PROJECTS

176th Street Bridge Abutment

Puyallup, WA

  • Location
  • Puyallup, WA

Project Overview

The 176th Street bridge structure consists of precast pre-stressed concrete girders supported on cast in place concrete piers. The pier under evaluation is approximately 30ft high x 90ft wide, tapered from 5ft at the bottom to 2ft at the top. OAC Services, Inc. was retained by the concrete subcontractor to assess the substandard concrete pour areas at Pier 1, to produce an outline procedure for the repair of Pier 1 and to provide structural observation during the repair process.

After removing the formwork, the Pier 1 abutment wall was discovered to have unacceptable rock pockets and exposed reinforcing at the earth side of the horizontal construction joints. The contractor was in a need of an experienced concrete repair consultant to design the repairs and provide guidance through the repair process.

The challenges of the project were the massive extent of the poorly consolidated concrete, the tight construction schedule and the owner’s expectations for the repairs to meet the longevity intended in the original design. Based on our evaluation we concluded that it is necessary to repair all the areas with poor consolidated and cracked concrete in order to minimize the risk of possible water leakage through the pier wall, the potential for future corrosion of the reinforcing steel, and to provide for its structural integrity and the durability intended in the original design.

OAC ultimately recommended removal of all deficient concrete along the construction joints. Hydrodemolition was utilized at the earth side of the pier, while the localized deficient concrete at the front face of the wall was removed through conventional chipping methods. The leaking cold joints were epoxy injected and, and shotcrete was applied after mechanical anchor installation and careful surface preparation of the substrate. Bond test and NDT methods were utilized to evaluate the adequacy of the repairs.

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