JPH02271952A - Production of water permeable product for civil engineering works - Google Patents

Abstract

PURPOSE:To effectively utilize coal ash and to obtain a water permeable product civil engineering works by mixing white cement with coal ash clinker of a specified grain size and a cement hardening agent, adding water to the mixture and carrying out molding by roll pressing and drying. CONSTITUTION:100 pts.wt. white cement is uniformly mixed with 100-500 pts.wt. coal ash clinker of 0.5-20mm, preferably 2-12mm grain size and 10-20 pts.wt. cement hardening agent. Water is added to the mixture and molding by roll pressing and drying are carried out to obtain a water permeable product for civil engineering works useful as tile, pavement, etc.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Field of Application> The present invention relates to a method for producing a water-permeable product for civil engineering whose main material is coal ash talin.

<Conventional technology> With the expansion of coal-fired power plants, coal ash is being produced in increasingly large quantities, but because it is not being used effectively, there is no place to dispose of it in landfills.

On the other hand, almost no water-permeable civil engineering products have been commercialized in the past, and there is currently a demand for water-permeable products that are indispensable to the structures of modern cities and that return rainwater underground.

<Problem to be solved by the invention> The present invention aims to create water-permeable products for civil engineering, which are desired to appear, by using coal ash, which is currently produced in large quantities but is not effectively utilized. The purpose is to

<Means for Solving the Problems> The object of the present invention is to cure cement with 100 to 500 parts by weight of coal ash clinker having a particle size of 0.5 to 20 m, preferably 2 to 12 m, to 100 parts by weight of white cement. agent 10
This can be achieved by mixing up to 20 parts by weight, adding water to the mixture, molding it by a compaction method, and drying it.

Regarding the particle size of the coal ash clinker used, if it becomes too small, less than 0.5 mm, the water permeability will deteriorate, so it is preferably 2 mm or more, but if it is too large and exceeds 20 mm, it will not work well in cement. If the strength of the product decreases due to insufficient wrapping, it is preferable to
Regarding the ratio of zero-order coal ash talin force, which is preferably 2 m or less, if it is less than 100 parts by weight, the effect of cement will be too strong and the mesh will become tight and water permeability will be poor, whereas if it exceeds 500 parts by weight. If the amount is too large, the product will not harden.
The amount is 0 to 500 parts by weight.

Next, the effect of the cement hardening agent will not be significant unless it is added in an amount of 10 parts by weight or more, and on the other hand, the degree of hardening will not change even if it exceeds 20 parts by weight, so the amount is set at 10 to 20 parts by weight.

<Example> Particle size 5 to 10 aws per 100 parts by weight of white cement
Mix 300 parts by weight of coal ash talin and 15 parts by weight of a commercially available cement hardener (NSC) and add water to make Te 100X.
It was charged into plastic molds of 250 x 80111n and 300 x 300 x 80 m, vibrated with a compaction vibrator, cured for 24 hours, and then sufficiently dried to form a tile-shaped product. As a result of examining the water permeability of this product, it was found to have 100% water permeability and sufficient strength.

Similarly, for 100 parts by weight of white cement, the particle size is 5 to 1.
Mix 300 parts by weight of 0mn+ coal ash talin and 15 parts by weight of a commercially available cement hardener (NSC), add water, spread it in 300 pieces, pressurize with a roller, and then cure thoroughly.
The dry composition was tested at the Okinawan Architectural and Civil Engineering Materials Testing Center and found to have a strength of 340 kg/c4, which is higher than the strength of normal concrete, which is 180 to 240 kg.
/cm, it was found that the strength was excellent.

<Effects of the Invention> As described above, according to the present invention, coal ash, which has not been used at all in the past, can be effectively used to produce civil engineering products with high water permeability, such as civil engineering tiles and It has many uses as a road paving stone.

Claims (1)

[Claims] 1. Particle size 0.5 to 100 parts by weight of white cement
A method for manufacturing a water-permeable product for civil engineering, which comprises mixing 100 to 500 parts by weight of 20 mm coal ash clinker and 10 to 20 parts by weight of a cement hardener, adding water to the mixture, molding it by a compaction method, and drying it. . 2. The method for producing a water-permeable product for civil engineering according to claim 1, wherein the particle size of the coal ash clinker is 2 to 12 mm.