Relationship between Air Voids and Permeability: Effect on Water Scouring Resistance in HMA
Publication: Journal of Materials in Civil Engineering
Volume 33, Issue 4
Abstract
This study explored the relationship between air voids and permeability, and investigated the correlation between air void type, coefficient of permeability, mechanical properties, and moisture damage in hot-mix asphalt (HMA). Six asphalt mixtures were prepared with air voids ranging from 4% to 19% in increments of 3%. Major tests, including two air void tests, a penetration test, and a dynamic water scouring test, were conducted to assess the moisture damage by measuring and comparing the difference in air voids and permeability before and after the dynamic water scouring. A compressive test was conducted to evaluate the residual strength of HMA with different porosities. Results indicated that the effective voids and coefficient of permeability had a strong correlation. There was an obvious increase of effective voids and permeability for specimens with air voids from 10% to 13% after dynamic water scouring tests. In terms of compressive strength, specimens with air voids from 7% to 13% had greater strength loss and deformation than other specimens, indicating that moisture damage occurred and developed rapidly in asphalt mixtures within a certain porosity range.
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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.
Acknowledgments
This study was supported by Natural Science Foundation of China (No. 51178085). The authors declare no conflict of interest regarding the publication of this manuscript.
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Published In
Journal of Materials in Civil Engineering
Volume 33 • Issue 4 • April 2021
Copyright
© 2021 American Society of Civil Engineers.
History
Received: Apr 13, 2020
Accepted: Aug 31, 2020
Published online: Jan 22, 2021
Published in print: Apr 1, 2021
Discussion open until: Jun 22, 2021
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