What is the specified rate of jolting for the apparatus?

The apparatus must provide 60 jolts in 60 seconds (Clause 5.1).

What is the total weight of the moving parts?

The combined mass of the table, mould, and clamps must be 20.0 ± 0.5 kg (Clause 3.1).

What is the specified drop height for each jolt?

The table must drop from a height of 15.0 ± 0.3 mm (Clause 5.1).

For which primary test is this apparatus used?

It is used to prepare compacted mortar cubes for the compressive strength test of cement, as detailed in IS 4031 (Part 6).

IS 10078

: 1982

Specification for jolting apparatus for testing cement

CurrentSpecializedSpecificationMaterials Science · Cement, Concrete, Aggregates and RCC

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This standard specifies the requirements for the design, dimensions, and performance of a jolting apparatus. This apparatus is used to compact standard mortar cube specimens for determining the compressive strength of cement.

Specification for jolting apparatus for testing cement

Quick Reference Values

Total mass of moving parts (table, mould, clamps)20.0 ± 0.5 kg

Frequency of jolts60 jolts in 60 seconds

Height of drop15.0 ± 0.3 mm

Internal dimensions of cube mould70.6 mm

Motor speed for drive mechanismApproximately 1440 rev/min

Hardness of contact faces on cam and plungerNot less than 55 HRC

Practical Notes

Ensure the apparatus is installed on a rigid, level concrete foundation to prevent rocking, which can significantly affect compaction and lead to inaccurate strength results.

Regularly verify the drop height (15mm) and frequency (60/min) as wear of the cam and plunger can alter these critical parameters over time.

The total mass of moving parts (20kg) is crucial for standard compaction energy. Do not use non-standard or modified moulds or clamps.