Relationship of Coefficient of Permeability, Porosity, and Air Voids in Fine-Graded HMA
Publication: Journal of Materials in Civil Engineering
Volume 31, Issue 1
Abstract
The purpose of this study was to determine the relationship between the coefficient of permeability, porosity, and voids in total mixture (VTM) of fine-graded hot-mix asphalt (HMA). Two fine-graded HMA mixtures used in Michigan were prepared with the same binder contents (5.5%) and nominal maximum aggregate sizes (NMAS) of 9.5 mm and 12.5 mm, respectively. For each mixture, laboratory specimens were fabricated using a superpave gyratory compactor (SGC) with 25, 50, and 75 gyrations, respectively. The coefficient of permeability increased as the air void and porosity values increased. After the first moisture conditioning, the porosity and coefficient of permeability increased for most of the specimens. After the second moisture conditioning, it was observed that specimens had a reduced porosity and coefficient of permeability. There were significant differences for porosity and permeability before and after the first moisture conditioning. However, there were no significant differences for porosity and permeability before and after the second moisture conditioning. Regarding moisture conditioning, the 12.5-mm gradation tended to have a more stable structure than the 9.5-mm gradation. This tendency was indirectly observed from the rutting performance test. This study is helpful in the design of asphalt mixtures that can resist pore pressure damage.
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Acknowledgments
The authors express their appreciation to Isaac Pantti of Michigan Technological University for assistance in performing laboratory tests. Financial support for Siyu Chen from Michigan Technological University is gratefully appreciated.
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Information
Published In
Journal of Materials in Civil Engineering
Volume 31 • Issue 1 • January 2019
Copyright
©2018 American Society of Civil Engineers.
History
Received: Mar 30, 2018
Accepted: Jul 17, 2018
Published online: Nov 12, 2018
Published in print: Jan 1, 2019
Discussion open until: Apr 12, 2019
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