水泥乳化沥青混凝土应用技术研究

发布时间：2018-10-04 22:05

【摘要】：水泥乳化沥青混凝土是由水泥、乳化沥青、集料和外加剂等拌和而成的新型半柔性路面材料。具有凝结硬化快、早期强度高、体积收缩小、后期强度不倒缩、长期耐久性良好，，兼具了水泥混凝土和沥青混合料的优点，应用前景非常广阔。本文在综合国内外相关研究成果的基础上，通过实验研究和理论分析，对水泥乳化沥青混凝土配比设计、物理力学性能、耐久性、应用技术、强度形成机理进行了系统的研究，并借助扫描电镜等分析手段，研究了水泥乳化沥青混凝土的微观结构，为该材料的发展提供了重要参考依据。文章研究了水泥乳化沥青混凝土中乳化沥青、水泥、集料和外加剂之间的相适性，根据原材料中水胶比、砂率、各个材料的比例等制备参数确定水泥乳化沥青混凝土基准配合比，通过水泥乳化沥青混凝土的物理力学性能、路用性能及耐久性能的影响规律，确定了原材料和关键参数的范围，提出了水泥乳化沥青混凝土的配合比设计方法。通过对水泥乳化沥青混凝土的强度形成机理研究,发现，其强度主要是由胶凝材料和乳化沥青共同作用形成的，水泥的水化过程加速了乳化沥青的破乳，而乳化沥青破乳后又为水泥的水化提供了一定的水分。水泥的水化过程与乳化沥青破乳胶结形成乳化沥青混凝土的网状互穿结构，水泥水化产物和沥青形成的互穿结构粘附胶结在集料上提高了乳化沥青混凝土柔性和韧性，同时也提高了乳化沥青混凝土的早期强度、高温性能及水稳定性。根据扫描电镜测试结果可知，水泥乳化沥青浆体内部残留沥青与集料、未水化的水泥颗粒和水化产物相互缠绕形成空间网络，浆体内部孔隙较多，表面凹凸不平，这种结构符合了水泥乳化沥青混凝土半柔性材料的特征。
[Abstract]:Cement emulsified asphalt concrete is a new type of semi-flexible pavement material, which is composed of cement, emulsified asphalt, aggregate and admixture. It has the advantages of fast setting and hardening, high early strength, small volume shrinkage, no shrinkage of later strength, good long-term durability, and has the advantages of both cement concrete and asphalt mixture, and has a very broad application prospect. Based on the research results at home and abroad, this paper systematically studies the proportion design, physical and mechanical properties, durability, application technology and strength forming mechanism of cement emulsified asphalt concrete through experimental research and theoretical analysis. The microstructure of cement emulsified asphalt concrete is studied by means of scanning electron microscope and so on, which provides an important reference for the development of this material. This paper studies the compatibility of emulsified asphalt, cement, aggregate and admixture in cement emulsified asphalt concrete. The preparation parameters such as the ratio of each material are used to determine the standard mix ratio of cement emulsified asphalt concrete. The influence law of physical and mechanical properties, road performance and durability of cement emulsified asphalt concrete is obtained. The range of raw materials and key parameters is determined, and the design method of mixture ratio of cement emulsified asphalt concrete is put forward. Through the study of the strength forming mechanism of cement emulsified asphalt concrete, it is found that the strength of cement emulsified asphalt concrete is mainly formed by the interaction of cementing material and emulsified asphalt, and the hydration process of cement accelerates the demulsification of emulsified asphalt. And emulsified asphalt demulsification provides some moisture for cement hydration. The hydration process of cement and emulsified bitumen demulsification cementing form the network interpenetrating structure of emulsified asphalt concrete, and the cement hydration product and the interpenetrating structure adhesive cement formed by asphalt improve the flexibility and toughness of emulsified asphalt concrete on the aggregate. At the same time, the early strength, high temperature performance and water stability of emulsified asphalt concrete are improved. According to the results of SEM, the residual asphalt and aggregate, unhydrated cement particles and hydration products intertwine to form a space network, and there are many pores in the slurry, and the surface is uneven. This structure accords with the characteristics of cement emulsified asphalt concrete semi-flexible material.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U414

【参考文献】