1、| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | BRITISH STANDARD BS EN 1931:2000 Incorpora
2、ting Corrigendum No. 1 The European Standard EN 1931:2000 has the status of a British Standard ICS 75.140; 83.140.10; 91.100.50 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW Flexible sheets for waterproofing Bitumen, plastic and rubber sheets for roof waterproofing Determina
3、tion of water vapour transmission propertiesThis British Standard, having been prepared under the direction of the Sector Committee for Building and Civil Engineering, was published under the authority of the Standards Committee and comes into effect on 15 September 2000 BSI 17 September 2001 ISBN 0
4、 580 36356 2 BS EN 1931:2000 Amendments issued since publication Amd. No. Date Comments 13231 Corrigendum No. 1 17 September 2001 Correction to EN foreword National foreword This British Standard is the official English language version of EN 1931:2000, including corrigendum February 2001. The UK pa
5、rticipation in its preparation was entrusted by Technical Committee B/546, Flexible sheets for waterproofing, to Subcommittee B/546/1, Bituminous roofing felts, which has the responsibility to: aid enquirers to understand the text; present to the responsible European committee any enquiries on the i
6、nterpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. A list of organizations represented on this subcommittee can be obtained on request to its secretary. Cross-references The British Standa
7、rds which implement international or European publications referred to in this document may be found in the BSI Standards Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Find” facility of the BSI Standards Electronic Catalogue. A British Standard
8、 does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an
9、inside front cover, the EN title page, pages 2 to 12, an inside back cover and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued.EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 1931 July 2000 ICS 91.100.50 Incorporating corrigendum Feb
10、ruary 2001 English version Flexible sheets for waterproofing - Bitumen, plastic and rubber sheets for roof waterproofing - Determination of water vapour transmission properties Feuilles souples dtanchit - Feuilles dtanchit de toiture bitumineuses, plastiques et lastomres - Dtermination des proprits
11、de transmission de la vapeur deau Abdichtungsbahnen - Bitumen-, Kunststoff- und Elastomerbahnen fr Dachabdichtungen - Bestimmung der Wasserdampfdurchlssigkeit This European Standard was approved by CEN on 10 June 2000. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which s
12、tipulate 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 Central Secretariat or to any CEN member. This European Standar
13、d 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 Central Secretariat has the same status as the official versions. CEN members are the national standar
14、ds bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NO
15、RMUNG Central Secretariat: rue de Stassart, 36 B-1050 Brussels 2000 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 1931:2000 EPage 2 EN 1931:2000 BSI 17 September 2001 Contents Page Foreword 3 Introduction 4 1 Scope 4 2 Normative
16、references 4 3 Definitions 5 4 Principle 6 5 Apparatus 6 6 Sampling 8 7 Preparation of test specimens 8 8 Procedure 9 9 Expression of results and precision of test method 9 10 Test report 11 Bibliography 12Page 3 EN 1931:2000 BSI 17 September 2001 Foreword This European Standard has been prepared by
17、 Technical Committee CEN/TC 254, Flexible sheets for waterproofing, the Secretariat of which is held by BSI. 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 January 2001, and conflicting national
18、standards shall be withdrawn at the latest by July 2002. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Icel
19、and, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom.Page 4 EN 1931:2000 BSI 17 September 2001 Introduction This European Standard has been prepared by the Technical Committee CEN/TC 254 to determine the water vapour transmission propertie
20、s of flexible sheets for waterproofing. This standard has been prepared for applications in roofing but it may also be used in other areas where it is relevant. This standard is intended for characterization of flexible sheets for waterproofing as manufactured or supplied before use. This standard r
