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.
Highlights
The quantity of vehicle keeps increasing rapidly in large cities, which emitted hundreds of millions of tons of vehicle emissions each year
It is worth to notice that the degrading efficiency of watersolution-based TiO2 (WT) is slightly higher than spraying dry TiO2 (ST) in the initial stage
The NO degrading efficiency of WT drops drastically since the average RDE value declines from 86.573% to 79.549%, which declines much faster than ST (85.671% to 85.403%) within 4 h
Summary
The quantity of vehicle keeps increasing rapidly in large cities, which emitted hundreds of millions of tons of vehicle emissions each year. The high concentration of vehicle emissions is terrible when vehicles start or change speed, which brings serious harm to the surrounding environment and the health of residents [3,4]. Effective and efficient approaches to degrade the NOX as soon as they are emitted from vehicles are keenly desired. Titanium dioxide (TiO2) has many advantages such as highly stable chemically, super-hydrophilicity and relatively low price. It makes TiO2 an ideal photocatalytic material in construction engineering [5–7]. In the 1980s, organic pollution in wastewater was degraded by adding TiO2 and under high-intensity UV light [9,10]
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
