A RAPID FIELD METHOD FOR DETERMINING CEMENT CONTENT OF PLASTIC CEMENT-TREATED BASE

A METHOD FOR DETERMINING THE CEMENT CONTENT OF FRESHLY- MIXED CEMENT-TREATED BASE BY MEANS OF AN ELECTRICAL CONDUCTIVITY CELL IS DESCRIBED. THE PROCEDURE, DEVELOPED ORIGINALLY TO CHECK UNIFORMITY OF CEMENT DISTRIBUTION IN ROAD-MIXED CEMENT-TREATED BASE MIXTURES, IS NOW BEING USED FOR CONTROL OF CEMENT PERCENTAGES IN PLANT-MIX PRODUCTION OF CEMENT-TREATED BASE. THE METHOD IS BASED ON THE RESULTANT CHANGE IN THE ELECTRICAL CONDUCTIVITY OF WATER WHEN SMALL QUANTITIES OF CEMENT ARE ADDED. A CALIBRATION CURVE IS FIRST CONSTRUCTED BY MEASURING THE CONDUCTIVITY OF SOLUTIONS PREPARED BY ADDING ONE QUART OF WATER TO SMALL BATCHES OF AGGREGATES CONTAINING KNOWN QUANTITIES OF CEMENT. SAMPLES OF PLANT-MIXED TREATED MATERIAL ARE THEN PROCURED AND THEIR ELECTRICAL CONDUCTIVITY DETERMINED BY THE SAME PROCEDURE. THE AMOUNT OF CEMENT IN THE SAMPLE IS THEN DETERMINED FROM THE CALIBRATION CURVE. THIS AMOUNT, TOGETHER WITH THE INITIAL SAMPLE WEIGHT AND MOISTURE CONTENT, IS THEN USED TO CALCULATE THE CEMENT CONTENT OF THE MIXTURE. CEMENT CONTENTS, BASED ON THE AVERAGE OF RESULTS ON THREE SAMPLES, ARE AVAILABLE IN 20 TO 25 MIN FROM TIME OF SAMPLING. A BRIEF DESCRIPTION OF THE DEVELOPMENT OF THE TEST PROCEDURE, A DETAILED DESCRIPTION OF THE PROCEDURE AND ITS USE BY FIELD FORCES, ILLUSTRATIONS OF TEST APPARATUS AND DATA SHEETS, AND A COMPARISON OF TEST RESULTS WITH ACTUAL YIELD FIGURES FROM SEVERAL JOBS, ARE PRESENTED. /AUTHOR/

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  • Supplemental Notes:
    • No 267, pp 1-13, 3 FIG, 2 TAB, 2 REF, 1 APP 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:
    • LeClerc, Roger V
    • Sandahl, Henry E
  • Publication Date: 1960

Media Info

  • Monograph Title: Soil stabilization by admixing Portland cement
  • Serial:

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Filing Info

  • Accession Number: 00213200
  • Record Type: Publication
  • Files: TRIS, TRB
  • Created Date: Aug 12 1994 12:00AM