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

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...

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Main Authors:	Guo Li, Hangyuan Cui, Jiacheng Zhou, Weijian Hu
Format:	Article
Language:	English
Published:	MDPI AG 2019-05-01
Series:	Coatings
Subjects:	concrete polymer coatings nano-TiO<sub>2</sub> chloride resistance aging
Online Access:	https://www.mdpi.com/2079-6412/9/5/323

id	doaj-22f6fb8421444a018651ed116b4a1cf0
record_format	Article
spelling	doaj-22f6fb8421444a018651ed116b4a1cf02020-11-24T21:32:33ZengMDPI AGCoatings2079-64122019-05-019532310.3390/coatings9050323coatings9050323Improvements of Nano-TiO<sub>2</sub> on the Long-Term Chloride Resistance of Concrete with Polymer CoatingsGuo Li0Hangyuan Cui1Jiacheng Zhou2Weijian Hu3Jiangsu Key Laboratory of Environmental Impact and Structural Safety in Engineering, China University of Mining and Technology, Xuzhou 221116, ChinaJiangsu Key Laboratory of Environmental Impact and Structural Safety in Engineering, China University of Mining and Technology, Xuzhou 221116, ChinaJiangsu Key Laboratory of Environmental Impact and Structural Safety in Engineering, China University of Mining and Technology, Xuzhou 221116, ChinaJiangsu Key Laboratory of Environmental Impact and Structural Safety in Engineering, China University of Mining and Technology, Xuzhou 221116, ChinaThe long-term chloride resistance of concrete treated with nano-TiO<sub>2</sub>-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-TiO<sub>2</sub>-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-TiO<sub>2</sub> particles can effectively reduce the microdefects in coating films and alleviate damages due to aging. As a result, nano-TiO<sub>2</sub> 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-TiO<sub>2</sub> 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.https://www.mdpi.com/2079-6412/9/5/323concretepolymer coatingsnano-TiO<sub>2</sub>chloride resistanceaging
collection	DOAJ
language	English
format	Article
sources	DOAJ
author	Guo Li Hangyuan Cui Jiacheng Zhou Weijian Hu
spellingShingle	Guo Li Hangyuan Cui Jiacheng Zhou Weijian Hu Improvements of Nano-TiO<sub>2</sub> on the Long-Term Chloride Resistance of Concrete with Polymer Coatings Coatings concrete polymer coatings nano-TiO<sub>2</sub> chloride resistance aging
author_facet	Guo Li Hangyuan Cui Jiacheng Zhou Weijian Hu
author_sort	Guo Li
title	Improvements of Nano-TiO<sub>2</sub> on the Long-Term Chloride Resistance of Concrete with Polymer Coatings
title_short	Improvements of Nano-TiO<sub>2</sub> on the Long-Term Chloride Resistance of Concrete with Polymer Coatings
title_full	Improvements of Nano-TiO<sub>2</sub> on the Long-Term Chloride Resistance of Concrete with Polymer Coatings
title_fullStr	Improvements of Nano-TiO<sub>2</sub> on the Long-Term Chloride Resistance of Concrete with Polymer Coatings
title_full_unstemmed	Improvements of Nano-TiO<sub>2</sub> on the Long-Term Chloride Resistance of Concrete with Polymer Coatings
title_sort	improvements of nano-tio<sub>2</sub> on the long-term chloride resistance of concrete with polymer coatings
publisher	MDPI AG
series	Coatings
issn	2079-6412
publishDate	2019-05-01
description	The long-term chloride resistance of concrete treated with nano-TiO<sub>2</sub>-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-TiO<sub>2</sub>-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-TiO<sub>2</sub> particles can effectively reduce the microdefects in coating films and alleviate damages due to aging. As a result, nano-TiO<sub>2</sub> 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-TiO<sub>2</sub> 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.
topic	concrete polymer coatings nano-TiO<sub>2</sub> chloride resistance aging
url	https://www.mdpi.com/2079-6412/9/5/323
work_keys_str_mv	AT guoli improvementsofnanotiosub2subonthelongtermchlorideresistanceofconcretewithpolymercoatings AT hangyuancui improvementsofnanotiosub2subonthelongtermchlorideresistanceofconcretewithpolymercoatings AT jiachengzhou improvementsofnanotiosub2subonthelongtermchlorideresistanceofconcretewithpolymercoatings AT weijianhu improvementsofnanotiosub2subonthelongtermchlorideresistanceofconcretewithpolymercoatings
_version_	1725956962176204800

Improvements of Nano-TiO<sub>2</sub> on the Long-Term Chloride Resistance of Concrete with Polymer Coatings

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