DelDOT Program to Replace Corrugated Metal Pipes with RCP Alternative

By Jason Hastings, Bridge Design Engineer
Delaware Department of Transportation

Since the early 2000s, the Delaware Department of Transportation (DelDOT) has been focused on replacing aging and corroding corrugated metal pipe culverts throughout the state. DelDOT defines a state-length bridge as a structure with a hydraulic opening greater than 20 square feet. The federal definition of a bridge is a structure over 20 feet in length measured along the centerline of the roadway. Delaware’s bridge inventory consists of over 1,600 federal and state-length bridges. Approximately 50% are culverts.

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09Nov 2015

This is a demonstration of the comparative flammability of polypropylene pipe (PP), reinforced concrete pipe (RCP), and high density polyethylene pipe (HDPE). Dry hay is ignited in three 18 in. by 18 in. pipes and allowed to burn. This is an unedited test conducted on October 21, 2015.