Mitigation of concrete reinforced steel corrosion by penta sodium triphosphate: physicochemical and electrochemical inve
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Mitigation of concrete reinforced steel corrosion by penta sodium triphosphate: physicochemical and electrochemical investigations Binsi M. Paulson1 · K. Joby Thomas1 · Vinod P. Raphael2 · K. S. Shaju2 · K. Ragi1 Received: 29 May 2020 / Accepted: 23 September 2020 © Springer Nature Switzerland AG 2020
Abstract The capacity of penta sodium triphosphate (PST) to avert the steel reinforcement corrosion in contaminated concrete by NaCl was investigated for 480 days using electrochemical impedance spectroscopy, potentiodynamic polarization, half-cell potential and gravimetric methods. The mechanism of interaction of PST molecules and the changes took place on the steel surface assessed using spectroscopic and microscopic analysis. Compression tests of the concrete specimens were performed to monitor the strength of concrete after the addition of PST. Investigations proved that PST acts as a competent admixture for inhibiting the corrosion of steel reinforcement in concrete without affecting its strength for a longtime. Graphic abstract
Keywords Corrosion · Inhibitor · Concrete steel reinforcement · Admixture * K. Joby Thomas, [email protected]; [email protected] | 1Center for Electrochemical Studies, Department of Chemistry, St. Thomas’ College (Autonomous), Thrissur, Kerala 680001, India. 2Department of Chemistry, Government Engineering College, Thrissur, Kerala 680009, India. SN Applied Sciences
(2020) 2:1813
| https://doi.org/10.1007/s42452-020-03586-1
Vol.:(0123456789)
Research Article
SN Applied Sciences
(2020) 2:1813
1 Introduction Steel reinforced concrete is an economically successful material for construction. It can cast to various shapes and designs which is strong and have a long life time. Over the last few years, intense investigations are taking place on the corrosion of reinforced steel in concrete. Corrosion is deleterious to the service life of concrete structures in respect of significant depletion of their durability results in increasing the maintenance expenditure than construction cost. In some cases, a reduction in lifetime occurs due to the disintegration of steel rebar in concrete structures [1–10]. Broadly, the term concrete corrosion indicates chemical or physicochemical disintegration of concrete components and structures, due to the attack of corroding agents like CO2, chlorides, sulphates, fluorides, nitrates etc. on the reinforcing steel bars [11–16]. Steel rebar in concrete is protected by a passive film formed by the alkalinity of concrete, which can be disrupted by the reaction with above mentioned reactants [17–22]. The corrosion of the rebars drops the structural integrity of the concrete bridges, pipelines, buildings and other assets constructed. When the concentration of chlorides exceeds a threshold value of about 0.4–1% by weight of cement, corrosion is initiated and pitting corrosion occurs [23–30]. This results the formation of hydrated iron oxide or rust on steel rebar, which slowly expands and generates an internal pressure in concrete leading to
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