Effect of SBS Polymer and Anti-stripping Agents on the Moisture Susceptibility of Hot and Warm Mix Asphalt Mixtures

The primary objective of this study is exploring the moisture susceptibility of unmodified and SBS-modified hot and warmmix asphalt mixtures. To this end, two different WMA additives including Aspha-min and Sasobit were employed tofabricate WMA specimens. The moisture susceptibility of warm polymer modified asphalt (WPMA) mixes was evaluatedusing modified Lottman test at 25°C according to AASHTO standard (T 283). In addition, the effect of differentpercentages of hydrated lime (from 0% to 2%) and Zycosoil (from 0% to 0.1%) as anti-stripping additives on the moisturesusceptibility of the mixtures was explored. Based on the ITS test results, WPMA prepared with Sasobit additive andpolymer modified asphalt (PMA) mixes satisfied the desirable tensile strength ratio (TSR) (above 80%) but Aspha-minWPMA mixes had TSR lower than 80%.

Keywords:

Warm Mix Asphalt , Polymer Modified Asphalt , Modified Lottman Test , Zycosoil , Hydrated