Evaluation of Healing Potential in Unmodified and SBS-Modified Asphalt Mixtures Using a Dissipated-Energy Approach
Publication: Journal of Materials in Civil Engineering
Volume 27, Issue 12
Abstract
In this study, the ratio of dissipated-energy change (RDEC), developed based on the fundamental concept of energy, was used to investigate the healing potential of dense-graded asphalt mixtures having different types of asphalt binder. For this purpose, cylindrical asphalt mixture specimens were prepared using the calcareous-type crushed-stone aggregates. In addition, and penetration asphalt binders and penetration asphalt binder modified with styrene–butadiene–styrene (SBS) polymer modifier were used for the specimen fabrication. Subsequently, displacement/strain-controlled uniaxial fatigue tests were carried out on the specimens at various rest times, different strain amplitudes, and a single temperature, with three replicate specimens for each experimental combination. The healing index obtained by the RDEC approach was used to study the effects of different variables on the healing potential of asphalt mixtures. To evaluate the healing potential of asphalt mixes during the rest periods (RPs) having nonzero tensile strains, a special loading pattern was designed. Based on the test results, it was found that the microcracks may also be healed even under the prescribed condition. However, this healing potential, which is less than that obtained for the case of RPs having zero strain, has a decreasing rate with the increase of strain value during the rest times. Moreover, it was found that the effect of SBS polymer modifier on healing potential of asphalt mixes depends on the selected loading pattern.
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Published In
Journal of Materials in Civil Engineering
Volume 27 • Issue 12 • December 2015
Copyright
© 2015 American Society of Civil Engineers.
History
Received: Dec 24, 2013
Accepted: Mar 3, 2015
Published online: May 11, 2015
Discussion open until: Oct 11, 2015
Published in print: Dec 1, 2015
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