Novel Method of Coating Titanium Dioxide on to Asphalt Mixture Based on the Breath Figure Process for Air-Purifying Purpose
Publication: Journal of Materials in Civil Engineering
Volume 28, Issue 5
Abstract
Titanium dioxide () is a photocatalyst that has the capability of accelerating the oxidation of nitrogen oxides () and other pollutants under ultraviolet (UV) radiation. A number of studies have been conducted on applying onto pavement surface to purify exhaust emissions from vehicles. However, it remains a challenging task to effectively coat to asphalt pavements to achieve durable air-purifying performance. This study aims to develop an innovative method, based on the breath figure (BF) process and Pickering emulsion effect, to coat particles onto asphalt pavement surfaces. With this method, asphalt binder with micro pores filled with particles can be coated to asphalt pavement surfaces. The micro porous structure of the coating material helps to provide larger contact area between and UV, thus enhancing degradation efficiency. Microscopic analysis on the coating material prepared using the new method demonstrated that particles distributed well on the pore walls of the coating material, indicating that UV can reach to activate the photocatalytic process. The nitric oxides (NO) removal efficiencies of the asphalt mixture specimens coated using this new method and the traditional water solution–based method after various numbers of surface abrasions were also measured by a custom-designed environmental test setup. It was found that this new coating method provided not only better NO removal efficiency, but also improved durability to maintain the degradation efficiency after tire abrasion, compared to the traditional method.
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Acknowledgments
The authors would like to acknowledge the Department of Civil and Environmental Engineering of the Hong Kong Polytechnic University for the funding support and the technical guidance in microstructure characterization from Mr. Jianliang Gong from the Institute of Textiles & Clothing of the Hong Kong Polytechnic University. The contents of this study reflect the views of the authors, who are responsible for the facts and the accuracy of the data presented herein. This paper does not constitute a standard, specification, or regulation.
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Information & Authors
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Published In
Journal of Materials in Civil Engineering
Volume 28 • Issue 5 • May 2016
Copyright
© 2015 American Society of Civil Engineers.
History
Received: Mar 11, 2015
Accepted: Sep 8, 2015
Published online: Nov 18, 2015
Discussion open until: Apr 18, 2016
Published in print: May 1, 2016
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