21、elates exclusively to products and not to waterproofing membrane systems composed of such products and installed in the works. 1 Scope This European Standard specifies a method for the determination of the water vapour transmission properties and for the calculation of the density of moisture flow r
22、ate g and of the moisture resistance factor of waterproofing sheets. It is applicable to factory made bitumen, plastic and rubber sheets for roof waterproofing. 2 Normative references This European Standard incorporates by dated or undated reference, provisions from other publications. These normati
23、ve references are cited at the appropriate places in the text and the publications are listed hereafter. For dated references, subsequent amendments to or revisions of these publications apply to this draft European Standard only when incorporated in it by amendment or revision. For undated referenc
24、es the latest edition of the publication referred to applies. prEN 13416:1998, Flexible sheets for waterproofing - Bitumen, plastic and rubber sheets for roof waterproofing - Rules for sampling EN 12591, Bitumen and bituminous binders - Specifications of paving grade bitumenPage 5 EN 1931:2000 BSI 1
25、7 September 2001 3 Definitions For the purpose of this standard, the following definitions apply. Symbol Unit 3.1 Density of moisture flow rate: The mass of water vapour transmitted through a unit area of the sheet of specified thickness in a unit time under specified conditions of temperature and h
26、umidity, quantity defined by the following relation: t A m g where A is the exposed area of the test specimen in m and t is the time interval between two corresponding weighings of the test assembly in s. g kg/(m.s) 3.2 Moisture permeance: Quantity defined by the following relation: ) ( 2 1 p p p g
27、w where p 1and p 2are ambient partial vapour pressures at the two faces of the specimen during the test. p w kg/(m.s.Pa) 3.3 Moisture permeability: Quantity defined by the following relation: d w p p where d is the thickness of the test specimen in m. p kg/(m.s.Pa) 3.4 Moisture resistance factor: Qu
28、antity defined by the following relation: p ma where ma is the moisture conductivity of air and may be calculated as given under 9.1. ma kg/(m.s.Pa) 3.5 Water vapour diffusion-equivalent air layer thickness: Quantity defined by the following relation: d s d where d is the thickness of the test speci
29、men in m. s d mPage 6 EN 1931:2000 BSI 17 September 2001 4 Principle The test specimen is sealed to the open flange of a test cup containing a desiccant. The assembly is then placed in an atmosphere with a controlled temperature and humidity. When mass take-up is linear over a period of time, the as
30、sembly is weighed periodically to determine the density of moisture flow rate through the test specimen into the desiccant. Due to the nature of the bitumen, plastic or rubber sheets concerned, the test procedure given in this standard consists of two methods: 4.1 Method A: test procedure for bitume
31、n sheets. 4.2 Method B: test procedure for plastic or rubber sheets. The technical content of the standard is, where relevant, adapted to these parts accordingly (e.g. clause 6, Preparation of test specimens). 5A p p a r a t u s 5.1 Cups (Absorption atmosphere) Use cups of pure, cold drawn aluminium
32、 of 1 mm thickness, which guarantee a free test area of 0,005 m, total weight of specimen-mounted cup and desiccant must not exceed capability of the analytical balance used (accuracy 0,1 mg), as represented in figure 1. Dimensions in millimetres Key 1 Test specimen 2 Desiccant Figure 1 - Aluminium
33、cup with absorption atmosphere 5.2 Mechanical gauge to determine the thickness d of specimen to the nearest 0,05 mm. 5.3 Analytical balance, capable of weighing the specimen-mounted cup (5.1) with an accuracy of 0,1 mg. 5.4 Constant-temperature, constant-humidity chamber capable of maintaining a rel
34、ative humidity of (75 2) % and a temperature of (23 1) C. Alternatively, use a room or chamber that can be maintained at (23 1) C together with a desiccator containing a sodium chloride solution, saturated at 23 C and containing a large excess of undissolved sodium chloride. The relative humidity at
