1. Air and Water Impacts of TX Active Concrete Pavement St
Air and Water Impacts of TX Active Concrete Pavement St. Louis, Missouri, Rte. 141

2. 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

3. Photocatalytic Concrete3
Washed from surface
Water
NOX H+
NO3- 1
Adsorbs on ‘active’ site
●OH
NOXads
Runoff water with a projected low NO3- presence
site 2
Oxidized by photo-generated hydroxyl ions

4. 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:

5. TX Active Project Site
Water Sampling
TX Active
Control
Air Sampling

6. TX Active Project Photos