Systematic Evaluation of Fracture-Based Healing Indexes of Asphalt Mixtures
Publication: Journal of Materials in Civil Engineering
Volume 30, Issue 10
Abstract
The sensitivity of fracture-based healing indexes of asphalt mixtures was evaluated using a semicircular bending test following a multiple fracture-rehealing method. Five healing agents (HAs) were applied on the cracks to promote healing. Test results indicated that pre- and postpeak material fracture response properties recovered different values on healing. Prepeak fracture-based indexes such as peak healing index (PI), stiffness healing index (SI), and toughness healing index (TI) were insensitive to postpeak fracture properties, and they showed higher healing values as compared with the fracture energy healing index (EI). Nonetheless, EI, which represented the restored fracture energy on healing, was the most sensitive index to both pre- and postpeak fracture material properties. It could be considered a better index for evaluating the healing performance of asphalt mixtures.
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Acknowledgments
Financial support from the National Natural Science Foundation of China (No. U1733121) and the China Scholarship Council is acknowledged. The authors are grateful for the cooperation between the People’s Republic of China and the Government of Kenya and express their desire to see a prolonged and stronger cooperation between the two states.
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©2018 American Society of Civil Engineers.
History
Received: Dec 5, 2017
Accepted: Apr 25, 2018
Published online: Jul 24, 2018
Published in print: Oct 1, 2018
Discussion open until: Dec 24, 2018
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