Iowa DOT Research Solutions_Quarry Fines for Unpaved Roads_TR-747

(2022) Iowa DOT Research Solutions_Quarry Fines for Unpaved Roads_TR-747. Transportation, Department of

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Abstract

Iowa’s unpaved roads provide essential connectivity for rural and agricultural communities across the state. However, extreme temperature changes and heavy equipment can damage and erode the unbound aggregates on the roads’ surface, leading to potholes, ruts, and other problems. In the hunt for a cost-effective and environmentally sustainable solution, researchers found that combining the aggregates with quarry fines—the small particles that remain after the usable stones from a quarry have been extracted and crushed—can improve the roads’ performance and reduce the need for routine maintenance.