Effect of potassium-chromate and sodium-nitrite on concrete steel-rebar degradation in sulphate and saline media
详细信息 查看全文
- 作者：Joshua Olusegun Okeniyi ; Olugbenga Adeshola Omotosho ; Oluseyi Olanrewaju Ajayi ; Cleophas Akintoye Loto
- 关键词：Concrete steel-rebar ; Potassium-chromate and sodium-nitrite inhibitors ; Microbial/marine-simulating environments ; Normal and Weibull distributions ; Kolmogorov&ndash ; Smirnov statistics ; Compressive strength of concrete
- 刊名：Construction and Building Materials
- 出版年：15 January, 2014
- 年：2014
- 卷：50
- 期：Complete
- 页码：448-456
- 全文大小：2370 K
文摘
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.