Effect of chemical warm asphalt additive on the rheological properties of bituminous binders

Abstract

– In recent years, warm mix asphalt (WMA) mixtures started to be widely used to achieve energy savings, reduce emissions, and lower overall costs by decreasing production temperatures during mixing. The present study investigates the effects of the use of a chemical warm asphalt additive, PAV110 additive, at different ratios (1% and 1.5%) on the high-temperature rheological properties of both pure and SBS-modified (3%) binders by using the frequency sweep test. The frequency sweep test was conducted at temperatures of 40 °C, 50 °C, 60 °C, and 70 °C within the frequency range of 0.1-10 Hz. Given the results achieved, it was determined that the warm asphalt additive reduced the complex modulus values, increased the phase angle values of both pure and SBS-modified binders, and caused a more viscous behavior. Moreover, it is also believed that this might have reduced rutting resistance.