Effect of Application Methods on Effectiveness of Titanium Dioxide as Photocatalyst Compound to Concrete Pavement

Photocatalytic compounds have the potential of removing harmful air pollutants from urban areas. One proposed method to expand the reach of this technology is to apply titanium dioxide to concrete pavement surface to result in air-purifying concrete pavement. However, the proper method of applying titanium dioxide to the concrete surface is still unclear. To this end, the objective of this study was to evaluate three methods of application for titanium dioxide to concrete pavement. Prepared samples were subjected to weathering and abrasion by using an accelerated loading test and rotary abrasion. The environmental efficiency of the original and weathered samples to remove nitrogen oxides from the atmosphere was measured using a newly developed laboratory setup. Microscopic analysis was conducted using scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS) to determine the relative concentration and distribution of titanium dioxide particles on the surface before and after weathering. Results of the experimental program showed that in the original state, the coating with 5% TiO2 and the PT product were the most efficient in removing nitrogen oxide from the air stream. On the other hand, results of the rotary abrasion test indicated that the use of a thin coating would be more susceptible to abrasion than the photocatalysis compounds applied using the sprinkling method or using the PT product. The highest NOx removal efficiency in the rotary abrasion state was measured for the coating with 5% TiO2. Results of SEM and EDS analysis showed that the samples treated with the PT product had a more uniform distribution and a higher concentration of TiO2 than the samples treated with the sprinkling method. This may explain the greater NO removal efficiency observed in the samples treated with PT product.

Language

  • English

Media Info

  • Media Type: DVD
  • Features: Figures; Photos; References;
  • Pagination: 14p
  • Monograph Title: TRB 89th Annual Meeting Compendium of Papers DVD

Subject/Index Terms

Filing Info

  • Accession Number: 01154883
  • Record Type: Publication
  • Report/Paper Numbers: 10-0746
  • Files: TRIS, TRB
  • Created Date: Jan 25 2010 10:21AM