What are the three main dimensions of the slump cone?

Top internal diameter: 100 mm, Bottom internal diameter: 200 mm, Height: 300 mm (Clause 3.1).

What are the dimensions of the tamping rod?

It shall be a 16 mm diameter steel bar, 600 mm long, with one or both ends rounded to a hemispherical tip (Clause 4.1).

What is the minimum thickness for the slump cone's metal sheet?

The mould shall be made from a metal sheet of not less than 1.6 mm thickness (Clause 2.1).

Which code describes the method of performing the slump test using this apparatus?

IS 1199 - Methods of sampling and analysis of concrete.

IS 7320

: 1974

Specification for concrete slump test apparatus

CurrentEssentialSpecificationMaterials Science · Cement, Concrete, Aggregates and RCC

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This standard specifies the material, dimensions, and constructional details for the apparatus used in the concrete slump test. It covers the slump cone (mould) and the tamping rod, ensuring uniformity and accuracy in testing the workability of fresh concrete.

Specification for concrete slump test apparatus

Quick Reference Values

Mould top internal diameter100 ± 2 mm

Mould bottom internal diameter200 ± 2 mm

Mould height300 ± 2 mm

Mould metal sheet minimum thickness1.6 mm

Tamping rod diameter16 ± 1 mm

Tamping rod length600 ± 5 mm

Practical Notes

Ensure the cone is not dented or deformed, as this will affect the slump value. The internal surface must be smooth and clean before each test.

The tamping rod should have a hemispherical or bullet-nosed end as specified, not a flat or sharp end, to avoid puncturing the concrete mass.

Verify that the apparatus carries the ISI Certification Mark as per Clause 5, which ensures it meets the specified dimensions and quality.