Assessment of Rutting Behavior of Warm-Mix Asphalt (WMA) with Chemical WMA Additives towards Laboratory and Field Investigation

摘要

Lower production temperature and less aging make warm-mix asphalt (WMA) more prone to rutting. This study assessed rutting characteristics of WMA with chemical additives through laboratory experimentation and non-destructive field evaluation. To facilitate the study, three WMA mixtures and one control hot-mix asphalt (HMA) have been experimented. One of the WMA mixtures contained polymer modified binder. Hamburg wheel tracking (HWT) test has been conducted for laboratory experimentation. A recently developed method of HWT test analysis has been applied. Nondestructive field strength evaluation and automated pavement distress survey tools were utilized for field evaluation. It is found that chemical WMA exhibits equivalent or better rutting behavior compared to a HMA with a same binder and aggregate structure. Incorporation of polymer modifier in chemical WMA additives resulted in improved rutting characteristics and field strength.