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Corrosion of steel reinforcement is one of the main causes of damage in concrete structures. Thus, the detection and prevention of corrosion of steel in concrete is important for the condition assessment and rehabilitation of reinforced concrete structures. Corrosion is an electrochemical process requiring an anode, a cathode, and an electrolyte. A moist concrete matrix forms an acceptable electrolyte and the steel reinforcement provides the anode and cathode. Electrical current flows between the cathode and anode, and the reaction results in an increase in metal volume as the iron (Fe) is oxidized into Fe(OH) 2 and Fe(OH)3 and precipitates as FeO.OH (rust color). Water and oxygen must be present for the reaction to take place. In good quality concrete the corrosion rate will be very slow. Accelerated corrosion will occur if the alkalinity (pH) is lowered (carbonation) or if aggressive chemicals or dissimilar metals or uneven chemical environment are introduced into the concrete. The structural capacity of a concrete member is affected by bar corrosion and cracking of surrounding concrete. Researches conducted on flexural beams found that in steel with more than 1.5 percent corrosion, the ultimate load capacity was reduced by 12 percent probably as a result of reduced bar diameter. The present research introduces an evaluation of the harmful effects of steel reinforcing corrosion on different kinds of structures. It also suggests a Quantitive Assessment program to estimate the rate of corrosion and the r esidual bearing capacity of RC elements containing corroded reinforcement based on mathematical techniques.

QUANTITIVE ASSESSMENT OF DETERIORATED RC STRUCTURES DUE TO REINFORCING STEEL CORROSION