JPH0868024A - Method of retaining draining and permeability functions of paved material - Google Patents

Abstract

PURPOSE: To prevent pores of paving bodies from being clogged with duct, by sprinkling a surfactant aqueous solution having a specified surface tension and concentration and retaining the draining and permeable functions of the paving bodies with a specified porosity. CONSTITUTION: A surfactant aqueous solution having 50dyne/cm or less surface tension is splinkled in order to retain the draining and permeable functions of paving bodies having 10-26vol.% porosity. In this case, anion, nonion, cation, or amphoteric surfactant is selectively used. At that time, the concentration of surfactant in the aqueous solution is prepared 0.005-10wt.% and it is possible to use a water-repellent or oil-repellent processing agent or a hydrophilicity processing agent in common.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD 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, in which voids are clogged with "dust" or "dust". The present invention relates to a method for retaining the function of a pavement for preventing the above-mentioned problems.

[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.

The causative substances are mainly "dust" and "dust".
Therefore, as a method for recovering the function of drainage pavement, it has been proposed to remove the causative substance that causes clogging (“Study on function recovery method for drainage pavement”, road construction,
No.549, P.56-65). However, it is considered more effective to prevent "clogging" than to recover the function after "clogging" has occurred.

[0006]

Means for Solving the Problems As a result of diligent efforts for a method of more efficiently maintaining the drainage function, the present inventors have found that it is excellent by spraying an aqueous surfactant solution having a surface tension of 50 dyne / cm or less. The present invention has been completed by finding the retention of the function.

That is, according to the present invention, in order to maintain the drainage property or the water permeability function 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 is sprayed. The present invention relates to a characteristic pavement function retaining method.

[0008] Specifically, by spraying an aqueous surfactant solution having a surface tension of 50 dyne / cm or less on a pavement having a porosity of 10 to 26% by volume, it is possible to prevent "dust" from adhering to the pavement. It can be prevented.

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 ethylene oxide and propylene oxide adducts thereof are also included.

The nonionic surfactants include higher alcohol ethylene oxide adducts, alkylphenol ethylene oxide adducts, fatty acid ethylene oxide adducts, polyhydric alcohol fatty acid ester ethylene oxide adducts, higher alkylamine ethylene oxide adducts, fatty acid amides. 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 include adducts of ethylene oxide and propylene oxide.

Examples of the amphoteric surfactants 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 kind or two or more kinds 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 type surface tensiometer.

Among the surfactants, anionic and nonionic surfactants have excellent penetrability and detergency and are economically advantageous. As the spraying amount, the concentration of the surfactant was 0.0
It should be sprayed to the extent that the pavement is uniformly wet in the range of about 05 to 10% by weight.

Although the compounded surfactant itself has a great effect of preventing clogging, a water- and oil-repellent finishing agent such as a fluorine-based polymer, a water-repellent finishing agent such as a silicon-based polymer and a polyethylene oxide group are further added. You may use together the hydrophilic polymer to contain and the hydrophilic processing agent, such as a cellulosic compound.

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.

[0019]

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 retaining the water permeation function, 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.

[0021]

[Table 1]

[Water Permeability Test Method] A paving 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.

[Evaluation Method for Clogging of Drainage Pavement Asphalt Mixture] Immersion in Mud (50% by weight) was submerged in water for 24 hours (after 24 hours, submerged below the supernatant of the muddy water). Gently pull up and dry at room temperature for 24 hours.

Water Permeability Test Procedure 1. Measure the water permeability of the asphalt mixture for drainage pavement before mud water infiltration (referred to as water permeability (A)). 2. The drainage asphalt mixture for paving was sprayed with 10 cc of the aqueous surfactant solution shown in Table 2 uniformly by spraying on the upper surface of the mixture. 3. Measure the hydraulic conductivity of the asphalt mixture for drainage paving after flooding with muddy water (referred to as hydraulic conductivity (B)). 4. The difference in hydraulic conductivity (| log (A) -log (B) |) was calculated, and the following evaluations were performed. ○: | log (A) −log (B) | ≦ 0.5: Almost no decline in water permeability function △: 0.5 <| log (A) −log (B) | ≦ 1.0: slight decline in function X: 1.0 <| log (A) -log (B) |: Significant functional deterioration is observed.

The measurement results are shown in Table 2.

[0026]

[Table 2]

[0027]

EFFECTS OF THE INVENTION According to the present invention, when maintaining the drainage or water permeability of a pavement having a porosity of 10 to 26% by volume, by spraying an aqueous surfactant solution having a surface tension of 50 dyne / cm or less, It can be expected that the retention of water permeability will be improved.

Claims (3)

[Claims] 1. A surface tension of 50 dyne in order to maintain the drainage or water permeability of a pavement having a porosity of 10 to 26% by volume.
A method for retaining the function of a pavement, which comprises spraying an aqueous surfactant solution having a density of not more than / cm. 2. The surfactant is an anionic type, a nonionic type,
The method for maintaining the function of a pavement according to claim 1, wherein the surfactant is one or more surfactants selected from cationic and amphoteric surfactants. 3. The method for maintaining the function of 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.