CONSTRUCTION AND PERFORMANCE OF A STONE MATRIX ASPHALT MIX TEST SECTION IN VIRGINIA. FINAL REPORT

Stone Matrix Asphalt (SMA) is a gap-graded mix filled with a rich asphalt-fines mastic developed in Europe. In 1991 five states constructed trial sections to determine if satisfactory mixes could be produced in the United States with current materials and high rates of production. This report discusses Virginia's first section, placed in 1992 near Lynchburg. During construction, better equipment was necessary to control the amount of fines contained in SMA mixes. Lack of control in the mix gradation caused variability on the roadway and on routine mix tests conducted during construction. The mix containing the cellulose fiber, Arbocel, has rutted more at stop-lights than the mix containing the polymer, Vestoplast, or the high-stability control mix. However, all mixes continue to perform well. Laboratory creep tests and gyratory shear tests predicted that the control mix and Vestoplast mix would be more resistant to rutting and consolidation under traffic. This investigation and work in other states have improved the current Virginia specification for SMA. The gradation was coarsened, a stiffer asphalt cement was required, and plant equipment that can adequately handle the aggregates was used. With these changes, future installations will perform better than the current dense graded mixes.

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• Record URL:
  • https://rosap.ntl.bts.gov/view/dot/19393
• Corporate Authors:

  Virginia Transportation Research Council

  530 Edgemont Road
  Charlottesville, VA  United States  22903

  Virginia Department of Transportation

  1401 East Broad Street
  Richmond, VA  United States  23219

  Federal Highway Administration

  1200 New Jersey Avenue, SE
  Washington, DC  United States  20590
• Authors:
  • Maupin Jr, G W
• Publication Date: 1995-8

Language

• English

Media Info

• Features: Appendices; Figures; References; Tables;
• Pagination: 35 p.

Subject/Index Terms

• TRT Terms: Cellulose; Construction; Construction equipment; Creep tests; Gyratory testing machines; Mix design; Pavement performance; Polymers; Rutting; Shear tests; Stone matrix asphalt; Test sections
• Old TRIS Terms: Gyratory tests
• Subject Areas: Construction; Highways; Materials; Pavements; I23: Properties of Road Surfaces; I31: Bituminous Binders and Materials; I52: Construction of Pavements and Surfacings;

Filing Info

• Accession Number: 00711754
• Record Type: Publication
• Report/Paper Numbers: FHWA/VA-95-R27, VTRC 95-R27, Proj No. 3051-010
• Files: NTL, TRIS, USDOT, STATEDOT
• Created Date: Sep 15 1995 12:00AM