EN 12390-14:2018
(Main)Testing hardened concrete - Part 14: Semi-adiabatic method for the determination of heat released by concrete during its hardening process
Testing hardened concrete - Part 14: Semi-adiabatic method for the determination of heat released by concrete during its hardening process
This document specifies the procedure for the determination of heat released by concrete during its hardening process in semi-adiabatic conditions in a laboratory. Annex B specifies the procedure when the test is performed on site. The test is suitable for specimens having a declared value of D of the coarsest fraction of aggregates actually used in the concrete (Dmax) not greater than 32 mm.
Prüfung von Festbeton - Teil 14: Teiladiabatisches Verfahren zur Bestimmung der Wärme, die während des Erhärtungsprozesses von Beton freigesetzt wird
Dieses Dokument legt das Verfahren zur Bestimmung der von Beton während des Erhärtungsprozesses unter teiladiabatischen Bedingungen in einem Labor freigesetzten Wärme fest. In Anhang B ist das Verfahren für den Fall der Prüfung vor Ort festgelegt. Die Prüfung eignet sich für Probekörper, für die der angegebene Wert D für das Größtkorn der im Beton verwendeten Gesteinskörnung (Dmax) höchstens 32 mm beträgt.
Essais pour béton durci - Partie 14 : Méthode semi-adiabatique de détermination de la chaleur dégagée par le béton en cours de durcissement
Le présent document spécifie le mode opératoire de détermination de la chaleur dégagée par le béton au cours de son processus de durcissement en condition semi-adiabatique en laboratoire. L’Annexe B spécifie le mode opératoire lorsque l’essai est réalisé sur site. L’essai est adapté aux éprouvettes ayant une valeur déclarée D de la partie la plus grosse des granulats réellement utilisés dans le béton (Dmax) ne dépassant pas 32 mm.
Preskušanje strjenega betona - 14. del: Semiadiabatska metoda za ugotavljanje toplote, ki se sprosti med procesom strjevanja betona
Ta evropski standard določa postopek za ugotavljanje toplote, ki se sprosti med procesom strjevanja betona v semiadiabatskem pogoju v laboratoriju. Dodatek B določa postopek, ki se uporablja, kadar je preskus izveden na mestu uporabe.
General Information
Overview
EN 12390-14:2018 (CEN) defines a laboratory semi-adiabatic test method for measuring the heat released by concrete during hardening. The procedure quantifies heat evolution (J/kg) over time for a fresh concrete specimen placed in a semi‑adiabatic calorimeter. Annex B gives an informative procedure for on‑site testing. The method is suitable for concretes with maximum aggregate size (Dmax) up to 32 mm and for all EN 206 cements except quick‑setting types.
Key topics and technical requirements
- Test principle: Heat released equals the heat accumulated in the specimen and calorimeter plus cumulative heat loss to the environment; two matched semi‑adiabatic calorimeters (test + control) are used.
- Apparatus essentials: semi‑adiabatic calorimeter with insulated calorimetric cell, probe tube filled with diathermal fluid for thermometer contact, and mould (≥5 L). Typical mould materials and wall thicknesses are specified.
- Calibration: Calorimeters must be calibrated (Annex A) to determine heat loss coefficient and heat capacity. Calibration is required every 4 years or after modification.
- Measurement & accuracy: Thermometer accuracy ≤ 0.3 K; balance accuracy ≤ 0.1 %; digital multimeter accuracy ≤ 0.1 % for calibration circuits.
- Specimen & control: Use a thermally inert control specimen (similar heat capacity ±15 %) and ensure calorimeters’ heat loss coefficients and heat capacities are within ±15 % of each other.
- Environmental conditions: Conditioned room at (20 ± 2) °C; materials and calorimeters preconditioned at test temperature for ≥24 h.
- Procedure notes: Record initial time t0 (when water contacts cement), initial temperatures (concrete, control, ambient), and monitor temperatures at regular intervals to compute semi‑adiabatic heat release q(t).
- Limits: Suitable for specimens where Dmax ≤ 32 mm; not intended for quick‑setting cements.
