| 摘要 |
PROBLEM TO BE SOLVED: To provide a producing method of super lightweight aggregate capable of firing a pellet after granulating as in hydrated state and stably obtaining a super lightweight aggregate having the specific gravity of <=0.8 in absolute dry condition and >=80kgf collapse strength. SOLUTION: The super lightweight aggregate is produced by adjusting the particle size of the pellet, which is obtained by granulating a rhyolite based vitreous mineral, a foaming agent and a sodium silicate aq, solution, and firing as in hydrated state. (1) The ryholite based vitreous mineral has 10-40μm average particle diameter, (2) in the sodium silicate, the molar ratio (SiO2 /Na2 O) of silicon dioxide to sodium oxide is 1.0-2.5, (3) the composition of the pellet is 0.1-2.0 pts.wt. foaming agent and the quantity of the sodium silicate equivalent to >=2.0 pts.wt. Na2 O in the sodium silicate per 100 pts.wt. ryholife based vitreous mineral and (4) the firing temp. is 900-1300 deg.C.
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