防水抗裂砂浆的试验研究

发布时间：2018-01-29 12:41

本文关键词： 防水抗裂砂浆力学性能抗渗性干缩　出处：《石家庄铁道大学》2015年硕士论文　论文类型：学位论文

【摘要】：本文分别通过正交试验和平行试验研究了可再分散乳胶粉、聚丙烯纤维以及废旧轮胎橡胶粉三种材料的掺量对防水抗裂砂浆的力学性能、抗渗性以及干缩的影响规律。正交试验结果表明,橡胶粉,可再分散乳胶粉和聚丙烯纤维均对防水抗裂水泥砂浆的稠度和力学性能有影响,其影响的主次顺序为橡胶粉可再分散乳胶粉(聚丙烯纤维。并由砂浆稠度和28d强度的试验结果,可确定出上述三种材料在水泥防水砂浆中的最优掺量为:再分散乳胶粉掺量为水泥质量的2%,聚丙烯纤维的掺量为水泥质量的0.2%,橡胶粉的掺量为水泥质量的10%。平行试验结果表明,单掺可再分散乳胶粉能够大大提高砂浆的粘结抗拉强度,但是却使砂浆的抗折强度和抗压强度降低,同时增加砂浆的韧性;单掺聚丙烯纤维同样导致砂浆的抗压强度减小,抗折强度增加,使其韧性增加,抗裂性能提高。单掺橡胶粉会引起砂浆的粘结强度、抗压强度和抗折强度降低,而复掺乳胶粉、纤维和橡胶粉后,当橡胶粉掺量在15.0%以内时,其粘结强度都比素砂浆要高。单掺可再分散乳胶粉、聚丙烯纤维以及15%以内的橡胶微粒均提高砂浆的抗渗性,降低砂浆的干缩率。在砂浆中按正交试验确定的最优掺量复掺可再分散乳胶粉、橡胶粉和聚丙烯纤维时,防水抗裂砂浆的抗渗性最好,干缩率最小,抗开裂能力最强。
[Abstract]:In this paper, the mechanical properties of waterproof and crack resistant mortar were studied by orthogonal test and parallel test, respectively. The content of redispersible latex powder, polypropylene fiber and waste tire rubber powder were used to study the mechanical properties of waterproof and crack resistant mortar. Orthogonal test results show that rubber powder, redispersible emulsion powder and polypropylene fiber have influence on the consistency and mechanical properties of waterproof and crack resistant cement mortar. The order of influence is rubber powder redispersible latex powder (polypropylene fiber) and the test results of mortar consistency and 28d strength. The optimum content of the above three materials in cement waterproof mortar can be determined as follows: the content of redispersed emulsion powder is 2% of cement quality, and the content of polypropylene fiber is 0.2% of cement quality. The addition of rubber powder is 10% of cement quality. The results of parallel test show that the adhesive tensile strength of mortar can be greatly improved by adding single dispersible latex powder, but the flexural strength and compressive strength of mortar are decreased. At the same time, increase the toughness of mortar; The compressive strength, flexural strength, toughness and crack resistance of mortar were also decreased by adding polypropylene fiber, and the bond strength, compressive strength and flexural strength of mortar were decreased by the addition of rubber powder. When the amount of rubber powder is less than 15.0%, the bond strength of rubber powder is higher than that of plain mortar. Polypropylene fiber and rubber particles within 15% can improve the impermeability of mortar and reduce the dry shrinkage of mortar. When rubber powder and polypropylene fiber are used, the waterproof and crack resistant mortar has the best impermeability, the smallest dry shrinkage rate and the strongest cracking resistance.
【学位授予单位】：石家庄铁道大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TQ177.6

【引证文献】