Applications and users
Practical uses include:
- Mix design and thermal performance assessment of concrete (mass concrete, large elements)
- Assessing risk of thermal cracking and early-age temperature development
- Quality control in precast, ready‑mix and mass concrete production
- Research on cementitious binder hydration and admixture effects
Typical users:
- Concrete testing laboratories and university research groups
- Ready‑mix producers and precast manufacturers
- Structural and materials engineers, consultants involved in thermal design of concrete works
Related standards
- EN 12390 series (Testing hardened concrete) - Parts 1–17 (e.g., Part 1, Part 2)
- EN 12350-1 (Sampling fresh concrete)
- EN 12390-2 (Making and curing specimens for strength tests)
- EN 206 (Concrete - Specification, performance, production and conformity)
Keywords: EN 12390-14:2018, semi‑adiabatic, heat release, concrete hardening, semi‑adiabatic calorimeter, testing hardened concrete, concrete heat of hydration.
Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Preskušanje strjenega betona - 14. del: Semiadiabatska metoda za ugotavljanje toplote, ki se sprosti med procesom strjevanja betonaPrüfung von Festbeton -Teil 14: Teiladiabatisches Verfahren zur Bestimmung der Wärme, die während des Erhärtungsprozesses von Beton freigesetzt wirdEssai pour béton durci - Partie 14: Méthode semi-adiabatique de détermination de la chaleur dégagée par le béton au cours son processus de durcissementTesting hardened concrete - Part 14: Semi-adiabatic method for the determination of heat released by concrete during its hardening process91.100.30Beton in betonski izdelkiConcrete and concrete productsICS:Ta slovenski standard je istoveten z:EN 12390-14:2018SIST EN 12390-14:2018en,fr,de01-oktober-2018SIST EN 12390-14:2018SLOVENSKI
STANDARD
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 12390-14
August
t r s z ICS
{ sä s r rä u r English Version
Testing hardened concrete æ Part
s vã Semiæadiabatic method for the determination of heat released by concrete during its hardening process Essais pour béton durci æ Partie
s v ã Méthode semiæadiabatique de détermination de la chaleur dégagée par le béton en cours de durcissement
Prüfung von Festbeton æ Teil
s vã Teiladiabatisches Verfahren zur Bestimmung der Wärmeá die während des Erhärtungsprozesses von Beton freigesetzt wird This European Standard was approved by CEN on
{ April
t r s zä
egulations which stipulate the conditions for giving this European Standard the status of a national standard without any alterationä Upætoædate lists and bibliographical references concerning such national standards may be obtained on application to the CENæCENELEC Management Centre or to any CEN memberä
translation under the responsibility of a CEN member into its own language and notified to the CENæCENELEC Management Centre has the same status as the official versionsä
CEN members are the national standards bodies of Austriaá Belgiumá Bulgariaá Croatiaá Cyprusá Czech Republicá Denmarká Estoniaá Finlandá Former Yugoslav Republic of Macedoniaá Franceá Germanyá Greeceá Hungaryá Icelandá Irelandá Italyá Latviaá Lithuaniaá Luxembourgá Maltaá Netherlandsá Norwayá Polandá Portugalá Romaniaá Serbiaá Slovakiaá Sloveniaá Spainá Swedená Switzerlandá Turkey and United Kingdomä
EUROPEAN COMMITTEE FOR STANDARDIZATION COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre:
Rue de la Science 23,
B-1040 Brussels
t r s z CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Membersä Refä Noä EN
s t u { ræ s vã t r s z ESIST EN 12390-14:2018
Calibration of semi-adiabatic calorimeter . 12 A.1 Calibration of the semi-adiabatic calorimeter . 12 A.1.1 General . 12 A.1.2 Determination of the total heat loss coefficient . 12 A.1.3 Determination of heat capacity . 13 A.2 Alternative method for the calibration of semi-adiabatic calorimeter . 14 A.2.1 Calibration procedure . 14 A.2.2 Determination of heat capacity and heat loss coefficient. 14 Annex B (informative)
Experimentation on site . 16 Annex C (informative)
Specific heat of concrete components . 17 Bibliography . 18
http://www.electropedia.org/
