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Air and Water Impacts of TX Active Concrete Pavement
St. Louis, Missouri, Rte. 141
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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
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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
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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:
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TX Active Project Site
TX Active
Control Air Sampling
Water Sampling
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TX Active Project Photos