Structure:	13 hammerhead piers, I-480 substructure
Location:	Omaha, Nebraska, USA
Project Date:	May 1998
Client:	Nebraska Department of Roads
Area Treated:	16,419 ft2 (1525 m2)
Contract Duration:	5 months
Contractor:	Vector Construction Inc.

Project Description:

In the summer of 1998, the Nebraska Department of Roads undertook a large rehabilitation project on Interstate Route 480 in downtown Omaha. This project consisted of re-decking approximately 0.6 miles of the westbound elevated expressway, along with rehabilitation of the substructure. The previous summer, Vector Construction Inc. had been responsible for conducting an investigation of the supporting piers for which several different repair options were presented to the Nebraska DOR. They considered options from Cathodic Protection systems to removal and replacement of the contaminated concrete. Finally the option of Electrochemical Chloride Extraction proved to be the more feasible option.

Conventional chip and patch repairs were performed on the delaminated areas of the "hammerhead" piers before installation was begun. The installation of the system on the 13 piers , hindered at times by the repair work performed by other contractors, took nearly 9 weeks. Because time permitted, the system was allowed to run for 8 weeks. The treatment proved to be greatly successful: 73.8% of the initial chlorides were removed from 0-1" (0-25mm) and 63.0% was removed from 2-3" (50-75mm). The performance of the Norcure® system impressed the Nebraska DOR enough that it has been included in plans for this coming summer's continued rehabilitation project of the Interstate Route 480.

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