JPH0868023A - Cleaning method for recovering function of pavement having drainage or water permeability - Google Patents

Abstract

(57) [Summary] [Purpose] Removing "dust" and "dust" from the voids of pavement called drainage pavement or water-permeable pavement.
When cleaning with hydrogen peroxide solution for the purpose of recovering the original function, cleaning is performed more efficiently. [Composition] A surfactant aqueous solution having a surface tension of 50 dyne / cm or less when washed with hydrogen peroxide water for the purpose of recovering the drainage or water permeability of a pavement having a porosity of 10 to 26% by volume. A method for cleaning a pavement, characterized by using. [Effect] The recovery rate of the water permeation function will increase, and efficiency can be expected.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a pavement having a porosity of 10 to 26% by volume, that is, a so-called drainage pavement or a water-permeable pavement.
The present invention relates to a method for cleaning a pavement for the purpose of more efficient cleaning when cleaning with hydrogen peroxide solution for the purpose of recovering the original function and recovering the original function.

[0002]

BACKGROUND OF THE INVENTION Drainage pavement or permeable pavement is a pavement construction method in which an asphalt mixture with large voids is used in the surface layer of the pavement, and rainwater staying on the surface is stored and flows down into the pavement. Is.

As a function of drainage pavement, prevention of hydroplaning phenomenon in rainy weather, smoking light reflection,
It is directly linked to traffic safety, environmental measures, and improvement of service level, such as reduction of water splash and rolling noise due to tire running, and there are great expectations for development and introduction.

[0006] However, the drainage or water permeability function has been cited as a problem that "clogging" occurs and the original function is lost during long-term use.

A method of recovering the function is to remove the causative substance that causes clogging, and the causative substance is mainly "dust" and "dust".

As a method for recovering the function of drainage pavement, the following method is considered to be possible.

Cleaning of clogging with high-pressure water Removal of clogging with compressed air Vacuuming of clogging with clogging Removal of clogging with vibration Cleaning of clogging with hydrogen peroxide solution.

The method (1) is considered to be an excellent method because it has a high recovery ability and can increase the working speed, but it is effective in taking measures such as complete removal of clogging and prevention of redeposition. A cleaning method is required. Further, there is a drawback that the system becomes large in size because high pressure water is generated.

The methods (1) to (3) are not practical because they do not have a high recovery ability and cannot expect a high working speed.

The method of (1) utilizes the fact that various substances such as dust, fine powder, solids having a rough surface, and alkalis are easily decomposed by hydrogen peroxide water as a catalyst to release oxygen and foam. It is a method to remove the "dust" and "dust" stuck in the drainage pavement together with bubbles to the outside of the system, which has the merit that the recovery ability can be expected and the system is simple.

[0011]

The inventors of the present invention have made diligent efforts for a more efficient cleaning method for cleaning clogging with a hydrogen peroxide solution, and as a result, have a surface tension of 50 dyne.
The inventors have found that the use of a surfactant aqueous solution having a density of less than 1 cm 3 / cm 3 provides excellent cleaning properties and prevents the removal and reattachment of clogging substances, and has completed the present invention.

That is, the present invention has a surface tension of 50 dyne / cm when washing with hydrogen peroxide solution for the purpose of recovering the drainage or water permeability of a pavement having a porosity of 10 to 26% by volume. The following method for cleaning a pavement is characterized by using an aqueous surfactant solution.

Specifically, according to the present invention, when a clogged pavement is directly sprayed with, for example, a hydrogen peroxide solution diluted to a concentration of 10% to remove the clogged material, the surface tension is 50%.
By using an aqueous surfactant solution of dyne / cm or less, it is possible to penetrate into the details of the aqueous solution, that is, the aqueous solution enters between the pavement and the clogging material to weaken the adhesion force of the clogging material. It can be easily peeled off, and the clogging material can be prevented from being emulsified and dispersed in the aqueous solution by the action of emulsifying and dispersing and again adhering to the pavement.

