Sunday, February 9, 2014
Dry density by Core cutter method
Ref : IS 2720 (part XXIX)
Purpose : To find out the dry density of compacted soil in field.
Salient features of apparatus:
![[Image: 9sxbf6.jpg]](http://i41.tinypic.com/9sxbf6.jpg)
a) Dolly : Inner diameter : 100mm
Outer diameter : 115mm
Height : 25mm
b) Cutter : Inner diameter : 100mm
Outer diameter : 106mm
Height : 130mm
c) Rammer : Length : 900mm
Diameter : 140mm
Test Procedure:
1) Find the volume in cm3 and weight of the cutter in gms.
2) Expose about 30 cm2 of ground area and level it.
3) Put the dolly on the top of the core cutter and drive assembly into the soil with the help of the rammer until top of the dolly protrudes about 1.5cm above the surface. Detach the core cutter from the surrounding soil.
4) Trim flat end of the cutter.
5) Keep some representative specimen of soil for moisture content determination.
6) Find out dry density by using the following formula:
Dry density (γd) = γb /(1 + w)
Where
γb = Bulk density.
W = Moisture content.
