Gradation Evaluation of Asphalt Rubber Mixture with Warm-mix Additive

This paper addresses the effect of gradation on the high temperature performance and water stability of asphalt rubber mixture that contains Evotherm. The gradation of asphalt rubber mixtures was selected for the performance analysis of asphalt rubber mixture with warm-mix additive. The volumetric properties and performance of hot-mix and warm-mix asphalt rubber mixtures were investigated by Marshall Test, rutting test and freeze-thaw split test. The results indicated that the asphalt aggregate ratio played a critical role in determination of the feasibility of warm-mix process. The AR-AC-13 mixture was not suitable for warm-mix process due to the over high binder content. The warm-mix process was effective to improve the volumetric properties of AR-SMA mixture at lower mixing and compaction temperatures. The high temperature performance of AR-SMA mixture with Evotherm was ensured, while the water stability decreased somewhat.