DOCUMENTATION OF ELECTROCHEMICAL MAINTENANCE METHODS
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Published:2002
O Vennesland, 2002. "DOCUMENTATION OF ELECTROCHEMICAL MAINTENANCE METHODS", Challenges of Concrete Construction: Volume 3, Repair, Rejuvenation and Enhancement of Concrete: Proceedings of the International Seminar held at the University of Dundee, Scotland, UK on 5–6 September 2002, Ravindra K. Dhir, M. Roderick Jones, Li Zheng
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The electrochemical methods used for corrosion protection of concrete structures are cathodic protection, electrochemical realkalisation and electrochemical chloride removal. By these electrochemical methods the protective properties of the concrete are either reinstated (chloride removal, realkalisation), or the potential of the reinforcement is changed to a value that brings back passivity to the reinforcement (cathodic protection).
The execution of the processes should be controlled by current measurements (all processes) or by potential shifts (cathodic protection).
For electrochemical chloride removal the result should be documented by chloride analyses of the concrete before and after treatment. For electrochemical realkalisation the result should be documented by the pH value of the concrete pore water. For both chloride removal and realkalisation the current charge per unit area should be documented.
THE PROCESSES
PRE-CONTROL
PROCESS CONTROL
FINAL CONTROL
ACCEPTANCE CRITERIA
CONCLUSIONS
REFERENCES
