Optimum Filler–Bitumen Ratio of Asphalt Mortar Considering Self-Healing Property
Publication: Journal of Materials in Civil Engineering
Volume 31, Issue 8
Abstract
Asphalt mortar plays an important role in the performance of asphalt mixtures. Up to now, there have been many studies on the properties of asphalt mortar. However, asphalt mortar requires a balanced design that considers the overall performance including self-healing capability. Therefore, this study aims to analyze the effect of different types of filler with varied ratios (0.11, 0.22, 0.33, 0.44, and 0.55) by volume on the performance of the asphalt mortar and mixture. The examined fillers were limestone, fly ash, diatomite, and four types of red mud, which were mixed with bitumen to prepare asphalt mortar. Then, the rheological properties of the asphalt mortar were investigated through viscosity tests and multiple stress creep recovery (MSCR) testing. In addition, this research explores the impact of filler type and its ratio on the cohesion and self-healing performance in dry and water conditions. Furthermore, the Hamburg wheel tracking test (HWTT) was performed to evaluate the moisture-damage and rutting resistance of asphalt mixtures, which consisted of the same selected mortar. The results indicate that pull-off tensile strength after the first failure-healing (F-H) cycle in the water condition has a good linear relationship with the dynamic stability of the asphalt mixture in the HWTT. Moreover, red mud and diatomite can be applied as promising substitute fillers compared with the other examined fillers in this study, but the chemical components need to be carefully selected.
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Acknowledgments
This study is supported by grants from Ministry of Science and Technology of the People’s Republic of China (Grant No. 2016YFE0108200), Science and Technology Commission of Shanghai Municipality (CN) (Grant Nos. 17230711300 and 16DZ1202004), Fund of Shanghai Peak Discipline (Grant No. 2016J012309), and the Fundamental Research Funds for the Central Universities (22120180093). The sponsorships are gratefully acknowledged. The contents of this paper only reflect the views of the authors and do not reflect the official views or policies of the sponsors.
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Published In
Journal of Materials in Civil Engineering
Volume 31 • Issue 8 • August 2019
Copyright
©2019 American Society of Civil Engineers.
History
Received: Aug 3, 2018
Accepted: Feb 11, 2019
Published online: May 28, 2019
Published in print: Aug 1, 2019
Discussion open until: Oct 28, 2019
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