Effect of Size and Location of Repair on Flexure Strength of RC Beams

Abstract

 Most of the recent studies were interested in the bonding between the base concrete and repair concrete. Considering that the information about this subject was insufficient to study the structural behaviour of the repaired concrete beams and to compare the different treatment materials used for bonding, also to compare the properties of appeared cracks in the bonding zone during the loading process in terms of the cracks lengths and widths, as well as the effect of making the surface of base concrete rougher. This field study aims to investigate the effect of the size and location of the repair on the structural behaviour and the loading capacity of the samples and compare the repaired samples to a control sample which was prepared and tested without treatment. In this study, samples of concrete beams were 15 beams with different sizes and locations for the treatment to study the structural behaviour of concrete beams. The results revealed that the increase of the treatment decreases the flexural strength, and it was observed that the symmetric treatment in concrete beams in terms of length and width along the concrete beam is an important factor in enhancing the structural behaviour, and helps to achieve high deflection values to increase the possibility of having a ductility failure, especially in the tension zone and to increase the flexure strength.