Research on High- and Low-Temperature Properties of Asphalt-Mineral Filler Mastic
Publication: Journal of Materials in Civil Engineering
Volume 22, Issue 8
Abstract
In the asphalt mixtures, although asphalt is predominantly considered the binder holding the aggregates together, the actual product used to connect aggregate particles is the asphalt-mineral filler mastic which consists of the asphalt and mineral filler. The characterization of asphalt-mineral filler mastic is essential to improve the understanding of the response and performance of asphalt concrete pavements. It is also important to understand the high- and low-temperature properties of asphalt-mineral filler mastic. In this paper, the parameters of the viscous component of the repeat creep stiffness were evaluated using a dynamic shear rheometer; and the creep stiffness modulus was determined using a bending beam rheometer. The effects of filler/asphalt ratios (on a weight basis) on the high-temperature and low-temperature properties of different asphalt-mineral filler mastics were studied. The results showed that the rheological behavior of asphalt-mineral filler mastics are nonlinear, and follow an exponent function model. The curve can be separated into three components: the slowly changing phase, the transitional changing phase, and the fast changing phase. To more easily understand the two straight line models, we calculated the of the inflection point in the curve and determined that the optimal range of is 0.9–1.4 to balance the high-temperature and low-temperature properties from the aspect of interacting models of asphalts and mineral fillers. Furthermore, the approach to get the optimal ratio was discussed.
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Acknowledgments
The writers would like to acknowledge the financial support given by a grant from the National Natural Science Foundation of China (Grant No. NNSFC50778057) and the Ph.D. Programs Foundation of Ministry of Education of China (Grant No. UNSPECIFIED20060213002).
References
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Information & Authors
Information
Published In
Journal of Materials in Civil Engineering
Volume 22 • Issue 8 • August 2010
Pages: 811 - 819
Copyright
© 2010 ASCE.
History
Received: May 14, 2009
Accepted: Mar 6, 2010
Published online: Mar 16, 2010
Published in print: Aug 2010
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