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Title:

RUBBER-BALLOON APPARATUS FOR MEASURING DENSITIES OF SOIL IN PLACE

Accession Number:

00229550

Record Type:

Component

Abstract:

DETERMINATIONS OF IN-PLACE DENSITIES OF SOILS ARE COMMONLY ACCOMPLISHED IN ENGINEERING PRACTICE BY AUGERING OR DIGGING A HOLE, WEIGHING AND DETERMINING THE MOISTURE CONTENT OF THE SOIL FROM THE HOLE, AND MEASURING THE VOLUME OF THE HOLE. THE VOLUME MAY BE MEASURED BY THE OIL METHOD, BY THE SAND- CONE METHOD, OR BY A RUBBER-BALLOON APPARATUS. THE RUBBER-BALLOON METHOD HAS BEEN DEMONSTRATED TO BE ACCURATE AND IS NOW WIDELY ACCEPTED. VARIOUS KINDS OF COMMERCIALLY AVAILABLE APPARATUS HAVE BEEN DESIGNED ESPECIALLY FOR MEASUREMENTS OF DENSITIES OF SUBGRADES, BASES, AND COMPACTED EARTH FILLS. THESE ARE LIMITED TO USE ON FAIRLY LEVEL SURFACES. WORK IN IOWA ON NATURAL SOILS SHOWED A NEED FOR AN APPARATUS WHICH COULD BE USED EITHER ON LEVEL, SLOPING, OR VERTICAL FACES. WITH SUCH AN APPARATUS, MEASUREMENTS COULD BE MADE IN ROADCUTS, IN QUARRY FACES, IN BORROW PITS, IN BASEMENT EXCAVATIONS, AND IN OTHER LIKE PLACES DEEP IN THE SOIL SECTION. ADDITIONAL REQUIREMENTS FOR THE DESIGN OF THE APPARATUS WERE THAT IT BE RUGGED ENOUGH TO WITHSTAND ROUGH FIELD USAGE AND LIGHT AND COMPACT ENOUGH FOR USE BY A MAN SUSPENDED FROM A ROPE OVER A ROADCUT OR QUARRY WALL. A NEW RUBBER-BALLOON APPARATUS WAS DEVELOPED TO MEET THESE REQUIREMENTS. AS A RESULT OF 2 YEARS OF USE OF THE NEW APPARATUS IN THE UNITED STATES AND ALASKA, VARIOUS MODIFICATIONS AND IMPROVEMENTS HAVE BEEN MADE. THE PAPER DESCRIBES THE APPARATUS AND PRESENTS REPRESENTATIVE TEST DATA. /AUTHOR/

Supplemental Notes:

No 122, pp 13-22, 6 FIG, 5 REF, 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.

Authors:

Handy, R L
Davidson, D T

Pagination:

10p

Publication Date:

1956

Serial:

Highway Research Board Bulletin

Issue Number: 122
Publisher: Highway Research Board

Media Type:

Digital/other

Old TRIS Terms:

Subject Areas:

Geotechnology; Highways

Files:

TRIS, TRB

Created Date:

Sep 1 1968 12:00AM