The Effect Of Corrosion On The Expansion Of Concrete

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Corrosion of reinforcement embedded in concrete is a major concern for the durability ofrnconcrete. Its effect is seen through tensile strain development, loss of bond betweenrnconcrete and rebar or the reduction in the cross-sectional area of the reinforcement. Therncorrosion products (solid and liquid portion) might exhibit more than six times asrncompared to the parent rebar. Accordingly, this volumetric expansion of the productsrncauses hoop tensile stress on the concrete. rnThe research tried to investigate the effects of concrete quality, nature of rebar and thernclear cover thickness on the expansion experienced by concrete specimens whenrnreinforcements within them corrode. rnA total of fifteen cylindrical concrete samples having a central reinforcement runningrnthrough them were prepared for three different water to cement ratios. Out of the fifteenrnsamples, six of them had 45mm clear cover while the rest had 28mm. The samples werernprepared to alleviate end effect using corrosion resistant epoxy. rnTo figure out a proper accelerated corrosion test (ACT) set-up, three trial corrosion testsrnwere carried out. Finally, a suitable test set-up was devised and the ACTs of the samplesrnwere grouped into four and were performed. rnAfter the analysis of the experimental outputs, it was found that as the water cement ratiornincreases the strain due to corrosion increased for 28mm clear cover samples and therncontrary was the case for the samples with 45mm cover. Also, the clear cover thickness ofrnsamples affected the strain development and this effect was seen to be massive for samplesrnwith the highest water to cement ratio. rnIn addition, samples with plane bars showed a slight resilience against corrosion. However,rnonce corrosion started along the surface of plane bars, the strain development is rapid andrnfor the lowest water to cement ratio this was more pronounced.

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The Effect Of Corrosion On The Expansion Of Concrete

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