In the cleaning of the clogging with the hydrogen peroxide solution, there is no problem even if another cleaning method is used in combination as a more efficient cleaning method. For example, there is no problem even if the hydrogen peroxide solution and vibration are simultaneously applied. Further, if cleaning is performed with vacuum after cleaning with hydrogen peroxide solution, the efficiency is further improved.

As the surfactant used in the present invention, anionic, nonionic, cationic and amphoteric surfactants can all be used.

Examples of the anionic surfactant include carboxylic acid salts, sulfuric acid ester salts, sulfonic acid salts, and phosphoric acid ester salts, and their ethylene oxide and propylene oxide adducts are also included.

As the nonionic surfactant, higher alcohol ethylene oxide adduct, alkylphenol ethylene oxide adduct, fatty acid ethylene oxide adduct, polyhydric alcohol fatty acid ester ethylene oxide adduct, higher alkylamine ethylene oxide adduct, fatty acid amide. Polyethylene glycol type surfactants such as ethylene oxide adducts, ethylene oxide adducts of fats and oils, polypropylene glycol ethylene oxide adducts, etc., fatty acid esters of glycerol, fatty acid esters of pentaerythritol, fatty acid esters of sorbitol and sorbitan, fatty acids of sucrose Examples include polyhydric alcohol type surfactants such as esters, alkyl ethers of polyhydric alcohols, and fatty acid amides of alkanolamines.

Examples of the cationic surfactants include alkylamine salts, alkanolamines, quaternary ammonium salts, amine oxides and polyethylene polyamines, and also adducts of ethylene oxide and propylene oxide.

Examples of the amphoteric surfactant include amino acid type and betaine type carboxylic acid salts, sulfuric acid ester salts, sulfonic acid salts, and phosphoric acid ester salts.

It is possible to use one type or two or more types of the above-mentioned various surfactants singly or in combination.

The surface tension of the aqueous solution in which the surfactant is dissolved can be determined by a Wilhelmy surface tensiometer.

Among the surfactants, the anionic and nonionic surfactants have excellent penetrability and detergency and are economically advantageous. The amount used is in the range of about 0.005 to 10% by weight in the aqueous solution, but it is preferably used at a micelle limit concentration (cmc) or more, and optimally 0.02 to 5.0% by weight.

Although the blended surfactant has a great effect on washing sufficiently as it is, further, it is an inorganic builder such as sodium carbonate, sodium tripolyphosphate, potassium pyrophosphate, sodium silicate, sodium sulfate, zeolite or carboxymethyl cellulose. And methyl cellulose, sodium polyacrylate, polyacrylamide, polyvinyl alcohol, polyethylene oxide,
An organic builder such as polyethyleneimine may be used together.

Further, an organic chelating agent such as sodium aminocarboxylate, sodium phosphonate, sodium polycarboxylate, etc., which contributes to the trapping of the mineral substances in the aqueous solution, which is considered to lower the function of the surfactant, may be used in combination. .

Further, in order to improve the compatibility of the surfactant with water, the foam-controlling property, the wet adsorption property, the cleaning property, etc., methyl alcohol, ethyl alcohol and ethylene glycol,
You may mix-use polyhydric alcohols, such as propylene glycol.

Further, an alkaline agent such as NaOH or Na ₂ CO ₃ may be added to accelerate the decomposition and foaming of the hydrogen peroxide solution.

The kind and concentration of these are not particularly limited, and the surface tension of the aqueous solution may be 50 dyne / cm or less.

[0028]

EXAMPLES The present invention will be specifically described below, but the present invention is not limited to these examples.

