Evaluation of Mechanical Properties of a New Warm-Mix Asphalt using Sylvaroad Additive

Warm mix asphalts (WMA) have been gradually becoming more popular in the roading industry owing to their benefits compared to traditional hot mix asphalts (HMA), such as lower energy consumption and lesser emissions. In this paper, the authors investigated the performance of two WMA mixtures, using Evotherm and Sylvaroad, and compared them with HMA. The experimental investigation includes moisture susceptibility, fatigue cracking, rutting resistance, and a semicircular bending test. The results showed that HMA displayed the highest resistance to rutting, followed by the Evotherm mixture. The sylvaroad mixture showed the highest resistance to fatigue failure. However, only Evotherm mixture in this study passed the moisture susceptibility test, with a tensile strength ratio (TSR) of 91%. Both HMA and Sylvaroad mixtures showed considerable stripping, with the most severe case belonged to Sylvaroad mixture. HMA showed the best in fracture resistance and a semi-circular bending test yielded tensile strength results in a similar trend with the indirect tensile strength method.