THE CONCRETE BRIDGE MAGAZINE

SPRING 2008

ASPIRE is a quarterly magazine published by PCI in cooperation with the associations of the National Concrete Bridge Council. The editorial content focuses on the latest technology and key issues in the Concrete Bridge Industry.

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Protecting Against by Craig A. Shutt Concrete can help bridges resist a blaze's high heat and return quickly to service On June 20, 2007, a fuel tanker truck rear-ended a loaded dump truck on State Route 386 under the Stop Thirty Road Bridge north of Nashville, Tennessee. The tanker erupted into flames beneath the 233-ft-long structure, a two-span, two- cell, hollow box-beam bridge. Fearing damage that would interrupt traffic for many months, both on and below the bridge, inspectors, and maintenance crews rushed to the site to conduct studies on the concrete once the fire cooled. After analyzing the bridge and finding no problems, traffic was restored under the bridge to the busy state route as soon as pavement repairs were completed. Traffic returned to service on Stop Thirty Road after core samples were evaluated. "The analysis showed that the bridge endured much heat but sustained very little damage," says Wayne Seger of the Office of Bridge Inspection and Repair at the Tennessee Department of Transportation. The affected span was 120-ft long. The bottom slabs of the hollow box-beams are 7.25-in. t h i c k , a n d t h e s i d e s o f t h e b o x sections along with the common wall between the cells are 1-ft thick with two mats of reinforcement. Class A, 3000 psi concrete and epoxy-coated 'The analysis showed that the bridge endured much heat but sustained very little damage.' 18 | ASPIRE , Spring 2008 ASPIRE_spring08.indb 18 3/24/08 1:32:34 PM

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