Daily Cycles of Temperature-Independent Curvature in Jointed Plain Concrete Pavements
Publication: Journal of Transportation Engineering, Part A: Systems
Volume 143, Issue 8
Abstract
Curvature due to temperature curling and moisture warping has a large effect on the performance and assessment of jointed plain concrete pavements (JPCP). Accurate curvature prediction can improve the design and evaluation of these structures. Daily changes in curvature are often assumed to be solely dependent on the temperature. However, data from instrumented slabs indicate that a hysteresis loop occurs on the equivalent linear temperature gradient (ELTG) versus curvature plot. A method is introduced to characterize the hysteresis loop by a characteristic height. This parameter is found to follow long-term and seasonal patterns. The characteristic height is correlated to the amplitude of the daily relative humidity cycle, indicating that the hysteresis loop may be affected by daily moisture movement within the slab. A method is introduced to identify the components of strain independent of temperature and restraint. These temperature-independent and restraint-independent strains are used to probe the long-term and seasonal changes in the hysteresis behavior.
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Acknowledgments
The authors would like to acknowledge Benjamin Worel, Thomas Burnham, Dave Van Deusen, Robert Strommen, and Trenton Prey at the Minnesota Department of Transportation for their assistance in providing vast quantities of MnROAD data.
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Published In
Journal of Transportation Engineering, Part A: Systems
Volume 143 • Issue 8 • August 2017
Copyright
©2017 American Society of Civil Engineers.
History
Received: Aug 11, 2015
Accepted: Nov 8, 2016
Published online: Mar 30, 2017
Published in print: Aug 1, 2017
Discussion open until: Aug 30, 2017
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