Asphalt and cement may be the last materials that spring to mind as green products, but participants in a Transportation Research Board conference are finding ways to retool old construction standbys. Warm mix asphalt at 250 degrees Fahrenheit releases less emissions than hot mix asphalt at 300 degrees Fahrenheit and uses up to 30% less fuel. Aggregate materials that do not pass inspection for premium concrete can be recycled as "econoconcrete," which can be used as a bottom layer for roads.

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