Abstract
The dynamic modulus (|E*|) of hot-mix asphalt (HMA) is one of the fundamental inputs in the mechanistic-empirical (M-E) pavement design guide developed in NCHRP Project 1-37A. The M-E design guide provides three levels for |E*| input, which are related nominally to the reliability of pavement performance estimates generated by the guide. Level 1 |E*| inputs require laboratory-measured |E*| -values, and Level 2 and 3 |E*| inputs are estimated by using a predictive equation. To provide the laboratory-measured |E*| inputs for implementation of the M-E design guide, a comprehensive research effort was completed in Arkansas. The research included a study evaluating different |E*| testing protocols, derived by varying combinations of the number of test replicates and the number of measurement instruments affixed on each test specimen recommended in AASHTO TP 62-03. The testing protocols were evaluated in terms of the variability of the resulting |E*| test results. The total research effort included three replic...
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