Journal of Testing and Evaluation Zhaoxing Xie, 1,2 Junan Shen, 1,2 Wenzhong Fan, 3 and Lili Wang 3 DOI: 10.1520/JTE20130255 Laboratory Investigation of the Effect of Warm Mix Asphalt (WMA) Additives on the Properties of WMA Used in China VOL. 42 / NO. 5 / SEPTEMBER 2014