| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a method for producing an artificial lightweight aggregate, capable of inexpensively producing the artificial lightweight aggregate which has a high quality and a small absolute specific gravity and can express a high strength at a relatively low temperature, by adding a small amount of an easily available inexpensive additive, and to provide the artificial lightweight aggregate obtained by the method. SOLUTION: This method for producing the artificial lightweight aggregate comprises adding a binder, a foaming agent and a melting point-lowering agent comprising refuse incineration ash to coal ash, pulverizing the mixture, adding water to the pulverization product, molding the mixture, drying the molded product, and then calcining the molded product. The refuse incineration ash comprises main ash, flied ash or secondary flied ash, and is added in an amount of 1-10 wt.% (converted into an alkali metal oxide). The molded product is calcined in a temperature range of 950-1,300 deg.C. The foaming agent comprises an iron oxide and at least one of silicon carbide and a carbon material. The artificial lightweight aggregate obtained by the method has an absolutely dry specific gravity of 0.5-1.5.</p> |
