ROADWAY FAILURE STUDY NO 1

EXPANSIVE CLAY SOILS WERE INVESTIGATED BY DETERMINATION OF WATER INFILTRATING A TYPICAL EXPANSIVE CLAY SUBGRADE, INCLUDING MOISTURE CONTENT, DENSITY, AND SURFACE ELEVATION CHANGES FOR SELECTED BITUMINOUS PAVEMENT SECTIONS. EVALUATION WAS CONDUCTED OF CHEMICAL SOIL STABILIZATION METHODS, INCLUDING TYPES OF STABILIZATION, DEPTH TO WHICH STABILIZATION IS NEEDED AND METHODS OF INJECTING THE CHEMICAL STABILIZER INTO UNDISTURBED SOIL. TWO ADJACENT SECTIONS OF I-25 ON THE CODY SHALE FORMATION WERE STUDIED, EACH HAVING AN ASPHALT-TREATED BASE COURSE ON A VARIABLE THICKNESS OF SELECT-MATERIAL SUBBASE, BUT ONE SECTION HAVING A PLASTIC MEMBRANE WITHIN THE SUBBASE. SOIL SAMPLING AND NUCLEAR MEASUREMENTS SHOWED THAT BENTONITE LENSES HAD A HIGHER MOISTURE CONTENT THAN THE SHALEY CLAY AND THAT WATER MOVED THROUGH THESE LENSES. SINCE THERE WAS PRACTICALLY NO CHANGE IN MOISTURE CONTENT AND DENSITY DURING THE FALL AND WINTER MONTHS, IT WAS CONCLUDED THAT OBSERVATIONS WERE NEEDED OVER A LONGER PERIOD OF TIME. LABORATORY TESTS WERE CONDUCTED ON A BULK SAMPLE OF THE CLAY FOR STABILIZATION OF THE SWELLING CHARACTERISTICS AND A DETERMINATION OF LIME MIGRATION. WATERPROOFING AGENTS WERE USED AND THOSE WITHOUT LIME WERE FOUND INEFFECTIVE IN REDUCING SWELL. LABORATORY TESTS ON IN-PLACE STABILIZATION WITH LIME UTILIZED SLURRIES OF TWO LIMES WITH HYDROSTATIC PRESSURE, APPLIED PRESSURE AND ELECTRIC CURRENT TO FORCE LIME MIGRATION. THERE WAS NO LIME MOVEMENT. WITH 75 PSI PRESSURE, WATER MOVEMENT OCCURRED BUT NO LIME WAS DETECTED AT 1/2 INCH FROM THE SOIL-SLURRY INTERFACE. THE RELATIONSHIP BETWEEN OVERBURDEN PRESSURE AND VOLUME CHANGE OF AN EXPANSIVE CLAY WAS DETERMINED. LATERAL CRACKING OF ASPHALTIC CONCRETE PAVEMENTS ON UNTREATED BASE COURSES IN WYOMING WAS INVESTIGATED. BASIC STRESS-RESPONSIVE PROPERTIES OF PAVEMENT MIXTURES WERE DETERMINED FROM SAMPLES OBTAINED FROM FOUR BITUMINOUS PAVEMENTS. IT WAS CONCLUDED THAT THERMAL STRESSES ARE ORIENTED IN SUCH A MANNER AS TO CAUSE LATERAL CRACKING AND THAT SUCH CRACKING IS NOT DUE TO SUPERIMPOSED LOADING.

  • Supplemental Notes:
    • Final ReporT
  • Corporate Authors:

    University of Wyoming, Laramie

    Natural Resources Research Institute
    Laramie, WY  USA  82071
  • Authors:
    • Lamb, D R
    • SCOTT, W G
    • Gietz, R H
    • PAVLOVICH, R D
  • Publication Date: 1966-8

Subject/Index Terms

Filing Info

  • Accession Number: 00206296
  • Record Type: Publication
  • Source Agency: Bureau of Public Roads /US
  • Files: TRIS
  • Created Date: Sep 15 1994 12:00AM