air and water impacts of tx active concrete pavement st. louis, missouri, rte. 141
DESCRIPTION
Air and Water Impacts of TX Active Concrete Pavement St. Louis, Missouri, Rte. 141. TX Active Photocatalytic Cement. Developed by Italcementi Contains titanium dioxide (a photocatalyst) in anatase form Abates smog-forming emissions (e.g., nitrogen oxides) - PowerPoint PPT PresentationTRANSCRIPT
Air and Water Impacts of TX Active Concrete Pavement
St. Louis, Missouri, Rte. 141
TX Active Photocatalytic Cement• Developed by Italcementi • Contains titanium dioxide (a photocatalyst)
in anatase form• Abates smog-forming emissions (e.g.,
nitrogen oxides)• Self-cleaning, maintains surface color
NOX
siteNOXads
NO3-H+
●OH
Runoff water with a projected low NO3
- presence
Water
Adsorbs on ‘active’ site1
Oxidized by photo-generated hydroxyl ions
2
Washed from surface3
Photocatalytic Concrete
TX Active Research Project Overview• Relocated Rte 141 project, Chesterfield, MO
46,450 anticipated AADT Near St. Louis (population of 3,000,000))
• 1500 foot test section (placed in Oct 2011) Two-lift construction (2” on 7”) TX Active cement in top lift TX Active cement in pervious concrete shoulder
• Will monitor (over a 1-year period) Air quality (NOx, NO2, NO) Water quality (BOD, COD, nitrate)
• Funded by:
TX Active Project Site
TX Active
Control Air Sampling
Water Sampling
TX Active Project Photos