What is the standard size of the consolidation ring?

The standard internal diameter is 60 mm and the height is 20 mm, giving a diameter to height ratio of 3 (Clause 4.1.1).

What is the purpose of the porous stones?

To permit free drainage of water from the top and bottom of the soil specimen during consolidation (Clause 4.2).

What is the required loading capacity of the device?

The device must be capable of applying a stress of at least 10 kg/cm² (approx. 1000 kPa) on the specimen (Clause 5.1).

Which IS code specifies the test procedure using this apparatus?

IS 2720 (Part 15) specifies the method for determination of consolidation properties of soil.

IS 12287

: 1988

consolidometer for determination of consolidation properties

CurrentFrequently UsedSpecificationGeotechnical · Soil and Foundation Engineering

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This standard specifies the requirements for the apparatus, known as a consolidometer or oedometer, used for determining the consolidation properties of soil. It covers the material, dimensions, and construction of components like the consolidation ring, porous stones, and the loading device to ensure accurate and repeatable soil testing.

consolidometer for determination of consolidation properties

Quick Reference Values

Standard internal diameter of consolidation ring60 mm

Standard height of consolidation ring20 mm

Standard thickness of porous stones12 mm

Minimum loading capacity of apparatus10 kg/cm²

Minimum permeability of porous stones10 times the permeability of the soil being tested

Dial gauge least count0.002 mm

Practical Notes

Ensure porous stones are fully saturated before starting the test to prevent air from being trapped in the specimen.

The cutting edge of the consolidation ring must be kept sharp to minimize sample disturbance during trimming.

Regular calibration of the loading device and dial gauge is crucial for accurate results.