DEVELOPMENT OF APPROPRIATE METHODS FOR EVALUATING THE EFFECTIVENESS OF STABILIZING AGENTS

A SUMMARY IS PRESENTED OF A STUDY TO IMPROVE EXISTING METHODS OR DEVELOP NEW METHODS FOR MEASURING THE PERFORMANCE UNDER IN-SERVICE CONDITIONS OF STABILIZED MATERIALS USED IN DESIGN AND CONSTRUCTION OF HIGHWAYS. TYPE I PORTLAND CEMENT WAS SELECTED AS A NONVISCOUS STABILIZING AGENT FOR ONE PART OF THE INVESTIGATION, AND A PENETRATION-GRADE ASPHALT AS A REPRESENTATIVE VISCOUS STABILIZING AGENT FOR THE OTHER PART OF THE STUDY. LABORATORY EXPERIMENTS WERE CONDUCTED ON SEVEN SOILS TO EVALUATE VARIOUS APPROACHES TO THE MEASUREMENT OF THE CHARACTERISTICS OF STABILIZED MATERIALS, FOLLOWED BY A LIMITED AMOUNT OF TEST TRACK STUDY FOR THE PURPOSE OR CORRELATING LABORATORY RESULTS WITH BEHAVIOR OF MODEL PAVEMENTS. THE PROGRAM WAS DESIGNED TO EVALUATE AND DEVELOP TEST PROCEDURES WHICH WILL PRODUCE DEFINITIVE DATA FOR A WIDE RANGE OF MATERIALS HAVING SIMILAR CHARACTERISTICS. FINDINGS FROM THE STUDY ON NONVISCOUS-STABILIZED MATERIALS INDICATE THAT: (1) MINOR VARIATIONS IN THE RELATIVE DENSITY OF THE MATERIALS WILL HAVE A SIGNIFICANT INFLUENCE ON MANY OF THE PHYSICAL PROPERTIES OF THESE MATERIALS, (2) FINE GRAINED SOILS SHOW LARGE VOLUME CHANGE CHARACTERISTICS BOTH WHEN FROZEN AND THAWED IN THE PRESENCE OF FREE WATER AND UNDER VERY LOW HUMIDITY CONDITIONS, (3) SOME MATERIALS LOSE SIGNIFICANT STRENGTH WHEN SUBJECTED TO FREEZE-THAW CYCLES EVEN THOUGH THESE MATERIALS SHOWED LITTLE OR NO LOSS DURING THE STANDARD FREEZE-THAW DURABILITY TEST, AND (4) THE FLEXURAL STRENGTH OF NON-VISCOUS MATERIALS CAN BE ESTIMATED FROM THE COMPRESSIVE STRENGTH TEST, BUT A RELATIVELY LARGE NUMBER OF TESTS ARE NECESSARY TO OBTAIN A REALISTIC ESTIMATE. CREEP STRAIN TEST RESULTS WERE COVERTED FROM THE TIME DOMAIN TO THE FREQUENCY DOMAIN BY THE USE OF FOURIER TRANSFORM. THIS PERMITTED A DETERMINATION OF THE DYNAMIC RESPONSE OF THESE MATERIALS UNDER LOAD FOR THE ENTIRE FREQUENCY RANGE WITH ONLY A SINGLE TEST. MINOR VARIATIONS IN THE TEMPERATURE AT THE TIME OF THE TEST CAUSED SUBSTANTIAL CHANGES IN THE STIFFNESS OF THE MIXTURES.

  • Availability:
  • Supplemental Notes:
    • Summary of PROGRESS-JUNE 30, 1968, PROJ 4-1, PP 76-84, 7 FIG,
  • Authors:
    • Barenberg, E J
  • Publication Date: 1968

Language

  • English

Media Info

  • Serial:
    • NCHRP Report
    • Publisher: Transportation Research Board
    • ISSN: 0077-5614
  • Publication flags:

    Open Access (libre)

Subject/Index Terms

Filing Info

  • Accession Number: 00232511
  • Record Type: Publication
  • Files: TRIS, TRB
  • Created Date: Aug 15 2004 2:43AM