1、BSI Standards PublicationBS EN ISO 12571:2013Hygrothermal performanceof building materials andproducts Determination ofhygroscopic sorption properties(ISO 12571:2013)BS EN ISO 12571:2013 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of EN ISO12571:2013. It supersede
2、s BS EN ISO 12571:2000 which is withdrawn.The UK participation in its preparation was entrusted to TechnicalCommittee B/540, Energy performance of materials components andbuildings.A list of organizations represented on this committee can beobtained on request to its secretary.This publication does
3、not purport to include all the necessaryprovisions of a contract. Users are responsible for its correctapplication. The British Standards Institution 2013. Published by BSI StandardsLimited 2013ISBN 978 0 580 78146 9ICS 91.100.01Compliance with a British Standard cannot confer immunity fromlegal obl
4、igations.This British Standard was published under the authority of theStandards Policy and Strategy Committee on 31 August 2013.Amendments issued since publicationDate Text affectedEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 12571 August 2013 ICS 91.100.01 Supersedes EN ISO 12571:2000E
5、nglish Version Hygrothermal performance of building materials and products - Determination of hygroscopic sorption properties (ISO 12571:2013) Performance hygrothermique des matriaux et produits pour le btiment - Dtermination des proprits de sorption hygroscopique (ISO 12571:2013) Wrme- und feuchtet
6、echnisches Verhalten von Baustoffen und Bauprodukten - Bestimmung der hygroskopischen Sorptionseigenschaften (ISO 12571:2013) This European Standard was approved by CEN on 26 July 2013. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for givin
7、g 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 European Standard exists in three offic
8、ial 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 the national standards bodies of
9、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, Romania, Slovakia, Slovenia, Spain, S
10、weden, Switzerland, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2013 CEN All rights of exploitation in any form and by any means reserved worldwide for
11、 CEN national Members. Ref. No. EN ISO 12571:2013: EBS EN ISO 12571:2013EN ISO 12571:2013 (E) 3 Foreword This document (EN ISO 12571:2013) has been prepared by Technical Committee ISO/TC 163 “Thermal performance and energy use in the built environment“ in collaboration with Technical Committee CEN/T
12、C 89 “Thermal performance of buildings and building components” the secretariat of which is held by SIS. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by February 2014, and conflicting national sta
13、ndards shall be withdrawn at the latest by February 2014. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN and/or CENELEC shall not be held responsible for identifying any or all such patent rights. This document supersedes EN
14、ISO 12571:2000. According to the CEN-CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedo
15、nia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. Endorsement notice The text of ISO 12571:2013 has been approved by CEN
16、as EN ISO 12571:2013 without any modification. BS EN ISO 12571:2013ISO 12571:2013(E) ISO 2013 All rights reserved iiiContents PageForeword iv1 Scope . 12 Normative references 13 Terms and definitions, symbols and units . 13.1 Terms and definitions . 13.2 Symbols and units 24 Principle 24.1 Sorption
17、curve . 24.2 Desorption curve . 25 Apparatus . 35.1 Desiccator method . 35.2 Climatic chamber method . 36 Test specimens 36.1 Specification of the test specimens . 36.2 Number of test specimens . 37 Procedure. 37.1 Test conditions 37.2 Desiccator method . 47.3 Climatic chamber method . 58 Calculatio
18、n and expression of results . 68.1 Hygroscopic sorption 68.2 Equilibrium moisture content curves . 69 Accuracy of measurement 79.1 Error in moisture content 79.2 Control of environmental conditions . 710 Test report . 8Annex A (informative) Air relative humidities above saturated solutions in equili
19、brium 9Annex B (informative) Preparation of saturated solutions .12Annex C (informative) Example of the procedure for determining a point on a sorption curve 15Annex D (informative) Method using a glass jar 16Bibliography .18BS EN ISO 12571:2013ISO 12571:2013(E)ForewordISO (the International Organiz
20、ation for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established
21、 has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.In
22、ternational Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Public
23、ation as an International Standard requires approval by at least 75 % of the member bodies casting a vote.Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rig
24、hts.ISO 12571 was prepared by the European Committee for Standardization (CEN) in collaboration with Technical Committee ISO/TC 163, Thermal performance and energy use in the built environment, Subcommittee SC 1, Test and measurement methods in accordance with the Agreement on technical cooperation
25、between ISO and CEN (Vienna Agreement).This second edition cancels and replaces the first edition (ISO 12571:2000), which has been technically revised.Annexes A to D of this International Standard are for information only.iv ISO 2013 All rights reservedBS EN ISO 12571:2013INTERNATIONAL STANDARD ISO
26、12571:2013(E)Hygrothermal performance of building materials and products Determination of hygroscopic sorption properties1 ScopeThis International Standard specifies two alternative methods for determining hygroscopic sorption properties of porous building materials and products:a) using desiccators
27、 and weighing cups (desiccator method);b) using a climatic chamber (climatic chamber method).The desiccator method is the reference method.This International Standard does not specify the method for sampling.The methods specified in this International Standard can be used to determine the moisture c
28、ontent of a sample in equilibrium with air at a specific temperature and humidity.2 Normative referencesThe following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the r
29、eferenced document (including any amendments) applies.ISO 9346, Hygrothermal performance of buildings and building materials Physical quantities for mass transfer VocabularyISO 12570, Hygrothermal performance of building materials and products Determination of moisture content by drying at elevated
