What is the specified height of drop for the flow table?

The table must have a free fall (drop) of 12.5 ± 0.5 mm as per Clause 3.1.

What is the total mass of the dropping parts of the apparatus?

The combined mass of the table top and the shaft must be 4.1 ± 0.05 kg according to Clause 3.1.

What are the internal dimensions of the conical mould?

The mould has a top internal diameter of 70 mm, a bottom internal diameter of 100 mm, and a height of 50 mm, with a tolerance of ±0.5 mm for each (Clause 4.1).

In which other test method standards is the flow table from IS 5512 used?

It is primarily used in tests described in IS 4031 (Part 7) for masonry cement and IS 1727 for pozzolanic materials.

IS 5512

: 1983

Specification for flow table for use in tests of hydraulic cement and pozzolanic materials

CurrentSpecializedSpecificationMaterials Science · Cement, Concrete, Aggregates and RCC

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This standard specifies the requirements for the flow table apparatus and its accessories (mould and tamper). It is used for determining the consistency (flow) of hydraulic cements, pozzolanic materials, and masonry cement mortars. The specification covers the material, construction, dimensional tolerances, and mass to ensure uniformity and repeatability of test results across different laboratories.

Specification for flow table for use in tests of hydraulic cement and pozzolanic materials

Quick Reference Values

Diameter of table top250 ± 2.5 mm

Height of drop12.5 ± 0.5 mm

Mass of table top and shaft4.1 ± 0.05 kg

Mould top internal diameter70 ± 0.5 mm

Mould bottom internal diameter100 ± 0.5 mm

Mould height50 ± 0.5 mm

Frequency of drop1 per second

Practical Notes

The flow table must be installed on a heavy, rigid, and level concrete base to prevent any movement or vibration during operation.

Regularly verify the height of drop (12.5 mm) and ensure the cam and shaft are clean to allow a free, unobstructed fall.

The specified rate of 1 drop per second is critical for test consistency and should be maintained accurately, whether using a manual handle or a motorized unit.