Warm Mix Asphalt By: Pam McGowan

WMA Goals HMA quality Lower temperature Reduced emissions

How WMA Works Incorporates additives that reduce asphalt viscosity Reducing viscosity means mixing at lower temperatures

Types of Additives There are currently four types on the market –Aspha-Min –WAM-Foam –Sasobit –Evotherm

Aspha-Min WAM-Foam Product of Germany Synthetic zeolite crystals Internally held water creates foam Uses 2 binders Soft binder coats aggregate Water injected to create foam

Sasobit Evotherm Aliphatic hydrocarbon produced from coal gasification (long chain wax) Reduces rutting Chemical mixture Creates emulsion

Benefits to WMA Technology Reduction of fuel expenses with lower heat Increase in compaction results Shorter binder curing time Early site opening Reduction in emissions Tested and proven in Europe

Concerns with WMA Shorter aging time of asphalt could increase rutting potential Plant modifications may be necessary Additives may increase moisture susceptibility