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Effect of potassium-chromate and sodium-nitrite on concrete steel-rebar degradation in sulphate and saline media

Okeniyi, Joshua Olusegun and Omotosho, Olugbenga Adeshola and Ajayi, O. O. and Loto, C. A. (2014) Effect of potassium-chromate and sodium-nitrite on concrete steel-rebar degradation in sulphate and saline media. Construction and Building Materials 50. pp. 448-456.

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Abstract

In this paper, effect of potassium-chromate (K2CrO4) and sodium-nitrite (NaNO2) on concrete steel-rebar degradation in sulphuric-acid and in sodium-chloride media were studied. Electrochemical monitoring of open circuit potential and compressive strength effect of the different concentrations of these admixtures in steel-reinforced concretes immersed in the acidic/marine-simulating environments were analysed for detailing admixture performance. Results subjected to ASTM C876 interpretations showed that concrete admixed with 0.145 M potassium-chromate exhibited optimum inhibition effectiveness with good compressive strength improvement in the acidic medium. In the saline medium, the concrete admixed with 0.679 M sodium-nitrite exhibited optimal inhibition performance, but with reduction in concrete compressive strength

Item Type: Article
Uncontrolled Keywords: Concrete steel-rebar Potassium-chromate and sodium-nitrite inhibitors Microbial/marine-simulating environments Normal and Weibull distributions Kolmogorov–Smirnov statistics Compressive strength of concrete
Subjects: T Technology > T Technology (General)
T Technology > TJ Mechanical engineering and machinery
T Technology > TP Chemical technology
Divisions: Faculty of Engineering, Science and Mathematics > School of Engineering Sciences
Depositing User: Mrs Patricia Nwokealisi
Date Deposited: 27 Oct 2016 10:16
Last Modified: 27 Oct 2016 10:16
URI: http://eprints.covenantuniversity.edu.ng/id/eprint/7361

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