对水泥浆体的线膨胀系数进行了研究。试验结果表明，28 d龄期水泥净浆的线膨胀系数受水泥细度影响显著，水泥浆体的线膨胀系数随水泥细度的增大而增大，呈线性增长关系；粉煤灰能显著降低水泥浆体的线膨胀系数，当粉煤灰掺量达到30％以上时，掺粉煤灰水泥砂浆的线膨胀系数差别不大；随着矿渣的掺入，水泥浆体线膨胀系数有增大的趋势；对水泥浆体线膨胀系数来说，复掺粉煤灰和矿渣粉并无突变现象。

In this paper, the thermal dilation coefficient (TDC) of cement is studied. The experimental results show that cement fineness has prominent effect on the TDC of cement paste for 28 day age, and the TDC of cement paste rises with the increase of cement fineness. So the linear formula on the relation between TDC and fineness is established. With adding fly ash, the TDC of cement paste or mortar is decreased obviously. When the amount of fly ash exceeds 30%, the TDC of cement mortar has a little change. The TDC of cement paste or mortar increases with mixing slag powder. But by mixing fly ash and slag powder, the change trend of the TDC of cement paste is not significant.