水泥沥青复合砂浆拌合物乳化沥青破乳过程研究  

Research on the demulsification process of cement asphalt mortar mixture-emulsified asphalt

作　　者：李云良[1] 欧阳剑[1] 王山山[1] 纪伦[1] 赵九野[1] 谭忆秋[1] 

机构地区：[1]哈尔滨工业大学交通科学与工程学院,黑龙江哈尔滨150090

出　　处：《哈尔滨工程大学学报》2015年第7期997-1000,共4页Journal of Harbin Engineering University

基　　金：国家自然科学基金资助项目(51078114)

摘　　要：针对水泥沥青复合砂浆(CA砂浆)中乳化沥青的破乳过程,从CA砂浆固化过程中体系的粘度、颗粒粒径变化、水泥掺量对乳化沥青破乳的影响及乳化沥青的聚集过程的角度,分析了乳化沥青的破乳过程及其影响因素。研究表明:减水剂对乳化沥青粘度变化有较大影响,减水剂的用量越多,CA胶浆在低粘度状态下的保持时间越长,减水剂可调节乳化沥青的破乳速度。CA砂浆中乳化沥青的破乳过程分为3个阶段:水泥与乳化沥青的接触阶段、动态平衡阶段及加速破乳阶段。当水泥含量较多时,水泥颗粒被沥青包裹程度较小,水化速率较快,促进了乳化沥青的破乳和聚集。通过光学显微镜分析表明,CA砂浆中乳化沥青的破乳过程即是沥青颗粒的聚集结合过程。In this paper,the demulsification process and the influencing factors of the emulsified asphalt from the perspectives of CA mortar solidification process,particle size change,influence of cement content on emulsified asphalt emulsion,and emulsified asphalt aggregation process are analyzed. It studies at the demulsification process of emulsified asphalt in the composite cement asphalt mortar（ CA mortar）. The results show that the water reducer has significant effect on viscosity variation： low viscosity period lasts longer with amount of water reducer increasing and water reducer can adjust demulsification speed under cement influence. The process of emulsified asphalt demulsification can be divided into three periods： the period of cement contacting with emulsified asphalt,dynamic equilibrium period,and accelerated demulsification period. When the content of cement is large,cement particles are less coated by asphalt and the hydration rate is faster,which promotes breaking and aggregation of emulsified asphalt.The optical microscope observation analysis showed that the demulsification process is just the process of aggregation and combination of asphalt particles.

关 键 词：CA砂浆 乳化沥青 破乳 粘度 固化 减水剂 聚集 

分 类 号：TU528.2[建筑科学—建筑技术科学]