This test is done to determine the in-situ dry density of soil by core cutter method as per IS: 2720 (Part XXIX) – 1975.The apparatus needed for this test is
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 Determine The In-Situ Dry Density Of Soil By Core Cutter Method
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
Bulk density of the soil g cc Y = [W2 – W1]/ V g/cc
Dry density of the soil g cc Yd = 100Y/[100+w] g/cc
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 below
If you have a query, you can ask a question here.
What is the nos of core to be taken of 1000 sq.m in case of circular area and in case of rectangular area ( of width 5m ,length 200m) for testing sand compaction of 200 mm thk. Layer?
every 500m2 = 1 point of test~
where it is mention (Any IS, CPWD) ? every 500m2 = 1 point of test
Core recovery should be not less than 25%.Not understood.Please comment
SHOW THE FULL PROCEDURE FOR TESTING OF SOIL BY CORE CUTTER METHOD WITH NESSESARY PICTURE
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Every 1000 m2 10 nos. points required for density test (Compaction Test)
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Thanks for your educative presentation, the insitu density of soil procedure contain in this page is found to be useful.thanks allot.
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