01046269

Component

https://doi.org/10.3141/1991-10

http://scholar.google.com...bsen&publication_year=2007

This study determines the effectiveness of the electrochemical chloride extraction (ECE) method on a bridge deck with a high concentration of chloride. ECE was applied on a pedestrian bridge in Iowa to control and mitigate corrosion that occurred in the embedded reinforcing steel. First, chloride content was measured from the existing bridge deck; it ranged from 1.64 lbs/cy to 24.58 lbs/cy. ECE was applied to remove chloride from the bridge deck for 8 weeks. Afterward, chloride content was significantly reduced to 0.32 lb/cy and to 4.96 lb/cy. To simulate corrosion in the bridge deck, 2 reinforced slabs and 12 reinforced beams were prepared, cracked, and saturated with salt solution for 4 months, followed by ECE application. Initially, half-cell potentials were measured from test specimens; they all were below –200 mV; this indicated a 5% probability of corrosion. At introduction of 3% salt solution, the potential increased and remained at –500 mV for 4 months; this indicated 95% of corrosion. To remove chloride from test specimens, ECE was applied for 1.5 months. Afterward, average chloride content from the surface to 2 in. below the surface of test specimens with salt solution was significantly reduced from 10.68 lb/cy to 4.12 lb/cy, and half-cell potential decreased to below –200 mV. From limited laboratory test specimens, it can be concluded that the ECE method can effectively reduce corrosion activity by removing a significant amount of chloride.

01077199

English

pp 78-85

2007

Transportation Research Record: Journal of the Transportation Research Board

9780309104166

Print

Figures (6) ; Photos (6) ; References (16) ; Tables (3)

Beams; Bridge decks; Chlorides; Concrete; Corrosion; Electrochemical corrosion; Embedded systems; Field tests; Laboratory tests; Reinforcing bars; Specimens

Electrochemical chloride extraction; Reinforced concrete beams; Salt solution

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

TRIS, TRB

Feb 8 2007 8:05PM

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