NAPA National Asphalt Pavement Association

MultiCool Aids Compaction Calculations in the Field

The MultiCool asphalt paving cooling prediction tool has been updated to make time-to-compaction calculations in the field easier. Depending upon mix temperature and air temperature, the time a roller operator has to achieve the desired density can vary significantly from day to day or job to job. MultiCool software was developed to help accurately predict asphalt pavement cooling time.

MultiCool V2.0 was developed by Dr. David Timm and Ben Peters of Auburn University with funding from the National Asphalt Pavement Association. It can be downloaded for Android devices through the Google Play app store or visit goaspha.lt/multicoolv2 to access the desktop or mobile Web version.

MultiCool calculates the rate of cooling for an asphalt mat during construction. Time, date, location, and weather information can be calculated automatically and the user need only add details about the mixture and the surface it is being placed atop. The program then returns a chart showing how quickly each lift will cool and when the next lift can be placed. This cooling rate prediction can help contractors better plan rolling operations to more efficiently achieve target mat density, as well as the timing of delivery of asphalt mixtures to the paving site.

MultiCool has been validated in cold (Minnesota) and warm (California and Alabama) climates for typical Superpave mixtures, stone matrix asphalt (SMA) mixes, warm-mix asphalt (WMA), reclaimed asphalt pavement (RAP), reclaimed asphalt shingle (RAS), and ground tire rubber (GTR) mixtures.

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