Abstract
Conventional asphalt absorbs and stores a large quantity of solar radiation, contributing to urban heat island (UHI) phenomenon. TiO2 quantum dots (QDs) are one of the important zero-dimensional nanocrystals with remarkable light reflection and fluorescence. In this study, the highly reflective and fluorescent asphalt binder modified with TiO2 QDs was proposed as an innovative UHI mitigation strategy. Optical and Superpave performance characterizations were employed on TiO2 QDs modified asphalt binder while its cooling potential was assessed by implementing microclimatic modelling. The results show that solar reflectance of asphalt binder increases from 12% to 17% when doping 5–30% TiO2 QDs compared to 3% of traditional asphalt binder. Meanwhile, fluorescent intensity of modified asphalt binder is increased by 43–289%. Compared to conventional asphalt binder, TiO2 QDs modified asphalt binder exhibits superior rutting resistance. The microclimatic modelling using ENVI-met simulation tool has revealed that asphalt coating with TiO2 QDs brings air temperature reduction by up to 2.9 °C. Moreover, economic analysis has shown that asphalt coating withTiO2 QDs could achieve desirable cost-effectiveness.
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