Title : EXPERIMENTAL PREDICTION OF TIME OF CRACKING OF CONCRETE UNDER ELECTRICAL POTENTIAL WITH REFERENCE TO REBAR CORROSION
Authors : P. Dinakar
Publication : 13th – 16th February 2013
Volume :
Pages : 8-Jan
Price : 250
Abstract : The corrosion of reinforcing steel in concrete structures is one of the primary causes of concern for asset owners worldwide. Corrosion is a dynamic process since it fluctuates with time as changes occur in the environmental conditions. In order to predict the life of a reinforced concrete, a correlation must be made between some of the accelerated short-term techniques adopted in the laboratory for assessing the corrosion behaviour. In this investigation, the corrosion behaviour of steel in concrete was studied and evaluated by accelerated short-term electrochemical techniques. Electrochemical techniques, such as polarization and accelerated corrosion cracking studies, were carried used on the concretes with steel embedded in the concrete cylinders. A method has been proposed to predict the life of reinforced concrete structures by using the results obtained from the above two techniques. The corrosion current from polarization studies that represents the propagation stage of corrosion, and the total charge to cracking that represents the maximum tolerable corrosion per unit area of the bar from accelerated corrosion cracking studies were used to estimate the life of the reinforced concrete. The results demonstrate that it is possible to estimate the life of a concrete for a given cover and for a given diameter of the bar by using these two electrochemical techniques and the method proposed