@article{safaei_lee_nascimento_hintz_kim_2014, title={Implications of warm-mix asphalt on long-term oxidative ageing and fatigue performance of asphalt binders and mixtures}, volume={15}, journal={Road Materials and Pavement Design}, author={Safaei, F. and Lee, J. S. and Nascimento, L. A. H. and Hintz, C. and Kim, Y. R.}, year={2014}, pages={45–61} }
 @article{lee_kim_2014, title={Performance-Based Moisture Susceptibility Evaluation of Warm-Mix Asphalt Concrete Through Laboratory Tests}, ISSN={["2169-4052"]}, DOI={10.3141/2446-03}, abstractNote={This study used the cyclic direct tension test, indirect tensile strength test, and Hamburg wheel tracking device (HWTD) test to evaluate the moisture susceptibility of warm-mix asphalt (WMA) mixtures. The stripped areas that were quantified by digital imaging analysis were derived from the cyclic direct tension, indirect tensile strength, and HWTD tests and were compared with the mechanical properties of the mixtures to identify sensitive moisture susceptibility indicators. These methods were applied to a Superpave® 9.5-mm hot-mix asphalt mixture and five corresponding WMA mixtures that used the following technologies: (a) Evotherm 3G that contained a chemical additive, (b) foaming, (c) WMA-A that contained a chemical additive and was under development, (d) WMA-B that contained an organic additive and was under development, and (e) WMA-C that also contained an organic additive (different from that used in WMA-B) and was under development. Fatigue life ratios obtained from the simplified viscoelastic continuum damage model combined with layered viscoelastic analyses were determined to be the most sensitive indicators for moisture susceptibility. The stripping infection points derived from the HWTD tests also showed good sensitivity to moisture conditioning; however, each stripping infection point was affected by the permanent deformation characteristics of a given mixture as well as its moisture susceptibility; therefore, the observation was inconclusive.}, number={2446}, journal={TRANSPORTATION RESEARCH RECORD}, author={Lee, Jong-Sub and Kim, Y. Richard}, year={2014}, pages={17–28} }
 @article{lee_lee_kwon_kim_2013, title={Use of Cyclic Direct Tension Tests and Digital Imaging Analysis to Evaluate Moisture Susceptibility of Warm-Mix Asphalt Concrete}, ISSN={["2169-4052"]}, DOI={10.3141/2372-08}, abstractNote={This paper presents a simplified viscoelastic continuum damage material model for the evaluation of moisture susceptibility of asphalt concrete. The model is based on cyclic direct tension testing and layered viscoelastic analysis. The visual stripping inspection afforded by digital imaging analysis is also proposed as an intuitive and straightforward method for moisture susceptibility evaluation. These methods were applied to a Superpave® 19-mm hot-mix asphalt mixture and corresponding warm-mix asphalt mixtures modified by a polyethylene wax-type additive with and without an antistripping agent. The fatigue life predicted by the simplified viscoelastic continuum damage and layered viscoelastic analysis models had a strong correlation with the percentage of stripping determined from specimen surfaces that were fractured during cyclic direct tension testing of the hot-mix and warm-mix asphalt mixtures with various asphalt contents. In addition, a polyethylene wax-type additive combined with an antistripping agent was found to provide a longer fatigue life and less stripping than a pure polyethylene wax-type additive. The findings from this paper should provide guidance to agencies and material engineers in developing asphalt binder modifiers that lengthen the fatigue life of pavements and reduce moisture susceptibility.}, number={2372}, journal={TRANSPORTATION RESEARCH RECORD}, author={Lee, Jong-Sub and Lee, Jae-Jun and Kwon, Soo-Ahn and Kim, Y. Richard}, year={2013}, pages={61–71} }