Stabilization of a High Sulfate Soil Project in Eagle Pass, Texas

It is generally accepted that soils with sulfate concentrations above 8,000 parts per million (ppm) should not be treated with calcium-based additives. The Texas Department of Transportation identified a portion of a road in Eagle Pass that contained sulfate concentrations in excess of 32,000 ppm. Previous research has shown that ground granulated blastfurnace slag (GGBFS) plus lime effectively reduces three dimensional (3-D) swell and increases unconfined compressive strength (UCS) in the laboratory. This research answers questions about the applicability of ground granulated blastfurnace slag plus lime on a real project. The effectiveness of the stabilizer was determined by measuring 3-D swell reduction and UCS in the laboratory prior to construction. Based on strength gain and reduced swell, the Texas Department of Transportation decided to stabilize the project with a mixture of 4 percent ground granulated blastfurnace slag plus 1 percent lime. Approximately 2600 feet of the project was constructed with this stabilizer combination. As of this writing, the road has not shown any signs of distress. The ground granulated blastfurnace slag plus lime reduced swell, increased strength, and was cost effective for the Texas Department of Transportation to use in place of calcium-based stabilizers in high sulfate soils.

Language

  • English

Media Info

  • Media Type: CD-ROM
  • Features: Figures; Photos; References; Tables;
  • Pagination: 19p
  • Monograph Title: TRB 86th Annual Meeting Compendium of Papers CD-ROM

Subject/Index Terms

Filing Info

  • Accession Number: 01045582
  • Record Type: Publication
  • Report/Paper Numbers: 07-1741
  • Files: TRIS, TRB
  • Created Date: Feb 8 2007 6:25PM