Mechanism and Monitoring of Reinforcement Corrosion in Concrete Attacked by Sulfuric Acid
Yuzuru TAMAI, Reiko SEKI, Takashi YAMAMOTO, Atsushi HATTORI and Toyoaki MIYAGAWA
Abstract:In this paper, corroding process of reinforcement in concrete and mortar subjected to sulfuric acid attack was investigated by visual observation, by measuring profile of sulfate ion and pH with respective indicators, and by measuring corrosion area and weight loss of reinforcement. Application of the electro-chemical monitoring methods (half-cell potential, polarization resistance, and concrete resistivity), which are usually used for reinforcement subjected to chloride induced corrosion, to the sulfuric acid attack was also discussed Obtained results showed that sulfate ion affected the corrosion initiation of reinforcement before the cover concrete was dissolved, and that the corrosion initiation can be detected by the concrete resistivity. Key Words:Steel corrosion, Chemical attack, Sulfuric acid, Electoro-chemical monitoring method, Concrete Ph