To determine the in-situ dry density of soil by core cutter method as per IS: 2720 (Part XXIX) - 1975.
i) Cylindrical core cutter
ii) Steel dolley
iii) Steel rammer
iv) Balance, with an accuracy of 1g
vi) Square metal tray - 300mmx 300mm x 40mm
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 (W 1 ).
iii) A small area, approximately 30cm square of the soil layer to be tested should be exposed and levelled. The steeldolly 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 notto rock the cutter. The cuttershould then be dug out of thesurrounding 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 (W 2 ).
v) The soil core should be removed from the cutter and a representative sample should be placed in an air-tightcontainer and its water content (w) determined as in Para
REPORTING OF RESULTS
Bulk density of the soil γ =(W 2 -W 1 )/V g/cc
Dry density of the soil γ d = 100γ/(100+w) g/cc
Average of at least three determinations should be reported to the second place of decimal in g/cc.
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