Investigation on material properties and surface characteristics related to tyre–road noise for thin layer surfacings

Thin layer surfacings are very popular to reduce tyre–road noise in the Netherlands and some other European countries. In this study, laboratory measurements were carried out to investigate the mixture composition, surface texture and sound absorption of thin layer surfacings. Both slab samples produced in the lab and the cores drilled from trial sections were used for measurements. Observations were made on the test results, and the influence of different material properties on the texture and sound absorption were investigated. A relationship between the connected air voids content and the overall porosity of the surface is also analyzed.