Abstract
According to the latest findings particulate matter belong to the most significant pollutants in Europe together with ground-level ozone O3 and nitrogen dioxide NO2. Road traffic is one of the main sources of particulate matter. Traffic volume has unpleasant impact on longevity of the pavements and also on the environment. Vehicle motions cause mechanical wearing of the asphalt pavement surface - wearing course by vehicle tyres. The paper deals with abrasion of bituminous wearing courses of pavements. The asphalt mixtures are compared in terms of mechanically separated particulate matter. The samples of asphalt mixtures were rutted in wheel tracking machine. The particulate matter measurements were performed in laboratory conditions. The experimental laboratory measurements make it possible to sample particulates without contamination from exhaust emissions, abraded particles from vehicles, resuspension of road dust and climate affects. The paper offers partial results of measurements on six trial samples of asphalt mixtures with different composition. It presents particulate matter morphology and the comparison of rutted asphalt samples in terms of PM mass concentrations and chemical composition.
Highlights
Non-exhaust emissions of particulate matter from road traffic may originate from abrasion of vehicle parts or from pavement surface abrasion and from resuspension of dust [1, 1]
Imaging of Particulate matter (PM) was done by using the scanning electron microscope VEGA TS 5136 LSU (Tescan s.r.o., Czech Republic) that permits both low vacuum and high vacuum mode of measurements with resolution up to 3.5 nm
For more proper PM sources identification it is suitable to combine the knowledge on separate PM morphology with the chemical composition of PM
Summary
Non-exhaust emissions of particulate matter from road traffic may originate from abrasion of vehicle parts (tyres, brake linings, clutch and bodywork) or from pavement surface abrasion and from resuspension of dust [1, 1]. The aim of this research is to monitor the abraded particulate matter from non-combustion processes – from abrasion of pavement surface. A differentiation between PM emissions from road pavement abrasion and resuspension is very difficult due to their similar elemental composition 2. For this reason, the measurements are performed in the laboratory at the Department of Highway Engineering. The step is to attempt to determine the share of the mechanical separation of PM from the pavement by evaluating the chemical composition of the materials used for studied asphalt mixtures of wearing courses and subsequently collected particulate matter PM. The research is aimed at finding dependence between the composition of asphalt mixture and collected PM
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