EN 12390-14-2018 Testing hardened concrete - Part 14 Semi-adiabatic method for the determination of heat released by concrete during its hardening process.pdf

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1、BSI Standards PublicationWB11885_BSI_StandardCovs_2013_AW.indd 1 15/05/2013 15:06Testing hardened concretePart 14: Semi-adiabatic method for the determination of heat released by concrete during its hardening processBS EN 12390-14:2018EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 12390-14 Aug

2、ust 2018 ICS 91.100.30 English Version Testing hardened concrete - Part 14: Semi-adiabatic method for the determination of heat released by concrete during its hardening process Essais pour bton durci - Partie 14 : Mthode semi-adiabatique de dtermination de la chaleur dgage par le bton en cours de d

3、urcissement Prfung von Festbeton - Teil 14: Teiladiabatisches Verfahren zur Bestimmung der Wrme, die whrend des Erhrtungsprozesses von Beton freigesetzt wird This European Standard was approved by CEN on 9 April 2018. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which st

4、ipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN member. This Europea

5、n Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions. CEN members are t

6、he national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Roman

7、ia, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels 2018 CEN All rights of exploitation in any

8、form and by any means reserved worldwide for CEN national Members. Ref. No. EN 12390-14:2018 ENational forewordThis British Standard is the UK implementation of EN 1239014:2018.The UK participation in its preparation was entrusted to Technical Committee B/517/1, Concrete production and testing.A lis

9、t of organizations represented on this committee can be obtained on request to its secretary.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. The British Standards Institution 2018 Published by BSI Standards L

10、imited 2018ISBN 978 0 580 92694 5ICS 91.100.30Compliance with a British Standard cannot confer immunity from legal obligations. This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 August 2018.Amendments/corrigenda issued since publicationDate

11、Text affectedBRITISH STANDARDBS EN 1239014:2018EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 12390-14 August 2018 ICS 91.100.30 English Version Testing hardened concrete - Part 14: Semi-adiabatic method for the determination of heat released by concrete during its hardening process Essais pou

12、r bton durci - Partie 14 : Mthode semi-adiabatique de dtermination de la chaleur dgage par le bton en cours de durcissement Prfung von Festbeton - Teil 14: Teiladiabatisches Verfahren zur Bestimmung der Wrme, die whrend des Erhrtungsprozesses von Beton freigesetzt wird This European Standard was app

13、roved by CEN on 9 April 2018. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national

14、standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language a

15、nd notified to the CEN-CENELEC Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hung

16、ary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG

17、CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels 2018 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 12390-14:2018 EBS EN 1239014:2018EN 12390-14:2018 (E) 2 Contents Page European foreword . 3 1 Scope 5 2 Norma

18、tive references 5 3 Terms, definitions, symbols, units and scripts . 5 3.1 Terms and definitions . 5 3.2 Symbols, units and scripts . 6 4 Principle . 7 5 Apparatus . 7 5.1 Thermometers . 7 5.2 Balance 7 5.3 Temperature monitoring and control system 7 5.4 Semi-adiabatic calorimeter . 7 5.5 Control sp

19、ecimen 9 6 Procedure. 9 7 Expression of results - Semi-adiabatic heat release 10 8 Report . 11 9 Precision 11 Annex A (normative) 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 coefficien

20、t 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

21、heat of concrete components 17 Bibliography . 18 BS EN 1239014:2018EN 12390-14:2018 (E) 3 European foreword This document (EN 12390-14:2018) has been prepared by Technical Committee CEN/TC 104 “Concrete and related products”, the secretariat of which is held by DIN. This European Standard shall be g

22、iven the status of a national standard, either by publication of an identical text or by endorsement, at the latest by February 2019, and conflicting national standards shall be withdrawn at the latest by February 2019. Attention is drawn to the possibility that some of the elements of this document

23、 may be the subject of patent rights. CEN shall not be held responsible for identifying any or all such patent rights. This standard is one of a series on testing concrete. EN 12390, Testing hardened concrete, consists of the following parts: Part 1: Shape, dimensions and other requirements of speci

24、mens and moulds Part 2: Making and curing specimens for strength tests Part 3: Compressive strength of test specimens Part 4: Compressive strength - Specification for testing machines Part 5: Flexural strength of test specimens Part 6: Tensile splitting strength of test specimens Part 7: Density of

