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عنوان انگلیسی مقاله:
Electrochemical process to improve the durability of concrete structures
سال انتشار : 2016
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مقدمه انگلیسی مقاله:
1. Introduction
Reinforcing steel embedded in a chloride-free Portland cement concrete exhibits a high degree of resistance to corrosion. The cement paste in the concrete provides an alkaline environment that protects steel against corrosion. This corrosion resistance is due to passivating or protective ferric oxide film that forms on the steel when it is embedded in fresh concrete. This film is stable in the highly alkaline concrete environment that has a pH of approximately 12–13. In the passive state, steel is protected by the naturally high pH and availability of oxygen in the concrete. The corrosion rate of steel in this state is negligible. The factors influencing depassivating forces are carbonation and penetration of chloride ions [1–3]. Corrosion steel is an electrochemical process. Two requirements are necessary for the development of a corrosion cell. Sufficient dissolved oxygen is required for reaction at the cathodic sites and moisture is required to maintain low electrical resistivity in the concrete between the anode and cathode. Anodes and cathodes on either a macro or micro scale develop, creating a corrosion cell. Micro cells occur within millimetres of each other, while macro cells may be upto several metres apart. In a corrosion cell, metallic iron corrodes or oxidizes at anodic sites to form ferrous ion with the release of two electrons and the reaction is shown in Eq
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کلمات کلیدی:
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