CONTROL OF VOLUME CHANGES IN EXPANSIVE EARTH MATERIALS

METHODS FOR THE CONTROL OF VOLUME CHANGES IN EXPANSIVE SOILS HAVE BEEN DIVIDED INTO (1) TECHNIQUES THAT DO NOT REQUIRE ADDITIVES: COMPACTION CONTROL, PREWETTING, HEATING; AND (2) TECHNIQUES USING ADDITIVES: LIME, CEMENT, CHEMICALS. MUCH CAN BE DONE THROUGH CONTROL OF COMPACTION. A MODERATE DENSITY WET OF OPTIMUM WATER CONTENT USING A SHEEPSFOOT ROLLER SHOULD MINIMIZE SWELL, AND CURRENT KNOWLEDGE OF THE PROPERTIES OF COMPACTED CLAY SHOULD ENABLE DESIGNS ACCOUNTING FOR STRENGTH, VOLUME CHANGE, AND PERMEABILITY CRITERIA. PREWETTING IS AN EFFECTIVE MANS OF VOLUME CHANGE CONTROL WHEN TIME IS NOT CRITICAL. LIME TREATMENT OF THE UPPER 6 TO 12 INCHES OF THE WETTED SOIL CAN BE USED TO INCREASE STRENGTH AND FACILITATE CONSTRUCTION. LIME CONTINUES TO BE THE MOST EFFECTIVE ADDITIVE FOR STABILIZATION, AND THE DEEP- PLOW METHOD PROVIDES MEANS FOR TREATMENT TO DEPTHS UP TO 36 INCHES. ON THE OTHER HAND STABILIZATION USING LIME SLURRIES AND LIME PILES IS OF DOUBTFUL VALUE, EXCEPT IN DRIED, FISSURED MATERIALS. NO CHEMICALS HAVE BEEN FOUND THAT ARE COMPETITIVE WITH LIME FOR TREATMENT OF EXPANSIVE CLAYS. PROPRIETARY CHEMICAL STABILIZERS AND COMPACTION AIDS HAVE NOT YET BEEN SHOWN EFFECTIVE FOR CONTROL OF VOLUME CHANGE.

  • Supplemental Notes:
    • Proceedings, Workshop on Expansive Clays and Shales in Highway Design and Construction, Denver, Colorado, 1972. Available in 2 volumes from NTIS, PB-225842.
  • Corporate Authors:

    University of Wyoming, Laramie

    Wyoming Survey and Analysis Center, 710 Garfield
    Laramie, WY  United States  82070
  • Authors:
    • Mitchell, T K
    • Raad, L
  • Publication Date: 1973-5

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00233512
  • Record Type: Publication
  • Report/Paper Numbers: Workshop Proceedings
  • Files: TRIS
  • Created Date: Jul 31 1974 12:00AM