Abstract
The adhesion between asphalt and aggregate directly affects the water damage resistance of asphalt mixtures. Water vapor is a prominent cause of water damage to asphalt mixtures, but the influence of water vapor on the adhesion performance of asphalt and aggregates is still unclear. To clarify the effect of moisture on adhesion, the surface energy parameters of three asphalt types and four aggregates under six relative humidity (RH) conditions from 0–100% were measured. Then, the adhesion energy between asphalt and aggregate under different RH conditions is calculated according to the surface energy theory. The results first show that both aged and virgin asphalt surface energy parameters do not change significantly with RH and curing time. Second, the surface energy parameters of aggregates decreasing relationship with RH. After RH increased from 0–100%, the total surface energy parameters of the four aggregates reduced by more than 60%, and the aggregate material showed high sensitivity to RH. Finally, when RH is greater than 80%, the rate of decrease in adhesion caused by water vapor was approximately equal to half of that of liquid water. This study shows that water vapor significantly influences the adhesion between asphalt and aggregate.
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Acknowledgements
The authors acknowledge the financial support of the National Natural Science Foundation of China (Project No. 51778514). Special thanks to the Innovation Demonstration Base of Ecological Environment Geotechnical and Ecological Restoration of Rivers and Lakes (No. 2020EJB004).
Funding
National Natural Science Foundation of China, 51778514, Rong Luo,the Innovation Demonstration Base of Ecological Environment Geotechnical and Ecological Restoration of Rivers and Lakes, 2020EJB004.
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Tu, C., Xi, L., Luo, R. et al. Effect of water vapor concentration on adhesion between asphalt and aggregate. Mater Struct 55, 237 (2022). https://doi.org/10.1617/s11527-022-02073-w
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DOI: https://doi.org/10.1617/s11527-022-02073-w