United States Department of Transportation
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Improved Prediction of Performance of Asphalt Mixes Using a Creep Constitutive Model
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2014-01-16
[PDF-9.87 MB]
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Edition:Final Report June 2012 – January 2014
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Abstract:This project investigated the application of the Brazilian indirect tension strength, constant mean stress, static triaxial compression, and static triaxial creep tests for testing asphalt mixes. Two different asphalt mixes, provided by the South Dakota Department of Transportation (SDDOT), were subjected to the laboratory testing program. Initially, the testing program was to provide the necessary data to conduct advanced viscoplastic modeling of asphalt pavement using finite element software. However, the time-dependent behavior of the asphalt mixes was more complex than anticipated and fitting of the creep test data to a constitutive model was not possible. Instead, the results of the testing program were used to demonstrate a qualitative approach to determine the potential performance of an asphalt mix. In addition, comparing the performance between the two asphalt mixes was accomplished. Recommendations are provided for conducting specific additional testing to further understand how such a program could be used to qualitatively predict asphalt pavement performance.
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