@article{mun_chehab_kim_2007, title={Determination of time-domain viscoelastic functions using optimized interconversion techniques}, volume={8}, ISSN={["2164-7402"]}, DOI={10.3166/RMPD.8.351-365}, number={2}, journal={ROAD MATERIALS AND PAVEMENT DESIGN}, author={Mun, Sungho and Chehab, Ghassan R. and Kim, Y. Richard}, year={2007}, pages={351–365} }
 @article{chehab_kim_2005, title={Viscoelastoplastic continuum damage model application to thermal cracking of asphalt concrete}, volume={17}, DOI={10.1061/(ASCE)0899-1561(2005)17:4(384)}, abstractNote={A viscoelastoplastic continuum damage (VEPCD) model has recently been developed and validated under the auspices of the National Cooperative Highway Research Program 9-19 project, entitled “Advanced Mixture Characterization for Superpave Support and Performance Models Management.” The VEPCD model is able to characterize the viscoelastic and viscoplastic responses of asphalt concrete (AC) in addition to microcracking. The primary objective of this paper is to validate the model under thermal loading conditions that are distinctively different from the mechanical loading conditions used in model development and calibration. Viscoplastic (VP) behavior is a typical response in AC at high temperatures; however, based on the t-T superposition principle, it is the slow strain rate observed in thermal cracking that triggers the VP response. Measured responses and fracture parameters from thermal strain restrained specimen tensile (TSRST) strength tests were compared with those predicted using the VEPCD model, th...}, number={4}, journal={Journal of Materials in Civil Engineering}, author={Chehab, G. R. and Kim, Y. R.}, year={2005}, pages={384–392} }
 @article{chehab_e o'quinn_kim_2000, title={Specimen geometry tension test based study for direct on mechanical tests and air void variation in asphalt concrete specimens compacted by Superpave gyratory compactor}, ISBN={["0-309-06725-1"]}, ISSN={["0361-1981"]}, DOI={10.3141/1723-16}, abstractNote={ Reliable materials characterization and performance prediction testing of asphalt concrete requires specimens that can be treated as statistically homogeneous and representative of the material being tested. The objective of this study was to select a proper specimen geometry that could be used for uniaxial tensile testing. Selection was based on the variation of air void content along the height of specimens cut and cored from specimens compacted by the Superpave gyratory compactor (SGC) and on the representative behavior under mechanical testing. From measurement and comparison of air void contents in cut and cored specimens, it was observed for several geometries that sections at the top and bottom and those adjacent to the mold walls have a higher air void content than do those in the middle. It is thus imperative that test specimens be cut and cored from larger-size SGC specimens. Complex modulus and constant crosshead-rate monotonic tests were conducted for four geometries—75 × 115, 75 × 150, 100 × 150, and 100 × 200 mm—to study the effect of geometry boundary conditions on responses. On the basis of graphical and statistical analysis, it was determined that there was an effect on the dynamic modulus at certain frequencies but no effect on the phase angle. Except for 75 × 115 mm, all geometries behaved similarly under the monotonic test. From these findings and other considerations, it is recommended that the 75- × 150-mm geometry, which is more conservative, and the 100- × 150-mm geometry be used for tensile testing. }, number={1723}, journal={2000 TRB DISTINGUISHED LECTURE, PT 1 - ASPHALT MIXTURES 2000, PT 2}, author={Chehab, GR and E O'Quinn and Kim, YR}, year={2000}, pages={125–132} }