Which of the following method is used to determine in-situ density of soil?

I. Sand replacement method

II. Core cutter method

Question

Question

This question was previously asked in

HPCL Engineer Civil 23 Dec 2023 Official Paper

Answer 1

Explanation:

Methods to determine the in situ density of soil:

1) Core cutter method:

2) Sand replacement method:

3) Water displacement method:

4) Rubber ballon method:

This volume of the pit is measured by covering the pit with a plastic sheet and then filling it with water.
Thus the weight of water calculated is equal to the volume of soil excavated.

5) Radiation method:

Additional Information

Methods used for finding water content:

Method	Properties
Oven drying method	Most accurate method and is a standard laboratory method
Pycnometer method	More suitable for cohesionless soil as removal of entrapped air from cohesive soil difficult.
Sand bath method	It is a rapid method, hence not very accurate
Torsion balance method	Drying and weighing done simultaneously, hence one of the accurate methods
Calcium carbide method	Takes just 5-7 minutes and used as a field test
Alcohol test	It is a quick field test and not used for soils containing calcium or organic compound
Radiation method	Gives water content in an in-situ condition