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L. Kirchmaier, R. Blab:
"Consideration of sand polishing resistance in the Austrian standard - The Wehner/Schulze sand polishing test";
Vortrag: First International Conference on Road and Rail Infrastructures - CETRA 2010, Opatija; 17.05.2010 - 18.05.2010; in: "Road and Rail Infrastructure, Proceedings of the Conference CETRA 2010", Department of Transportation, Faculty of Civil Engineering, University of Zagreb, (2010), ISBN: 978-953-6272-37-2; S. 409 - 415.

Skid resistance of dense road surface layers beside the texture profile also depends on the polishing resistance of fine and coarse aggregates. The test procedure according to Wehner/Schulze, which is used for testing the polishing resistance of sand, has gained acceptance on a scientific - technical level throughout Europe. Up to now, published results and limiting values for the polishing resistance of fine mineral aggregates are based on experiences with a testing device of an older design. This paper details a new Austrian evaluation background for the polishing resistance of sand using a Wehner/Schulze testing device of the latest design.
Based on the evaluation background requirements concerning the sand polishing resistance are set for highly stressed wearing courses in the Austrian standard. The test procedure as well as the testing device is briefly described. The research results prove that the polishing resistance between coarse and fine aggregates differs, thus separate requirements for different particle sizes are necessary, because only the combination of highly polishing resistant sand and gravel enables a sustainable skid resistance of road surface layers. Since the Wehner/Schulze testing device is not very widespread in Austrian national material testing laboratories, an alternative test method for determination of the polishing resistance of sand using the accelerated polishing machine is presented. The research results allow sand-producing enterprises a first assessment of the polishing characteristics of their sands using the accelerated polishing machine.

polishing resistance, skid resistance, Wehner/Schulze, fine aggregates, PWS

http://publik.tuwien.ac.at/files/PubDat_185872.pdf