Open Access

ARTICLE

Study on Air-Purifying Performance of Semi-Flexible Asphalt Samples Coated with Titanium Dioxide Using Different Methods

by Shoujing Yan¹, Yangyang Wang^2,*, Fengxia Chi¹, Xue Luo², Tianjie Zhang³, Chenchen Xi¹

1 Institute of Road Engineering, Zhejiang Scientific Research Institute of Transport, Hangzhou, 310023, China
2 Department of Architecture and Civil Engineering, Zhejiang University, Hangzhou, 310027, China
3 Department of Computer Science, Boise State University, Boise, 83725-1145, USA

* Corresponding Author: Yangyang Wang. Email:

(This article belongs to the Special Issue: Green Coating and Film for Degeneration Protection)

Journal of Renewable Materials 2022, 10(5), 1321-1335. https://doi.org/10.32604/jrm.2022.017545

Received 19 May 2021; Accepted 12 July 2021; Issue published 22 December 2021

Abstract

Titanium dioxide (TiO₂) was recently employed to apply onto road surfaces to degrade the harmful compounds from vehicle emissions. However, it remains a challenging task to find a highly compatible pavement type for TiO₂ application to achieve durable and efficient air-purifying performance. This study proposed to coat TiO₂ particles onto semi-flexible pavement surface and tried to investigate an optimum coating method. Three coating methods, including direct mixing TiO₂ (MT) with asphalt mixture, spraying dry TiO₂ (ST) coating and water-solution-based TiO₂ (WT) coating on semi-flexible pavement surface. To achieve this objective, semi-flexible samples were prepared to evaluate and compare the performances of three coating methods by employing resistance to wearing, NO removal efficiency tests and residual texture depth tests. It was found that the ST method not only provided better NO degrading efficiency but also improved the resistance to wearing than the other two methods.

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