Evaluation of the Variability of |E*| with Field Procured Hot Mix Asphalt Concrete Mixtures

ABSTRACT The dynamic complex modulus test is quickly coming into the mainstream of practice for research purposes and implementation by owner/agencies. Past research projects have developed estimated limits of accuracy for laboratory mixed/laboratory compacted specimens, however there is little information for field mixed/laboratory compacted specimens. The dynamic complex modulus test was conducted on each of 17 field mixed/laboratory compacted mixtures with various volumetric properties and three replicate specimens to evaluate test variability. Included were factors believed to affect the results and variability of the dynamic modulus test. Statistical analysis was performed to determine the significance of the factors. The results of the analysis showed that three main factors were significant contributors to the variability of the dynamic complex modulus test results (nominal maximum aggregate size, test temperature, and binder grade). Six factors were checked and validated to be the main contributors in the dynamic modulus values (air voids, asphalt content, frequency, temperature, use of recycled asphalt pavement, and binder grade).