煅烧煤系高岭土和硅粉用于混凝土的对比试验

用煅烧煤系高岭土细粉按一定比例等量取代水泥配制C50高性能混凝土,系统研究了硬化混凝土的力学性能和耐久性能。用工程常用的活性掺合料硅粉作平行试验进行对比,探讨煅烧煤系高岭土细粉代替硅粉用作混凝土活性矿物掺合料的可行性。试验结果表明,经700℃热处理得到的煅烧煤系高岭土具有相当高的水化活性,当掺量同为10%时,掺煅烧煤系高岭土混凝土具有良好的力学性能和耐久性能,而且其对混凝土抗折性能的增强效果优于硅粉。

Contrastive Research on Application of Calcined Kaolin from Coal Bearing Strata and Silica Fume in Concrete

The mechanical properties and duribility of C₅₀ high performance concrete which was prepared by equal quantity of calcined kaolin from coal bearing strata to replace of cement with the same proportion has been studied systematically. Then parallel tests are compared with active admixture silica fume that is commonly used in projects. The comparison showed that the calcined kaolin can acquire high hydration activity after calcined at 700 ℃. When cement was replaced with 10% admixture, the metakaolin concrete obtains excellent mechanical properties as well as duribility. Moreover, the metakaolin has a better effect on bending strength of concrete than that of silica fume.