Dive Brief:

• The New Hope-Lambertville toll bridge over the Delaware River between New Jersey and Pennsylvania was repaved using a technique never before tried in the region and for which neither state has existing standards.
• Foamed asphalt uses a single-train process in which existing surface is excavated, fed into a following pulverizing machine, mixed with asphalt, injected with water to expand its volume and laid in place at the back end.
• Cherry, Weber & Associates gathered information from the Alaska and California DOT's to write the specifications for the job and estimates that the Delaware River Joint Toll Bridge Commission saved 60% on paving costs and 30% on the overall repair project.

Dive Insight:

Foamed asphalt had a "people" saving in addition to the financial advantage. "New Hope is a very tourist friendly area," Greg Bitsko PE, senior director of structural engineering at Cherry, Weber & Associates, said. "Work was being done during the summer, the peak of their busy season. We knew this method would reduce truck traffic significantly."