Report 322 Polished stone value of aggregates and in-service skidding resistance

Publication Year

1998

Document Status

Current

Abstract

For many years, aggregates for use in new surfacings have been selected according to their ability to resist polishing, as measured by their Polished Stone Value (PSV). However, decisions are now having to be made for more heavily-trafficked roads than were included in the original research and experience has suggested that expected performance is not always achieved in practice. A database of skidding resistance, aggregate properties, and traffic levels was used to review aggregate performance in service. From an analysis of these data, new models for predicting skidding resistance from PSV and traffic data were derived. A series from laboratory studies of polishing was also carried out to investigate some of the phenomena observed.

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