A STUDY OF IN-PLACE DENSITY DETERMINATIONS FOR BASE COURSES AND SOILS

STUDY WAS UNDERTAKEN TO DETERMINE THE AMOUNT OF ERROR INHERENT IN SEVERAL METHODS USED BY VARIOUS ORGANIZATIONS FOR MEASURING IN-PLACE DENSITY OF BASE COURSES AND SOILS. FOUR METHODS WERE STUDIED: (1) SAND-DISPLACEMENT, (2) WATER-BALLOON, (3) OIL-DISPLACEMENT, AND (4) DRIVE CYLINDERS. A LABORATORY PROCEDURE WAS DEVISED FOR COMPARING THE ACCURACY OF THE EQUIPMENT UNDER CONTROLLED CONDITIONS, AND FIELD TESTS WERE PERFORMED TO COMPARE THE METHODS UNDER FIELD CONDITIONS. ONLY THE SAND-DISPLACEMENT AND WATER- BALLOON METHODS COULD BE USED IN THE LABORATORY TESSTS. THE TEST RESULTS INDICATED THAT THE EQUIPMENT COULD BE ARRANGED AS FOLLOWS IN ORDER OF DECREASING ACCURACY: SAND-DENSITY CYLINDERS, GLASS JAR AND CONE, WASHINGTON DENS-O-METER, GLASS JAR AND FUNNEL, AND REINHART WATER-BALLOON. IT WAS INDICATED THAT MAXIMUM VARIATIONS FROM THE ACTUAL DENSITY OF ABOUT 1 LB PER CU FT COULD BE EXPECTED FROM THE SAND-DENSITY CYLINDERS AND 9 LB PER CU FT FROM THE REINHART WATER- BALLOON. FIELD TESTS BORE OUT THE LABORATORY TESTS, IN GENERAL, BUT INDICATED THAT A LITTLE LESS ACCURACY COULD BE EXPECTED UNDER FIELD CONDITIONS. THE SAND-DENSITY CYLINDERS SHOWED A MAXIMUM VARIATION FROM THE ACTUAL DENSITY OF SLIGHTLY LESS THAN 3 LB PER CU FT. THE OTHER EQUIPMENT SHOWED SLIGHTLY GREATER OR NO GREATER VARIATIONS THAN THE LABORATORY TESTS HAD INDICATED. THE OIL-DISPLACEMENT METHOD WAS FOUND TO BE GENERALLY UNSATISFACTORY. DRIVE CYLINDERS WERE CNSIDERED STAISFACTORY FOR MOIST CLAYS AND SILTS. /AUTHOR/

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  • Supplemental Notes:
    • No 159, pp 24-40, 8 FIG, 6 TAB, 9 PHOT 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:
    • Redus, J F
  • Publication Date: 1957

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  • Accession Number: 00229200
  • Record Type: Publication
  • Report/Paper Numbers: Proc 1963
  • Files: TRIS, TRB
  • Created Date: Jul 6 1970 12:00AM