The SHRP-LTPP Asphalt Resilient Modulus Pilot Study

by William O. Hadley, Texas Research and Development, Foundation, Austin, United States,
Jonathan L. Groeger, Texas Research and Development, Foundation, Austin, United States,



Document Type: Proceeding Paper

Part of: Materials: Performance and Prevention of Deficiencies and Failures

Abstract:

A SHRP asphalt concrete resilient modulus pilot study was initiated to provide important supplemental information related to the AC M_r program. Initially, sixty-three test sections were selected for potential use in the study and grouped based on moisture conditions (wet vs dry), temperature conditions (freeze vs. no-freeze), subgrade type (coarse vs. fine), and base thickness (low vs. high). Based on these factors, forty sections were chosen for testing. These test sections represent all four SHRP regions, including twenty-eight states and four Canadian Provinces. Approximately four hundred and eighty specimens will undergo a battery of standard SHRP tests including resilient modulus. The results of this pilot study will have a significant impact on the SHRP M_r protocol in the future. An overview of the test procedure and the analysis of data from five of the test sections is presented in this paper. This preliminary work established variations in modulus values for different test temperatures, varying rest periods, and tests along two different axes of the same sample. The pilot study testing program has yielded valuable results and insight for the resilient modulus test procedures of asphalt concrete and will procedures the impetus for moving the AC resilient modulus test procedures out of special university laboratory testing into mainstream production testing.

Subject Headings: Asphalt concrete | Resilient modulus | Infrastructure resilience | Asphalt pavements | Material tests | Laboratory tests | Temperature effects

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