AIM
To determine the in-situ dry density of soil by core cutter method
as per IS: 2720 (Part XXIX) - 1975.
APPARATUS
CYLINDRICAL CORE CUTTER
i) Cylindrical core cutter
ii) Steel dolley
iii) Steel rammer
iv) Balance, with an accuracy of 1g
v) Straightedge
vi) Square metal tray - 300mm x 300mm x 40mm
vii) Trowel
PROCEDURE
i) The internal volume (V) of the core cutter in cc should be
calculated from its dimensions which should be measured to
the nearest 0.25mm.
ii) The core cutter should be weighed to the nearest gram (W1).
iii) A small area, approximately 30cm square of the soil layer to
be tested should be exposed and levelled. The steel dolly
should be placed on top of the cutter and the latter should
be rammed down vertically into the soil layer until only about
15mm of the dolly protrudes above the surface, care being
taken not to rock the cutter. The cutter should then be dug
out of the surrounding soil, care being taken to allow some
soil to project from the lower end of the cutter. The ends of
the soil core should then be trimmed flat in level with the
ends of the cutter by means of the straightedge.
iv) The cutter containing the soil core should be weighed to the
nearest gram (W2).
v) The soil core should be removed from the cutter and a
representative sample should be placed in an air-tight
container and its water content (w)
REPORTING OF RESULTS
Average of at least three determinations should be reported to
the second place of decimal in g/cc.
A sample proforma for the record of the test results is given in
Annexure-VIII
