Waste Materials in Highway Construction by Vernon J. Marks, November 1990

(1990) Waste Materials in Highway Construction by Vernon J. Marks, November 1990. Natural Resources, Department of

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Abstract

Recycling of materials is an important part of Iowa DOT construction practices. It reduces the use of natural resources and eliminates large piles of pavement rubble. Recycling of asphalt concrete in Iowa began with a secondary project in 1975. The thrust of the early research was to produce high quality hot mix asphalt pavement while meeting air quality controls. Iowa was one of the first states (if not the first to meet all air quality requirements during a hot mix asphalt recycling project. By 1977, after three projects, recycling of hot mix asphalt concrete was established as a viable method of reconstruction, producing quality pavement without air pollution problems Today, almost all Iowa asphalt concrete pavement rubble is recycled into new asphalt concrete pavement.