Research on Properties of Warm Mix Asphalt

Warm Mix Asphalt (WMA) is a technology that allows significant lowering of the production and paving temperature of conventional Hot Mix Asphalt (HMA). A laboratory study was conducted to evaluate two different WMA technologies – Sasobit and Rediset WMX. The testing consisted of two parts – determination of changes in rheological properties of bitumen at intermediate to high temperatures and mixture testing. The properties of bitumen were tested with traditional EN test methods and with the Dynamic Shear Rheometer (DSR). Testing of asphalt was performed for SMA mixture at four different temperatures. The compactibility characteristics, density, stiffness modulus and resistance to permanent deformations as a measure of Marshall test and dynamic creep were determined. The results show that it is possible to reduce the compaction temperature of 155oC for HMA to 125oC for WMA