Warm Mix Asphalt

Warm-mix asphalt technologies allow the producers of asphalt pavement material to lower the temperatures at which the material is mixed and placed on the road. Reductions of 10 to 38 degrees Celsius have been documented. Such drastic reductions have the obvious benefits of cutting fuel consumption and decreasing the production of greenhouse gases. In addition, engineering benefits include better compaction of paving mix with less number of compactor applications, the ability to open the road to the traffic right after the construction, and extending the paving season by being able to pave at lower temperatures. The following table shows the temperatures measured from the HMA and WMA mixtures.

°C Process °C
155 Binder Temperature 135
165 Aggregate Temperature 135
160 Loading Temperature 130
145 Paver Temperature 115
135 Compaction Temperature 110

Temperature reading of 162.3 degrees Celsius from hot mix asphaltTemperature reading of 129.2 degrees Celsius from warm mix asphalt

Examples of Warm Mix Asphalt