橡胶集料水泥浆基体微观分析及其性能改善研究

发布时间：2018-07-15 19:14

【摘要】：由于普通水泥混凝土路面的种种工作性能缺陷严重限制了其推广应用,添加各种外掺剂的改性水泥砂浆的相关研究便成为重要课题。橡胶水泥混凝土便是其中一种比较常见的改性水泥混凝土材料。但橡胶粉的掺加对水泥混凝土和水泥砂浆的强度及收缩性能有一定的影响,具体表现为橡胶集料改性水泥基体的抗压强度有一定程度上的下降,而其抗收缩性能则有一定的增强。本文利用X射线衍射试验和压汞试验等技术,对掺加橡胶颗粒的水泥基体中橡胶颗粒的改性机理及其微观结构进行研究,分析橡胶颗粒水泥砂浆的水泥水化产物物相种类和橡胶颗粒对水泥水化反应速率的影响以及橡胶颗粒水泥砂浆的内部孔径分布特性。实验结果表明橡胶颗粒的掺入并不会使水泥水化反应生成新的物相结构,但橡胶颗粒会减缓水泥的水化反应速率。同时橡胶颗粒的加入导致水泥砂浆的孔隙率增加,其内部微小孔比例下降而大孔比例增加,整体孔径变大。同时本文尝试在橡胶集料改性砂浆中加入一定量的聚合物和偶联剂作为外加剂,研究两种改性剂加入之后的橡胶集料水泥砂浆的抗压强度和抗折强度的变化规律,并且利用XRD试验研究两种物质对于水泥水化反应速率的影响。研究结果表明,聚合物橡胶水泥砂浆的抗压强度和抗折强度随着聚合物掺量的增加而明显下降,偶联剂对橡胶水泥砂浆的抗压强度和抗折强度的提高有十分显著的作用。两者均不会使水泥水化反应生成新的物相结构,但可能会影响水泥水化反应速率。本文的研究结果同时也表明,向橡胶水泥砂浆中同时掺入适量的聚合物和偶联剂不仅可以改善其抗压强度和抗折强度等宏观力学性能,还可以在一定程度上改善其抗干缩性能,降低其前期收缩量。
[Abstract]:Due to various performance defects of ordinary cement concrete pavement, its popularization and application are seriously restricted, so the research on modified cement mortar with various admixtures has become an important subject. Rubber cement concrete is one of the most common modified cement concrete materials. However, the addition of rubber powder has a certain influence on the strength and shrinkage of cement concrete and cement mortar. However, its anti-shrinkage performance is enhanced to a certain extent. In this paper, the modification mechanism and microstructure of rubber particles in cement matrix were studied by means of X-ray diffraction test and mercury injection test. The types of cement hydration products of rubber particle cement mortar, the effect of rubber particles on cement hydration reaction rate and the internal pore size distribution characteristics of rubber particle cement mortar were analyzed. The results show that the addition of rubber particles does not result in a new phase structure of cement hydration reaction, but rubber particles can slow down the hydration reaction rate of cement. At the same time, the addition of rubber particles leads to the increase of the porosity of cement mortar, the decrease of the proportion of tiny pores in the cement mortar and the increase of the proportion of large pores, and the increase of the overall pore size. At the same time, this paper tries to add a certain amount of polymer and coupling agent to the rubber aggregate modified mortar as admixture to study the change of compressive strength and flexural strength of rubber aggregate cement mortar after the addition of the two modifiers. The effect of two substances on the hydration reaction rate of cement was studied by XRD test. The results show that the compressive strength and flexural strength of polymer rubber cement mortar decrease obviously with the increase of polymer content, and the coupling agent plays an important role in improving the compressive strength and flexural strength of rubber cement mortar. Neither of them can make the hydration reaction of cement form a new phase structure, but it may affect the hydration rate of cement. The results of this paper also show that the addition of appropriate amount of polymer and coupling agent to the rubber cement mortar can not only improve the macroscopic mechanical properties, such as compressive strength and flexural strength, but also improve its dry shrinkage resistance to a certain extent. Reduce its early contraction.
【学位授予单位】：东南大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U414

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