PREPARATION AND THERMAL INSULATING PERFORMANCE OF FOAM GEOPOLYMERS OPTIMIZED BY CENOSPHERE AND DIATOMITE
In recent years,foam geopolymer has been concerned as a new type of thermal insulation materials.For improving the thermal insulating performance of foam geopolymer,the effects of cenospheres and diatomite,which have distinct different pore structures,on the preparation and thermal insulating performance of light-weight (density<300 kg/m3) foam geopolymers were explored.Results under this particular experimental conditions show that,cenospheres had no significant effect on the workability of geopolymer slurry and the dry density of foam specimens.A moderate amount of cenospheres could improve the compressive strength of foam specimens,and the optimal amount is about 7.5% by mass of Si and A1 raw materials.The workability of geopolymer slurry mixed with diatomite powders became worse,however,foam specimens could still be successfully synthesized after adjustment with water.When diatomite powders were added within 0-15% by mass of Si and Al raw materials,the dry density of foam specimens decreased firstly and increased subsequently.The compressive strength decreased consistently with increasing diatomite powders.The shape and size of pores which were almost spherical and homogeneously distributed in foam geopolymers,were not influenced by the addition of cenosphere and diatomite powders.The thermal conductivity of foam geopolymer was effectively reduced by closed pore cenosphere,but was not significantly influenced by open pore diatomite.Micro aggregate with closed pores has a better effect than that with open pores in improving the thermal insulating property of geopolymer foams.
foam geopolymer porous micro aggregate thermal insulation property cenospheres diatomite
Gongji YANG Duyou LU Xianrui CHEN Yafeng SUN Zhongzi XU
College of Materials Science and Engineering,Nanjing Tech University,Nanjing 210009,China
国际会议
长沙
英文
153-163
2014-06-01（万方平台首次上网日期，不代表论文的发表时间）