矿粉改善水泥-石灰石粉砂浆孔结构的研究

Research on Improvement of Ground Slag on Pore Structure of Cement-ground Limestone Mortar

采用可蒸发水含量法研究了矿粉对水泥-石灰石粉砂浆孔结构的改善作用。结果表明,石灰石粉和矿粉掺量对水泥胶凝体系的初始孔隙率影响较小。7 d龄期时,水泥砂浆总孔隙率、大孔孔隙率和大孔比例随石灰石粉掺量增加先减小后增加,小孔孔隙率和小孔比例先增加后减小,石灰石粉掺量为10%时取得最大值或最小值;28 d龄期时水泥砂浆总孔隙率、大孔孔隙率、小孔孔隙率和大孔比例均随之增大,产生孔粗化效应。随着矿粉掺量增加,水泥-石灰石粉砂浆的7 d和28 d总孔隙率、大孔和小孔孔隙率减小,小孔比例增加。

The pore structure of cement mortars with ground limestone and improvement of ground slag by calculating the evaporable water in this paper. The results show that, the ground limestone and ground slag content had less effect on the initial porosity of cementitious material. With the increasing ground limestone content, the total porosity, macroporous porosity and proportion of mortars with 10% ground limestone were smallest at the age of 7 days while the microporous porosity and proportion reached the maximum. At the age of 28 days, the total, macroporous and microporous porosity of mortars increased, while the microporous proportion decreased. With the increase of ground slag content, the total porosity, macroporous and microporous porosity of cement-limestone mortar decreased on the 7 th and 28 th day, and the proportion of small pores increased.