Journal article
Electrochemical Chloride Extraction Method to Control and Mitigate Corrosion in Rebar Embedded in Concrete: Laboratory Testing and Field Evaluation
Transportation research record, Vol.1991(1), pp.78-85
01/2007
DOI: 10.3141/1991-10
Abstract
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 lbs/cy to 4.12 lbs/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.
Details
- Title: Subtitle
- Electrochemical Chloride Extraction Method to Control and Mitigate Corrosion in Rebar Embedded in Concrete: Laboratory Testing and Field Evaluation
- Creators
- Jungyong Kim - NNW, Inc., 506 East College Street, Iowa City, IA 52242Hosin Lee - Public Policy Center, Department of Civil and Environmental Engineering, University of Iowa, Iowa City, IA 52242Rosanne Edwards - NNW, Inc., 506 East College Street, Iowa City, IA 52242Steve K Jacobsen - NNW, Inc., 506 East College Street, Iowa City, IA 52242
- Resource Type
- Journal article
- Publication Details
- Transportation research record, Vol.1991(1), pp.78-85
- DOI
- 10.3141/1991-10
- NLM abbreviation
- Transp Res Rec
- ISSN
- 0361-1981
- eISSN
- 2169-4052
- Publisher
- Transportation Research Board
- Language
- English
- Date published
- 01/2007
- Academic Unit
- Civil and Environmental Engineering; International Programs
- Record Identifier
- 9983991945902771
Metrics
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