Use Prudent Specifications with Titanium Dioxide

I read with interest your article on photoactive titanium dioxide (TiO₂) in concrete [see EBN Vol. 16, No. 5]. I have been following the product launch for several years, have published articles on the technology, and have spoken about the material at an American Concrete Institute’s nanotechnology conference. My research has satisfied me that the material performs as the manufacturer claims with regards to the removal of organic grime (but not inorganic stains) from the surface of concrete and the depollution of nearby air.
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