LIME-SOIL MIXTURE DESIGN CONSIDERATIONS FOR SOILS OF SOUTHEASTERN UNITED STATES

The Thompson procedure for lime-soil mixture design should be modified when soils of the southeastern United States are evaluated. The dominance of montmorillonite in the clay fraction of some Southeastern clays, especially those of the Alabama and Mississippi blackbelt, creates the need for careful consideration of compaction moisture contents for the lime-treated specimens. The effect of lime modification on these clays causes the optimum moisture content to increase by as much as 20 points (based on the increase in plastic limit). Therefore, the lime-treated soil must be compacted at a higher moisture content than the untreated soil. Although the different moisture contents confound the comparisons of unconfined compressive strength, the potential for moisture deficiency in the lime-treated material must be eliminated. A comparison of plastic limits for the untreated and lime-treated soil will provide an indication that the lime-soil mixture design will require this modification. The use of a modified accelerated curing procedure is recommended for soils of the southeastern United States. Data developed in this research program indicate that the Thompson-accelerated curing criteria of 48 h at 120 degrees F (49 degrees C) overestimate the 28-day, 75 degrees F (24 degrees C) unconfined compressive strengths of lime-treated blackbelt soils by an average of 22 percent. A 65-h, 105 degrees F (41 degrees C) accelerated-curing sequence underestimates the 28-day, 75 degrees F (24 degrees C) unconfined compressive strengths by approximately 25 percent. We, therefore, recommend that a 72-h (3 days is more convenient for laboratory scheduling than 65 h) accelerated-curing sequence at 105 degrees F (41 degrees C) be employed when the Thompson procedure is used for Southeastern soils. (Author)

• Record URL:
  • http://onlinepubs.trb.org/Onlinepubs/trr/1982/839/839-004.pdf
• Summary URL:
  • http://scholar.google.com/scholar_lookup?title=LIME-SOIL+MIXTURE+DESIGN+CONSIDERATIONS+FOR+SOILS+OF+SOUTHEASTERN+UNITED+STATES&author=L.+Lockett&author=R.+Moore&publication_year=1982
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• Supplemental Notes:
  • Publication of this paper sponsored by Committee on Lime and Lime-Fly Ash Stabilization. Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved.
• Authors:
  • Lockett, Larry W
  • Moore, Raymond K
• Conference:
  • 61st Annual Meeting of the Transportation Research Board
  • Location: Washington District of Columbia, United States
  • Date: 1982-1-18 to 1982-1-22
• Publication Date: 1982

Media Info

• Media Type: Digital/other
• Features: Figures; References; Tables;
• Pagination: pp 20-25
• Monograph Title: Soil stabilization 1982
• Serial:
  • Transportation Research Record
  • Issue Number: 839
  • Publisher: Transportation Research Board
  • ISSN: 0361-1981

Subject/Index Terms

• TRT Terms: Calcium oxide; Clay; Concrete curing; Mix design; Moisture content; Montmorillonite; Plastic limit; Soil compaction; Soils
• Uncontrolled Terms: Unconfined compression
• Subject Areas: Geotechnology; Highways; Materials; I33: Other Materials used in Pavement Layers;

Filing Info

• Accession Number: 00362348
• Record Type: Publication
• ISBN: 0309033160
• Files: TRIS, TRB
• Created Date: Nov 30 1982 12:00AM