Rheological Behavior, Segregation, Microstructure, and Construction Quality of Cement-Emulsified Asphalt Mortar with Associative Thickener
Publication: Journal of Materials in Civil Engineering
Volume 27, Issue 11
Abstract
Cement-emulsified asphalt mortar (CAM) is a critically important engineering material for a slab ballastless track. Segregation, which results in a density difference between the upper and lower part of the hardened CAM, is the most important factor that affects construction quality in practice. With the aim of decreasing the segregation of CAM, a minute amount of associative thickener, in which the mass ratio of the thickener to emulsified asphalt was 0, 0.2, 0.4, 0.6, 0.8, and 1.0%, respectively, has been incorporated into CAM, and the effects were systematically studied in terms of rheological behavior, segregation, microstructure, and construction quality of CAM. The results showed that the segregation resistance of hardened CAM was dramatically improved by increasing the thickener, whereas the rheological behavior characterized by the workability and fluidity indexes was prone to worsen. Considering the technical and economic aspects, an optimum mass ratio of the associative thickener to emulsified asphalt of 0.4% was recommended. Simultaneously, the microstructure analysis indicated the proper amount of thickener takes an active role in the compacting matrix and in refining the pores of the hardened CAM. Furthermore, in the practical application, the thickener could increase both the surface hardness and homogeneity of CAM.
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Acknowledgments
This research was supported by the China Railway Corporation Science and Technology Research and Development Program under Grant No. 2013G008-D, National Basic Research Program of China (973 Program) under Grant No. 2010CB736102, and China Academy of Railway Science Foundation under Grant No. 2010YJ75 and 2014YJ017. The authors are grateful to Professor Xie Yongjiang, Li Huajian, and Xin Xuezhong, the Chief Engineer of the Hangzhou-Changsha Railway Passenger Dedicated Line Zhejiang Co., Ltd, for their useful comments and suggestions. The authors are also grateful to Mr. Qiu Jiangen, the Minister of the Safety and Quality Department of the Beijing-Fuzhou Railway Passenger Dedicated Line Anhui Co., Ltd., and Mr. Mei Jun, the Chief Engineer of the China TIESIJU Civil Engineering Group Co., Ltd., for their support with the material preparation and field experiments. The authors are also grateful to Mr. Peng Guanglin, the Chief Engineer of the Tangshan-Dunshi Construction Material Co., Ltd., for providing some raw materials and useful suggestions. The authors are also grateful to Professor Wang of Si Chuan University and Professor Zhang of the Wuhan University of Technology for helping with the English writing.
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Published In
Journal of Materials in Civil Engineering
Volume 27 • Issue 11 • November 2015
Copyright
© 2015 American Society of Civil Engineers.
History
Received: Jul 22, 2014
Accepted: Jan 14, 2015
Published online: Mar 11, 2015
Discussion open until: Aug 11, 2015
Published in print: Nov 1, 2015
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