Effects of Fillers on Properties of Asphalt-Concrete Mixture
Publication: Journal of Transportation Engineering
Volume 138, Issue 7
Abstract
The role of filler on the mechanical performance of asphalt-concrete mixture was investigated. Three wearing course (W3B) mixtures incorporating granite, hydrated lime, and kaolin as filler fractions were evaluated by the Marshall mix design method to determine their optimum asphalt content. The use of hydrated lime or kaolin as a filler requires more asphalt because of their relatively higher specific surface area. The highest stiffness performance was found for W3B-hydrated lime, followed by W3B-granite, and W3B-kaolin mixtures. W3B-hydrated lime and W3B-kaolin mixtures exhibited higher deformation resistance than that of W3B-granite mixture. The results showed that the presence of filler in an asphalt-concrete mixture affects the mixture’s performance in three ways: filler influences the amount of asphalt content, filler affects the workability during mixing and compaction, and the resultant properties of asphalt-filler mastic contribute to the mixture’s performance. The results show that the properties of the filler determine its interaction with asphalt and its contribution to the mixture’s performance.
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Acknowledgments
Ms. Zulkati gratefully thanks the School of Civil and Environmental Engineering, Nanyang Technological University, Singapore for providing the research scholarship and all resources in support of her study. The comments and feedback from two anonymous reviewers have greatly improved the quality of the manuscript. The authors also would like to thank undergraduate students Ms. Kai Hui and Ms. Qin Yi for their invaluable help and contribution in performing some parts of the laboratory tests. The results and interpretation of the data analyses are completely the views of the authors.
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Information & Authors
Information
Published In
Journal of Transportation Engineering
Volume 138 • Issue 7 • July 2012
Pages: 902 - 910
Copyright
© 2012. American Society of Civil Engineers.
History
Received: Apr 21, 2011
Accepted: Dec 20, 2011
Published online: Dec 23, 2011
Published in print: Jul 1, 2012
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