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IS 11262:1985 is the Indian Standard (BIS) for calorimeter for the determination of heat of hydration of hydraulic cement. 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
Overview
Status
Current
Usage level
Specialized
Domain
Materials Science — Cement, Concrete, Aggregates and RCC
Standard Test Method for Heat of Hydration of Hydraulic Cement
Defines the test method and apparatus (calorimeter) for the heat of solution method.
EN 196-8:2010CEN (European Committee for Standardization), Europe
HighCurrent
Methods of testing cement - Part 8: Heat of hydration - Solution method
Specifies the heat of solution method, including detailed requirements for the calorimeter.
BS EN 196-8:2010BSI (British Standards Institution), UK
HighCurrent
Methods of testing cement. Heat of hydration. Solution method
UK implementation of EN 196-8, specifying the apparatus and procedure for the solution method.
Key Differences
≠The method of introducing the cement sample differs. EN 196-8 specifies breaking a sealed glass ampoule containing the sample inside the acid, whereas IS 11262 describes dropping it from a glass tube and ASTM C186 uses a funnel.
≠Stirrer speed requirements are not harmonized. IS 11262 specifies 600 ± 50 rpm, ASTM C186 requires a tighter tolerance of 600 ± 25 rpm, while EN 196-8 specifies a slower speed of 400 ± 20 rpm.
≠While IS 11262 references a Beckmann thermometer (typical for its era), ASTM C186 explicitly permits and provides specifications for modern digital thermometers or thermistors with higher resolution (0.001°C).
≠IS 11262 is a dedicated specification for the calorimeter itself, while the test procedure is in IS 4031 (Part 8). International standards like ASTM C186 and EN 196-8 integrate the apparatus specification and the test method into a single document.
Key Similarities
≈All standards are based on the same fundamental principle: the 'heat of solution' method, which determines heat of hydration by measuring the difference in heat of solution between unhydrated and hydrated cement.
≈The core apparatus in all standards consists of a well-insulated Dewar flask (calorimeter), a mechanical stirrer, a precise thermometer, and a lid/stopper assembly to create a closed system.
≈All standards specify the use of a highly corrosive acid mixture (typically Nitric Acid and Hydrofluoric Acid) to dissolve the cement samples, dictating the need for corrosion-resistant materials for the stirrer and sample holder.
≈All require determination of the calorimeter's heat capacity (calorimeter constant) through either electrical calibration (passing a known current for a known time) or chemical calibration (e.g., using zinc oxide).
Parameter Comparison
Parameter
IS Value
International
Source
Stirrer Speed
600 ± 50 rpm
400 ± 20 rpm
EN 196-8:2010
Stirrer Speed
600 ± 50 rpm
600 ± 25 rpm
ASTM C186-22
Thermometer Readability/Resolution
0.01 °C
At least 0.01 °C
EN 196-8:2010
Thermometer Resolution (Digital)
Not specified (standard predates common use)
0.001 °C
ASTM C186-22
Calorimeter (Dewar) Capacity
1 litre
Approx. 1-qt (950 mL)
ASTM C186-22
Sample Introduction Method
Glass sample tube
Sealed glass ampoule, broken in-situ
EN 196-8:2010
Stirrer Material
Glass or suitable plastic
Plastics material e.g. PTFE, or glass
EN 196-8:2010
⚠ Verify details from original standards before use