Effect of Various Organomodified Montmorillonites on the Properties of Montmorillonite/Bitumen Nanocomposites
Publication: Journal of Materials in Civil Engineering
Volume 22, Issue 8
Abstract
Three kinds of organomodified montmorillonites (OMMTs), OMMT1, OMMT2, and OMMT3, were prepared by using different organic modifiers. Nanocomposites of bitumen and three kinds of OMMTs were prepared by melt blending. X-ray diffraction (XRD) analysis was used to evaluate the degree of intercalation or exfoliation of OMMT and its dispersion in the bitumen. The effect of OMMTs on the physical and aging properties of the modified bitumen was studied. XRD results show that OMMT1-modified bitumen had an intercalated nanostructure, while OMMT2- and OMMT3-modified bitumens formed an exfoliated nanostructure. Compared with OMMT1-modified bitumen, the OMMT2- and OMMT3-modified bitumens showed a higher value of softening point and viscosity, and the better resistance to aging was due to the formation of exfoliated structure in the OMMT2- and OMMT3-modified bitumens. OMMT2 improved the aging resistance more remarkably than OMMT3, which can be attributed to the physical differences of the organic modifiers.
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Acknowledgments
This work is part of a research, Project 50773061, supported by the National Natural Science Foundation of China. The writers gratefully acknowledge its financial support.NNSFC
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Published In
Journal of Materials in Civil Engineering
Volume 22 • Issue 8 • August 2010
Pages: 788 - 793
Copyright
© 2010 ASCE.
History
Received: May 15, 2009
Accepted: Oct 6, 2009
Published online: Feb 6, 2010
Published in print: Aug 2010
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