From previous studies, aging process increases the stiffness of an asphalt mixture, while moisture damage exerts an opposing effect on mix stiffness. This subject matter has been the subject of investigation in a few literatures for hot mix asphalts (HMA). Table 1 summarized the methodologies used to evaluate the effects of aging and moisture conditioning on the laboratory properties of asphalt binders and mixtures. In this paper, the stiffness properties of WMA incorporating a chemical warm additive subjected to moisture conditioning and aging were investigated in terms of indirect tensile strength (ITS) tests.