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Title: Gum arabic nanoparticles as green corrosion inhibitor for reinforced concrete exposed to carbon dioxide environment
Authors: Asaad, Mohammad Ali
Huseien, Ghasan Fahim 
Baghban, Mohammad Hajmohammadian
Raja, Pandian Bothi
Fediuk, Roman
Faridmehr, Iman
Alrshoudi, Fahed
Keywords: Carbonation resistance
Depth car-bonation
Green corrosion inhibitor
Rebar corrosion
Issue Date: 19-Dec-2021
Publisher: MDPI
Citation: Asaad, Mohammad Ali, Huseien, Ghasan Fahim, Baghban, Mohammad Hajmohammadian, Raja, Pandian Bothi, Fediuk, Roman, Faridmehr, Iman, Alrshoudi, Fahed (2021-12-19). Gum arabic nanoparticles as green corrosion inhibitor for reinforced concrete exposed to carbon dioxide environment. Materials 14 (24) : 7867. ScholarBank@NUS Repository.
Rights: Attribution 4.0 International
Abstract: The inhibiting effect of Gum Arabic-nanoparticles (GA-NPs) to control the corrosion of reinforced concrete that exposed to carbon dioxide environment for 180 days has been investigated. The steel reinforcement of concrete in presence and absence of GA-NPs were examined using various standard techniques. The physical/surface changes of steel reinforcement was screened using weight loss measurement, electrochemical impedance spectroscopy (EIS), atomic force microscopy and scanning electron microscopy (SEM). In addition, the carbonation resistance of concrete as well screened using visual inspection (carbonation depth), concrete alkalinity (pH), thermogravimetric analysis (TGA), SEM, energy-dispersive X-ray spectroscopy (EDX) and X-ray diffraction (XRD). The GA-NPs inhibitor size was also confirmed by transmission electron microscopy (TEM). The results obtained revealed that incorporation of 3% GA-NPs inhibitor into concrete inhibited the corrosion process via adsorption of inhibitor molecules over the steel reinforcement surface resulting of a protective layer formation. Thus, the inhibition efficiency was found to increase up-to 94.5% with decreasing corrosion rate up-to 0.57 × 10-3 mm/year. Besides, the results also make evident the presence of GA-NPs inhibitor, ascribed to the consumption of calcium hydroxide, and reduced the Ca/Si to 3.72% and 0.69% respectively. Hence, C-S-H gel was developed and pH was increased by 9.27% and 12.5, respectively. It can be concluded that green GA-NPs have significant corrosion inhibition potential and improve the carbonation resistance of the concrete matrix to acquire durable reinforced concrete structures. © 2021 by the authors. Licensee MDPI, Basel, Switzerland.
Source Title: Materials
ISSN: 1996-1944
DOI: 10.3390/ma14247867
Rights: Attribution 4.0 International
Appears in Collections:Staff Publications

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