Aim: To determine the Field density of Fine grained soil by using Core-cutter (It is less accurate than sand Replacement Method and recommended for well compacted soils.
Apparatus: Core cutter / Dolly / Rammer Balance of 1 g accuracy, Pallet knife, Straight edge, Steel rule, Pick axe etc.
Soil Sample: Soil sample is termed as fine-grained if 90% by weight is passes through IS sieve 4.75 mm.
Often problem encountered when soil mass is dry and cutter is not properly filled up or loose soil while handling. In such case test is to be done by sprinkling water and testing after suitable lapse of time. Core cutter shall be removed, trimmed and kept in polythene bag to take it to laboratory. It shall be weighed with cutter and any loose soil mass collected in bag.
Bulk Density Yb of Wet Soil is as below: Yb = (Ws â Wc) / Vc, gm /cm3
Yd = 100 Yb / (100 + w), gm /cm3 Where w = Water content %
Dry Density to be recorded to 2nd place of decimal in gm/cm3 Water Content % to two significant figures (e.g.- 2.3, 2.3, 0.23).
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