Environmental Considerations in the AASHTO Mechanistic-Empirical Pavement Design Guide: Impacts on Performance
Publication: Journal of Cold Regions Engineering
Volume 31, Issue 3
Abstract
This paper is a continuation of an earlier overview on the subject and presents the results of a sensitivity analysis that assessed the ability of the new design guide to portray the impact of temperature and moisture content on flexible pavement performance. The study used the most common asphalt concrete (HL3) and unbound materials (granular A and silty sand) used in Canada. Two binders [performance grade (PG) 52-34 and PG 58-28] and three moisture conditions (dry, wet, and optimum) were chosen. Designs performed using Level 3 analysis for unbound materials and Level 1 for asphalt concrete showed that the new design guide is sensitive to binder performance grades and climatic zones (cold versus warm); however, the new design guide showed limited sensitivity to the state of unbound materials: permanent deformation showed negligible changes between wet, dry, and optimum conditions. Model simulations indicated that rutting that accumulated throughout the 20-year design life for the warm region (Long Beach, California) was 50% more than that in the relatively cold region (New York). Using different soil conditions for unbound materials showed that the increase in resilient modulus from wet to dry conditions increases total rutting by 27%. Results also demonstrated good sensitivity to the type of asphalt binder and agreed with the binder type objective: the HL3 mix prepared with the PG 58-28 binder substantially decreased rutting (by 271%) compared with the mix prepared with the PG 52-34 binder.
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Acknowledgments
The author is grateful to the National Research Council Canada for their financial support and guidance to pursue this study. The author also wishes to express his appreciation to Dr. Morched Zegal, National Research Council of Canada, for his suggestions, support, encouragement, and guidance throughout the course of this work.
References
AASHTO. (1993). “AASHTO guide for design pavement structures.” Washington, DC.
AASHTO. (1997a). “Percent air voids in compacted dense and open bituminous paving mixtures.” AASHTO T269, Washington, DC.
AASHTO. (1997b). “Standard method of test for particle size analysis of soils.” AASHTO T88, Washington, DC.
AASHTO. (2000). “Standard practice for mixture conditioning of hot mix asphalt.” AASHTO PP2, Washington, DC.
AASHTO. (2003a). “Standard method of test for determining dynamic modulus of hot-mix asphalt concrete mixtures.” AASHTO TP62, Washington, DC.
AASHTO. (2003b). “Standard method of test for determining the creep compliance and strength of hot-mix asphalt using the indirect tensile test device.” AASHTO T322, Washington, DC.
AASHTO. (2003c). “Standard method of test for determining the resilient modulus of soils and aggregate materials.” AASHTO T307, Washington, DC.
AASHTO. (2010a). “Bulk specific gravity of bituminous paving mixtures using saturated surface dry specimens.” AASHTO T166, Washington, DC.
AASHTO. (2010b). “Moisture density relations of soils using a 2.5 kg rammer and a 305 mm drop.” AASHTO T99, Washington, DC.
AASHTO. (2010c). “Theoretical maximum specific gravity and density of bituminous paving mixture.” AASHTO T209, Washington, DC.
ASTM. (2005). “Test methods for liquid limit, plastic limit and plasticity index of soils.” ASTM D4318, West Conshohocken, PA.
Di Benedetto, H., and De La Roche, C. (1998). “State of the art on stiffness modulus and fatigue of bituminous mixtures.”, Taylor & Francis, London, 69–118.
Kim, J. R., Drescher, A., and Newcomb, D. E. (1997). “Rate sensitivity of asphalt concrete in triaxial compression.” J. Mater. Civ. Eng., 76–84.
Kim, Y. R., and Daniel, J. S. (1997). “Development of a mechanistic fatigue prediction model for aging asphalt-aggregate mixtures.”, Western Research Institute, Laramie, WY.
Lee, H. J. (1996). “Uniaxial constitutive modelling of asphalt concrete using viscoelasticity and continuum damage theory.” Ph.D. dissertation, North Carolina State Univ., Raleigh, NC.
Lee, H. J., and Kim, Y. R. (1998). “Viscoelastic constitutive model for asphalt concrete under cyclic loading.” J. Eng. Mech., 1224–1232.
Lu, Y., and Wright, P. (1998). “Numerical approach of visco-elasoplastic analysis for asphalt mixtures.” Comput. Struct., 69(2), 139–147.
MTO (Ministry of Transportation of Ontario). (2013). “Laboratory testing manual.”, Toronto.
NCHRP (National Cooperative Highway Research Program). (2004). “Guide for mechanistic-empirical design of new and rehabilitated pavement structures (MEPDG).”, Transportation Research Board, National Research Council, Washington, DC.
OPSS (Ontario Provincial Standard Specification). (2013). “Material specification for aggregate hot mix asphalt.” OPSS1003, ON, Canada.
Perl, M., Uzan, J., and Sides, A. (1983). “Viscoelastoplastic constitutive law for a bituminous mixture under repeated loading.” Transp. Res. Rec., 911, 20–27.
Schapery, R. A., and Park, S. W. (1999). “Methods of interconversion between linear viscoelastic material functions. Part II—An approximate analytical method.” Int. J. Solids Struct., 36(11), 1677–1699.
Sides, A., Uzan, J., and Perl, M. (1985). “A comprehensive viscoelastic-plastic characterization of sand-asphalt compressive and tensile cycling loading.” J. Test. Eval., 13(1), 49–59.
Uzan, J. (1996). “Asphalt concrete characterization for pavement performance prediction. Journal asphalt paving technology.” J. Asphalt Paving Tech., 65, 573–607.
Wright, P., and Zheng, L. (1994). “Visco-elasto-plastic behaviour of a hot rolled asphalt mixture under repeated loading and the effects of temperature.” Proc., 4th Int. Conf. on Bearing Capacity of Roads and Airfields, University of Minnesota Press, Minneapolis, 1035–1065.
Information & Authors
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Published In
Journal of Cold Regions Engineering
Volume 31 • Issue 3 • September 2017
Copyright
©2017 American Society of Civil Engineers.
History
Received: Mar 9, 2015
Accepted: Nov 10, 2016
Published ahead of print: Mar 2, 2017
Published online: Mar 3, 2017
Discussion open until: Aug 3, 2017
Published in print: Sep 1, 2017
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