30、temperature3 Terms and definitions, symbols and units3.1 Terms and definitionsFor the purposes of this document, the terms and definitions given in ISO 9346 and the following apply.3.1.1equilibrium moisture contentmoisture content of a porous material in equilibrium with the environment and the rela
31、tive humidity of the ambient air, at a specified temperature3.1.2moisture content mass by massmass of evaporable water divided by mass of dry material3.1.3moisture content volume by volumevolume of evaporable water divided by volume of dry material ISO 2013 All rights reserved 1BS EN ISO 12571:2013I
32、SO 12571:2013(E)3.1.4moisture content mass by volumemass of evaporable water divided by volume of dry materialNote 1 to entry: The mass of water is determined by weighing the specimen before and after drying at the appropriate drying temperature until constant mass is reached.3.1.5sorption curvecurv
33、e established at a series of increasing equilibrium relative humidities at a given temperature3.1.6desorption curvecurve established at a series of decreasing equilibrium relative humidities at a given temperature3.2 Symbols and unitsSymbol Quantity Unitm mass of test specimen kgm0mass of dried test
34、 specimen kgu moisture content mass by mass kg/kg moisture content volume by volume m3/m3w moisture content mass by volume kg/m34 Principle4.1 Sorption curveThe specimen is dried to constant mass. While maintaining a constant temperature, the specimen is placed consecutively in a series of test envi
35、ronments, with relative humidity increasing in stages. The moisture content is determined when equilibrium with each environment is reached. Equilibrium with the environment is established by weighing the specimen until constant mass is reached. A minimum of four test atmospheres shall be selected i
36、n the humidity range under consideration.After establishing the moisture content at each relative humidity the sorption curve can be drawn.4.2 Desorption curveThe starting point for desorption is a relative humidity of at least 95 %. This might be the last point of the sorption curve or might be rea
37、ched by sorption from a dried test specimen. While maintaining a constant temperature, the specimen is placed consecutively in a series of test environments, with relative humidity decreasing in stages. The moisture content is determined when equilibrium with each environment is reached. Equilibrium
38、 with the environment is established by weighing the specimen until constant mass is reached. A minimum of four test atmospheres shall be selected in the humidity range under consideration. Finally, the specimen is dried to constant mass.After establishing the moisture content at each relative humid
39、ity the desorption curve can be drawn.NOTE A defined starting point for desorption has been chosen for better reproducibility.2 ISO 2013 All rights reservedBS EN ISO 12571:2013ISO 12571:2013(E)5 Apparatus5.1 Desiccator methodThe test apparatus shall include:a) weighing cups which do not absorb water
40、 and with tight-fitting lids;b) balance, capable of weighing to an accuracy of 0,01 % of the mass of the test specimen;NOTE If larger weighing cups are used, the weighing accuracy can be determined with respect to the total mass and the required accuracy of the test results.c) drying oven, in accord
41、ance with ISO 12570;d) desiccator, capable of maintaining the relative humidity within 2 % relative humidity;e) constant-temperature chamber, capable of maintaining the specified test temperature to an accuracy of 0,5 K.5.2 Climatic chamber methodThe test apparatus shall include:a) weighing cups whi
42、ch do not absorb water;b) balance, capable of weighing to an accuracy of 0,01 % of the mass of the test specimen;NOTE If larger weighing cups are used, the weighing accuracy can be determined with respect to the total mass and the required accuracy of the test results.c) drying oven, in accordance w
43、ith ISO 12570;d) climatic chamber, capable of maintaining the relative humidity within 5 % relative humidity and the temperature within 2 K over the whole test area.6 Test specimens6.1 Specification of the test specimensA test specimen shall be representative of the product and have a mass of at lea
44、st 10 g. Specimens of materials with a dry density less than 300 kg/m3shall have an area of at least 100 mm 100 mm. If it can be demonstrated from other references that the result will not be affected, a test specimen can be cut or crushed into smaller pieces to reduce the time to reach equilibrium
45、with the environment.6.2 Number of test specimensA minimum of three specimens shall be tested. The procedure in Clause 7 shall be applied to each specimen.7 Procedure7.1 Test conditionsReference sorption curves shall be established at a temperature of (23 0,5) C or (27 0,5) C in tropical countries.
46、If agreed between the parties, sorption curves can be established at other temperatures for specific applications. ISO 2013 All rights reserved 3BS EN ISO 12571:2013ISO 12571:2013(E)7.2 Desiccator method7.2.1 GeneralMake up the appropriate saturated aqueous solution to achieve the necessary relative
47、 humidity in the desiccator.Standard air relative humidities to be selected for measuring sorption curves are shown in Table 1. Choose 5 or more conditions that include No.2, No.4 and No.6 in Table 1.NOTE Annex A gives the air relative humidities of various saturated solutions in equilibrium, and An
48、nex B describes the preparation of various solutions.Place the desiccator in the constant-temperature chamber (see Figure 1). The depth of saturated aqueous solution shall be 30 mm50 mm.Table 1 Standard air relative humidities above saturated solutions in equlibrium No. SubstanceRelative humidity(%)
49、a1 KOH 9 82 MgCl26H2O 33 333 Mg(NO3)26H2O 53 524 NaCl 75 755 KCl 85 846 KNO393 93a Relative humidities in left column correspond to air temperature 23 C. Relative humidities in right column correspond to air temperature 27 C.7.2.2 Sorption curveWeigh the weighing cup and lid when empty and dry. Put the test specimen into the weighing cup without the lid and dry it until constant mass in the drying oven at the temperature specified in ISO 12570.Constant mass is reached if the change of mass between three consecutive weighin
