Fabrication and characterization of hardened bodies from Japanese volcanic ash using geopolymerization

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• 作者：Hayami Takeda ; Shinobu Hashimoto ; Haruka Kanie ; Sawao Honda ; Yuji Iwamoto
• 关键词：C. Mechanical properties ; D. Silicate ; E. Structural applications ; Volcanic ash
• 刊名：Ceramics International
• 出版年：April, 2014
• 年：2014
• 卷：40
• 期：3
• 页码：4071-4076
• 全文大小：1079 K

文摘

Hardened bodies were fabricated from Japanese volcanic ash after mixing with an alkali solution, molding, and curing. The volcanic ash was composed of approximately 70% crystalline anorthite sodium [(Ca, Na) (Si, Al)₄O₈] phase and 鈮?0% amorphous silicate phase. First, a starting mixture was prepared by mixing the ground volcanic ash with a sodium hydroxide solution. The mixture was placed in a plastic mold using a glass rod, and then cured at 50 掳C and 80% relative humidity for 3 days. The compressive strength of the resulting hardened body increased with increasing concentration of sodium hydroxide solution. When a 13.5 mol/L sodium hydroxide solution was used, the average compressive strength of the hardened body reached 80.1 MPa. The hardening mechanism for the volcanic ash during curing is discussed.