Study on Carbonation Resistance of Nano-Modified TiO2 Coated Concrete Under Ultraviolet Radiation
In order to improve the carbonation resistance of coated concrete under ultraviolet irradiation,the cement-based crystalline coating and polyurethane coating were modified by introducing different amounts of rutile nano-TiO2.The rapid carbonation test results show that ul-traviolet radiation will weaken the carbonation resistance of the coated concrete to a certain extent.With the increase of nano-TiO2 content,the anti-carbonation performance of the two coated concretes under ultraviolet radiation has been improved to varying degrees,and with the increase of nano-TiO2 content,the anti-carbonation performance shows a trend of first improving and then decreasing,among which the opti-mal content of nano-TiO2 in cement-based crystalline coating is 2%,the optimal content of nano-TiO2 in polyurethane coating is 1%-2%,and the anti-carbonation performance of polyurethane coating is most obvious under ultraviolet light.The results of this paper can provide en-gineering guidance for the improvement of concrete coatings in service under ultraviolet environment.
carbonation of concreteultraviolet rayscoatingnano-TiO2
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