Slab-Base Interface Friction Evaluation for Continuously Reinforced Concrete Pavement
Publication: Journal of Transportation Engineering, Part B: Pavements
Volume 148, Issue 1
Abstract
The frictional characteristics at the slab-base interface are known to contribute to the development of the cracking pattern in continuously reinforced concrete pavement (CRCP) and also to its long-term performance. The backcalculation of the effective slab thickness from falling weight deflectometer (FWD) data can provide an efficient method for evaluating the degree of slab-base friction in CRCP. A direct method for the assessment of slab-base interface friction coefficient using FWD data is presented, which extends a simplified friction model for jointed concrete pavements and evaluates for several base types, effect on friction coefficient over time, and temperature dependency. One field project containing either microsurfacing or an asphalt concrete interlayer on top of a cement-treated base (CTB) enhanced the frictional resistance as measured by a greater effective thickness and increased coefficient of friction. Temperature impacted the backcalculated coefficient of friction when asphalt was present. The backcalculation process was also applied to assess the slab-base interface condition over time for an interstate CRCP test section with a mix-in-place CTB. For this project, the CRCP and CTB interface had a relatively low coefficient of friction but demonstrated stable friction and excellent performance in terms of smoothness and punchouts over the 11-year testing period.
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Data Availability Statement
Some or all data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request (original FWD data).
Acknowledgments
This publication is based on results of Illinois State Toll Highway Authority Project RR-14-9168, Natural Science Foundation of Jiangsu Province BK20190604, Jiangsu Planned Projects for Postdoctoral Research Funds 2020Z327, and Key Laboratory of Road and Traffic Engineering of the Ministry of Education, Tongji University K202002. The authors would like to acknowledge the support of Steve Gillen formerly of the Illinois State Toll Highway Authority and Dan Gancarz of Applied Research Associates. The contents of this paper reflect the view of the authors, who are responsible for the facts and accuracy of the data presented herein.
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Published In
Journal of Transportation Engineering, Part B: Pavements
Volume 148 • Issue 1 • March 2022
Copyright
© 2021 American Society of Civil Engineers.
History
Received: Jun 29, 2020
Accepted: Nov 8, 2021
Published online: Dec 24, 2021
Published in print: Mar 1, 2022
Discussion open until: May 24, 2022
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