关键词: 微珠;超细矿粉;硅灰;干燥收缩;收缩模型

Abstract: Three kinds of superfine mineral admixture which were beads,ultra-fine powder and silica fume on drying shrinkage of high strength concrete were carried out,and fitted the test results by drying shrinkage model,then predicted the final shrinkage.The results show that beads and ultra-fine powder may both reduce drying shrinkage,the value of which was decreased obviously with mixing amount increasing.Silica fume can increase the drying shrinkage value,and the higher mixing amount is,the bigger drying shrinkage existes.The predicted curves obtained by the exponential equation are close to the measured values,and the goodness of fit is all above 99％.

Key words: bead;ultra-fine powder;silica fume;drying shrinkage;shrinkage model