Viscoelastoplastic Continuum Damage Model Application to Thermal Cracking of Asphalt Concrete
Publication: Journal of Materials in Civil Engineering
Volume 17, Issue 4
Abstract
A viscoelastoplastic continuum damage (VEPCD) model has recently been developed and validated under the auspices of the National Cooperative Highway Research Program 9-19 project, entitled “Advanced Mixture Characterization for Superpave Support and Performance Models Management.” The VEPCD model is able to characterize the viscoelastic and viscoplastic responses of asphalt concrete (AC) in addition to microcracking. The primary objective of this paper is to validate the model under thermal loading conditions that are distinctively different from the mechanical loading conditions used in model development and calibration. Viscoplastic (VP) behavior is a typical response in AC at high temperatures; however, based on the superposition principle, it is the slow strain rate observed in thermal cracking that triggers the VP response. Measured responses and fracture parameters from thermal strain restrained specimen tensile (TSRST) strength tests were compared with those predicted using the VEPCD model, the viscoelastic continuum damage model, and the linear viscoelastic model. The comparison confirmed: (1) the ability of the VEPCD model to accurately characterize the tensile behavior of asphalt concrete under thermally induced loading; and (2) a decrease in accuracy as the complexity of the model decreases.
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Acknowledgments
This material is based upon work supported by the National Science Foundation (NSF) under Grant No. 9812741 and the NCHRP 9-19 project. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the writers and do not necessarily reflect the views of the NSF. The project is sponsored by the AASHTO, in cooperation with the FHWA, and was conducted under the NCHRP, which is administered by the Transportation Research Board of the National Research Council. The writers gratefully acknowledge this support.
References
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Information & Authors
Information
Published In
Journal of Materials in Civil Engineering
Volume 17 • Issue 4 • August 2005
Pages: 384 - 392
Copyright
© 2005 ASCE.
History
Received: Dec 8, 2003
Accepted: May 4, 2004
Published online: Aug 1, 2005
Published in print: Aug 2005
Notes
Note. Associate Editor: Mary Stroup-Gardiner
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