DESIGN COEFFICIENTS FOR LIME-SOIL MIXTURES

TENTATIVE STRENGTH COEFFICIENTS AND MATERIAL REQUIREMENTS AND LIMITATION FOR INCLUSION WERE DEVELOPED FOR THE USE OF THE ACTIVE LIME-STABILIZED-SOIL MIXTURES AS BASE ANS SUBBASE IN THE ILLINOIS FLEXIBLE PAVEMENT STRUCTURAL DESIGN PROCEDURE. A LITERATURE SEARCH REVEALED ONLY A LIMITED AMOUNT OF INFORMATION ON PAVEMENTS ACTUALLY CONSTRUCTED WITH A LIME-STABILIZES SOIL AS AN INTEGRAL PART OF THE PAVEMENT STRUCTURE. HOWEVER, THERE WAS ENOUGH INFORMATION ON IN-SERVICE ROADS TO DEVELOP SOME OPINIONS ON LIME-SOIL STABILIZATION. THE SURVEY INDICATES THAT THICKNESSES OF LIME-STABILIZED SOILS EQUIVALENT TO THOSE OF GRAVEL OR CRUSHED-STONE MATERIALS WILL PROVIDE SIMILAR PAVEMENT PERFORMANCE. INFORMATION FROM THE ILLINOIS HIGHWAY RESEARCH-76 STUDY SUGGEST THAT UNCONFINED COMPRESSIVE STRENGTHS CAN BE USED AS MEANINGFUL MEASURES OF STRENGTH OR STABILITY OF LIME-STABILIZES-SOIL MIXTURES, AND THAT ESTIMATES OF COEFFICIENT VALUES MAY BE MADE BY RELATING THESE COMPRESSIVE STRENGTHS TO THOSE OBTAINED FOR CEMENT-AGGREGATE MIXTURES. THE POZZOLANIC REACTION PRODUCES CEMENTING SIMILAR TO THAT OF CEMENT-TREATED MIXTURES, AND LIME-STABILIZED AND CEMENT-STABILIZED PLASTIC SOILS ARE SIMILAR IN FLEXURAL STRENGTH, MODULUS OF ELASTICITY, FAILURE STRAINS, AND POISSON'S RATIO. THE MAJOR DIFFERENCE IS THAT CEMENT-STABILIZED SOILS GAIN STRENGTH RAPIDLY WHILE LIME-STABILIZES SOILS INCREASE IN STRENGTH AT MUCH SLOWER RATES AND OVER LONGER PERIODS OF TIME. A MINIMUM UNCONFINED COMPRESSIVE STRENGTH OF 150 PSI FOR LIME-STABILIZED SOIL AS A BASE COURSE APPEARS TO BE REALISTIC. INFORMATION OBTAINED FROM PUBLISHED REPORTS ON IN-SERVICE ROADS SUGGEST THAT LIME-STABILIZED SOIL BASE COURSES ARE EQUIVALENT IN PERFORMANCE TO GRANULAR BASE COURSES. THE ILLINOIS FLEXIBLE PAVEMENT DESIGN PROCEDURE CONTAINS MINIMUM THICKNESS AND MATERIAL STRENGTH REQUIREMENTS FOR EACH LAYER OF THE PAVEMENT STRUCTURE WHICH HAVE BEEN ESTABLISHED IN CONSIDERATION OF CONSTRUCTION AND MAINTENANCE PROBLEMS TO AVOID THE POSSIBILITY OF DEVELOPING IMPRACTICAL DESIGNS. SINCE THE RECOMMENDED COEFFICIENT VALUE FOR LIME-STABILIZED SOIL AS SUBBASE IS 0.12, IT IS REASONABLE THAT THIS MATERIAL BE PERMITTED AS SUBBASE WHENEVER A FLEXIBLE PAVEMENT IS INCREASED TO SIX INCHES.

  • Supplemental Notes:
    • Rept No 22, 22 PP, 10 FIG, 9 REF
  • Corporate Authors:

    Illinois Department of Transportation

    Division of Highways, 2300 South Dirksen Parkway
    Springfield, IL  USA  62764
  • Publication Date: 0

Subject/Index Terms

Filing Info

  • Accession Number: 00232828
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Jun 15 1970 12:00AM