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ADOT Implements Composite in Bridge Project

Wednesday, August 14, 2019

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In order to replace the Interstate 40 bridge, located near the city of Winslow, Arizona, the state department of transportation used a method that alternates layers of granular fill bolstered with synthetic material.

According to the Arizona Department of Transportation (ADOT), this was the state agency’s first time using the method, known as a geosynthetic reinforced soil-integrated bridge system.

Bridge Replacement Work

ADOT, working in collaboration with the Federal Highway Administration (FHWA), is working to improve the Meteor City Road bridges, which includes replacing existing bridges and reconstructing roadway bridge approaches. Work began in mid-July on the bridge in question.

Arizona Department of Transportation

In order to replace the Interstate 40 bridge, located near the city of Winslow, Arizona, the state department of transportation used a method that alternates layers of granular fill bolstered with synthetic material.

The geosynthetic bridge method is being used to create abutments for an overpass. Collectively, the bridge replacement would have taken six months, but work will be able to wrap up in the fall.

Bridges built using this method reportedly have lower maintenance costs over the structure’s life span, and can also fit in more smoothly with roadway approaches. Work also includes the construction of a new bridge deck made from a polyester polymer concrete, a material that can cure in days rather than weeks. This kind of bridge deck is also known for having lower maintenance costs. This method also marks another first for both ADOT and the state.

According to FHWA, the geosynthetic reinforced soil-integrated bridge system can also help reduce construction cost. The technology is composed of three components: the reinforced soil foundation, the abutment and the integrated approach.

The alternating layers of granular fill and geosynthetic reinforcement, an internally stable composite, provide support and can carry significantly heavier bridge loads. A bridge built using this method can cost 25- 60% less than more conventional construction alternatives.

   

Tagged categories: Bridges; Construction; Infrastructure; NA; North America; Program/Project Management; Project Management; Rehabilitation/Repair

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