Ecology, Environment and Conservation Paper

Vol. 22, April Suppl. Issue 2016; Page No.(477-487)

EVALUATION OF STRENGTH AND DURABILITY OF CORROSION INHIBITING SYSTEMS USED IN REINFORCED SELF COMPACTING CONCRETE

R. Dharmaraj and R. Malathy

Abstract

In this experimental study the effect of corrosion inhibitor (calcium nitrite) in SCC has been examined on both the fresh and hardened concrete. The properties like compressive, split and flexural strength were also were studied. For M25 mix design in SCC, the cement was 40% replaced with fly ash and the varying percentages of corrosion inhibitors from 0% to 5% i.e., 0%, 1%, 2%, 3%, 4% and 5% to the total volume of cement along with addition of super plasticizer 0.5%. With reference to the EFNARC specification the trial mixes were formed. The main focus of this study is investigation of optimum concrete mix percentage of corrosion inhibitor i.e. 4%. Self compacting concrete with CN4% (calcium nitrite 4%) giving better performance in terms of strength and durability when compare to all other calcium nitrite percentages with the self compacting concrete. The results of laboratory investigation on the rapid chloride permeability test and reinforced concrete beams with and without corrosion inhibitor (CI) when tested at 7 and 28 days respectively. The investigation revealed that the rapid chloride permeability test, half cell potential measurement, accelerated corrosion, weight loss measurement, Sorptivity and flexural behaviour of reinforced concrete beams is comparable to with and without corrosion inhibitor (calcium nitrite).

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