Evaluation of Marshall Properties of Warm Mix Asphalt using Sasobit

With increasing concerns of global warming and increasing exhaustion of greenhouse gases, the asphalt industry is looking for alternatives for hot mix asphalt (HMA).Warm Mix Asphalt (WMA) is a fast emerging new technology which has a potential of revolutionizing the production of asphalt mixtures. WMA technology allows the mixing, lay down and compaction of asphalt mixes at significantly lower temperatures compared to Hot Mix Asphalt (HMA). The technology can reduce production temperatures by as much as 30 percent. Asphalt mixes are generally produced at 150º C or greater temperatures depending mainly on the type of binder used. WMA mixes can be produced at temperatures of about 120ºC or lower. In this study an attempt has been made to compare HMA and WMA with organic additive (Sasobit) with various dosages on the Marshall properties for Dense Bituminous Macadam(DBM) Grade 2. The adopted mixing temperatures for HMA was 155°C,130°C and 115°C and the mixing temperatures for WMA was 130°C and 115°C. The laboratory study concludes that Stability & Marshall properties were improved for the WMA mix by the addition of the additive.