The Iowa Department of Transportation (DOT) has utilized the concrete overlay as a repair technique since the 1970s to extend the service life of bridge decks. Typically, a concrete deck overlay will extend the service life of a bridge by 15 to 20 years, however, as time passes, the overlays often become delaminated from the original deck at or near the bond interface leading to cracking and the intrusion of water and chloride ions, which accelerate the deterioration of the bridge.
To address this issue, the Iowa DOT developed a maintenance repair procedure that involves the injection of epoxy resin into the cracks and voids to bond the overlay to the original deck. The epoxy resin also serves as an agent to bond spalls and delaminated areas of the overlay together.
A research project was conducted jointly by the Bridge Engineering Center of the Institute for Transportation (InTrans), Iowa State University (ISU), and the Iowa DOT Office of Bridges and Structures to determine the additional service life of epoxy injected deck overlays and to identify the most effective methods, equipment, and materials. The results of the epoxy injection research concluded that additional service life can be achieved for bridge deck overlays by utilizing these epoxy injection repair procedures.
With the research completed and the procedures and specifications developed, the Iowa DOT would like to introduce this cost-effective bridge preservation technique to the local agencies. A workshop/webinar consisting of technical presentations and discussions will be held to introduce this technique and demonstrate the equipment on March 29th, 2018, at InTrans of ISU. Following this webinar, three field demonstrations will be held this summer to demonstrate the injection procedure.
|1:15 pm||Presentations and Discussions|
|2:15 pm||Equipment Demonstration|
If you have questions or need more information, please contact Keith Knapp, firstname.lastname@example.org, 515-294-8817.