JP2007231565A - Permeable weedproof pavement method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a permeable weedproof pavement method with water permeability, which suppresses the germination of plants. <P>SOLUTION: The permeable weedproof pavement method comprises: a step of mixing porous coal ash, produced from a boiler of a thermal power plant, a cement-based solidification material, and a mixed liquid at a predetermined weight ratio; and a step of forming a pavement layer 1 by rolling a mixture M on a base course 3. The pavement layer 1, which is composed of the mixture M consisting of the coal ash, the cement-based solidification material and the mixed material, has characteristically water permeability, and surface strength for suppressing the germination of the plants. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a water-permeable grassproof pavement method.

In recent years, depletion of global resources has been regarded as important, and recycling of industrial waste for the purpose of effective use of resources has become an important issue. As one of such industrial waste recyclings, a proposal has been made to use the coal ash as a pavement layer on the ground for the burned coal ash generated in large quantities from a boiler of a thermal power plant (Patent Document 1).
JP-A-6-107445 (Abstract)

  It is important that the pavement layer suppresses the germination of plants so that weeds do not grow thickly. At the same time, it is important to have water permeability and good drainage.

  Accordingly, an object of the present invention is to provide a water-permeable grassproof pavement method that has water permeability and can suppress germination of plants.

  In order to achieve the above object, the water-permeable grass paving method of the present invention is a step of mixing porous coal ash generated from a boiler of a thermal power plant, a cement-based solidified material, and an admixture at a predetermined weight ratio. And a step of rolling the mixture onto a roadbed to form a pavement layer, wherein the pavement layer has water permeability and has a surface strength that suppresses germination of plants.

ADVANTAGE OF THE INVENTION According to this invention, the coal ash as a waste can be effectively utilized by utilizing for the pavement layer the coal ash generated from the boiler of a thermal power plant.
Moreover, the pavement layer which has water permeability and suppresses germination of a plant can be formed by rolling the mixture comprised with the said coal ash, the cement-type solidification material, and a liquid mixture on a roadbed.

  The “cement-based solidifying material” refers to a powder that hardens as time passes when kneaded with an admixture such as water. As the “cement-based solidifying material”, for example, gypsum, magnesia cement, hydraulic lime, natural cement, Portland cement, alumina cement, blast furnace cement, rigidite and the like can be used.

In the present invention, the surface strength is preferably ² Nf / mm ² or more. By controlling the surface strength to ² Nf / mm ² or more, the suppression of plant germination can be further enhanced.

  In the present invention, the water permeability is preferably 30 ml / second or more based on a field test method for water-permeable asphalt pavement determined by the Japan Road Association.

In the present invention, the coal ash is composed of clinker ash.
The clinker ash refers to ash that has been dewatered and crushed by collecting coal ash lump that has fallen to the bottom of the boiler among coal ash generated when coal is burned in a thermal power plant. As the coal ash, it is preferable to use a powder obtained by pulverizing the clinker ash to a particle size of about 0.15 mm to 7.0 mm.

  In the present invention, it is preferable that 3 parts by weight or more of coal ash is mixed with 1 part by weight of the cement-based solidified material.

  In the present invention, the paving layer preferably has a thickness of 30 mm or more. The thickness of the pavement layer is preferably set to about 30 mm to 70 mm, and more preferably about 50 mm.

Hereinafter, a water-permeable grass protection pavement method according to an embodiment of the present invention will be described with reference to the drawings.
As shown in FIG. 1, the ground paved by the water-permeable grassproof paving method has a crushed stone 2 or the like laid on a roadbed 3, and a pavement layer 1 is formed thereon.
The thickness 1D of the pavement layer 1 is set to about 50 mm, and the thickness 2D of the crushed stone 2 is set to about 100 mm.

Next, a pavement method for the water-permeable grass-proof pavement will be described.
First, coal ash composed of porous clinker ash generated from a boiler of a thermal power plant, a cement-based solidifying material, and an admixture are mixed at a predetermined weight ratio. The weight ratio is set to about 3 to 7 parts by weight of coal ash with respect to 1 part by weight of the cementitious solidified material. The coal ash, cement-based solidifying material and admixture are kneaded with a mixer to produce a mixture M.
Thereafter, the mixture M is rolled onto the crushed stone 2 spread on the roadbed 3 by using a plate, a roller, or the like to form the pavement layer 1.

Rolling is performed so that the surface strength of the pavement layer 1 is ² Nf / mm ² or more. By rolling to such surface strength, plant germination can be suppressed. In particular, for example, by providing permeable grass-proof pavement in the site of an overhead power transmission line tower, the germination of plants is suppressed, complaints from neighboring residents are not generated, and weeds are blocked by weeds. It is possible to prevent problems such as being difficult to enter.

  By the pavement method, the value based on the on-site test method for permeable asphalt pavement established by the Japan Road Association becomes 30 ml / second or more. Innumerable pores of 1 to 20 μm are formed in the clinker ash which is the coal ash. Therefore, by using the coal ash made of clinker ash for the pavement layer 1, the drainage and breathability are remarkably improved by the innumerable pores formed in the clinker ash.

  In this way, by using coal ash generated from the boiler of a thermal power plant for the pavement layer, industrial waste can be recycled and the functions of the pavement layer such as water permeability and herbicidal properties are improved. be able to.

  The present invention can be applied to a pavement method for forming a pavement layer on a roadbed.

It is a schematic sectional drawing which shows the ground where the water-permeable grass-proof pavement concerning one Example of this invention was given.

Explanation of symbols

1: Pavement layer 3: Roadbed M: Mixture

Claims (6)

Mixing a porous coal ash generated from a boiler of a thermal power plant, a cement-based solidified material, and an admixture at a predetermined weight ratio;
Rolling the mixture onto the roadbed to form a pavement layer,
The pavement layer is water permeable and has a surface strength that suppresses germination of plants, and is a water permeable grassproof pavement method. The water-permeable grassproof pavement method according to claim 1, wherein the surface strength is ² Nf / mm ² or more.   The water-permeable grass-proof pavement method according to claim 1 or 2, wherein the water-permeability is 30 ml / second or more based on a field test method for water-permeable asphalt pavement determined by the Japan Road Association. .   The water-permeable grassproof pavement method in any one of Claims 1-3 in which the said coal ash consists of clinker ash.   The water-permeable grass-proof pavement method according to any one of claims 1 to 4, wherein 3 parts by weight or more of coal ash is mixed with 1 part by weight of the cement-based solidified material.   6. The water-permeable grassproof pavement method according to claim 1, wherein the pavement layer has a thickness of 30 mm or more.

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