| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a method for manufacturing lightweight aggregate consisting of coal ash for obtaining high specific strength and stable quality when the coal ash is aggregated by steam curing. SOLUTION: The lightweight aggregate is formed by adding prescribed amounts of high-early-strength cement, quicklime, gypsum and water to the coal ash to prepare a slurry, further adding metal aluminum powder to the slurry, foaming the slurry, holding the foam in the slurry and curing the slurry to prescribed hardness, then palletizing the slurry, coating the surfaces of the pellets with dry powder and subjecting the pellets to steam curing in an autoclave. Accordingly, the artificial lightweight aggregate which is particularly light in weight of a non-firing type may be efficiently produced at a low cost from the coal ash generated from coal-fired thermal power stations, coal fired boilers, etc., as raw material.</p> |
