Assessing Mechanical Properties of Hard Asphalt Mixtures with Different Design Methods
Publication: Journal of Materials in Civil Engineering
Volume 33, Issue 6
Abstract
Marginal hard asphalt possesses high stiffness and modulus; however, due to poor ductility at low temperature, it was seldom applied into road structures. Increasing asphalt content seemed to be an effective way to minimize the thermal cracking problem of hard hot-mix asphalt (HMA). Therefore, three types of methods (Groups 2–4) aiming to improve hard asphalt content were designed and compared with the traditional method (Group 1). Specifically, Groups 2 and 3 were designed with coarser gradation and lower gyration levels (), respectively, and Group 4 was designed following the enrobé à module élevé 2 (EME2) method. The high- and low- temperature, fatigue, modulus, and cracking performance were then conducted for each group. It can be seen that with the increase of asphalt content, the low-temperature strain increased in all three groups, of which Groups 2 and 3 improved more significantly. In addition, with the coarser gradation or lower , the high-temperature and cracking resistance of hard HMAs was lost to some degree; however, they can still compete with traditional neat HMAs. The hard HMAs designed with EME2 method performed excellent dynamic modulus and rutting resistance. Moreover, the hard HMAs designed with EME2 method and lower showed a surprising improvement in the fatigue life. These results may contribute to the better use of hard HMAs.
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Data Availability Statement
All data, models, and code generated or used during the study appear in the published article.
Acknowledgments
The research was supported by the grant from the National Key R&D Program of China (2018YFB1600100), Natural Science Foundation of China (NSFC, 51678443), and Science and Technology Innovation Program of Education Commission of Shanghai. The sponsorships are gratefully acknowledged.
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© 2021 American Society of Civil Engineers.
History
Received: Jan 29, 2020
Accepted: Sep 29, 2020
Published online: Mar 24, 2021
Published in print: Jun 1, 2021
Discussion open until: Aug 24, 2021
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