Wehner-Schulze machine: First UK experiences with a new test for polishing resistance in aggregates

The Wehner-Schulze test was developed during the 1960s in Germany, at the Technical University of Berlin, as an alternative laboratory test procedure for assessing the polishing of aggregates in road surfacings. At that time, it was considered that the Polished Stone Value (PSV) test was not satisfactory because it gave relatively small numerical differences between different aggregates used in Germany and had poor reproducibility. The Wehner-Schulze (W-S) procedure, similarly to the PSV test, is designed to simulate accelerated wear on road surfacing materials and test the friction provided by the specimen before and after that wear. An important difference between the PSV test and the Wehner-Schulze procedure, however, is that the latter uses large, flat specimens that can be obtained from actual road surfaces, made in the laboratory from mixed materials or made in the laboratory as plates using aggregate alone. The test is carried out using a purpose-designed machine that is now available commercially. This report describes work done at TRL to commission the first UK Wehner Schulze machine, when it was purchased by the Highways Agency and includes the results of the initial measurements on specimens made with various aggregates (primarily gritstone, granite or limestone) in the three different forms mentioned above. (A)

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/09684093
• Authors:
  • WOODBRIDGE, M
  • DURNFORD, A
  • ROE, P
• Publication Date: 2006-9

Language

• English

Media Info

• Pagination: 28p
• Serial:
  • PUBLISHED PROJECT REPORT PPR144
  • Publisher: TRL
  • ISSN: 0968-4093

Subject/Index Terms

• TRT Terms: Aggregates; Coefficients; Design; Evaluation; Polished aggregates; Tests
• Geographic Terms: Germany; United Kingdom
• ITRD Terms: 4577: Aggregate; 6410: Coefficient; 9011: Design (overall design); 9020: Evaluation (assessment); 8125: Germany; 3822: Polishing; 6255: Test; 8119: United Kingdom
• Subject Areas: Design; Geotechnology; Pavements; I22: Design of Pavements, Railways and Guideways;

Filing Info

• Accession Number: 01034123
• Record Type: Publication
• Source Agency: Transport Research Laboratory
• Files: ITRD
• Created Date: Oct 6 2006 2:20PM