What is the standard volume of the permeability mould specified in IS 11209?

The standard volume is 1000 ± 1 cm³ (Clause 4.2).

What is the internal diameter of the mould?

The internal diameter of the mould body is specified as 100.0 ± 0.1 mm (Clause 4.2).

What materials are specified for the porous discs?

The discs can be made of silicon carbide, aluminium oxide, or a suitable porous metal (Clause 3.2).

Which test method uses the apparatus specified in IS 11209?

This mould assembly is designed for use with the test method for determination of permeability as described in IS 2720 (Part 17).

IS 11209

: 1985

mould assembly for determination of permeability of soils

CurrentSpecializedSpecificationGeotechnical · Soil and Foundation Engineering

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This standard specifies the material, dimensional, and constructional requirements for the mould assembly used in laboratories for determining the coefficient of permeability of soils. It ensures uniformity and accuracy of the apparatus used in conjunction with the test method outlined in IS 2720 (Part 17).

mould assembly for determination of permeability of soils

Quick Reference Values

Internal diameter of mould100.0 ± 0.1 mm

Internal effective height of mould127.3 ± 0.1 mm

Mould volume1000 ± 1 cm³

Diameter of porous discs98.5 ± 0.5 mm

Thickness of porous discs12.7 mm

Mould cylinder wall thicknessNot less than 5 mm

Practical Notes

This mould is for a constant head or falling head permeability test. The test procedure itself is detailed in IS 2720 (Part 17).

Ensure O-rings and gaskets are in good condition to prevent leakage, which is a major source of error in permeability tests.

The porous discs must be fully saturated prior to testing to avoid air bubbles affecting the results.