| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a method for inexpensively producing high quality artificial lightweight aggregate reduced in the absolute dry specific gravity with the addition of a small quantity of an easily obtainable low cost additive and capable of exhibiting high strength with a relatively low temp. treatment and the artificial light weight aggregate obtained by the method. SOLUTION: The producing method of the artificial lightweight aggregate is by mixing a foaming agent and if necessary, a binder with coal ash of a main raw material and crushing, wet-kneading the crushed material with a m.p. decreasing agent consisting of an alkali metal silicate, molding, drying and firing. The firing is performed at 950-1300 deg.C, the adding quantity of the alkali metal silicate per total aggregate blending materials is >=0.5 wt.% to <=10 wt.%. The foaming agent is composed of iron oxide and at least one kind of silicon carbide or a carbonaceous material. The artificial lightweight aggregate obtained by the method has a absolute dry specific gravity of 0.5-1.5, >=50 kgf compression breaking load and <=15% water absorption.</p> |
