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Article

Evaluation of NOx Reduction Effect and Impact on Asphalt Pavement of Surface Treatment Technology including TiO2 and Asphalt Rejuvenator

Department of Highway and Transportation Research, Korea Institute of Civil Engineering and Building Technology, 283 Goyangdae-ro, Ilsanseo-gu, Goyang-si 10223, Korea
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Author to whom correspondence should be addressed.
Academic Editors: Jiaqi Chen, Kezhen Yan and Jun Xie
Appl. Sci. 2021, 11(23), 11571; https://doi.org/10.3390/app112311571
Received: 12 November 2021 / Revised: 30 November 2021 / Accepted: 30 November 2021 / Published: 6 December 2021
(This article belongs to the Special Issue Road Materials and Sustainable Pavement Design)
Nitrogen oxide (NOx), emitted at the highest rate among automobile exhaust gases, is the main cause of air pollution, and various construction technologies are being developed to reduce NOx emissions. In this study, the NOx reduction effect of surface treatment technology for road pavements, and the effect of the photocatalytic reaction on asphalt pavements, were evaluated using a photocatalyst. Three types of titanium dioxide (TiO2) were used as photocatalysts, and an asphalt rejuvenator used to recover aged asphalt was applied as a surface treatment agent. To evaluate the NOx reduction effect, a test device capable of testing large-sized specimens was manufactured and compared with the ISO method, which only allowed the testing of small specimens. In addition, the effect of TiO2 and the asphalt rejuvenator on the asphalt mixture was analyzed through chemical analysis. The test results of the newly manufactured mixed-tank photo reactor showed the same trend as the ISO test results concerning the evaluation of its NOx removal performance. As a result of the performance evaluation of the surface treatment using TiO2, the NO removal rate was up to 7.83% when Anatase-type TiO2 with excellent light efficiency was applied. In addition, when the rejuvenator was used, the oxidation of asphalt, caused by the photoreaction of TiO2, was reduced. View Full-Text
Keywords: titanium dioxide; asphalt surface treatment; nitrogen oxide; photocatalytic reaction titanium dioxide; asphalt surface treatment; nitrogen oxide; photocatalytic reaction
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MDPI and ACS Style

Lee, J.-W.; Baek, C. Evaluation of NOx Reduction Effect and Impact on Asphalt Pavement of Surface Treatment Technology including TiO2 and Asphalt Rejuvenator. Appl. Sci. 2021, 11, 11571. https://doi.org/10.3390/app112311571

AMA Style

Lee J-W, Baek C. Evaluation of NOx Reduction Effect and Impact on Asphalt Pavement of Surface Treatment Technology including TiO2 and Asphalt Rejuvenator. Applied Sciences. 2021; 11(23):11571. https://doi.org/10.3390/app112311571

Chicago/Turabian Style

Lee, Jong-Won, and Cheolmin Baek. 2021. "Evaluation of NOx Reduction Effect and Impact on Asphalt Pavement of Surface Treatment Technology including TiO2 and Asphalt Rejuvenator" Applied Sciences 11, no. 23: 11571. https://doi.org/10.3390/app112311571

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