白云岩石粉对水泥胶凝体系力学性能及孔结构的影响

Effect of Dolomite Powder on Mechanical Properties and Pore Structure of Cement Binding System

对掺白云岩石粉的水泥胶凝体系的抗折强度、抗压强度以及微观孔结构进行了研究。结果表明:白云石粉的掺入会降低水泥胶凝体系的抗折强度与抗压强度,且掺量越高,强度下降越显著;随着水化的进行,白云岩石粉对水泥胶凝体系的微观孔结构有一定优化作用,表现为有害孔减少、无害孔增加、平均孔径下降,但总孔隙率变化不大。白云岩石粉在水泥胶凝体系中可以起到微集料填充作用,水化活性效应有限。

The effect of dolomite powder on flexural strength,compressive strength and pore structure of cement binding material were studied.The results showed that incorporation of dolomite powder leads to a decrease of the flexural and compressive strength of the complex binder,and the strength decreased more apparent while the dosage was higher.As the hydration progressed,the microscopic pore structure of cement binding material has been optimized,such as proportions of harmful hole reduced and proportions of harmless hole increased,and the average pore size decreased,but little change in total porosity.Dolomite powder in the cement binding system can play the role of micro-aggregate filler,and its hydration activity effect is limited.