Polymers can significantly improve the workability,flexural strength and corrosion resistance performance of cement-based materials. In this paper,the workability,mechanical properties and long-term durability of cement mortars modified by PVDF latex in different P/Cs were studied. The results show that the PVDF latex has some extent of water reduction effect to the cement mortars,and the water retention and cohesion property is good. In addition,the latex can increase the air content of cement mortars. It can improve the deformation ability of mortar,improve the defects of brittleness,and increase the tensile bond strength of mortar. Moreover,the modified mortars have higher resistance to chloride ion penetration,lower water absorption and higher anti-shrinkage performance.%聚合物可以显著改善水泥基材料的工作性、抗弯拉强度及耐腐蚀等性能.研究不同聚灰比(P/C)下,聚偏氟乙烯乳液对水泥砂浆工作性能、力学性能及长期耐久性能的影响.结果表明:聚偏氟乙烯乳液对水泥砂浆具有减水作用,且保水及粘聚性较好,同时具有一定的引气性;可提高砂浆的变形能力,改善脆性大的缺陷,增加砂浆的拉伸粘结强度;提高砂浆的抗氯离子渗透能力,且吸水率降低、抗收缩性能提高.
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