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- W568705444 abstract "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/" @default.
- W568705444 created "2016-06-24" @default.
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- W568705444 date "1957-01-01" @default.
- W568705444 modified "2023-09-28" @default.
- W568705444 title "A STUDY OF IN-PLACE DENSITY DETERMINATIONS FOR BASE COURSES AND SOILS" @default.
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