[Preparation of Drainage Pavement Asphalt Mixture] In order to clarify the effect of water permeability recovery, a drainage pavement asphalt mixture prepared by a Marshall test compaction device was used in a simulated manner. The asphalt mixture for drainage pavement was manufactured by using a Marshall test compaction device, and three pieces were prepared for each test by compacting 50 times on both sides, and the data was an average value of three measurements. The asphalt mixture for drainage pavement is shown in the asphalt pavement summary (published by Japan Road Association), and the materials shown in Table 1 were used.

[0030]

[Table 1]

[Preparation of Clogged Drainage Pavement Asphalt Mixture] The drainage pavement asphalt mixture prepared by the Marshall test compaction device is clogged with artificial clay / clay Let

[Water permeability test method] The pavement test method handbook (published by Japan Road Association) was used to measure the water permeability coefficient according to the water permeability test method of the water permeable asphalt mixture.

[Cleaning Procedure and Water Permeability Test Procedure] 1. Measure the water permeability of the asphalt mixture for drainage pavement before clogging (referred to as water permeability (A)). 2. Prepare a clogged drainage pavement asphalt mixture and measure the hydraulic conductivity (referred to as hydraulic conductivity (B)). 3. To the clogged drainage pavement asphalt mixture, 10% hydrogen peroxide of the aqueous surfactant solution shown in Table 2 was sprayed evenly and directly on the 10 cc mixture surface for cleaning. Subsequently, after 10 minutes, the nozzle of a dry / wet vacuum cleaner (CV-97 WD manufactured by Hitachi) was brought into close contact with the surface of the mixture directly to perform cleaning by suction for 1 minute. 4. Measure the hydraulic conductivity of the asphalt mixture for drainage pavement after washing (referred to as hydraulic conductivity (C)). 5. Calculate the recovery rate (%) of the permeability function. The recovery rate (%) was calculated according to the following formula.

[0034]

[Equation 1]

The measurement results are shown in Table 2.

[0036]

[Table 2]

(Note) * 1; High Metroses SM 8000 (manufactured by Shin-Etsu Chemical Co., Ltd.) * 2; PVA-117 (manufactured by Kuraray Co., Ltd.) * 3; Hibiswako 105 (manufactured by Wako Pure Chemical Industries, Ltd.) * 4; Seresh 100 (Kao Corporation) (Made)

[0038]

According to the present invention, when recovering the drainage property or water permeability of a pavement having a porosity of 10 to 26% by volume, an aqueous surfactant solution having a surface tension of 50 dyne / cm or less in washing with hydrogen peroxide solution. By using, the recovery rate of the water permeation function increases, and efficiency can be expected.

Claims (10)

[Claims] 1. A surface active agent having a surface tension of 50 dyne / cm or less when washed with a hydrogen peroxide solution for the purpose of recovering drainage or water permeability of a pavement having a porosity of 10 to 26% by volume. A method for cleaning a pavement, which comprises using an aqueous solution of a chemical. 2. The surfactant is an anionic type, a nonionic type,
The method for cleaning a pavement according to claim 1, wherein the pavement is one or more surfactants selected from cationic and amphoteric surfactants. 3. The method of cleaning a pavement according to claim 1, wherein the concentration of the surfactant in the aqueous surfactant solution is in the range of 0.005 to 10% by weight. 4. The method for cleaning a pavement according to claim 1, wherein the aqueous surfactant solution further contains a builder. 5. The method for cleaning pavement according to claim 4, wherein the builder is tripolyphosphate ester or zeolite. 6. The method for cleaning a pavement according to claim 4, wherein the builder is methyl cellulose, polyvinyl alcohol or polyacrylamide. 7. The method for cleaning a pavement according to claim 1, wherein the aqueous surfactant solution further contains alcohols. 8. The method for cleaning a pavement according to claim 7, wherein the alcohol is methyl alcohol or polyethylene glycol. 9. The surfactant aqueous solution further contains an organic chelating agent, according to any one of claims 1 to 8.
The method for cleaning a pavement according to the item. 10. The method for cleaning a pavement according to claim 9, wherein the organic chelating agent is sodium polycarboxylate.