Design Process of Asphalt Mixture Incorporating Compaction-Effort Variable
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VIEW THE REPLYPublication: Journal of Materials in Civil Engineering
Volume 32, Issue 8
Abstract
The Superpave mix design is a process of repeatedly optimizing the aggregate gradation and asphalt content in accordance with specified limits. As one of the important design parameters, the number of design gyrations () is adopted empirically to be a fixed number under a specific traffic level. Based on the concept of a performance-oriented approach, this study regarded as a variable design parameter and evaluated the influences of two design cases on the performance of asphalt mixture: variables and asphalt content (gradation unchanged) and variables and aggregate gradation (asphalt content unchanged). Two groups of experiments were designed. The first group used levels of 50, 75, and 100 gyrations, and less asphalt content was adopted with a higher . The second group used compaction levels of 50, 75, 100, and 125 gyrations, and coarser aggregate gradation was adopted with a higher . Both groups of experiments showed that with an increase in , rutting performance was increased and low-temperature performance was decreased. In addition, in the former group of experiments, fatigue performance was decreased with the increase of . Following these rules, this paper took Hainan province mix design as a case, and was optimized to meet requirements. It can be seen that regarding as design variable is necessary and can improve flexibility in the design.
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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. The contents of this paper reflect the views of the authors and do not necessarily reflect the official views or policies of the sponsors. This paper does not represent any standard or specification.
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©2020 American Society of Civil Engineers.
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Received: Oct 14, 2019
Accepted: Feb 6, 2020
Published online: May 29, 2020
Published in print: Aug 1, 2020
Discussion open until: Oct 29, 2020
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