聚偏氟乙烯乳液改性砂浆的性能研究

关键字：聚偏氟乙烯,乳液,改性砂浆,性能,研究

（山东华伟银凯建材科技股份有限公司，山东 淄博  256410）

    摘要：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。
    关键词：聚偏氟乙烯乳液；改性砂浆；工作性；力学性能；长期耐久性能
    中图分类号：TU57+8.12        文献标识码：A        文章编号：1001-702X（2017）08-0050-04

Study on properties of polyvinyl fluoride latex modified cement mortars
CHEN Lingyan，HAN Fangfang，ZHOU Lina，ZHANG Ming，LI Xuehong，JIA Jitang
（Shandong Huawei Yinkai Building Materials Science and Technology Stock Co. Ltd.，Zibo 256410，China）

    Abstract：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.
    Key words：PVDF latex，modified mortar，workability，mechanical properties，long-term durability