Coal-fired power plants produce 4, 000, 000 ton of coal ash per annual in Japan.
Less than 50% of the coal ash is reused effectually as cement misxture etc., but the remains is dumped for landfill as industrial waste.
As a part of the coal ash utilization, we have commercialized architeactural ceramics made of coal ash. One products is paving blocks and one is cavity blocks. Coal ash characteristics for ceramic materials has been well seized in order to develop these materials. As the results of tests on the strength of materials, water absorption tests and freezing and melting tests, it has confermed that these materials had good aptitude for construction materials.
