What penetration depth defines standard consistency?

The paste has standard consistency when the 10 mm plunger penetrates to a point 5 to 7 mm from the bottom of the Vicat mould.

What is the allowed gauging time?

The time of gauging must be between 3 and 5 minutes, counted from the moment water is added to the dry cement.

What environmental conditions are required for the test?

The test must be conducted at a temperature of 27 ± 2°C and a relative humidity of 65 ± 5%.

IS 4031 Part 3

: 1988

Methods of Physical Tests for Hydraulic Cement - Part 3: Determination of consistency of standard cement paste

CurrentFrequently UsedTesting MethodMaterials Science · Cement

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This standard details the physical testing method to determine the standard consistency of hydraulic cement paste using a Vicat apparatus. The consistency is determined by finding the water content at which a standard 10 mm plunger penetrates to a depth of 5 to 7 mm from the bottom of the mould.

Describes the procedure for determining the normal consistency of hydraulic cement paste using the Vicat apparatus.

Quick Reference Values

Target penetration for standard consistency5 to 7 mm from the bottom of the Vicat mould

Test room temperature27 ± 2 °C

Test room relative humidity65 ± 5 %

Gauging time limit3 to 5 minutes

Vicat plunger diameter10 mm

Vicat plunger length50 mm

Vicat mould depth40 ± 0.2 mm

Practical Notes

Standard consistency (often denoted as 'P') must be determined first, as it dictates the water content required for subsequent tests like initial/final setting time and soundness.

Strictly adhere to the gauging time of 3 to 5 minutes; exceeding this can initiate early hydration and alter penetration results.

Ensure the Vicat apparatus is completely free of vibrations during the test to prevent the plunger from sinking artificially deep.