Effect of Functional Chemical Admixtures on the Performance of Cement Asphalt Mortar Used in Ballastless Track

作     者：蒋金洋 SHE Wei LI Wei PAN Li 

作者机构：Jiangsu Key Laboratory for Construction Materials Southeast University Jiangsu Institute of Building Science Co.LTD 

出 版 物：《Journal of Wuhan University of Technology(Materials Science)》 (武汉理工大学学报（材料科学英文版）)

年 卷 期：2015年第30卷第5期

页      面：995-1000页

核心收录：

学科分类：08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0702[理学-物理学] 

基　　金：Funded by the National Natural Science Foundation of China(Nos.U1134206,51178230) the Technological Development Projects of China Railway Engineering Corporation(No.Z2013-038-3) 

主　　题：cement asphalt mortar chemical admixture frost resistance fatigue resistance pore structure microstructure 

摘      要：Chemical admixtures are of paramount importance to the performance of modern cement based composites. In this paper, we performed a series of tests to investigate the effects of chemical admixtures on the cement asphalt mortar(CA mortar), i e, compressive strength, frost resistance, permeability, fatigue resistance, pore structure and microstructure. In particular, two types of chemical admixtures were tested, i e, defoamer(tributyl phosphate(TBP)) and polycarboxylate superplasticizer(PS). The results indicate that the addition of TBP and PS eliminates big bubbles and promotes small non-connected pores forming in matrix. Besides, an optimum dosage of TBP and PS may be determined with respect to the frost resistance, permeability and fatigue resistance of CA mortar. Further elaborative discussions are presented as well as experimental evidences from mercury intrusion porosimetry, scanning electron microscopy and energy dispersive spectroscopy.