磷酸镁水泥耐水性研究进展

Research Progresses in Water Resistance of Magnesium Phosphate Cement

磷酸镁水泥(MPC)是一种快凝快硬的新型胶凝材料,具有干缩小、抗冻性好、早期强度高等优良特性,应用于工程修补和有害物质的固化。从磷酸镁水泥的水化产物出发,分析了磷酸镁水泥耐水性的机理,讨论了其耐水性的影响因素,包括原料配比、MgO颗粒细度、养护湿度和温度、缓凝剂和水胶比,提出了通过使用防水剂、增加预养护时间、掺入外加剂和掺合料等措施改善磷酸镁水泥的耐水性。

Magnesium phosphate cement（ MPC） is a new rapid hardening cementitious material with fast condensation, which possesses many advantages including small dry shrinkage, excellent resistance to freezing, high early strength and so on, it has been applied to the engineering repair and solidification of harmful substances. Based on the hydration products of MPC, the mechanism of water resistance of MPC was analyzed, and the influence factors of the water resistance were discussed, such as proportion of raw materiasl, MgO grain fineness, curing humidity and temperature, retarder and so on. Some measures for improving water resistance of MPC were put forward, such as using the waterproofing agent, increasing maintenance time, adding additive and admixture.