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00821 FIELD EXPERIENCE AND LONG TERM MONITORING OF SOME REINFORCED CONCRETE BRIDGE STRUCTURES SUBJECTED TO ELECTROCHEMICAL CHORIDE EXTRACTION (ECE)

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Product Number: 51300-00821-SG
ISBN: 00821 2000 CP
Author: Donald R. Jackson, Moavin Islam
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Electrochemical chloride extraction (ECE) is a process that is becoming increasingly popular as a viable rehabilitation option to stop on-going corrosion of the embedded steel in chloride contaminated reinforced concrete structures. ECE is accomplished by applying an electric field between a temporary external anode and the reinforcing steel (the cathode) which causes the migration of negatively charged chloride ions in the concrete away from the steel towards the positively charged anode. Since the early 1990's hundreds of reinforced concrete structures worldwide, including the USA and Canada, have been treated with ECE. Majority of these structures in the USA has been installed through funding from the Federal Highway Administration. The performance of four of these structures has been monitored over the period 1995-1998. The present paper discusses the long-term monitoring results from these four sites which indicate that ECE can be an effective corrosion control option for cldofide centaminated reinforced concrete structures. Key words: Reinforced Concrete, Bridge Structures, Electrochemical ECE, Field Experience, Long-term Monitoring
Electrochemical chloride extraction (ECE) is a process that is becoming increasingly popular as a viable rehabilitation option to stop on-going corrosion of the embedded steel in chloride contaminated reinforced concrete structures. ECE is accomplished by applying an electric field between a temporary external anode and the reinforcing steel (the cathode) which causes the migration of negatively charged chloride ions in the concrete away from the steel towards the positively charged anode. Since the early 1990's hundreds of reinforced concrete structures worldwide, including the USA and Canada, have been treated with ECE. Majority of these structures in the USA has been installed through funding from the Federal Highway Administration. The performance of four of these structures has been monitored over the period 1995-1998. The present paper discusses the long-term monitoring results from these four sites which indicate that ECE can be an effective corrosion control option for cldofide centaminated reinforced concrete structures. Key words: Reinforced Concrete, Bridge Structures, Electrochemical ECE, Field Experience, Long-term Monitoring
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