Eleven years of evaluation since construction with lime tilled subgrade soils in place of aggregate subbase indicate that lime stabilization can be substituted for standard subbase materials. The few small failures which have occurred are attributed to poor drainage. Lime was spread on the scarified subgrade directly from the transport using a homemade spreader. Mixing was accomplished with a Bros mixer towed behind a medium size tractor. Initial mixing into the soil was done immediately after the dry lime had been spread and enough water added to bring the soil up to at least optimum. Further details of construction are described, as well as the soil conditions, cost and evaluation. The amount of the lime used for stabilizing the soil was determined by unconfined compressive strength tests. The soils tested did not show a great increase in compressive strength upon the addition of lime. Approximately 150,000 equivalent 18k axle loads have been sustained by this roadway in the last 11 years.

  • Supplemental Notes:
    • Prepared in cooperation with the U.S. Department of Transportation, Federal Highway Administration.
  • Corporate Authors:

    Colorado Department of Highways

    Planning and Research Division, 4201 East Arkansas Avenue
    Denver, CO  United States  80222
  • Authors:
    • Donnelly, D E
    • Gerhardt, B B
    • Swanson, H N
  • Publication Date: 1977-3

Media Info

  • Features: Figures; Tables;
  • Pagination: 25 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00157897
  • Record Type: Publication
  • Source Agency: Federal Highway Administration
  • Report/Paper Numbers: FHWA-CO-RD-77-2 Final Rpt., FCP45C3154
  • Contract Numbers: 1475 HP&R
  • Created Date: Dec 27 1977 12:00AM