PURPOSE:To simply reduce kinds of agents added and to shorten setting time by adding water to a mixture of a given amount of coal ash and alpha type hemihydrate, kneading and molding at normal temperature under normal pressure. CONSTITUTION:20-80 pts.wt. coal ash is blended with 80-20 pts.wt. alpha type hemihydrate to give 100 pts.wt. mixture, which is kneaded with 40-50 pts.wt. water to give mixed powder slurry. Then the slurry is cast into a mold at normal temperature under normal pressure to produce set materials.
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