Chloride Diffusivity of Magnetic Nanometakaolin Mortar in the Presence of Sulfates
Publication: Journal of Materials in Civil Engineering
Volume 34, Issue 10
Abstract
The purpose of this paper is to investigate the effect of magnetic water (MW) on the chloride diffusivity of mortar exposed to 5% NaCl solution in the presence of various sulfate concentrations (2%–7%). Cement was replaced with 0%–1.5% nanometakaolin (NMK). MW of 1.2 T was used in magnetic specimens. The degradation in mortars was evaluated in terms of compressive strength, mass change, chloride profile and penetration depth, thermogravimetric analysis (TGA), scanning electron microscopy (SEM), and X-ray diffraction analysis after exposure times up to 52 weeks. Using MW rather than tap water resulted in a significant decrease in the degradation level of all tested specimens. When compared to nonmagnetic mortars, the loss of compressive strength and the formation of ettringite in magnetic specimens were retarded by approximately 4 weeks. The chloride content and penetration depth decreased with increasing sulfate concentration. The 1.5% NMK magnetic mortar showed the minimum degradation in the hardened paste matrix.
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Data Availability Statement
No data, models, or code were generated or used during the study.
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Published In
Journal of Materials in Civil Engineering
Volume 34 • Issue 10 • October 2022
Copyright
© 2022 American Society of Civil Engineers.
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Received: Oct 29, 2021
Accepted: Jan 25, 2022
Published online: Jul 21, 2022
Published in print: Oct 1, 2022
Discussion open until: Dec 21, 2022
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