STEEL SLAG AGGREGATE IN BITUMINOUS MIXES. FINAL REPORT

This report covers the evaluation of steel slag from open hearth, basic oxygen, or electric arc steel making processes used as an aggregate for bituminous asphalt mixes. Bituminous asphalt mixes demonstrate several good mix characteristics with steel slag aggregates. The characteristics include high stability, high skid resistance, longer heat retention after mixing, and ease of compaction without "shoving" in front of a roller compactor. Steel slag aggregates are abundant in Pennsylvania due to the once large steel processing centers. However, steel slag aggregates have potential for volumetric expansion due to the fast occurring hydration of calcium oxide and the slower hydration of magnesium oxide found in steel slag. For this reason, steel slag aggregates were evaluated in a Pennsylvania FB-2 binder and wearing course and in a FJ-1 wearing course to determine any potential for blow-ups or popouts at the pavement surface. Laboratory test results indicated no problems with any of the steel slag bituminous mixes. Steel slag specimens demonstrated a higher percent retained tensile strength and stability with less stripping than limestone specimens. The percent swell of the steel slag specimens was also within tolerable limits. Field pavements also had no problems.

  • Corporate Authors:

    Pennsylvania Department of Transportation

    Bureau of Bridge and Roadway Technology, T&S Bldg, Room 1009
    Harrisburg, PA  United States  17120
  • Authors:
    • Ramirez, T L
  • Publication Date: 1992-3

Language

  • English

Media Info

  • Features: Appendices; Figures; Photos; References; Tables;
  • Pagination: 60 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00624959
  • Record Type: Publication
  • Report/Paper Numbers: PA-91-019+79-012, Res Proj 79-012
  • Files: TRIS, STATEDOT
  • Created Date: Sep 18 1993 12:00AM