Effect of Rectorite and Its Organic Modification on Properties of Bitumen
Publication: Journal of Materials in Civil Engineering
Volume 27, Issue 8
Abstract
Two organic rectorites (ORECs) were prepared by using cetyltrimethyl ammonium bromide (CTAB) and octadecyl dimethyl benzyl ammonium chloride (ODBA) as organic modifiers to modify the rectorites. Rectorite and OREC modified bitumens were prepared by melt blending. Microstructures of the modified bitumens were characterized by X-ray diffraction (XRD). The effect of rectorite (REC) and its organic modification on the physical and aging properties of bitumen was investigated. X-ray diffraction results show that REC and ODBA-REC modified bitumens form the intercalated nanostructure, whereas CTAB-REC modified bitumen forms an exfoliated nanostructure. Compared with RECs, ORECs show the better compatibility with the bitumen as well as the higher improvement in softening point, viscosity, and aging resistance of the bitumen. The CTAB-REC modified bitumen shows lower viscosity aging index values and softening point increment in comparison with the ODBA-REC modified bitumen, indicating its good aging resistance.
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Acknowledgments
This work was supported by the National Natural Science Foundation of China (No. 51308203) and the National Key Technology Research and Development Program of the Ministry of Science and Technology of China (2011BAE28B04). The work was also financially supported by the National Natural Science Foundation of China (No. 51278188) and the Open Fund of Key Laboratory of Special Environment Road Engineering of Hunan Province (Changsha University of Science & Technology, No. kfj120401). The authors gratefully acknowledge their financial support.
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Published In
Journal of Materials in Civil Engineering
Volume 27 • Issue 8 • August 2015
Copyright
© 2014 American Society of Civil Engineers.
History
Received: Jul 10, 2013
Accepted: Oct 29, 2013
Published online: Oct 31, 2013
Discussion open until: Sep 3, 2014
Published in print: Aug 1, 2015
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