Repair and strengthening of R.C. structures deteriorated due to salt content

R. C. structures deterioration due to salt content can be consideredas one of the major problems in the Middle East. This problem becomeseven greater when R. C. structures suffers deterioration due tochloride ions, which may require the replacement of large volumes ofthe original concrete due to its contamination and deterioration.The objective of this study is divided into two main parts. The firstpart is to study the structural behaviour of eighty models of R.C. beamswith fixed steel reinforcement and concrete constituents when exposedto four types of chlorides; ammonium, calcium, magnesium, and sodiumchloride and two types of cement; ordinary portland cement (O.P.C.)and sulphate resistance cement (S.R.C.) In addition, different wetcuring periods were considered .The second part is to investigate the structural behaviour ofsixteen models of repaired beams. Experiments conducted in this partfocus on concrete volume to be chipped beyond both bare bars and epoxycoated bars. Also, two exposure periods were considered to investigatethe effect of chloride ions migration from host concrete to repairedconcrete on the efficiency of different repair techniques with ageing.Finally, all beams were tested up to failure, and the influence ofvariable factors on the structural deformations, failure loads, strains,cracking behaviour and modes of failure were discussed.