EFFECT OF PORTLAND CEMENT TREATMENT OF CRUSHED STONE BASE MATERIALS AS OBSERVED FROM TRIAXIAL SHEAR TESTS

THE OBSERVATION AND EVALUATION OF A NUMBER OF FACTORS AFFECTING THE OVERALL STABILITY OF THREE CRUSHED LIMESTONES WAS UNDERTAKEN WHEN TREATED WITH SMALL AMOUNTS OF TYPE I PORTLAND CEMENT. CONSOLIDATED-UNDRAINED TRIAXIAL SHEAR WITH PORE PRESSURE AND VOLUME CHANGE WAS THE PRIMARY TEST METHOD UTILIZED IN THE STUDY. IT WAS OBSERVED THAT USE OF SHEAR STRENGTH ONLY, OR THE SHEAR PARAMETERS OF COHESION AND FRICTION ONLY, MAY NOT BE FULLY ADEQUATE CRITERIA FOR DETERMINATION OF STABILITY OF CEMENT-TREATED GRANULAR MATERIALS. INSTEAD, IT MIGHT BE SUGGESTED THAT OVERALL STABILITY BE EVALUATED IN TERMS OF SHEAR STRENGTH, STRESS- STRAIN, STRESS-VOLUME CHANGE, AND PORE PRESSURE RELATIONSHIPS AS DETERMINED AT A FAILURE CONDITION OF MAXIMUM VOLUME CHANGE (MAXIMUM VOLUME DECREASE DURING TRIAXIAL TESTING). UP TO 3 PERCENT CEMENT TREATMENT, BY DRY WEIGHT, PRODUCED THE FOLLOWING OBSERVATIONS: (1) VARYING VALUES OF THE SHEAR PARAMETERS WITH INCREASING CEMENT CONTENT WITH MANNER OF VARIATIONS DIFFERING FOR EACH OF THE MATERIALS TESTED, (2) REDUCED PORE WATER PRESSURE TO INSIGNIFICANT QUANTITIES, (3) REDUCED MAGNITUDE OF VERTICAL STRAIN REQUIRED TO ACHIEVE ULTIMATE STRENGTH AS COMPARED WITH THE UNTREATED MATERIALS. MAGNITUDE OF VERTICAL STRAIN APPEARED RELATIVELY INDEPENDENT OF CONFINING PRESSURES BUT DECREASED WITH INCREASING CEMENT CONTENT AND CURE PERIOD,AND (4) ANALYSIS OF VOLUME CHANGE AS RELATED TO STRESS-STRAIN CHARACTERISTICS AT A FAILURE CONDITION OF MAXIMUM VOLUME DECREASE MAY MORE FULLY EXPLAIN THE BEHAVIOR OF UNTREATED AND TREATED GRANULAR MATERIALS UNDER ACTUAL FIELD CONDITIONS. IT IS SUGGESTED THAT STABILITY MUST ALSO BE A DEVELOPED WITHIN A GRANULAR MATERIAL AND THE AMOUNT OF EXPANSION REQUIRED TO ACHIEVE THIS SUPPORT. ADDITION OF CEMENT TO THE THREE CRUSHED STONE MATERIALS REDUCED THE AMOUNT OF LATERAL STRAIN DEVELOPED UP TO THE MINIMUM VOLUME FAILURE CRITERIA, RESULTING IN A POTENTIAL POISSON'S RATIO OF NEAR ZERO. /AUTHOR/

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  • Supplemental Notes:
    • Paper sponsored by Committee on Soil-Portland Cement Stabilization and presented at the 47th Annual Meeting. Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved
  • Authors:
    • FERGUSON, E G
    • Hoover, J M
  • Publication Date: 1968

Language

  • English

Media Info

  • Media Type: Print
  • Features: Figures; References; Tables;
  • Pagination: pp 1-15
  • Monograph Title: Soil-cement
  • Serial:

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Filing Info

  • Accession Number: 00232604
  • Record Type: Publication
  • Files: TRIS, TRB
  • Created Date: Aug 15 2004 2:44AM