EVALUATION OF WARM-MIX ASPHALT MIXTURES USING LEADCAP ADDITIVE

Abstract

Warm-mix asphalt (WMA) is an emerging technology that can allow asphalt to flow at a lower temperature for mixing, placing and compaction. This technology can reduce energy consumption during asphalt production and reduce carbon dioxide emission and asphalt oxidation as well as extend asphalt paving season and delivery distance under enhanced working environment at the field. In Korea, an innovative wax-based WMA additive, which is named low energy and low carbon-dioxide asphalt pavement (LEADCAP), was developed to reduce mixing and paving temperatures applied in asphalt paving process. Since the first field trial project using the LEADCAP WMA technology in 2008, many LEADCAP WMA field trial projects have successfully been completed in Europe, United States and Asia. In this paper, the LEADCAP WMA mixtures along with the control hot-mix asphalt (HMA) mixtures were evaluated with respect to their crack resistance and rutting resistance based on the dynamic modulus test and full-scale accelerated pavement test (FSAPT). With the limited data carried out, it is concluded that LEADCAP additive can be effectively applied to WMA mixtures and LEADCAP WMA pavement is expected to perform comparable to HMA pavement.