Effect of Functional Chemical Admixtures on the Performance of Cement Asphalt Mortar Used in Ballastless Track
来源期刊：Journal Of Wuhan University Of Technology Materials Science Edition2015年第5期
论文作者：蒋金洋 SHE Wei LI Wei PAN Li
文章页码：995 - 1000
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.
蒋金洋1，SHE Wei1,2，LI Wei1,2，PAN Li1
1. Jiangsu Key Laboratory for Construction Materials, Southeast University2. Jiangsu Institute of Building Science Co.LTD
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.
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