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Improvements of Nano-TiO2 on the Long-Term Chloride Resistance of Concrete with Polymer Coatings

1
Jiangsu Key Laboratory of Environmental Impact and Structural Safety in Engineering, China University of Mining and Technology, Xuzhou 221116, China
2
State Key Laboratory for Geo-mechanics and Deep Underground Engineering, China University of Mining and Technology, Xuzhou 221116, China
3
Jiangsu Collaborative Innovation Center for Building Energy Saving and Construction Technology, Jiangsu Vocational Institute of Architectural Technology, Xuzhou 221116, China
*
Author to whom correspondence should be addressed.
Coatings 2019, 9(5), 323; https://doi.org/10.3390/coatings9050323
Received: 1 May 2019 / Revised: 11 May 2019 / Accepted: 15 May 2019 / Published: 16 May 2019
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Abstract

The long-term chloride resistance of concrete treated with nano-TiO2-modified polymer coatings was studied. Three types of organic film-forming paints: polyurethane, epoxy resin, and chlorinated rubber were selected, and concrete specimens with nano-TiO2-modified coatings were fabricated. Then, specimens were subjected to periodical ultraviolet-accelerated aging and subsequent Coulomb electric flux experiments. Nanomodified coatings before and after ultraviolet aging were observed through scanning electron microcopy. Results indicate that the nano-TiO2 particles can effectively reduce the microdefects in coating films and alleviate damages due to aging. As a result, nano-TiO2 can significantly reduce the Coulomb fluxes of coated concrete before and after coating aging, and the average reduction amplitudes reached 66% and 44%. That is, nano-TiO2 can remarkably improve the long-term chloride resistance of coated concrete. In addition, we established the development models of the ultraviolet aging and chloride resistance of coated concrete according to an S-shaped curve. View Full-Text
Keywords: concrete; polymer coatings; nano-TiO2; chloride resistance; aging concrete; polymer coatings; nano-TiO2; chloride resistance; aging
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Li, G.; Cui, H.; Zhou, J.; Hu, W. Improvements of Nano-TiO2 on the Long-Term Chloride Resistance of Concrete with Polymer Coatings. Coatings 2019, 9, 323.

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