Evaluation of photocatalytic micro-surfacing mixture

road performance, vehicle exhaust gas degradation capacity and environmental impacts

Journal article (2022)

Authors

Zhao Zhang Chang'an University
Kai Liu Chang'an University
Dan Chong Shanghai University
D. Niu Pavement Engineering - CEG , Chang'an University
P. Lin Pavement Engineering - CEG
X. Liu Pavement Engineering - CEG
Yanhui Niu Chang'an University
R. Jing Pavement Engineering - CEG
Research Group
Pavement Engineering (CEG) (TU Delft)
Copyright: © 2022 Zhao Zhang, Kai Liu, Dan Chong, D. Niu, P. Lin, X. Liu, Yanhui Niu, R. Jing
DOI
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https://doi.org/10.1016/j.conbuildmat.2022.128367
Micro-surfacing mixture Nano-TiO Photocatalytic degradation PP fibers Road performance Vehicle exhaust
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Published Date

2022

Language

English

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Faculty

Civil Engineering & Geosciences

Department

Engineering Structures

Research Group

Pavement Engineering

Abstract

To purify severe air pollution in traffic-intensive urban areas and tunnels, an innovative type of photocatalytic micro-surfacing mixture (PMM) was designed, which was enhanced by polypropylene (PP) fiber and nano-TiO2. In this work, the road performance of sixteen PMMs with the different contents of PP and nano-TiO2 were evaluated by wet-track abrasion test, wheel rutting deformation test and low-temperature splitting test. The vehicle exhaust (VE) gas degradation capacity of sixteen PMMs was characterized under ultraviolet (UV) light and visible light conditions. The life cycle assessment (LCA) methodology was applied to evaluate the environmental impact of PMM. The results showed that the road performances of PMM were improved with the increase of the PP fibers amount. The VE gas degradation capacity was significantly enhanced with the increase of nano-TiO2 amount. PMM with 0.2 wt% PP fibers and 60 wt% replacement of mineral filler with nano-TiO2 was a viable alternative to improve photocatalytic degradation of VE in pavement engineering. In addition, the modified micro-surfacing mixture facilitates a significant reduction in energy consumption and greenhouse gas emissions.