EN 196-11:2018

• Abstract:

  This document specifies the apparatus and procedure for determining the heat of hydration of cements and other hydraulic binders at different test ages by isothermal conduction calorimetry.; This test procedure is intended for measuring the heat of hydration of cement up to 7 days in order to obtain correspondence between Isothermal Conduction Calorimetry (ICC) and EN 196 8 and EN 196 9. Nevertheless this test duration may be critical for some apparatus, even if they can work properly at shorter test ages.; Contrary to EN 196 8 this method gives the heat of hydration continuously over the time. Additionally, the heat flow versus time is given.

• Status: Published
• Publication Date: 18-Dec-2018
• Withdrawal Date: 29-Sep-2020
• ICS: 91.100.10 - Cement. Gypsum. Lime. Mortar
• Technical Committee: CEN/TC 51 - Cement and building limes
• Drafting Committee: CEN/TC 51/WG 15 - Revision of methods of testing cement
• Current Stage: 9093 - Decision to confirm - Review Enquiry
• Start Date: 04-Jun-2024
• Completion Date: 02-Sep-2026
• Directive: Harmonized Standard305/2011 - Regulation (eu) No 305/2011 of the European Parliament and of the Council of 9 march 2011 laying down harmonised conditions for the marketing of construction products and repealing council directive 89/106/eec
• Mandate: M/114 - Mandate to CEN/CENELEC concerning the execution of standardization work for harmonized standards on cements, buliding limes, and other hydr. binders
• Ref Project: SIST EN 196-11:2019 - Methods of testing cement - Part 11: Heat of hydration - Isothermal Conduction Calorimetry method

EN 196-11:2018 - Overview

EN 196-11:2018 (CEN) defines the apparatus and procedure for determining the heat of hydration of cement and other hydraulic binders by Isothermal Conduction Calorimetry (ICC). The method provides a continuous record of heat release (heat flow versus time) and total heat of hydration up to 7 days, enabling correspondence with the solution and semi-adiabatic methods in EN 196-8 and EN 196-9. The standard is intended for laboratories performing cement testing, research, quality control and product development.

Key topics and technical requirements

• Principle: ICC measures heat flow from a sample held in thermal contact with a constant-temperature heat sink; at least one sample cell and one reference cell are used.
• Thermostat: working temperature (20 ± 0.2) °C; temperature instability ≤ 0.2 °C.
• Continuous outputs: heat flow vs time and time-integrated heat (J/g) for the sample.
• Calorimeter parameters required:
  • Detection limit (DL): < 2.8 W/g
  • Baseline noise (BN): < 10.5 W/g
  • Baseline drift (BD): < 5.5 W/g per week
• Calibration: two recommended procedures - steady-state calibration and pulse calibration - using electrical heaters to establish the calibration coefficient (W/V) and the instrument time constant (s).
• Cells and balancing: sample and reference cells (ampoules and holders) should match in heat capacity; an inert reference reduces baseline noise and drift.
• Methods for mixing/sample introduction: Method A (external mixing) and Method B (internal mixing) are specified for practical testing.
• Key measured/defined terms: baseline output, baseline drift, baseline noise, time constant, detection limit, and calibration coefficient.

Practical applications and users

• Quality control in cement manufacturing - monitor early-age heat release to verify batch-to-batch consistency.
• Product development and R&D - compare formulations, admixtures, SCMs (supplementary cementitious materials) and their impact on hydration kinetics.
• Research and academic labs - study hydration mechanisms, kinetics and thermal behavior of binders.
• Forensic and performance assessment - assess risk of thermal cracking in mass concrete by quantifying heat evolution profiles.
• Users: cement testing laboratories, standards bodies, university researchers, concrete technologists and construction material certification labs.

Related standards

• EN 196 series (testing cement): notably EN 196-8 (solution method) and EN 196-9 (semi-adiabatic method) for cross-method correspondence.
• Use EN 196-11 together with other EN 196 parts for comprehensive cement characterization.

Keywords: EN 196-11, isothermal conduction calorimetry, ICC, heat of hydration, calorimeter calibration, heat flow profile, cement testing, baseline drift.