Effect of Steric Hardening on the Damage Recovery of Bitumen
Publication: Journal of Materials in Civil Engineering
Volume 34, Issue 9
Abstract
Bituminous mixtures recover from fracture damage during rest periods and at high service temperatures due to their self-healing ability. Steric hardening of binders is a time-dependent phenomenon whose effect on the mechanical properties is similar to that of healing. Most of the healing evaluation methods used by different researchers do not consider the effect of steric hardening while explaining the effect of healing in the mixes. Hence, an attempt was made in the present study to quantify the contribution of steric hardening to the healing of bitumen. A multistage procedure was employed to separate the effect of steric hardening from the healing effect. In the steric hardening test, the bitumen sample was given a prolonged rest to evaluate the increase in the modulus value due to steric hardening. A storage recuperation test was carried out to quantify the combined effect of self-healing and steric hardening. The true healing potential of the binders was estimated by eliminating the effect of steric hardening from total recovery occurring during the rest period. Steric hardening was observed to be more in stiffer binders and at lower test temperature. Softer binders had more self-healing potential than stiffer binders. It was observed that the effect of steric hardening dictated the trends of total recovery, indicating that its contribution is significant. Thus, neglecting the effect of steric hardening while estimating the true healing potential of bitumen leads to inaccurate estimation and interpretation of healing results.
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Data Availability Statement
All data, models, and code generated or used during the study appear in the published article.
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Information & Authors
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Published In
Journal of Materials in Civil Engineering
Volume 34 • Issue 9 • September 2022
Copyright
© 2022 American Society of Civil Engineers.
History
Received: Aug 30, 2021
Accepted: Jan 14, 2022
Published online: Jun 27, 2022
Published in print: Sep 1, 2022
Discussion open until: Nov 27, 2022
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