35、 the upper test specimen surface must be kept constant during test. An air movement of 0,02 m/s to 0,3 m/s in the vaporizing atmosphere shall be produced by a propeller.Page 7 EN 1931:2000 BSI 17 September 2001Dimensions in millimetres Key 1 side view of the propeller with blades 2 saturated salt so
36、lution with remaining solid at the bottom 3 125 holes 8 per plate Figure 2 - Evaporation atmosphere (example of installation; shown without cups) 5.5 Desiccator: for the transfer of test specimens. 5.6 Desiccant: Anhydrous calcium chloride with particles size of about 5 mm in diameter, free of fines
37、 that will pass a 600 m sieve. The relative humidity in the cup atmosphere shall not exceed 1 %. During the test period the total mass increase of desiccant shall not be greater than 1,5 g per 25 cm 3 . 5.7 Sealant: Sealing compound to create a vapour tight seal between the specimen and the cup (abs
38、orption atmosphere), e.g. extruded sealant, type Butyl or Polyisobutylene or bituminous binder, paving grade bitumen 35/50 according to EN 12591.Page 8 EN 1931:2000 BSI 17 September 2001 Key 1 Inner template 2 Sealing compound 3 Test specimen 4 Cup according to picture 1 Figure 3 - One arrangement f
39、or sealing 5.8 Template or sizing form: auxiliary device for the sealing procedure. If used during sealing procedure only, d outside= (79,8 0,4) mm. If used also during test procedure, d inside= (79,8 0,4) mm. 5.9 Barometer: capable of measuring barometric pressure with an accuracy of 1 hPa. 6 Sampl
40、ing Test samples shall be taken in accordance with prEN 13416:1998. 7 Preparation of test specimens 7.1 Procedure of sampling Test specimens shall be taken evenly across the width of the sheet, the outer ones 100 mm away from the edges. 7.2 Number of test specimens At least three test specimens and
41、one reference specimen shall be taken. 7.3 Dimensions of the test specimens Circular test specimens, which are adjusted to the dimensions of the cup (d 90 mm). The specified free surface of test specimen of 0,005 m is equivalent to d = 79,8 mm. 7.4 Conditioning of test specimens 7.4.1 Method A Store
42、 the test specimens mounted on the cup for at least 90 days at 23 C / 75 % R.H. before weighing the first time to the nearest 0,1 mg. 7.4.2 Method B After the test specimens are mounted on the cup, weigh the assembly to the nearest 0,1 mg and then store at 23 C / 75 % R.H. in the test chamber.Page 9
43、 EN 1931:2000 BSI 17 September 2001 8 Procedure 8.1 Test conditions Climatic chamber or evaporation area: (23 1) C / (75 2) % R.H. Convection: 0,02 to 0,3 m/s Closed absorption area of cup: (23 1) C / (0 + 1) % R.H. 8.2 Procedure Place a layer of desiccant (5.6) of approximately 12 mm thickness on t
44、he bottom of the cup (5.1). Leave a space of 3 mm to 4 mm between desiccant and specimen. Seal the test specimen in the cup and weigh to the nearest 0,1 mg. Place the cup in a constant-temperature, constant-humidity chamber (5.4) maintained at (23 1) C and (75 2) % relative humidity. Alternatively p
45、lace the cup in a desiccator containing the sodium chloride solution and place in a room or chamber maintained at a temperature of (23 1) C. Seal one test specimen in the cup without desiccant as a reference specimen and handle in the same way as the test specimens during the test procedure. For wat
46、erproofing sheets with a density of moisture flow rate anticipated to be less than 1,157 4 x 10 -8kg/(m.s), at intervals of one week, quickly remove the cup from the chamber (5.4) and store it in the test specimen transfer desiccator (5.5) at room temperature for (30 10) min; then weigh the cup to t
47、he nearest 0,1 mg. After weighing, shake the cup to mix the desiccant, then return the cup to the chamber. NOTE: It is not necessary to place the cup in the transfer desiccator (5.5) if conditioning and testing are conducted in the same constant temperature and humidity rooms. Plot the measured mass
48、 against time at weekly intervals and terminate the test when four consecutive points, excluding the initial weighing, lie on a straight line with a deviation of at most 5 %. Having a variation in barometric pressure the cup may act as an “air ship“ caused by buoyancy. For materials with a low density of moisture flow rate i.e. lower tha
