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be better positioned within the concrete repair to protect it from shotcrete material applied under high pressures. This redesigned shape also makes it possible to increase the number of anodes within the concrete repair. Using these new techniques, there have been multiple projects where microsilica-enhanced shotcrete has been used with cathodic protection systems. All of the projects highlighted as follows were performed in Western Pennsylvania by Mosites Construction Company, based in Pittsburgh, PA. NEW YORK AVENUE BRIDGE This project involved the rehabilitation of a PENNDOT-owned 700 ft (210 m) long precast concrete I-beam ramp bridge carrying New York Avenue over Norfolk-Southern Railroad tracks and Harrison Street in Rochester, PA. The work included the rehabilitation of existing reinforced concrete piers using Quikrete Shotcrete MS with fibers, dry-process shotcrete placement, and incorporated cathodic protection (anodes) in the concrete repair patches. Vector Galvashield® anodes were encapsulated in non-shrink grout and shotcrete Repairs have been completed and the piers are ready for installation of the superstructure and deck in Rochester, PA Multiple bridge piers were repaired using shotcrete with cathodic protection was then placed over the anodes. In total, 250 ft3 (7 m3) of repairs were made. This project originally mandated formand pour concrete repairs, but Mosites Construction was able to show PENNDOT substantial savings by performing the concrete repairs with shotcrete and incorporating the cathodic protection as an additional means of corrosion protection. The pier repairs were part of a larger project lasting from September 2011 to December 2013. CAMPBELLS RUN ROAD BRIDGE, SR 376 Repairs were performed to rehabilitate substantial deterioration to the concrete substructure of this PENNDOTowned 120 ft (37 m) long steel I-beam bridge carrying I-376 over Campbells Run Road in Pittsburgh, PA. The work was performed using Quikrete Shotcrete MS with fibers and dry-process shotcrete placement. In addition to the shotcrete, Vector Galvashield anodes encapsulated in non-shrink grout were used in the concrete repair patches. In total, 650 ft3 (17 m3) of repairs were placed between March 2011 and December 2011. Once again, the project originally mandated form-and-pour concrete repairs but Mosites Construction was able to show PENNDOT substantial savings by converting the repair to shotcrete with the added use of cathodic protection. HOMEVILLE VIADUCT REHABILITATION This project involved the rehabilitation of an Allegheny County Department of Public Works-owned 800 ft (240 m) Material being pre-dampened and gunned onto a cap beam on a bridge in West Mifflin, PA www.shotcrete.org Summer 2017 | Shotcrete 21


2017SummerShotcreteEMag
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