What are the two standard mould sizes specified?

A small mould of 2500 cm³ capacity (150mm dia) and a large mould of 15000 cm³ capacity (280mm dia) are specified (Table 1).

When should the large mould be used?

The large mould (15000 cm³) should be used when the maximum particle size of the soil is between 19 mm and 75 mm (Clause 3.1.1).

IS 10837

: 1984

moulds and accessories for determination of density index (relative density) of cohesionless soils

CurrentSpecializedSpecificationGeotechnical · Soil and Foundation Engineering

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This standard specifies the requirements and dimensions for the apparatus, including moulds and accessories, used for determining the density index (relative density) of cohesionless soils in a laboratory. It covers two sizes of moulds for different particle sizes and details the associated equipment like vibrating tables and pouring devices.

moulds and accessories for determination of density index (relative density) of cohesionless soils

Quick Reference Values

Capacity of small mould2500 cm³

Inside diameter of small mould150 mm

Capacity of large mould15000 cm³

Inside diameter of large mould280 mm

Recommended vibrating table frequency50 Hz

Surcharge pressure to be applied140 g/cm² (approx 14 kPa)

Practical Notes

The choice between the 2500 cm³ and 15000 cm³ mould depends on the maximum particle size of the soil sample.

Proper calibration of the vibrating table's frequency and amplitude is crucial for obtaining accurate and repeatable test results.

This standard specifies the equipment; the actual test procedure is detailed in IS 2720 (Part 14).