01365733

Component

This research focuses on the selection of suitable parameters for evaluating a bridge deck deterioration model, based on the diffusion of chlorides to initiate corrosion and subsequent cracking and spalling, for a deck with epoxy-coated steel bars as reinforcement. Another objective of this study is to attempt interpretation of the copper-copper sulfate (CSE) half-cell potentials and unguarded three linear polarization (3LP) corrosion rates, where these tests supply significant indication of ongoing corrosion, for the bridge decks with epoxy-coated reinforcement (ECR) steel bars. The study includes the inspection of a bridge deck (Federal Structure Number: 14178), which carries U.S. Route 15 over Interstate 66 near Gainesville, Virginia. The bridge was constructed in 1979 with a top mat of ECR and uncoated steel bars (UCS) as the bottom mat. At the time of the inspection the bridge had been 30 years in service, had not been overlaid, and exhibited prominent surface deterioration. Cumulative damage was 14% of the deck surface area as the sum of the spalls, delaminations and patches. This study also considers the number of samples or observations for each parameter considered necessary to run a model with a statistical significance of 95%. Using selected parameters the diffusion model is applied for the bridge deck to estimate future deterioration rate, which predicts severe damage in a short period of time.

This paper was sponsored by TRB committee AHD45 Corrosion

01362476

12-2496

English

14p

2012

Transportation Research Board 91st Annual Meeting

Digital/other

Figures; References; Tables

Bridge decks; Computer models; Deterioration by environmental action; Epoxy coatings; Inspection

Gainesville (Virginia)

Bridges and other structures; Highways; Maintenance and Preservation; Planning and Forecasting; I24: Design of Bridges and Retaining Walls; I60: Maintenance

Transportation Research Board Annual Meeting 2012 Paper #12-2496

TRIS, TRB

Feb 8 2012 5:10PM