Abstract
Thin, multi-functional concrete inlays constructed with flowable fibrous concrete (FFC) and containing titanium dioxide (TiO2) nanoparticles offer enhanced constructability and performance characteristics as well as environmental benefits, including the ability to reduce NOx pollution in near-road urban environments. Photocatalytic FFC mixes incorporating different cement types and fly ash replacement were prepared in the laboratory to characterize NOx removal ability and analyze the impact of factors such as carbonation and reflectance on photocatalytic activity. Highly reflective specimens containing white TiO2 cement greatly enhanced photocatalytic efficiency compared to less reflective specimens made with gray TiO2 cement. Carbonation of the concrete specimens significantly decreased photocatalytic performance, although mixes incorporating fly ash somewhat reduced the impact of carbonation on the photocatalytic efficiency. By quantifying the effects of different variables on photocatalytic performance, the results of this study can be used to optimize a photocatalytic concrete mix design to maximize NOx removal under certain environmental conditions, NOx concentration levels, and carbonation.
Published Version
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