Laboratory and field studies of photocatalytic NOx and O3 removal by coatings on concrete.

Details

• Creators:
  Crain, Neil ; Juenger, Maria ; Cros, Clement ; Terpeluk, Alexandra ; Sullivan, David ; Kimura, Yosuke ; Spinhirne, Jarett ; Burris, Lisa ; McDonald-Buller, Elena ; Rung, Michael
• Corporate Creators:
  University of Texas at Austin. Center for Transportation Research
• Corporate Contributors:
  Texas. Dept. of Transportation. Research and Technology Implementation Office ; United States. Federal Highway Administration
• Subject/TRT Terms:
  • Concrete pavements
  • Coated materials
  • Coatings
  • Exhaust gases
  • Nitrogen oxides
  • Oxides
  • Air quality management Nitrogen Oxides
  • Nitric Oxide
  • Ozone
  • Photocatalytic
  More +
• Publication/ Report Number:
  FHWA/TX-17/0-6636-1
• Resource Type:
  Tech Report
• Geographical Coverage:
  Texas
• Corporate Publisher:
  University of Texas at Austin. Center for Transportation Research
• Abstract:
  This project involved thorough testing of titanium dioxide (TiO2)-containing commercial photocatalytic coatings ; applied to portland cement concrete for highway applications, focusing on the use of these coatings as an ; abatement method for atmospheric nitrogen oxide (NOx) and ozone (O3). The study consisted of four parts: ; laboratory chamber testing; outdoor exposure studies; modeling; and field application. Full-factorial experiments ; in laboratory chambers designed to examine the impact of variables such as temperature, relative humidity, time, ; and pollutant concentrations on NOx and O3 removal by the coatings demonstrated that a commercial stucco was ; the best performer of the four original materials tested. After one and two years of outdoor, roadside exposure, ; the NOx removal capacity of the stucco decreased significantly, but could be improved by soap and water ; washing. A Comprehensive Air Quality Model with extensions (CAMx) for the Houston-Galveston-Brazoria and ; Dallas-Fort Worth areas showed the potential of the stucco to reduce average ozone concentrations if large areas ; of highway structures are coated. Testing at a field site in north Austin, however, showed no conclusive ; difference between air quality in areas with coated and uncoated highway barriers. Therefore, while ; photocatalytic concrete coatings have promise for improving air quality, the data from this project suggest that ; such improvements may not be significant enough to be measured experimentally in common roadway ; configurations such as the site tested for this study.
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• Format:
  PDF
• Funding:
  TxDOT PROJECT NUMBER 0-6636
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/32130/dot_32130_DS1.pdf
• File Type:
  [PDF - 11.31 MB]
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha-512:54b683f02b9698afddf1884bd017fe7b7b5839da9f61ff73d48b1451782396bd7e30231861d184c54ff9917e17663c68ac454474f327143eac3a54aeeda91e46