Effect of a Sand Mix Interlayer on Thermal Cracking in Overlays
Publication: Journal of Materials in Civil Engineering
Volume 26, Issue 9
Abstract
Sand mix interlayers are one of the most widely used stress-absorbing types of interlayers employed for concrete overlays and concrete bridge decks. Most of the available research focuses on the function of sand mix interlayers in terms of mechanics and ignores their ability to mitigate thermal cracking, which is one of the main distresses in pavements. To address this deficiency in the current body of literature, this study analyzes the effect of a sand mix interlayer on thermal cracking in overlays. This research examines the asphalt mixture, sand mix and concrete materials in terms of their contraction performance. The stress and strain states of the structures with and without a sand mix interlayer are determined using a strain gauge and are simulated using ABAQUS. The results show that after adding a sand mix layer, the stress state of the asphalt mixture is much closer to its stress state without any constraint. The inclusion of the sand mix layer decreases the tension stress at the bottom of the asphalt layer, so that the distance between thermal cracks is allowed to increase and the number of thermal cracks decreases, which is good for the layered structure.
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Acknowledgments
This study is supported by the China Postdoctoral Science Foundation (2013M531050), the Fundamental Research Funds for the Central Universities (Grant No. HIT. NSRIF. 2014081), and the National Natural Science Foundation of China (51108138 and 51310105005).
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© 2014 American Society of Civil Engineers.
History
Received: Dec 4, 2012
Accepted: Sep 16, 2013
Published online: Sep 18, 2013
Published in print: Sep 1, 2014
Discussion open until: Oct 12, 2014
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