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摘要胶粉改性水泥基材作为一种建筑新材料，有着广泛的应用前景，而强度的降低成为关键问题。本文研究了改性水泥砂浆的凝结时间和胶粉改性水泥砂浆的基本性能。实验表明在水泥砂浆中添加改性剂能够影响水泥净浆的凝结时间，且不同类型的改性剂会产生不同的影响。在胶粉改性水泥砂浆试验中，用废旧轮胎橡胶颗粒等体积替代黄砂并添加改性剂，研究橡胶粉掺量和改性剂掺量对水泥砂浆力学性能的影响。研究结果表明，胶粉改性水泥砂浆的抗折强度和抗压强度均较基准水泥砂浆的低，且强度随着橡胶粉掺量的增加而逐渐减小，而胶粉改性水泥砂浆中添加改性剂则会进一步的降低试件的强度。试验中还发现橡胶改性水泥砂浆的破坏模式与普通砂浆的脆性破坏模式相比截然不同，表现出一定的延性破坏特征，表明橡胶粉的掺入可以阻碍裂缝的开展。另外试验也表明，胶粉的掺入增加了水泥砂浆的孔隙率和孔平均直径同时也降低了试件的表观密度。43107
关键词 胶粉 水泥砂浆 改性剂 力学实验
毕业设计说明书（毕业论文）外文摘要
Title Basic Mechanical Performance of Waste Rubber Modified Cement Mortar
Abstract
This paper studies the jelling time of modified cement mortar and the basic properties of crumb rubber modified cement mortar. Experiments show that
modifiers can affect the jelling time of cement paste cement mortar,and different types of modifiers will produce different effects. In the rubber modified cement mortar test, waste tire rubber particles with an equal volume of alternative yellow sand and add modifier , and study the impact modifier content and rubber powder content on the mechanical properties of cement mortar. The results showed that flexural strength and compressive strength of rubber modified cement mortar is lower than standard cement mortar, and decreases gradually ,with the increase of rubber powder content .While modified agents were added into the rubber modified cement mortar,it will further reduce the strength of the specimen. Test also showed that the failure mode of Rubber fine aggregate cement mortar was quite different from the brittle failure mode of ordinary mortar. It showed some characteristics of ductile failure, which indicated that the incorporation of rubber powder can impede cracks. Further tests also showed that the powder incorporation increased the porosity of the cement mortar and the average pore diameter, but also reduces the apparent density of the specimen.
Keywords powder cement mortar modifier mechanics experiment
目 次
1. 绪论 1
1.1 选题背景 1
1.2 研究现状 1
1.3 研究内容 2
1.4 研究方法 2
1.5 本毕业课题的内容结构 3
2. 水泥净浆凝结实验 4
2.1 实验方案设计 4
2.2 凝结实验 4
2.3 小结 11
3 胶粉改性水泥砂浆试件的力学性能实验 12
3.1 实验方案设计 12
3.2 力学实验 12
3.3 抗折实验 14
3.4 抗压实验 15