不同类型的水性聚合物水泥净浆的制备与分析.doc

安徽建筑工业学院 毕 业 论 文 专 业 无机非金属材料工程 班 级 二 班 课 题 不同类型水性聚合物水泥净浆的制备与研究 摘要 聚合物的加入对水泥基材料的相关性能改善有着重要作用，而对其改性机理的研究对聚合物水泥基材料的发展更是具有重要的指导意义。本次论文选用型号为“WWJF 8020”的聚乙烯醋酸乙烯酯（EVA乳胶粉）以及“05-88”型的聚乙烯醇（PVA）对水泥净浆进行改善，并通过反光显微镜及SEM观察浆体中晶体的生长情况及微结构改善状况；采用IR分析来了解聚合物在水泥浆体中的相关行为以及水化硅酸钙凝胶（C-S-H）的聚合度变化情况；最后利用XRD分析得出各组试样水化进程。 结果显示，两种水性聚合物的添加对水泥试样抗折强度均有改善，而PVA则更加显著；在聚合物浆体中的晶体更好的填充了水泥石中的孔洞及裂纹以改善其微结构；同时，EVA与水化产物发生反应，且反应生成的乙酸盐又促进了水泥水化；PVA的加入则增加了C-S-H的聚合度；对于不同龄期聚合物水泥试样的水化进程，EVA及PVA起着不同程度的影响。 关键词：水性聚合物水泥浆体；水化进程；IR、XRD及SEM分析；性能与微观结构 Abstract The properties of cement-based materials is significantly improved by adding a number of polymer.Similarly, the research on polymer modified mechanism has very important guiding significance for the polymer cement-base materials development. The paper selects model WWJF 8020 polyethylene vinyl acetate (EVA latex powder) and 05-88 type of polyvinyl alcohol (PVA) on the improvement of cement paste,and the later is better that EVA on the properties of flexural strength.By using reflective microscope and SEM to observe the growth of the crystal and micro-structure; by IR analysis to understand the related behaviors of the polymer in the cement paste and calcium silicate hydrate gel (CSH) changes in the degree of polymerization situation; Finally, XRD analysis of samples in each group obtained the hydration process. Research shows that the status of crystals which fill up the holes and cracks in polymer-modified cement paste is better than in OPC sample. And in this status the microstructure of cement paste can be improved. The use of infrared analysis is aware of that EVA powder could react with cement hydration products and the product of calcium acetate promotes the process of cement hydration, while PVA increases the degree of polymerization of the C-S-H. Finally, XRD analysis shows that the EVA powder and PVA in different curing times could make different results in the process of hydration. Key words: water-based polymer cement paste; hydration process; I