Accelerated Stabilization Design of Subgrade Soils

Chemical stabilizers are commonly used to improve the performance of problematic soils. Lime, cement, and fly ash are typically used for this purpose. To achieve effective soil stabilization, type and concentration of the stabilizer are usually calculated based on the plasticity and gradation of the material. To achieve the mix design, the optimum stabilizer content is usually based on experience or following time-consuming specifications. New accelerated testing methods are proposed that minimize the time required for soil specimen preparation, curing, and moisture conditioning to complete the design process. Proposed methods were compared to current specifications. A curing time of 2 days and a back-pressure method to complete moisture conditioning are recommended to complete the mix design in 3 days. In addition, a more rigorous soil classification which considers the soil mineralogy is included. For that matter, simple chemical methods to determine the mineralogy of the soil fines are included. Cation Exchange Capacity, Specific Surface Area and Total Potassium could be used to substitute methods such as X-ray Diffraction and Scanning Electron Microscope. Durability and permanency studies on the treated and untreated soils were also evaluated to address the permanency and leachability of the chemical stabilization associated with rainfall infiltration and to simulate seasonal changes. Other important issues that were evaluated are adequate mixing and curing, adequate density and moisture, adequate short-term and long-term strength and stiffness, and proper construction.

• Record URL:
  http://ctis.utep.edu/reports/0812/2010&02&RR-0-5569-1&Accelerated%20Stabilization%20Design%20Of%20Subgrade%20Soils.pdf
• 
• Supplemental Notes:
  • Research Study Title: Accelerated Stabilization Design of Soils.
• Corporate Authors:

  University of Texas, El Paso

  Center for Transportation Infrastructure Systems
  500 W University Avenue
  El Paso, TX  United States  79968-0516

  Texas Department of Transportation

  Research and Technology Implementation Office, P.O. Box 5080
  Austin, TX  United States  78763-5080

  Federal Highway Administration

  1200 New Jersey Avenue, SE
  Washington, DC  United States  20590
• Authors:
  • Veisi, Maryam
  • Chittoori, Bhaskar
  • Celaya, Manuel
  • Nazarian, Soheil
  • Puppala, Anand J
  • Solis, Carlos
• Publication Date: 2010-2

Language

• English

Media Info

• Media Type: Web
• Edition: Technical Report
• Features: Appendices; Figures; Photos; References; Tables;
• Pagination: 255p

Subject/Index Terms

• TRT Terms: Accelerated tests; Calcium oxide; Cement; Concrete curing; Durability tests; Fly ash; Leaching; Mineralogy; Rainfall; Soil stabilization; Subgrade (Pavements)
• Subject Areas: Geotechnology; Highways; Pavements; I42: Soil Mechanics;

Filing Info

• Accession Number: 01159705
• Record Type: Publication
• Report/Paper Numbers: FHWA/TX 06/0-5569-1, Research Report 0-5569-1
• Contract Numbers: Project No. 0-5569
• Files: TRIS, USDOT, STATEDOT
• Created Date: Jun 24 2010 4:31PM