Analyzing the Damage–Healing Performance of Asphalt Mixture from Macroscopic and Mesoscopic Scales
Publication: Journal of Materials in Civil Engineering
Volume 35, Issue 7
Abstract
Owing to their self-healing ability, asphalt mixtures have great potential for improving the service life of asphalt pavement, and can play an important role in sustainable infrastructures. In this study, a semicircular bending damage-healing-fracture experiment was conducted to evaluate the healing effect of a 90# asphalt mixture and styrene-butadiene-styrene copolymer modified asphalt mixture. The digital image correlation technique was used to synchronously observe the semicircular specimen to analyze its surface displacement and strain changes during the healing process. The experimental results showed that, on the macroscopic scale, the healing index based on fracture energy density was recommended to evaluate the healing effect of asphalt mixtures, and the healing effect of the 90# asphalt mixture was better than that of the styrene-butadiene-styrene copolymer modified asphalt mixture. On the mesoscopic scale, the horizontal displacements of the notch of the specimen position gradually recovered under self-healing conditions. The strain concentration at the crack gradually weakened, and the strain degree in the non-cracked area of the specimen also decreased gradually under self-healing conditions. The recovery of the macromechanics of the specimen is related not only to the healing of the crack area but also to the recovery of the non-cracked area.
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Data Availability Statement
All of the data, models, and code generated or used during the study appear in the published article.
Acknowledgments
This research was financially supported by Basic Scientific Research Expenses Program of Universities directly under Inner Mongolia Autonomous Region (Grant No. JY20220297 and JY20220005) and National Natural Science Foundation of China (Grant No. 52168063).
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Published In
Journal of Materials in Civil Engineering
Volume 35 • Issue 7 • July 2023
Copyright
© 2023 American Society of Civil Engineers.
History
Received: May 17, 2022
Accepted: Nov 15, 2022
Published online: Apr 25, 2023
Published in print: Jul 1, 2023
Discussion open until: Sep 25, 2023
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