Effect of Nano-Based Coatings on Concrete under Aggravated Exposures
Publication: Journal of Materials in Civil Engineering
Volume 32, Issue 10
Abstract
In this study, a nano-silica (5% to 50%) water-based solution and silane/nano-clay (5% to 50%) composite were used as superficial treatments for concrete. The coatings were applied on concretes with different water-to-binder ratios (0.35 to 0.6). The transport properties of treated concrete were evaluated by the rapid chloride penetrability test and absorption and desorption percentages. Moreover, the treated concrete was subjected to severe durability exposures: physical salt attack and salt-frost scaling. Deterioration of the concrete surface was visually assessed and quantified by mass loss; in addition, mineralogical, thermal, and microscopy analyses were performed on concrete specimens to elucidate the mechanisms of enhancement imparted by surface treatments. The results showed that increasing the concentration of nano-silica in the colloid led to improved performance of concrete, with 50% dosage leading to the least penetration depth, absorption and desorption percentages, and mass loss, whereas for the silane/nano-clay composite, a low percentage (5%) of nano-clay was adequate to mitigate the damage of concrete under aggravated conditions.
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Data Availability Statement
All data, models, and code generated or used during the study appear in the published article.
Acknowledgments
The authors highly appreciate the financial support from Natural Sciences and Engineering Research Council of Canada and University of Manitoba Graduate Fellowship. The IKO Construction Materials Testing Facility at the University of Manitoba has been instrumental for conducting these tests.
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Information & Authors
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Published In
Journal of Materials in Civil Engineering
Volume 32 • Issue 10 • October 2020
Copyright
© 2020 American Society of Civil Engineers.
History
Received: Nov 24, 2019
Accepted: Mar 4, 2020
Published online: Jul 25, 2020
Published in print: Oct 1, 2020
Discussion open until: Dec 25, 2020
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