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

被引：29

作者：

Li, Guo ^{[1
,2
,3
]}

Cui, Hangyuan ^{[1
]}

Zhou, Jiacheng ^{[1
]}

Hu, Weijian ^{[1
]}

机构：

[1] China Univ Min & Technol, Jiangsu Key Lab Environm Impact & Struct Safety E, Xuzhou 221116, Jiangsu, Peoples R China

[2] China Univ Min & Technol, State Key Lab Geomech & Deep Underground Engn, Xuzhou 221116, Jiangsu, Peoples R China

[3] Jiangsu Vocat Inst Architectural Technol, Jiangsu Collaborat Innovat Ctr Bldg Energy Saving, Xuzhou 221116, Jiangsu, Peoples R China

来源：

COATINGS | 2019年 / 9卷 / 05期

关键词：

concrete; polymer coatings; nano-TiO2; chloride resistance; aging; SURFACE-TREATMENT; CARBONATION RESISTANCE; ORGANIC COATINGS; PERFORMANCE; CORROSION; NANOCOMPOSITES; POLYURETHANE; EXPOSURE; BARRIER; SILICA;

D O I：

10.3390/coatings9050323

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

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.

引用

页数：9

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