addition, titanium oxide powder is 1 to 30 μm
Met.

After the resin mortar was solidified, a water permeability experiment was conducted, but no problem was found. In addition, an experiment of dirt (contamination degree) was also performed, but it was found that it was difficult to express numerically, but it was difficult to adhere and flow easily. In this example, since the titanium oxide is exposed on the surface, it is considered that the photocatalytic effect of the titanium oxide is retained as it is and is effectively exerted.

FIG. 1 is a process diagram for implementing the above method, in which a resin mortar 2 is being applied to an asphalt pavement surface 1. By the smoothing tool 3 (iron etc.)
The gap 5 of the aggregate 4 is filled with the resin mortar 2 and the surface is uniformly applied. FIG. 2 shows where the application has been completed. From the level of the asphalt surface, it can be seen that it hardly comes out above. The construction is now complete.

FIG. 3 is an enlarged sectional view of this surface portion.
There is an asphalt emulsion around the aggregate 4, and a resin mortar is filled and coated in gaps between the asphalts. Although the gap is filled, there is no problem because the resin mortar itself has water permeability. FIG. 4 is an enlarged view of the resin mortar 2 of FIG. It can be seen that the catalyst particles 6 adhere to the periphery of the resin mortar 2 (resin coated with resin). FIG. 5 is a further enlarged view thereof. The surface of the catalyst particles 6 is covered with the titanium oxide powder 7. In this example, it is fixed by baking.

[0023]

According to the method of the present invention, there are the following advantages. (1) Since the pavement material made of fine-grained aggregate and resin is densely filled and reinforced in the gaps between the aggregates on the asphalt surface, there is no dispersion or scattering of the aggregates. As a result, the pavement surface lasts longer and the frequency of repair work is significantly reduced. (2) Since the water permeability is not impaired, a slip accident or the like can be prevented. Also, there is no problem of groundwater reduction. (3) Since there is almost no gap between asphalt aggregates, there is very little dust accumulation and cleaning is easy. (4) Since a photocatalyst is contained, contaminants are oxidatively decomposed and clogging is more difficult to occur. (5) The surface of the resin mortar to which the photocatalyst adheres has a large surface area, is tough, and has a porous structure, so that an effective oxidation reaction occurs, which is useful for purification of air pollution. (6) Since the photocatalyst powder is supported on a carrier, very fine powder can be used. Therefore, the photocatalytic effect is high.

[Brief description of the drawings]

FIG. 1 is a process sectional view showing an example of the method of the present invention.

FIG. 2 is a cross-sectional view showing an example processed by the method of the present invention.

FIG. 3 is a partially enlarged sectional view of FIG. 2;

FIG. 4 is a partially enlarged sectional view of FIG. 3;

FIG. 5 is a partially enlarged sectional view of FIG. 4;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Asphalt surface 2 Resin mortar 3 Coating tool 4 Asphalt aggregate 5 Void 6 Catalyst particles 7 Titanium oxide powder

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Kiyoken Ishii 1-8-1, Mihama, Urayasu-shi, Chiba Prefecture Toray Le Toiletio Call Co., Ltd. (72) Inventor Tadami Kamaishi 1-1-1, Oe, Otsu-shi, Shiga Prefecture No. 1 Toray Industries, Inc. Seta Plant (72) Inventor Hideharu Nagata 9-17, Higashitakatsu-cho, Tennoji-ku, Osaka-shi F-term in Osada Giken Co., Ltd. 2D051 AA02 AF01 AF03 AF02

Claims (4)

[Claims] 1. A method of filling and coating a resin mortar in a gap between aggregates on a pavement surface of a water-permeable road, and then attaching a photocatalyst to the coated surface, wherein the resin mortar is a mixture of resin and fine aggregate. A method for treating a surface of a water-permeable road, characterized in that the surface is water-permeable. 2. The surface treatment method for a water-permeable road according to claim 1, wherein the photocatalyst is mixed with a resin and adhered to a coated surface. 3. A method of filling and coating a resin mortar in a gap between aggregates on a pavement surface of a water-permeable road, wherein the resin mortar is a mixture of a resin and a fine aggregate and is itself water-permeable. And a photocatalyst mixed therewith. A method for treating a surface of a water-permeable road, comprising: 4. The surface treatment method for a water-permeable road according to claim 1, wherein the photocatalyst is used as catalyst particles carrying the photocatalyst.