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Title:

NEW METHOD FOR MEASURING IN-PLACE DENSITY OF SOILS AND GRANULAR MATERIALS

Accession Number:

00232616

Record Type:

Component

Abstract:

CONVENTIONAL METHODS OF MEASURING THE IN-PLACE DENSITY OF SOILS AND GRANULAR MATERIALS ARE TIME-CONSUMING AND OFTEN TIMES SUBJECT TO CONSIDERABLE ERROR. PRESENTLY USED METHODS, SUCH AS MEASURING VOLUMES BY USE OF OIL OR CALIBRATED SAND, HAVE ONE OR MORE OF THE FOLLOWING SHORT-COMINGS: (1) SUITABLE ONLY FOR APPLICATION TO A SMALL RANGE OF HOLE SIZES, (2) SUBJECT TO CONSIDERABLE ERROR WHEN SURFACE OF GROUND IS ROUGH, (3) ACCURACY AFFECTED BY VIBRATION OR TEMPERATURE, (4) CANNOT READILY CHECK DENSITIES OF SUCCESSIVE LIFTS BY MERELY EXTENDING DEPTH OF SAME HOLE, AND (5) REQUIRE LENGTHY CALCULATIONS AND CORRECTION FACTORS FOR FINAL ANSWER. IN AN ATTEMPT TO OVERCOME THESE DEFICIENCIES, THE WASHINGTON DENSOMETER HAS BEEN DEVELOPED. THE BASIC PRINCIPLE OF THE INSTRUMENT IS THE SAME AS THAT USED IN SOME OTHER METHODS, NAMELY THAT OF INFLATING A RUBBER BALLOON WITH FLUID UNTIL IT FILLS THE EXCAVATED HOLE AND MEASURING THE VOLUME OF THE HOLE BY MEASURING THE AMOUNT OF FLUID SO REQUIRED. HOWEVER, TO THE AUTHORS' KNOWLEDGE, THE APPARATUS IS UNIQUE IN THE METHOD OF APPLICATION OF THIS PRINCIPLE. THE DEVICE USES A CLOSED SYSTEM WITH A CYLINDER AND PISTON TO ACTIVATE INFLATION AND DEFLATION OF THE BALLOON. THIS PERMITS EXTREMELY RAPID OPERATION, PLUS THE DIRECT READING OF VOLUMES IN CUBIC FEET FROM THE CALIBRATED PISTON ROD. BY THE INCLUSION OF KNOWN-VOLUME RINGS, RAPID AND ACCURATE MEASUREMENTS OF HOLES VARYING FROM 0.000 CU. FT. UP TO 0.500 CU. FT. CAN BE MADE. /AUTHOR/

Supplemental Notes:

No 93, pp 49-60, 5 FIG, 2 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.

Monograph Title:

Soil density and stability

Monograph Accession #:

01410498

Language:

English

Authors:

Minor, Carl E
Humphres, Herbert W

Publication Date:

1954

Serial:

Highway Research Board Bulletin

Issue Number: 93
Publisher: Highway Research Board

Media Type:

Digital/other

Old TRIS Terms:

Subject Areas:

Geotechnology; Highways

Files:

TRIS, TRB

Created Date:

Aug 15 2004 2:44AM

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