SKID RESISTANCE AND WEAR PROPERTIES OF AGGREGATES FOR ASPHALT PAVING MIXTURES

Mississippi gravel is extremely hard and when crushed, has a tendency to fracture into flat and elongated pieces. These flat pieces usually orient themselves during placement so that the flat sides are up which leads to rapid polishing. The source of the gravel has a significant effect on the skid number (SN) because of the natural rounding and polishing of the aggregate. Mississippi gravels are just as susceptible to polish as limestone and should cause as much concern. The use of a coarse aggregate utilizing a combination of limestone and crushed gravel gives a long-life surface with a skid resistance that is higher and retained longer than either a gravel or limestone mix. A sharp sand should always be used with these mixes. A predicted skid number based on accumulated skid data is much better than a predicted skid number based on skid tests on recently comleted pavement. Projects should be selected for scheduled skid tests in order to build a data base and to keep it updated. (Author) a data base and to keep it updated. (Author)

• Corporate Authors:

  Mississippi State Highway Department

  Research and Development Division, P.O. Box 1850
  Jackson, MI  United States  39215

  Federal Highway Administration

  1200 New Jersey Avenue, SE
  Washington, DC  United States  20590
• Authors:
  • Kidd, S Q
• Publication Date: 1985-2

Media Info

• Features: Appendices; Figures; Tables;
• Pagination: 158 p.

Subject/Index Terms

• TRT Terms: Aggregates; Asphalt mixtures; Coarse aggregates; Gravel; Limestone; Polishing (Aggregates); Skid resistance; Wear
• Uncontrolled Terms: Crushed gravel
• Subject Areas: Geotechnology; Highways; Materials; Pavements; I36: Aggregates;

Filing Info

• Accession Number: 00450581
• Record Type: Publication
• Report/Paper Numbers: MSHD-RD-85-55
• Files: TRIS, USDOT, STATEDOT
• Created Date: Aug 27 2004 9:01PM