INVESTIGATE USE OF LIME FOR TREATING CLAY SOIL FOR USE AS A BASE UNDER ASPHALT CONCRETE SURFACING

THIS REPORT DESCRIBES THE CONSTRUCTION AND EVALUATION OF A TEST ROAD IN YOLO COUNTY, CALIFORNIA, WHICH WAS CONSTRUCTED UTILIZING THE NATIVE CLAY SOILS TREATED WITH LIME FOR BASE AND SUBBASE UNDER ASPHALT CONCRETE SURFACING. THREE STRUCTURAL SECTIONS WERE STUDIED; (1) 5 IN. LIME-TREATED BASE (MIN. 72 R-VALUE) WITH 10 IN. LIME TREATED SUBBASE (MIN. 60 R-VALUE), (2) 6 IN. AGGREGATE BASE (MIN. 78 R- VALUE) WITH 12 IN. LIME TREATED SUBBASE (MIN. 60 R-VALUE), AND (3) 6 IN. AGGREGATE BASE (MIN. 78 R-VALUE) WITH 15 IN. AGGREGATE SUBBASE (MIN. 60 R-VALUE). ALL SECTIONS WERE SURFACED WITH 2 IN. OF ASPHALT CONCRETE. PERFORMANCE OF THE EXPERIMENTAL SECTIONS WAS EVALUATED BY BENKELMAN BEAM DEFLECTION MEASUREMENTS AND VISUAL OBSERVATIONS. AFTER 1 1/2 YEARS OF SERVICE, STRUCTURAL SECTIONS (2) AND (3) APPEAR TO BE IN EXCELLENT CONDITION, SECTION (1) HAS PATCHED AREAS REPRESENTING ABOUT 2 PERCENT OF THE ROADWAY AREA. AVERAGE DEFLECTION MEASUREMENTS DECREASED FOR ALL SECTIONS OVER THE 1 1/2 YEAR PERIOD. LABORATORY TESTS OF LIME TREATED SOILS INDICATE THAT MIXING MOISTURE OVER OPTIMUM AND LOOSE CURING UNDER 24 HOURS MINIMIZED CRACKING CAUSED BY CONTRACTION AND EXPANSION. THE AUTHORS INDICATE THAT CONSIDERABLE EFFORT SHOULD BE MADE TO PREVENT DRYING OF LIME-SOIL MIXTURES DURING AND AFTER MIXING. /AUTHOR/

  • Supplemental Notes:
    • Hpr-1(5), D-2-5
  • Corporate Authors:

    California Division of Highways

    Bridge Department
    Sacramento, CA  USA  05914
  • Authors:
    • Zube, E
    • GATES, C
    • Hatano, M
  • Publication Date: 0

Subject/Index Terms

Filing Info

  • Accession Number: 00230629
  • Record Type: Publication
  • Source Agency: Bureau of Public Roads /US
  • Files: TRIS
  • Created Date: Aug 15 2004 2:19AM