Strength and thermal behavior of low weight foam geopolymer using circulating fluidized bed combustion fly ash  

作　　者：刘泽 邵宁宁 秦俊峰 孔凡龙 王春雪 王栋民 

机构地区：[1]Research Institution of Concrete and Eco-materials, School of Chemical and Environmental Engineering, China University of Mining & Technology

出　　处：《Journal of Central South University》2015年第9期3633-3640,共8页中南大学学报（英文版）

基　　金：Project(20120023110011) supported by Doctoral Program of Higher Education of China;Projects(2009KH09,2009QH02) supported by the Fundamental Research Funds for the Central Universities of China

摘　　要：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 Si O2/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 ℃ were investigated. The specimen with Si O2/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 ℃.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 Si O2/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 Si O2/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.

关 键 词：foam geopolymer circulating fluidized bed combustion fly ash thermal analysis MICROSTRUCTURE STRENGTH 

分 类 号：TQ317[化学工程—高聚物工业]