Strength and thermal behavior of low weight foam geopolymer using circulating fluidized bed combustion fly ash
来源期刊：中南大学学报(英文版)2015年第9期
论文作者：LIU Ze SHAO Ning-ning QIN Jun-feng KONG Fan-long WANG Chun-xue WANG Dong-min
文章页码：3633 - 3640
Key words：foam geopolymer; circulating fluidized bed combustion fly ash; thermal analysis; microstructure; strength
Abstract: A comparative study of the influence of elevated temperature on foam geopolymer using circulating fluidized bed combustion fly ash (CFA) was reported. Foam geopoymers were prepared with different amounts of foam agent and different SiO2/Al2O3 molar ratios of 3.1, 3.4, and 3.8. The mechanical, thermo-physical properties and microstructure of the foam geopolymers before and after exposure to elevated temperature of 800, 1000, and 1200 °C were investigated. The specimen with SiO2/Al2O3 molar ratio of 3.8 exhibits the highest compressive strength, better microstructure and dimension stability before and after firing. Carnegeite, nepheline, and zeolite crystalline phases appearing after exposure may contribute to the good post-exposure strength. Low weight foam geopolymer using CFA can increase strength and maintain higher stability as high as 1000 °C.
LIU Ze(刘泽), SHAO Ning-ning(邵宁宁), QIN Jun-feng(秦俊峰), KONG Fan-long(孔凡龙), WANG Chun-xue(王春雪), WANG Dong-min(王栋民)
(Research Institution of Concrete and Eco-materials, School of Chemical and Environmental Engineering,
China University of Mining & Technology, Beijing 100083, China)
Abstract:A comparative study of the influence of elevated temperature on foam geopolymer using circulating fluidized bed combustion fly ash (CFA) was reported. Foam geopoymers were prepared with different amounts of foam agent and different SiO2/Al2O3 molar ratios of 3.1, 3.4, and 3.8. The mechanical, thermo-physical properties and microstructure of the foam geopolymers before and after exposure to elevated temperature of 800, 1000, and 1200 °C were investigated. The specimen with SiO2/Al2O3 molar ratio of 3.8 exhibits the highest compressive strength, better microstructure and dimension stability before and after firing. Carnegeite, nepheline, and zeolite crystalline phases appearing after exposure may contribute to the good post-exposure strength. Low weight foam geopolymer using CFA can increase strength and maintain higher stability as high as 1000 °C.
Key words:foam geopolymer; circulating fluidized bed combustion fly ash; thermal analysis; microstructure; strength
