Pavement

This report reviewed various approaches to produce warm mix asphalt (WMA) and their laboratory and field assessments. Reviewed technologies are the foamed mix based products (Aspha-Min, WAM-Foam and LEA), organic additive products (Sasobit, Asphaltan B, CECABASE RT 92 and Licoment BS100) and finally emulsion based products (Evotherm and WAM-Emulsion).

The WMA products appeared to have many potential benefits. Although using WMA is likely to have higher initial construction cost at present, it appears to be a useful technology for the industry and worth further investigation. The lower production temperatures used in WMA processes may lead to increased moisture sensitivity issues for the mixes. Although many laboratory/field trials using some of the WMA products typically demonstrated positive outcomes, long term performance monitoring (along with better understanding on environmental and economic impacts) is essential to evaluate the true benefits/risks of the WMA products.