Empirical Study of High Strain Rate Loading and Fragmentation of Hot Mix Asphalt
Publication: Journal of Materials in Civil Engineering
Volume 32, Issue 9
Abstract
Dynamic fragmentation of hot mix asphalt (HMA) under high strain rate loading can be expected under various situations, such as milling, earthquakes, or explosions. This paper reports on an empirical study that was conducted to investigate the dynamic fragmentation of HMA, specifically with respect to energy of impact during loading. Samples of a surface course HMA, compacted to similar densities, were subjected to a series of impact loadings with different energies. The depth of penetration into the sample, strains during loading, and the resulting fragment sizes were evaluated. Impacts with higher energy levels produced more fragmentation and larger fragments. Both penetration and strains showed significant effects of impact energies. The size of the fragments showed good correlation with impact energy. These results can be utilized for controlling reclaimed asphalt pavement (RAP) gradation from milling and, hence, among other things, for constructing longer-lasting pavements.
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Data Availability Statement
Some or all data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request. These data include strain, fragment sieve analysis, bulk specific gravity and penetration data.
Acknowledgments
The authors acknowledge the help of Russ Lang, Laboratory Manager of the Civil and Environmental Engineering Department at Worcester Polytechnic Institute (WPI) for his help in the experiments and data acquisition.
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Published In
Journal of Materials in Civil Engineering
Volume 32 • Issue 9 • September 2020
Copyright
©2020 American Society of Civil Engineers.
History
Received: Oct 21, 2019
Accepted: Mar 31, 2020
Published online: Jun 30, 2020
Published in print: Sep 1, 2020
Discussion open until: Nov 30, 2020
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