Laboratory Evaluation of Environmental Performance of Photocatalytic Titanium Dioxide Warm-Mix Asphalt Pavements
Publication: Journal of Materials in Civil Engineering
Volume 24, Issue 5
Abstract
The use of titanium dioxide () coating for pavements has received considerable attention in recent years to improve air quality near large metropolitan areas. However, the proper method of applying TiO2 to asphalt pavements is still unclear. This study evaluated the benefits of incorporating in the preparation of warm-mix asphalt (WMA). Two application methods to integrate were evaluated, a water-based solution applied as a thin coating and using as a modifier to asphalt binder in the preparation of WMA. On the basis of the results of the experimental program, it was determined that the photocatalytic compound was not effective in degrading in the air stream when used as a modifier to the binder in the preparation of WMA. This could be attributed to the fact that only a small amount of is present at the surface. When used as part of a surface spray coating, was effective in removing nitrogen oxide () pollutants from the air stream with an efficiency ranging from 31 to 55%. The maximum removal efficiency was achieved at a coverage rate of . However, durability of the surface spray coating requires further evaluation. In addition, the increase in flow rate and relative humidity negatively impacted the effectiveness of reduction efficiency. In contrast, the increase in ultraviolet (UV) light intensity improved the removal efficiency of the surface coating.
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Acknowledgments
This work was funded under NSF award number 1032288. The authors would like to acknowledge the assistance of Cristal Millennium for providing this research with PC 105 ultrafine for testing and the Louisiana Transportation Research Center (LTRC) for granting access to their laboratory. The authors would also like to acknowledge the assistance of the Louisiana Department of Environmental Quality.
References
AASHTO. (2009a). “Standard practice for designing Superpave HMA.” AASHTO PP 28, Washington, DC.
AASHTO. (2009b). “Standard specification for performance-graded asphalt binder.” AASHTO M 320-09, Washington, DC.
Beeldens, A. (2006). “An environmentally friendly solution for air purification and self cleaning effect: The application of as photocatalyst in concrete.” Proc., Transport Research Arena Europe—TRA, Ljubljana, Slovenia.
Bilmes, S., Mandelbaum, P., Alvarez, F., and Victoria, N. (2000). “Surface and electronic structure of titanium dioxide photocatalyst.” J. Phys. Chem. BJPCBFK, 104(42), 9851–9858.
Dylla, H., Hassan, M. M., Mohammad, L., and Rupnow, T. (2010). “Evaluation of the environmental effectiveness of titanium dioxide photocatalyst coating for concrete pavements.” Transp. Res. Rec., 2164, 46–51.
Dylla, H., Hassan, M. M., Schmitt, M., Rupnow, T., Mohammad, L., and Wright, E. (2011). “Effects of roadway contaminants on titanium dioxide photodegradation of NOx.” Transportation Research Record 2240, Transportation Research Board, Washington, DC, 22–29.
FHWA. (2000). “Our nation’s highways—Selected facts and figures.” Publication No. FHWA-PL-01-1012, Office of Highway Information Management, Washington, DC.
Fujishima, A., and Honda, K. (1972). “Electrochemical photolysis of water at a semiconductor electrode.” Nature, 238, 37–38.
Fujishima, A., Rao, T. N., and Tryk, D. A. (2000). “Titanium dioxide photocatalysis.” J. Photochem. Photobiol., CJPPCAF, 1(1), 1–21.
Hassan, M. M. (2009). “Evaluation of the environmental impacts of ultrafine/nano photocatalyst coatings for pavements using life-cycle assessment.” Paper No. 09-1057, 88th Transportation Research Board Annual Meeting, National Research Council, Washington, DC.
Hassan, M. M., Dylla, H., Mohammad, L., and Rupnow, T. (2010). “Evaluation of the durability of titanium dioxide photocatalyst coating for concrete pavement.” Constr. Build. Mater.CBUMEZ, 24(8), 1456–1461.
Hodgson, A., Destaillat, T. H., Sullivan, D. P., and Fisk, W. J. (2007). “Performance of ultraviolet photocatalytic oxidation for indoor air cleaning applications.” Indoor AirINAIE5, 17(4), 305–316.
Japanese Standards Association (JSA). (2004). “Fine ceramics (advanced ceramics, advanced technical ceramics)—Test method for air purification performance of photocatalytic materials—Part 1: Removal of nitric oxide.” JIS R 1701-1, Tokyo, 1–9.
Li, L., and Qian, C. (2009). “A lab study of photo-catalytic oxidation and removal of nitrogen oxides in vehicular emissions and its fieldwork on Nanjing No. 3 bridge of Yangtze river.” Int. J. Pavement Res. Technol., 2(5), 218–222.
Louisiana Department of Transportation and Development (LADOTD). (2006). Louisiana standard specifications for roads and bridges, Baton Rouge, LA, 209–242.
Ohtani, B., Ogawa, Y., and Nishimoto, S. (1997). “Photocatalytic activity of amorphous-anatase mixture of titanium (IV) oxide particles suspended in aqueous solutions.” J. Phys. Chem. B, 101(19), 3746–3752.
Poon, C. S., and Cheung, E. (2007). “No removal efficiency of photocatalytic paving blocks prepared with recycled materials.” Constr. Build. Mater., 21(8), 1746–1753.
U.S. EPA. (1994). “Evaluation of ecological impacts from highway development.” EPA 300-B-94-006, Washington, DC.
Venturini, L., and Bacchi, M. (2009). “Research, design, and development of a photocatalytic asphalt pavement.” Proc., 2nd Int. Conf. on Environmentally Friendly Roads: ENVIROAD 2009, Research Institute of Roads and Bridges, Poland.
Znaidi, L., Seraphimova, R., Bocquet, J., Colbeau-Justin, C., and Pommier, C. (2001). “Continuous process for the synthesis of nanosize powders and their use as photocatalysts.” Mater. Res. Bull.,MRBUAC, 36(5–6), 811–825.
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© 2012. American Society of Civil Engineers.
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Received: May 23, 2011
Accepted: Oct 27, 2011
Published online: Nov 3, 2011
Published in print: May 1, 2012
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