Mitigation of High Sulfate Soils in Texas

Despite increased knowledge and awareness of sulfate heave, the Texas Department of Transportation (TxDOT) continues to experience pavement failures during and immediately after construction on roads designed to last 20 years or more. Failures are particularly evident in sites where high sulfate soils of 8000 ppm or higher predominate. Many of these failures are attributed to sulfate-induced heave where an expansive mineral called ettringite is formed from calcium-based stabilizers reacting with water, clay, and sulfates. The researchers have identified several tasks to address development of methods to quantify reactive alumina and silica in treated soils; establish stabilizer dosage and sulfate concentrations at which heaving occur; understand the rate of heaving or ettringite formation kinetics; address reactions between sulfates and other additives such as fly ash and develop mitigation strategies to address heaving in sulfate soils. Project deliverables will include: 1) development of methods to better understand the causes of heaving in chemically treated high sulfate soils, and 2) develop methods or strategies to limit the sulfate heaving in these high sulfate soils.

Language

  • English

Project

  • Status: Completed
  • Contract Numbers:

    0-6618

  • Sponsor Organizations:

    Texas Department of Transportation

    125 E. 11th Street
    Austin, TX  United States  78701-2483
  • Project Managers:

    Arellano, Miguel

  • Performing Organizations:

    University of Texas, Arlington

    P.O. Box 4089
    Arlington, TX  United States  76010
  • Principal Investigators:

    Puppala, Anand

  • Start Date: 20100901
  • Expected Completion Date: 0
  • Actual Completion Date: 20130831
  • Source Data: RiP Project 27665

Subject/Index Terms

Filing Info

  • Accession Number: 01568960
  • Record Type: Research project
  • Source Agency: Texas Department of Transportation
  • Contract Numbers: 0-6618
  • Files: RiP, STATEDOT
  • Created Date: Jun 30 2015 1:03AM