Fresh out of college in the 1990s, an asphalt producer hired me to develop RAP mix designs at a time when adding RAP to asphalt was a new concept. The plant manager explained that adding RAP into asphalt mixes was the ideal business model because it represented three distinct economic opportunities. First, the plant sells asphalt to a job site, then it is paid to take the asphalt back in the form of grindings, and finally, the plant is paid yet again when it resells the asphalt as RAP in a new mix. Although the plant manager was focused on the economic value of RAP to his plant, he was ultimately describing the importance of RAP to the sustainability of the asphalt paving industry.

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