摘   要：通过压汞法研究了不同活性MgO对硬化水泥浆体孔结构的影响，探索了养护制度以及粉煤灰对外掺MgO硬化水泥浆体孔结构的影响规律。结果表明，40℃水养时，低活性值的MgO显著降低了硬化水泥浆体的孔隙率和毛细孔体积，优化了水泥浆体的孔结构；提高养护湿度或温度，促进了外掺MgO水泥浆体孔结构的优化分布；粉煤灰可进一步优化MgO水泥浆体的孔结构，即单掺MgO对水泥浆体孔结构的优化作用＜粉煤灰与MgO复掺的＜单掺粉煤灰的。

Abstract: The effects of MgO with different activities on pore structure of hardened cement paste are studied through using mercury intrusion method, and the influence laws of curing system and fly ash on pore structure of hardened cement paste with MgO are explored. The results show that the MgO with low activity can obviously decrease the porosity and capillary pore volume of hardened cement paste under 40℃ water curing, and it can optimize the pore structure of cement paste. Increasing the curing humidity or temperature can improve the optimum distribution of pore structure of cement paste with MgO. And fly ash also can optimize the pore structure of cement paste with MgO, which is better than single doped MgO or complex doped fly ash and MgO.