Photocatalytic asphalt mixtures: semiconductors’ impact in skid resistance and texture

Abstract

Photocatalytic asphalt mixtures have the capability of mitigating air quality problems and degrade oils/greases by using semiconductors. The techniques to do so can change their functional characteristics. This study aimed to analyse the functionalization effect on the essential surface characteristics, such as macrotexture, skid resistance, and microtexture. AC 14 and AC 6 mixtures were functionalised with nano-TiO 2 and micro-ZnO by spraying and bulk incorporation. Mean Profile Depth, British Pendulum and microtexture amplitude parameters were evaluated. TiO 2 application seemed to smooth the surface slightly. In dry condition, the skid resistance of functionalised asphalt and control mixtures was similar. In wet condition, the functionalization caused a maximum decrease of 7% in skid resistance. The amplitude parameters were not affected by any functionalization technique except the skewness of AC 14 with 6% TiO 2 by bulk incorporation. Furthermore, the application of the semiconductors can be used without high impacts in texture and skid resistance.

Development of Photocatalytic 3D-Printed Cementitious Mortars: Influence of the Curing, Spraying Time Gaps and TiO2 Coating Rates

“…By keeping a vertical distance of 25 cm between the top surface of the samples and the light source, the specimens were irradiated by light power density The spraying coating technique was used as the functionalization method of the samples. The coating was applied by spraying a TiO 2 aqueous suspension onto the specimens' surfaces based on our previous work carried out over asphalt mixtures developed by [8,40,41]. This method of functionalizing material surfaces consists of spraying the TiO 2 aqueous suspension onto the specimens' surfaces using an atmospheric air compressor (Figure 2b).…”

Smart, Photocatalytic and Self-Cleaning Asphalt Mixtures: A Literature Review

“…The functionalization techniques by spraying coating using aqueous solution and volume incorporation led to a difference in friction between −7% and 3%. The microtexture amplitude parameters were not affected by any functionalization technique except the skewness of AC 14 with 6% TiO 2 by volume incorporation [89].…”

Review and analysis of advances in functionalized, smart, and multifunctional asphalt mixtures

“…Functionalization techniques with a sprayed aqueous solution containing nano-TiO 2 and/or micro-ZnO and nano-TiO 2 by volume incorporation led to a change in the SR between − 7% and 3 %. All functionalization techniques did not influence the microtexture amplitude parameters, except for the skewness of AC 14, incorporating 6 % TiO 2 by volume [45].…”