When officials at Moody Air Force Base, near Valdosta, Ga., decided to rehabilitate and extend a runway used for heavy cargo planes, they specified concrete pavement and used some innovative strategies to reduce construction time. In addition to saving time, rehabilitating the runway saved the Air Force more than $4 million over the cost of rebuilding the runway completely.

The project, which began in January 1997, involved a 9,300-foot-long outer runway, one of two runways at the air base. The U.S. Army Corps of Engineers evaluated each section of the project and recommended either resurfacing or recon-struction, depending on the condition of the existing pavement. However, most of the runway (6,000 linear feet) was resurfaced using 9- to 11-1/2-inch thick whitetopping over the existing asphalt pavement. The contractor slipformed the 150-foot-wide overlay in four 30-foot-wide passes and two 15-foot-wide outside passes. On average, more than 2,000 cubic yards of overlay concrete were placed daily.