By Paul M. Chess, John P. Broomfield
Cathodic safeguard of metal in Concrete presents the main accomplished precis of the electrochemical recommendations for treating metal corrosion thus far. It comprises an exam of the reasons of corrosion and its accelerating fee and describes evaluation tools.
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Additional info for Cathodic Protection of Steel in Concrete
5 Assessment of results of investigation Following the investigation stage, the results should be processed and assessed to provide information on the risk and extent of corrosion. It is most important that the interpretation of results encompasses the data from all the test methods; assessing the condition in isolation, from only one test method, can be misleading. Some test methods can be influenced by external environmental conditions which can change APPRAISAL OF CORROSION-DAMAGED STRUCTURES 27 from day to day.
1 INTRODUCTION There are many causes of concrete deterioration. Common among these are reinforcement corrosion due to chloride attack or carbonation, freeze/thaw cycling, alkali-silica reaction (ASR) and poor quality of detailing, materials or workmanship. Other causes are sulphate attack, structural defects such as excessive flexural cracking (due to overloading, under-capacity or severe reinforcement corrosion) or differential settlement and defects arising during construction such as plastic or thermal cracking.
2 Repair by removal of all chloride-contaminated concrete Repairing the structure by removing chloride-contaminated concrete and replacing it with fresh concrete is more likely to succeed than simply patching visual defects. However, it is considered that to achieve a high probability of long-term repair, it is important that all areas of concrete affected by chloride contamination are removed and replaced and that the reinforcement is cleaned to a high standard. This method may result in the removal of large quantities of concretes which are contaminated but otherwise sound.