Analysis of gravel aggregates, a predominant source in Indiana, determined the factors affecting friction properties when used in highway bituminous overlays. Petrographic, physical, and friction tests were performed. Petrographically, each rock particle was identified using hand lens and HCl. Particles were classified into five groups: igneous, metamorphic, limestone, dolomite, and other sedimentary rocks. For physical properties, absorption, specific gravity, Los Angeles abrasion loss, and freeze-thaw loss were considered. To measure friction properties related to skid resistance, aggregate coupons were made from each individual rock type. Initial friction values (IFV) and Polished values (PV) were measured using the British Pendulum tester (ASTM Standard D3319, E303). Results of the petrographic study indicate gravel samples consist mainly of carbonates (limestone and dolomite). Igneous rock is next abundant, followed by other sedimentaries and metamorphic rocks. Based on British Pendulum test results and correlation with other properties, dolomites in gravel samples have higher IFV and PV values than do limestones and other sedimentaries. Igneous and metamorphic rocks are highest. Crushed faces of gravels are highly correlated with increased IFV and PV. Gravels are a potential aggregate source for bituminous wearing courses on Indiana highways.

  • Supplemental Notes:
    • Unlike most groups and organizations that meet on a regular basis, the Highway Geology Symposium has no central headquarters, no annual fees, and no formal membership requirements. The governing body of the Symposium is a Steering Committee. Recent proceedings may be obtained from the Treasurer of the Symposium, Mr. Russell Glass.
  • Corporate Authors:

    Mr. Russell Glass

    100 Wolf Cove Road
    Asheville, NC  United States  28804
  • Authors:
    • West, T R
    • Cho, K H
  • Conference:
  • Publication Date: 2002


  • English

Media Info

  • Features: Figures; Photos; References; Tables;
  • Pagination: p. 316-327

Subject/Index Terms

Filing Info

  • Accession Number: 00962034
  • Record Type: Publication
  • Report/Paper Numbers: CD-ROM
  • Files: TRIS
  • Created Date: Aug 12 2003 12:00AM