高岭土的增钙活化及其胶凝性能研究

Research on Activation Process of Added-calcium Kaolin and Its Cementitious Behaviour

本实验以徐州高岭土为研究对象,对其物性分析得知,其主要矿物组成为高岭石;对其采用高温煅烧过程中补充CaO的方法进行活化处理后,以30%掺量替代水泥,结合XRD分析和抗压强度检测,结果表明:CaO掺量不变,随着煅烧温度的升高,高岭土中活性SiO2、Al2O3和CaO逐渐反应生成新的矿相CS、CA,当煅烧温度为800℃时体系的抗压强度最大;相同煅烧温度下,随着CaO掺量增加至15%时,体系的抗压强度较高。

Kaolin from Xuzhou, its main mineral composition is kaolinite, is studied in this paper. Cement is replaced by 30% kaolin after it activated by adding CaO when calcining in high temperature. Combining with XRD analysis and compressive strength test, the results can approve that： As the content of CaO is invariable, the active SiO2, Al2O3 from kaolin gradually can react with CaO to form new mineral phases with the calcination temperature increasing, which are CS and CA. When the calcination temperature is 800℃, the compressive strength is the biggest. Under the same calcination temperature, and when the CaO content is 15%, the cementitious performance is better.