Investigation of the effect of boron inhibitor on reinforced concrete by using the accelerated corrosion technique
Eskişehir Osmangazi University, Faculty of Engineering and Architecture, Department of Civil Engineering, Eskişehir, Turkey
Reinforcement corrosion induced by chloride is one of the most common reasons accounting for the premature deterioration of reinforced concrete (RC) structures. In this study, the effects of the use of chemical additives and corrosion inhibitors on the durability properties of the concrete and the potential of reinforcement corrosion were experimentally investigated. In this context, the effects of commercially common inhibitors and green inhibitors due to preventing corrosion and the interactions of these additives with each other were revealed. The reinforced concrete samples were prepared with four different chemical additives and two different corrosion inhibitors. Utilized chemical additives are; set accelerator, set retarder, super-plasticizer, and hyper-plasticizer; also, two different corrosion inhibitors were commercially common calcium nitrite-based corrosion inhibitor, and boron inhibitor which is obtained from natural boron. According to the laboratory experiments, concrete properties were enhanced with the synergistic collaboration of chemical additives and corrosion inhibitors. These effects are more acceptable than if chemical additives are applied individually in the concrete mix. Among all series, the concrete sample containing boron and hyper-plasticizer provided significant corrosion protection by reducing the initial corrosion current by 146,2 %. Moreover, as a result of the accelerated corrosion tests, latest damage occurrence time was calculated at 264 hours for the samples containing boron inhibitors, which is 106 hours for the control sample.
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