A new approach for the evaluation of time-temperature superposition effects on the self-healing of bituminous binders

摘要

The experimental work described in this paper investigated the coupled effects of rest time and rest perature on the self-healing potential of bituminous binders. A set of neat and polymer-modified materials were subjected to self-healing tests that included two oscillatory shear loading phases separated a single rest period. Multiple testing conditions were analyzed by combining various rest times and temperatures. Self-healing was quantitatively assessed by introducing two healing indices, based on magnitude of stiffness and fatigue endurance gain, in which time-dependent artefacts were properly quantified and removed. Experimental results were found to be consistent with the kinetics of healing phenomena and underscored the importance of considering rest time coupled with rest temperature for a reliable evaluation of true self-healing properties. A new model was proposed to describe self-healing performance of bituminous binders and self-healing charts were constructed from generalized logistic functions incorporating the effects of both rest time and temperature.(c) 2021 Elsevier Ltd. All rights reserved.