What is the primary purpose of this standard?

To specify the design and components of the calorimeter apparatus used to measure the heat of hydration of hydraulic cement.

What is the required precision of the thermometer?

The thermometer must be a differential or Beckman type, capable of being read to 0.01 °C (Clause 3.2).

Which test method uses the apparatus specified in IS 11262?

The method for determination of heat of hydration of hydraulic cement, described in IS 4031 (Part 8).

What is the specified speed for the calorimeter's stirrer?

The stirrer must operate at a constant speed of 600 ± 50 revolutions per minute (Clause 3.3).

IS 11262

: 1985

Specification for calorimeter for the determination of heat of hydration of hydraulic cement

CurrentSpecializedSpecificationMaterials Science · Cement, Concrete, Aggregates and RCC

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This Indian Standard specifies the requirements for the construction, assembly, and calibration of a calorimeter apparatus. This apparatus is used for determining the heat of hydration of hydraulic cements by the method of solution, as detailed in IS 4031 (Part 8).

Specification for calorimeter for the determination of heat of hydration of hydraulic cement

Quick Reference Values

Stirrer Speed600 ± 50 rpm

Thermometer Readability0.01 °C

Dewar Flask CapacityApprox. 1 litre (wide-mouth type)

Stirrer Propeller MaterialPlastic

Test Temperature (Water Bath)27 ± 0.2 °C

Key Formulas

C = [W * (θ₁ - θf) + h] / (θf - θ₂) — Determination of Calorimeter Constant (Water Equivalent)

Q = [C * (θf - θi) - h₁] / Wc — Calculation of Heat of Hydration

Practical Notes

This standard only specifies the apparatus; the complete test procedure is detailed in IS 4031 (Part 8).

The accuracy of the test results is highly dependent on the correct determination of the calorimeter constant (water equivalent).

Ensuring the integrity of the Dewar flask's vacuum is critical to prevent heat loss and obtain accurate readings.