Classification and Characterization of Tire-Road Wear Particles in Road Dust by Density

Abstract

Tire treads are abraded by friction with the road surface, producing tire tread wear particles (TWPs). TWPs combined with other particles on the road such as road wear particles (RWPs) and mineral particles (MPs), forming tire-road wear particles (TRWPs). Dust on an asphalt pavement road is composed of various components such as TRWPs, asphalt pavement wear particles (APWPs), MPs, plant-related particles (PRPs), and so on. TRWPs have been considered as one of major contaminants produced by driving and their properties are important for study on real abrasion behaviors of tire treads during driving as well as environmental contamination. Densities of the TRWPs are totally dependent on the amount of the other components deposited in the TWPs. In this study, a classification method of TRWPs in the road dust was developed using density separation and the classified TRWPs were characterized using image analysis and pyrolytic technique. Chloroform was used to remove APWPs from mixture of TRWPs and APWPs. TRWPs were found in the density range of 1.20–1.70 g/cm3. By decreasing the particle size of the road dust, the TRWP content in the road dust increased and its density slightly tended to increase. Aspect ratios of the TRWPs varied and there were many TRWPs with low aspect ratio below 2.0. The aspect ratio range was 1.2–5.2. Rubber compositions of the TRWPs were found to be mainly NR/SBR biblend or NR/BR/SBR triblend.

Microplastics in Coastal Urban Sediments: Discrepancies in Concentration and Character Revealed by Different Approaches to Sample Processing

“…The latter are effectively microscopic forms of plastiglomerates and plasticrustsagglutinates of plastic and inorganic maor layers of plastic on a substrate that have been fused together by burning (Corcoran et al, 2014;De la Torre et al, 2022). In many ways, they are also similar to agglomerates of tyre wear particles and road surface particles formed during frictional abrasion at the road surface (Jung and Choi, 2022). In this study, both aggregates and plastiglomerates (or combined MPs) were more important in sediments from Coxside and the Tamar than at Saltram.…”

Measures to Reduce the Discharge of tire Wear into the Environment

“…The emitted tire wear particles are approx. 4-350 µm in size (on average 100 µm) [3], with a density of 1.2-1.7 g/cm 3 [5]. Due to the material and size distribution, tire wear is given attention in terms of fine particulate matter (PM10) and also in the microplastics discussion.…”

Experimental study of materials for the filtration of the intake air of the internal combustion engine of a motor vehicle

“…The use of motor vehicles is mainly "non-motor" pollutants, i.e. those generated by the abrasion process in friction pairs: brake discfriction lining, clutch disc-pressure plate [41,43], as well as by the abrasion of the tire tread against the road surface [19,22,36,47]. The engine's exhaust system is mainly a source of soot, which is a product of incomplete combustion of fuel, as well as products of abrasive wear of the engine's metal surfaces, which form the piston-ring-cylinder or journal-pan associations.…”