偏高岭土基地聚合物制备及性能研究

Synthesis and Properties of Metakaolin Based Geopolymer

选取n（SiO2）：n（Al2O3）、n（Na2O）：n（Al2O3）、n（H2O）：n（Al2O3）摩尔比为因素设计正交实验，以高岭土为主要原料制备了偏高岭土基地聚合物。依据高岭土的TG-DSC曲线和地聚合物试样抗压强度确定高岭土最佳煅烧温度为800℃。根据正交实验抗压强度结果分析了各因素的影响规律，确定最佳配比为：n（SiO2）：n（Al2O3）为4、n（Na2O）：n（Al2O3）为0．8、n（H2o）：n（Al2O3）为17。对试样进行XRD表征，结果表明，XRD在20°～40°出现非晶馒头峰，可见已合成一种“半晶态”物质。

The n（SiO2） ： n（Al2O3）, n（Na2） ： n（Al2O3） and n（H2O） ： n（Al2O3） molar ratios were investigated by orthogonal experiment. The metakaolin based geopolymer was synthesized by kaolin. The optimum calcination temperature of kaolin was 800 ~C based on the TG-DSC curve of kaolin and compressive strength of specimens. Based on compressive strength, the effects of the three molar ratios were analyzed, the optimum molar ratio was n（SiO2） ： n（Al2O3） being 4, n（Na2O） ： n（Al2O3） being 0.8, n（H2O） ： n（Al2O3） being 17. X-ray Diffraction （XRD） was used to characterize the sample, the XRD analysis results indicated that the amorphous hump of metakaolin appeared at 20° -40°, a semi crystalline material was synthesized.