PITTING CORROSION MODEL for REINFORCED CONCRETE STRUCTURES in a CHLORIDE ENVIRONMENT
Corrosion of steel reinforcement in concrete structures can be classified into two categories: general (uniform) corrosion and pitting (localized) corrosion. In general, concrete researchers use uniform corrosion to study the effect of corrosion on reinforced concrete structures. However, this approach is not accurate for concrete structures subjected to chloride attack, which usually experiences pitting corrosion. This paper describes accelerated corrosion test used to obtain statistical parameters of maximum pit-depths distribution of corroded steel in reinforced concrete. Using probabilistic analysis, these statistical parameters are combined with statistical parameters of reinforced concrete beams (i.e. beam dimensions, concrete strength, steel yield strength, cover thickness, workmanship quality, insitu strength factor, model error for flexure and shear and also corrosion rate) to determine the effect of corrosion on flexural and shear strength of reinforced concrete beams. The results show that pitting corrosion has significant effect on flexural and shear strength of reinforced concrete beam.