Electrochemical Noise Measurement to Assess Corrosion of Steel Reinforcement in Concrete

Abstract

The electrochemical noise method (ENM) has previously been employed to monitor the corrosion of steel reinforcement in concrete. The development of solid-state Ag/AgCl-based probes and dedicated monitoring technology (ProCoMeter) now offers a wider range of ENM configurations. The present study involves the laboratory investigation of three mortar samples containing steel bars and varying additions of chloride, with a view to future field application. ENM could be used to provide corrosion information on reinforcement without the need to provide direct electrical connections to the steel and without the risk or inducing or increasing corrosion. In addition to half-cell potentials, measurements were made using ENM in three different probe configurations over a total test period of 90 days. The samples were then broken open and the bars extracted and cleaned. A comparison was then made between the calculated metal thickness loss obtained from the Rn values and the actual metal thickness loss. The results showed that each configuration was able to order the results in the expected manner, with the simple single substrate (SSS) arrangement providing the best correlation with direct measurements. The study is ongoing with the intention of measurements being obtained in situ on existing reinforced concrete structures.

Corrosion Resistance of Reinforcing Steel in Concrete Using Natural Fibers Treated with Used Engine Oil

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Non-destructive evaluation of subsurface corrosion on hot steel angle sections embedded in concrete and its repair by cement slurry and nitozinc coating

“…The Rebound Hammer Test assesses the concrete's surface hardness and, by extension, its structural integrity [13,14]. This test is particularly useful in cases where manual repair is considered, provided there is no calcium chloride present in the concrete [15,16]. Cathodic Protection is a crucial technique used to halt the rusting process of steel reinforcement within the concrete [17].…”

Electrochemical Noise Study of the Passivation of AISI 1018 Carbon Steel as Reinforcements Embedded in Ternary Concretes During the Setting Process

“…Due to the excellent relationship between concrete and steel, this material has excellent strength characteristics; the compressive strength is mostly attributed to concrete, while steel provides great resistance to tensile stresses [1]. This is not the only advantage of these materials working together, since it is known that concrete provides excellent protection to steel against exogenous attacks that could damage its "durability" [2]. One characteristic that it has been gaining importance in recent years, since it is not profitable to have a structure that satisfies resistance needs if it does not guarantee an adequate service life [3].…”