Methods for the application of titanium dioxide coatings to concrete pavement

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Photocatalytic compounds have the potential to remove harmful air pollutants from urban areas. The objective of this study is to evaluate three methods of application for TiO 2-a cement-based thin coating, a water-based titanium dioxide solution (referred to in this paper as PT), and a sprinkling of TiO 2-to the fresh concrete surface before hardening. Prepared samples were subjected to wear and abrasion by using an accelerated loading test and rotary abrasion. The environmental efficiency of the original and worn samples to remove nitrogen oxides from the atmosphere was measured using a newly developed laboratory setup. Microscopic analysis was conducted using scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS) to determine the relative concentration and distribution of TiO 2 particles on the surface before and after wear. Results of the experimental program show that in the original state the coating with 5% TiO 2 and the PT product were the most efficient in removing nitrogen oxide (NO x) from the air stream. On the other hand, results of the rotary abrasion test indicate that the use of a thin coating would be more susceptible to abrasion than the photocatalysis compounds applied using the sprinkling method or using the PT product. The highest NO removal efficiency in the rotary abrasion state was measured for the coating with 5% TiO 2. Results of SEM and EDS analyses show that the samples treated with the PT product had a more uniform distribution and a higher concentration of TiO 2 than the samples treated with the sprinkling method. This may explain the greater NO removal efficiency observed in the samples treated with the PT product. © Chinese Society of Pavement Engineering.

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International Journal of Pavement Research and Technology

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