LIME STABILIZATION FOR PAVEMENT CONSTRUCTION

RESEARCH CONDUCTED AT THE UNIVERSITY OF ILLINOIS BY DR. JAMES L. EADES IS REPORTED. SCANNING ELECTRON MICROGRAPHS WERE MADE THAT SHOW THE FORMATION AND GROWTH OF THE CALCIUM SILICATE GEL STRUCTURE. PICTURES CAN BE MADE OF FRACTURES PIECES OF LIME-TREADED SOILS WITHOUT SPECIAL PREPARATION OF THE MATERIAL. EXPERIENCE IS USING LIME (I.E., QUICKLIME OR HYDRATED LIME) TO STABILIZE (1) CLAYS; (2) HIGHLY PLASTIC SWELLING SUBGRADE SOILS; AND (3) WET, WEAK NONSWELLING SUBGRADE SOILS IS DISCUSSED. IN THE FIRST CASE, 20 YEARS EXPERIENCE IN TEXAS IS REPORTED. IT IS NOTED THAT DURING THE DROUGHT PERIOD 1951--1957 THE LIME-TREATED LAYER FORMED A MOISTURE BARRIER AND HELPED MAINTAIN A UNIFORM MOISTURE CONDITION BELOW THE STABILIZED LAYER. FOR SWELLING SOILS THE TEXAS HIGHWAY DEPARTMENT HAS DEVELOPED A "POTENTIAL VERTICAL RISE" INDEX THAT ACCOUNTS FOR SOIL TYPE, MOISTURE CONTENT, DENSITY, LAYER THICKNESS, AND SURCHARGE LOAD. WHERE THE PVR EXCEEDS 0.5 INCH, MEASURES MUST BE TAKEN TO INHIBIT SWELLING ACTION. EXPERIMENTS IN TEXAS AND UTAH UTILIZING LIME STABILIZATION FOR SWELLING SOILS ARE DESCRIBED BRIEFLY. IN THE LAST CASE, LIME CAN BE USED TO ADVANTAGE IN PROVIDING AN IMPERVIOUS LAYER OF STABLE MATERIAL. HOWEVER, IT MAY BE NECESSARY TO INCREASE THE LIME-TREATED LAYER TO AS MUCH AS 12 INCHES TO BRIDGE THE UNSTABLE SOIL BELOW. PROCEDURES FOR MINIMIZING SOIL PUMPING ARE DESCRIBED. THE RANGE OF IMPROVEMENT THAT CAN BE EXPECTED FOR A VARIETY OF SOILS IS INDICATED NUMERICALLY IN A TABLE OF CBR AND K VALUES. ON THE BASIS OF LABORATORY AND FIELD EXPERIENCE AASHO STRUCTURAL NUMBERS ARE PROPOSED FOR BASES, SUBBASES, AND SUBGRADES. CEMENT, BITUMINOUS, AND LIME TREATMENTS FOR VARIOUS TRAFFIC LOADS, SUBGRADE SUPPORTS, AND PAVING MATERIALS ARE RECOMMENDED IN A SET OF TABLES. THE BENEFITS GAINED FROM USE OF HYDRATED LIME IN THE WESTERN STATES, NOTABLY ARIZONA AND COLORADO, ARE DISCUSSED AND TABLIFIED.

  • Supplemental Notes:
    • pp 267-287, 1 FIG, 7 TAB, 20 REF
  • Corporate Authors:

    University of New Mexico, Albuquerque

    Seventh Paving Conference Proceedings
    Albuquerque, NM  United States  87131
  • Authors:
    • Kelley, C M
  • Publication Date: 1969

Subject/Index Terms

Filing Info

  • Accession Number: 00233166
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Oct 18 1971 12:00AM