|Experiment No. 8: Soil In-Situ Density||
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Core Cutter Method
Sand Replacement Method
2. First determine the bulk density of the sand to be used in the field. For this, measure the internal dimensions of the calibrating cylinder so as to obtain its volume. Fill the pouring cylinder with sand and weigh. Place it concentrically on top of the calibrating cylinder, and allow sand to run out and fill both the calibrating cylinder and the inverted conical portion.
3. To obtain only the mass of sand filling up the conical portion, lift the pouring cylinder and then weigh with remaining sand. Place it on a glass plate, and allow sand to run out. Weigh again the pouring cylinder with left over sand.
4. Calculate the mass of sand that fills up the calibrating cylinder, and from its known volume, work out the bulk density of the sand for the allowed free fall.
5. Clean and level the site surface, and place the square tray with a central hole. Excavate a hole of diameter equal to that of the tray hole and depth equal to about 15 cm. Collect the excavated soil in the tray, weigh and then take representative samples for water content determination.
6. Fill the pouring cylinder with the same sand, place it concentrically over the hole, open the shutter and allow sand to fill up the hole.
7. When there is no further movement of sand, close the shutter, remove the cylinder and weigh it with the remaining sand.