The Suitability of Warm Mix Asphalt for Use in North Dakota

Abstract

Compared to hot mix asphalt (HMA), warm mix asphalt (WMA) offers several potential benefits, including reduced fossil fuel use and increased workability. The research presented in this paper examined the suitability of WMA for use in North Dakota, through review of previous research and experiences of North Dakota and other states, including those with similar weather to North Dakota. This review suggested that North Dakota and its neighboring states are looking to similar types of WMA to suit their varying needs. While more than one type of WMA may be suitable for use in North Dakota's climate, there could be some types that work better than others depending on aggregate sources, traffic volume and loads, and overlay versus new construction. North Dakota should continue to try various types of WMA and determine which additives or processes work best in the areas of the state's greatest need.