2002•Roads & bridges/Roads & bridges (Des Plaines, Ill. Online)Requires access
IOWA'S PLAYING FIELD : STATE PAVING REMAINS HIGHLY COMPETITIVE, ASPHALT SIDE WINS SECOND SHELDON G. HAYES AWARD IN FOUR YEARS
Bill L. Wilson
Open publisher page 0 citations
Abstract
The contractor on an asphalt paving job in Iowa that won the Sheldon G. Hayes award worked with the state's Quality Management Asphalt program (QMA) to design a mix suited for the 6.5 miles of rural and urban pavement that needed work. QMA requires contractors to conduct on-site testing of asphalt mix and encourages state officials and contractors to modify designs to fit specific needs. Both rural and urban parts of the job used 10.5 inches of pavement, with rolled stone base for the rural section and full-depth treatment with four different lifts in the urban portion. The mix was re-designed in certain stretches to make better use of local materials. A total of 51,700 tons of asphalt was used, and the average road density achieved was 97.4%, better than the required 94%.