25、hardened concrete Part 8: Depth of penetration of water under pressure Part 10: Determination of the carbonation resistance of concrete at atmospheric levels of carbon dioxide Part 11: Testing hardened concrete. Determination of the chloride resistance of concrete, unidirectional diffusion Part 13:

26、Determination of secant modulus of elasticity Part 14: Semi-adiabatic method for the determination of heat released by concrete during its hardening process Part 15: Adiabatic method for the determination of heat released by concrete during its hardening process Part 16: Determination of shrinkage o

27、f concrete (in preparation) Part 17: Determination of creep of concrete in compression (in preparation) According to the CEN-CENELEC Internal Regulations, the national standards organisations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croati

28、a, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, BS EN 1239014:2018EN 12390-14:2018 (E) 4 France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slo

29、venia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. BS EN 1239014:2018EN 12390-14:2018 (E) 5 1 Scope 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

30、 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. 2 Normative references The following documents are referred to in the text in such a way

31、that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 12350-1, Testing fresh concrete - Part 1: Sampling EN 12390-

32、2, Testing hardened concrete - Part 2: Making and curing specimens for strength tests 3 Terms, definitions, symbols, units and scripts 3.1 Terms and definitions For the purposes of this document, the following terms and definitions apply. ISO and IEC maintain terminological databases for use in stan

33、dardization at the following addresses: IEC Electropedia: available at http:/www.electropedia.org/ ISO Online browsing platform: available at 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 co

34、efficient 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 o

35、f 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 BS EN 1239014:2018EN 12390-14:2018 (E) 6 3.2 Symbol

36、s, units and scripts For the purposes of this document, the symbols and units in Table 1 apply. Table 1 Symbols, units and explanation Symbol Units Explanation Ccal J/K heat capacity of the calorimeter Ccon J/K total heat capacity of the concrete specimen alone Cmould J/K total heat capacity of the

37、mould with probe tube and mould cover Ctot J/K total heat capacity J/(hK) coefficient of heat loss of calorimeter (t) K difference in temperature between the concrete specimen and the control specimen at time t q(t) J/kg heat release by unit mass of concrete at time t Text,0 C initial ambient temper

38、ature in the conditioned testing room Text(t) C ambient temperature in the conditioned testing room at time t Tcon,0 C initial temperature of fresh concrete Tcon(t) C temperature of the concrete specimen at time t Tcal(t) C temperature of the calorimeter cell at time t Tctl(t) C temperature of the c

39、ontrol specimen at time t t h time elapsed since start of test t0 t0 initial time of test (first contact of water with cement) t min time interval between two measures of temperature cc J/(kgK) specific heat of cement cad J/(kgK) specific heat of additions cag J/(kgK) specific heat of dry aggregate

40、cw J/(kgK) 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

41、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 o

42、f the system equipment containing calibration sample, a reference sample or the calibration medium a, b calibration coefficients BS EN 1239014:2018EN 12390-14:2018 (E) 7 4 Principle The test determines the quantity of heat released over time of a concrete specimen placed into a semi-adiabatic calori

43、meter designed for concrete. The quantity of heat produced, expressed in joules per kilogram of concrete, is determined at regular intervals from just after casting of the specimen. The test is carried out using two calorimeters which have been constructed to minimize the heat loss from the concrete

44、 sample to the surrounding environment and have similar heat loss coefficients and heat capacities. A sample of fresh concrete is placed in a mould which is then introduced into the calorimeter and the internal temperature of the hardening concrete is measured. At any given time, the heat released b

45、y hydration equals the heat accumulated into both calorimeter and specimen plus the cumulative heat that has dissipated to the outside since the initial time. The test is suitable for concrete containing all types of cement referred to in EN 206, with the exception of quick-setting cements. 5 Appara

46、tus 5.1 Thermometers To measure the temperature of the fresh concrete specimen (Tcon) and the temperature of the control specimen (Tctl) with a maximum permissible error of 0,3 K in the working range of the test of (10-100) C. 5.2 Balance To measure the mass of the concrete to a maximum permissible

47、error of 0,1 %. 5.3 Temperature monitoring and control system A digital multimeter, used to measure both the calibration cylinder resistance and test voltages having a maximum permissible error of 0,1 % in the operating range (0-200) V. Stabilized power supply, with voltage adjustable between 2 and

48、200 V minimum; stability as a function of load: V/V 2104; and stability as a function of the mains voltage V/V 104. 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 resistivit

49、y 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 mm2to 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