Evaluation of Moisture Susceptibility of High-Porosity ATPB Drainage Layer Materials Using Modified Dynamic Modulus Test
Publication: Journal of Materials in Civil Engineering
Volume 28, Issue 10
Abstract
Asphalt-treated permeable base (ATPB) mixtures have been widely applied for drainage layers in pavements to avoid moisture-induced problems in the United States. However, with frequent exposure to water, the ATPB drainage layer itself is at high risk of moisture damage. In this study, the dynamic modulus and phase angle are used as the indicators to evaluate the potential moisture-induced deterioration of typical ATPB materials adopted in Virginia and Oklahoma. The modified dynamic modulus test appropriate for testing drainage layer materials with moisture deterioration were determined and adopted. Comparisons between the dynamic modulus of the conditioned and unconditioned specimens primarily show that the moisture-induced dynamic modulus reduction tend to be larger as the voids in total mixture (VTM) increases, and the drainage layer materials may become more sensitive to VTM but less sensitive to temperature after being conditioned in moist environment. The investigation of phase angle ratio and storage modulus ratio further reveals that moisture conditioning also influences the viscoelastic characteristics of the ATPB materials especially at larger VTMs. In addition, corresponding field performance is also evaluated and found to be consistent with the laboratory-determined moisture resistance for the ATPB-VA mixture by far.
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Acknowledgments
Research present here was conducted as part of the Transportation Pooled Fund study TPF-5(229) program, funded by Virginia, Oklahoma, Wisconsin, and Idaho. The authors appreciate all the assistance provided by staffs at Virginia DOT, Oklahoma DOT, Wisconsin DOT, and Idaho Transportation Department.
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Published In
Journal of Materials in Civil Engineering
Volume 28 • Issue 10 • October 2016
Copyright
© 2016 American Society of Civil Engineers.
History
Received: Sep 14, 2015
Accepted: Jan 19, 2016
Published online: Apr 21, 2016
Discussion open until: Sep 21, 2016
Published in print: Oct 1, 2016
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