FIELD IMPLEMENTATION OF WARM MIX ASPHALT USING DIFFERENT BINDERS

The objective of this paper is to present the results and observations obtained from the laboratory tests and field implementations of warm mix asphalt (WMA) formulated using different binders. Laboratory tests were performed using the WMA mixes and the conventional hot mix asphalt (HMA) as a reference prior to implementation at the sites. The WMA mixes were laid at 2 different locations (i.e. along a major road and in a road tunnel) in Singapore. The performance of the WMA mixes was assessed by conducting temperature measurements during laying operations and monitored through visual inspections and by measuring riding quality of the road in terms of International Roughness Index. From the laboratory results, it was observed that the WMA mixes provided similar results as compared with the conventional HMA. From the field implementations, it was noted that the WMA mixes produced similar workability as compared to HMA. In addition, it was observed that WMA can be compacted at the lower temperature of approximately 110 ˚C.