高速铁路用水泥乳化沥青浆体的物理结构  

Physical structure of hardened cement asphalt paste for the slab track of high-speed railway

作　　者：邓德华[1] 田青[1] 刘赞群[1] 艾永强[1] 元强[1] 

机构地区：[1]中南大学土木工程学院高速铁路建造技术国家工程实验室,长沙410075

出　　处：《中国科学：技术科学》2014年第7期661-671,共11页Scientia Sinica(Technologica)

基　　金：国家重点基础研究发展计划(批准号:2013CB036201);国家自然科学基金(批准号:50878209)资助项目

摘　　要：基于硬化硅酸盐水泥浆体的Powers理论和水泥乳化沥青浆体的配合比,通过理论计算和X射线衍射(XRD)、扫描电子显微镜(SEM)、能量色散X射线谱仪(EDAX)等相分析方法,分析了硬化水泥乳化沥青浆体的物相组成与微结构.结果表明,硬化水泥乳化沥青浆体的物相组成与微结构取决于沥灰比和水灰比.提出了表征硬化水泥乳化沥青浆体物理结构的两种结构模型,以沥青为连续相、水泥相为分散相的有机-无机复合胶凝体结构模型—I型模型;以水泥相为基体、沥青嵌入其中的无机-有机复合胶凝体结构模型—II型模型.为深入分析高速铁路板式无砟轨道结构中水泥乳化沥青砂浆的微结构参数和力学性能及其衰变规律奠定了基础.In the present paper, through the calculation based on Powers＇ theories and models and the phase analyses by XRD, SEM and EDAX, the phase composition and microstructure of hardened cement asphalt pastes were studied. The results showed that the phase composition and microstructure of hardened cement asphalt pastes are dependent on both asphalt/cement and water/cement ratios. The two physical models for the microstructure of hardened cement asphalt pastes with different asphalt/cement ratios are proposed. I type structure model is characterized by the asphalt matrix and the disperse phases of cement hydrates. II type structure model is characterized by the matrix of cement hydrates and the disperse asphalt agglomerates. These models will contributed to the researches of the mechanical properties and degradation mechanism of cement asphalt mortars.

关 键 词：水泥乳化沥青浆体 物相组成 物理结构 结构模型 高速铁路 

分 类 号：U214.75[交通运输工程—道路与铁道工程]