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Comparison of Moisture Susceptibility of Evotherm 3G Warm Mix Asphalt vs Hot Mix Asphalt

Asphalt stripping is a common form of distress caused by moisture that creates a loss of bond between the aggregate and binder. It is thought that the use of warm mix asphalt (WMA) technology could lead to increased moisture susceptibility if the free moisture present in the aggregates does not evaporate at the lower mixing temperatures. The purpose of this study is to evaluate the moisture susceptibility of WMA using Evotherm 3G on laboratory prepared and plant prepared mixes. The moisture damage potential was evaluated using the TSR (Tensile Strength Ratio), the static immersion test, MiST. (Moisture Induced Stress Tester) and HWTT (Hamburg Wheel Tacking Tester). Additionally, plant-prepared mixes were also assessed for TSR and rut depth. The results indicated that WMA provided adequate levels of resistance to moisture damage, reduced swelling and improved coating. Laboratory mixes showed reduced resistance to rutting, but rut depth of plant mixes was similar to that of hot mix asphalt.