Evaluation of photocatalytic micro-surfacing mixture
road performance, vehicle exhaust gas degradation capacity and environmental impacts
Zhao Zhang (Chang'an University)
Kai Liu (Chang'an University)
Dan Chong (Shanghai University)
Dongyu Niu (TU Delft - Pavement Engineering, Chang'an University)
Peng Lin (TU Delft - Pavement Engineering)
X Liu (TU Delft - Pavement Engineering)
Yanhui Niu (Chang'an University)
Ruxin Jing (TU Delft - Pavement Engineering)
More Info
expand_more
Other than for strictly personal use, it is not permitted to download, forward or distribute the text or part of it, without the consent of the author(s) and/or copyright holder(s), unless the work is under an open content license such as Creative Commons.
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.