Mechanistic-Empirical Analysis of Asphalt Dynamic Modulus for Rehabilitation Projects in Iran

Document Type : Regular Paper

Authors

1 Associate Professor, Faculty of Civil and Environmental Engineering, Tarbiat Modares University, Tehran, Iran

2 Faculty of Civil and Environmental Engineering, Tarbiat Modares University, Tehran, Iran

3 Technical and Soil Mechanics Laboratory, Tehran, Iran

Abstract

In the Mechanistic–Empirical Pavement Design Guide (MEPDG), dynamic modulus of asphalt mixes is used as one of the input parameters in pavement analysis and design. For in-service pavements, MEPDG method uses a combination of some field and laboratory tests for structural evaluation of asphalt layers in rehabilitation projects. In this study, ten new and rehabilitated in-service asphalt pavements with different physical characteristics were selected in provinces of Khuzestan and Kerman in the south of Iran. These provinces are known as hot climate areas and have severe climatic conditions. At each site, Falling Weight Deflectometer (FWD) testing was conducted and core samples were taken. These samples were extracted and mix volumetric properties and binder characteristics were determined. Results of these tests were used as input parameters in Witczak dynamic modulus prediction model for determination of MEPDG undamaged dynamic modulus master curves. Finally, the damaged (in-situ) dynamic modulus master curves were developed upon modifying the undamaged master curves with the damage factors determined from back calculation analysis of FWD data. It was found that with the above mechanistic-empirical procedure, it would be possible to successfully evaluate in-service asphalt layers located in severe climatic areas.

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[1]     AASHTO. (2011). “Standard method of test for determining dynamic modulus of hot-mix asphalt concrete mixtures”. AASHTO T 342-11, American Association of State Highway and Transportation Officials, Washington, D.C.
[2]     Andrei, D., Witczak, M.W. and Mirza, M.W. (1999). “Development of a revised predictive model for the dynamic (complex) modulus of asphalt mixtures”. Inter Team Technical Rep. prepared for the NCHRP 1-37A Project, Department of Civil Engineering, University of Maryland, College Park, MD.
[3]     Bari, J. and Witczak, M.W. (2006). “Development of a new revised version of the Witczak E* predictive model for hot mix asphalt mixtures”. Journal of Association of Asphalt Paving Technology, Vol. 75, pp. 381-417.
[4]     Christensen, D.W., Pellinen, T. and Bonaquist, R.F. (2003). “Hirsch model for estimating the modulus of asphalt concrete”. Journal of the Association of Asphalt Paving Technologists, Vol. 72, pp. 97-121.
[5]     ARA. (2004). “Guide for mechanistic-empirical design of new and rehabilitated pavement structures”. NCHRP 1-37A, National Cooperative Highway Research Program, Transportation Research Board, National Research Council, Washington, D.C.
[6]     Khattab, A.M., El-Badawy, S.M., Hazmi, A.A.A. Elmwafi, M. (2014). “Evaluation of Witczak E* predictive models for the implementation of AASHTOWare-Pavement ME Design in the Kingdom of Saudi Arabia”. Construction and Building Materials, 64(14), pp. 360–369. DOI: http://dx.doi.org/10.1016/j.conbuildmat.2014.04.066
[7]     Ceylan, H., Schwartz, C., Kim, S. and Gopalakrishnan, K. (2009). “Accuracy of predictive models for dynamic modulus of hot-mix asphalt”. Journal of Materials in Civil Engineering, 21(6), pp. 286-293. DOI: http://dx.doi.org/10.1061/(ASCE)0899-1561(2009)21:6(286)
[8]     Abdo, A.A., Bayomy, F., Nielsen, R., Weaver, T., Jung, S.J. and Santi, M.J. (2009). “Prediction of the dynamic modulus of Superpave mixes”. 8th International Conference on Bearing Capacity of Roads, Railways and Airfields, Champaign, Illinois, pp. 305-314. DOI: http://dx.doi.org/10.1201/9780203865286.ch33
[9]     Gedafa, D., Hossain, M., Romanoschi, S. and Gisi, A. (2010). “Field verification of Superpave dynamic modulus”. Journal of Materials in Civil Engineering, 22(5), pp. 485-494. DOI: http://dx.doi.org/10.1061/(ASCE)MT.1943-5533.0000048
[10]    Singh, D., Zaman, M., and Commuri, S. (2011). “Evaluation of measured and estimated dynamic moduli for selected asphalt mixes”. Journal of ASTM International, 8(9), pp. 1-19. DOI: http://dx.doi.org/10.1520/JAI103535
[11]    El-Badawy, S., Bayomy, F. and Awed, A. (2012). “Performance of MEPDG dynamic modulus predictive models for asphalt concrete mixtures: local calibration for Idaho”. Journal of Materials in Civil Engineering, 24(11), pp. 1412-1421. DOI: http://dx.doi.org/10.1061/(ASCE)MT.1943-5533.0000518
[12]    Yousefdoot, S., Vuong, B., Rickards, I., Armstrong, P. and Sullivan, B. (2013). “Evaluation of dynamic modulus predictive models for typical Australian asphalt mixes”. 15th International Flexible Pavements Conference, Brisbane, Queensland, Australia.
[13]    Loulizi, A., Flintsch, G.W. and McGhee, K. (2007). “Determination of the in-place hot-mix asphalt layer modulus for rehabilitation projects by a mechanistic-empirical procedure”. Transportation Research Record: Journal of the Transportation Research Board, No. 2037, Transportation Research Board of the National Academies, Washington, D.C., pp. 53-62. DOI: http://dx.doi.org/10.3141/2037-05
[14]    Seo, J., Kim, Y., Cho, J. and Jeong, S. (2013). “Estimation of in situ dynamic modulus by using MEPDG dynamic modulus and FWD data at different temperatures”. International Journal of Pavement Engineering, 14(4), pp. 343-353. DOI: http://dx.doi.org/10.1080/10298436.2012.664274
[15]    ASTM. (2009). “Standard viscosity-temperature chart for asphalts”. D2493/D2493M-09, West Conshohocken, PA. DOI: http://dx.doi.org/10.1520/D2493_D2493M-09
[16]    AASHTO. (1993). “AASHTO Guide for the design of pavement structures”. American Association of State Highway and Transportation Officials, Washington, D.C.
[17]    Stubstad, R., Baltzer, S., Lukanen, E.O. and Ertman-Larsen, H.J. (1994). “Prediction of AC Mat temperature for routine load/deflection measurements”. 4th International Conference on Bearing Capacity of Roads and Airfields, Minneapolis, Minnesota, pp. 401-412.
[18]    Dynatest International A/S. (2014). “ELMOD User’s manual (ELMOD5)”. Dynatest Engineering A/S, A/S Reg. No.63.866, Denmark.
[19]    Odemark, N. (1949). “Investigation as to the elastic properties of soils and design of pavements according to the theory of elasticity”. Statens Vaginstitute, Meddelande 77, Stockholm, Sweden.
[20]    Ullidtz, P. (1998). “Modeling flexible pavement response and performance”. Narayana Press, Gylling, Denmark.
[21]    Lytton, R.L., Germann, F.P., Chou, Y.J. and Stoffels, S.M. (1990). “Determining asphaltic concrete pavement structural properties by nondestructive testing”. National Cooperative Highway Research Program (NCHRP), Report 327, Transportation Research Board, Washington, D.C.