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ELECTROCHEMICAL CHLORIDE EXTRACTION: INFLUENCE OF CONCRETE SURFACE ON TREATMENT.
| 题名： | ELECTROCHEMICAL CHLORIDE EXTRACTION: INFLUENCE OF CONCRETE SURFACE ON TREATMENT. |
| 作者： | Sharp-SR; Clemena-GG; Virmani-YP; Stoner-GE; Kelly-RG |
| 关键词： | Calcium-carbonate; Calcium-chloride; Cathodic-protection; Chlorides-; Deposition-; Efficiency-; Electrical-resistivity; Electrochemical-chloride-extraction; Electrochemical-processes; Rehabilitation-Maintenance; Reinforced-concrete-bridges; Surfaces-; Water-cement-ratio |
| 摘要： | One bridge restoration technique available for reducing corrosion-induced concrete deterioration, which removes chloride ions while simultaneously realkalizing the concrete adjacent to the steel is electrochemical chloride extraction (ECE). Studies have shown that ECE is capable of removing, in a single application, a significant portion of the chloride ions from a reinforced concrete structure. Prior research has also shown that the quantity of chloride ions removed is dependent on numerous factors including quantity and spacing of reinforcing steel, applied voltage, initial chloride concentration, etc. In addition, investigations into chloride binding and competition between other ions as current carriers have helped to clarify the probable mechanisms responsible for decreases in current efficiency with time during chloride removal. This portion of the investigation has focused on the influence of water-to-cement (w/c) ratio. In addition, an investigation was conducted to identify the cause of decrease in efficiency during chloride removal. A clear relationship between the w/c ratio and the chloride extraction rate was not evident. However, the investigation revealed that the resistance of the concrete surface layer increases considerably during ECE, which effectively restricts the current flow, while the resistance of the underlying layer of concrete either decreases or remains constant. It appears that the increased resistance of the surface layer concrete is accompanied by the formation of a tightly adhering residue on the concrete surface. Preliminary analysis of the surface formation indicates it contains calcium carbonate and calcium chloride. |
| 总页数： | 2002/10. pp49 (Phots., Figs., 16 Tab., 70 Ref.) |
| 报告类型： | 科技报告 |
相关文献
- EVALUATION OF ELECTROCHEMICAL CHLORIDE EXTRACTION (ECE) AND FIBER REINFORCED POLYMER (FRP) WRAP TECHNOLOGY.
- PILOT APPLICATIONS OF ELECTROCHEMICAL CHLORIDE EXTRACTION ON CONCRETE BRIDGE DECKS IN VIRGINIA.
- EVALUATION OF NORCURE PROCESS FOR ELECTOCHEMICAL CHLORIDE REMOVAL FROM STEEL-REINFORCED CONCRETE BRIDGE COMPONENTS.
- EFFECT OF ELECTROCHEMICAL CHLORIDE EXTRACTION ON CONCRETE PROPERTIES: INVESTIGATION OF FIELD CONCRETE.
- CONCRETE BRIDGE PROTECTION AND REHABILITATION: CHEMICAL AND PHYSICAL TECHNIQUES. FEASIBILITY STUDIES OF NEW REHABILITATION TECHNIQUES.
- Trial Application of Electrochemical Chloride Extraction on Concrete Bridge Components in Virginia
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