http://www.iso.org/obp 3.1.1 semi-adiabatic calorimeter equipment containing a calorimetric cell where the maximum heat losses are limited 3.1.2 calorimeter coefficient of heat loss () proportionality factor between heat losses and the difference of temperature between inside and outside of the calorimeter; the coefficient of heat loss is a linear function of this difference of temperature 3.1.3 semi-adiabatic heat release (q) heat released by unit mass of concrete during its hydration in semi-adiabatic conditions as a function of time 3.1.4 calorimeter cell element containing the test sample in its mould or control specimen and having an external insulated enclosure with a sealable removable cover SIST EN 12390-14:2018
two measures of temperature cc
specific heat of cement cad
specific heat of additions cag
specific heat of dry aggregate cw
average specific heat of water in hardening concrete mcon kg mass of concrete sample mc=kg nominal mass of cement in the mix design per cubic metre mad kg nominal mass of additions in
the mix design per cubic metre mag kg nominal mass of dry aggregate in
the mix design per cubic metre mw=kg nominal mass of total water in
the mix design per cubic metre mmould kg sum of the masses of empty mould, probe tube and mould cover u, du - mathematical integration variable Q(tn) J calculated heat loss between measurements numbers n-1 and n R2 — regression coefficient CT J/K total heat capacity of the system equipment containing calibration sample, a reference sample or the calibration medium a, b — calibration coefficients SIST EN 12390-14:2018
¶ 2·10 «4; and stability as a function of the
¶ 10 «4. One calibration cylinder (see A.1.1), containing an aluminium specimen with an identical shape to the test specimen and an electrical resistance of 2 500 ohms minimum with a resistivity having a low temperature coefficient of resistance e.g. constantan or manganin wire. The resistance connection wires are designed with a maximum cross-section of 0,05 mm2 to avoid heat leaks. Another calorimeter used as a reference calorimeter, equipped with an inert specimen of an identical design to the calibration cylinder, yet without an electrical resistance. 5.4 Semi-adiabatic calorimeter To perform the test, two calorimeters having heat loss coefficients () at 20 °C and heat capacities (Ccal) to within 15 % of each other are required [3]. One contains the control specimen, the other the test specimen. Each calorimeter typically consists of a calorimetric cell with a removable insulated cover and an external enclosure made with a high heat conductivity material, e.g. steel or other suitable material. The calorimeter cell is surrounded by an external insulating layer encased in a rigid caisson. SIST EN 12390-14:2018
K.
Key Equipment items: 1 Probe tube for thermometer in diatherma
...
Frequently Asked Questions
EN 12390-14:2018 is a standard published by the European Committee for Standardization (CEN). Its full title is "Testing hardened concrete - Part 14: Semi-adiabatic method for the determination of heat released by concrete during its hardening process". This standard covers: This document specifies the procedure for the determination of heat released by concrete during its hardening process in semi-adiabatic conditions in a laboratory. Annex B specifies the procedure when the test is performed on site. The test is suitable for specimens having a declared value of D of the coarsest fraction of aggregates actually used in the concrete (Dmax) not greater than 32 mm.
This document specifies the procedure for the determination of heat released by concrete during its hardening process in semi-adiabatic conditions in a laboratory. Annex B specifies the procedure when the test is performed on site. The test is suitable for specimens having a declared value of D of the coarsest fraction of aggregates actually used in the concrete (Dmax) not greater than 32 mm.
EN 12390-14:2018 is classified under the following ICS (International Classification for Standards) categories: 91.100.30 - Concrete and concrete products. The ICS classification helps identify the subject area and facilitates finding related standards.
You can purchase EN 12390-14:2018 directly from iTeh Standards. The document is available in PDF format and is delivered instantly after payment. Add the standard to your cart and complete the secure checkout process. iTeh Standards is an authorized distributor of CEN standards.
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.
Loading comments...