1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS EN 12311-2:2013Flexible sheets forwaterproofing Determination of tensilepropertiesPart 2: Plastic and rubber sheets for roofwaterproofingBS EN 12311-2:2013 BRITISH STANDARDNat
2、ional forewordThis British Standard is the UK implementation of EN 12311-2:2013.It supersedes BS EN 12311-2:2010 which is withdrawn.The UK participation in its preparation was entrusted to TechnicalCommittee B/546, Flexible sheets for waterproofing and watervapour control.A list of organizations rep
3、resented on this committee can beobtained on request to its secretary.This publication does 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
4、 80229 4ICS 91.100.50Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of theStandards Policy and Strategy Committee on 30 June 2013.Amendments issued since publicationDate Text affectedBS EN 12311-2:2013EUROPEAN S
5、TANDARD NORME EUROPENNE EUROPISCHE NORM EN 12311-2 May 2013 ICS 91.100.50 Supersedes EN 12311-2:2010English Version Flexible sheets for waterproofing - Determination of tensile properties - Part 2: Plastic and rubber sheets for roof waterproofing Feuilles souples dtanchit - Dtermination des proprits
6、 en traction - Partie 2 : Feuilles dtanchit de toiture plastiques et lastomres Abdichtungsbahnen - Bestimmung des Zug-Dehnungsverhaltens - Teil 2: Kunststoff- und Elastomerbahnen fr Dachabdichtungen This European Standard was approved by CEN on 28 March 2013. CEN members are bound to comply with the
7、 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 standards may be obtained on application to the CEN-CENELEC Management
8、 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 and notified to the CEN-CENELEC Management Centre has the same status a
9、s 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, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Ne
10、therlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: Avenue Marnix 17, B-1000 Brussels 2013 CEN All rights of ex
11、ploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 12311-2:2013: EBS EN 12311-2:2013EN 12311-2:2013 (E) 2 Contents Page Foreword 3 Introduction .4 1 Scope 5 2 Normative references 5 3 Terms and definitions .5 4 Principle 5 5 Apparatus .5 6 Sampling .6 7
12、Preparation of test specimens .6 8 Procedure .7 9 Expression of results 8 9.1 Evaluation .8 9.2 Precision of the test method 9 10 Test report 9 Bibliography . 10 BS EN 12311-2:2013EN 12311-2:2013 (E) 3 Foreword This document (EN 12311-2:2013) has been prepared by Technical Committee CEN/TC 254 “Flex
13、ible sheets for waterproofing”, the secretariat of which is held by NEN. 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 November 2013, and conflicting national standards shall be withdrawn at the
14、 latest by November 2013. 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 12311-2:2010. This document has
15、been technically and editorially revised in order to: adjust the separation speed to CEN TC 189 standards; add precision data of a Round Robin test. This document has been prepared under a mandate given to CEN by the European Commission and the European Free Trade Association. According to the CEN-C
16、ENELEC Internal Regulations, the national standards organisations 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 Macedonia, France, Germany, Greece, Hungary,
17、 Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. BS EN 12311-2:2013EN 12311-2:2013 (E) 4 Introduction This European Standard is intended for characterisation
18、of plastic and rubber sheets as manufactured or supplied before use. This test method relates exclusively to products, or to their components where appropriate, and not to waterproofing membrane systems composed of such products and installed in the works. This test is intended to be used in conjunc
19、tion with European Standards on product characteristics for plastic and rubber sheets for waterproofing. BS EN 12311-2:2013EN 12311-2:2013 (E) 5 1 Scope This European Standard specifies test methods for the determination of the tensile properties of plastic and rubber sheets for roof waterproofing.
20、2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amend
21、ments) applies. EN 1849-2, Flexible sheets for waterproofing Determination of thickness and mass per unit area Part 2: Plastic and rubber sheets EN 13416, Flexible sheets for waterproofing Bitumen, plastic and rubber sheets for roof waterproofing Rules for sampling EN ISO 7500-1, Metallic materials
22、Verification of static uniaxial testing machines Part 1: Tension/compression testing machines Verification and calibration of the force-measuring system (ISO 7500-1) 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 top surface upper side of th
23、e sheet, as used in situ Note 1 to entry: This is usually the inside of the roll. 3.2 maximum tensile force largest value of tensile force recorded during testing 3.3 elongation at maximum tensile force elongation of the test specimen at the maximum tensile force 3.4 elongation at break elongation o
24、f the test specimen at rupture 4 Principle A test specimen is stretched at a constant speed until it ruptures. The force and elongation is continuously recorded throughout the test, and preferably with a permanent record of the maximum tensile force. 5 Apparatus Tensile testing machine equipped with
25、 a continuous recording of force and corresponding elongation and capable of maintaining a uniform speed of grip separation as specified below. BS EN 12311-2:2013EN 12311-2:2013 (E) 6 The tensile testing machine shall have a sufficient loading capacity of at least 2000 N and a grip separation speed
26、of (5 1, 100 10 and 500 50) mm/min. The width of grips shall not be less than the width of the test specimen. The tensile testing machine shall be equipped with grips of a type which maintain or increase the clamping pressure as a function of the increase of the tensile force applied to the test spe
27、cimen. The test specimen shall be held so that it does not slip in the grips more than 1 mm for products up to and including 3 mm thick, and 2 mm for thicker products. A mark or tape on the test specimen where it enters the grips will help reveal any slip. The method of gripping shall not induce pre
28、mature rupture close to the grips. If the slippage from the grips exceeds the stated limits or for the method B (dumb-bell type), the actual elongation of the test specimen shall be measured with an extensometer. The force measuring system shall meet at least Class 2 of EN ISO 7500-1 (i.e. 2 %). 6 S
29、ampling Samples shall be taken in accordance with EN 13416. 7 Preparation of test specimens Unless otherwise specified, for a complete tensile test two sets of test specimens shall be prepared: a set of five for the longitudinal direction and a set of five for the transverse direction. Test specimen
30、s shall be cut from a test piece not closer than (100 10) mm from the edge of the sheet, with the aid of a template, or die cutter as follows: method A: rectangular type (50 0,5) mm x 200 mm according to Figure 1 and Table 1; method B: dumb-bell type (6 0,4) mm x 115 mm according to Figure 2 and Tab
31、le 1 or rectangular type (15 0,5) mm x 170 mm according to Figure 1 and Table 1. Any non-permanent surface layer should be removed. A set of test specimens (longitudinal or transverse direction) with a mesh or fabric internal layer, backing or laminated reinforcement shall have the same number of th
32、reads. Cutting of threads should be avoided. Condition the test specimens, prior to testing, for at least 20 h in a standard atmosphere of (23 2) C and (50 5) % relative humidity. The tensile properties shall be determined in accordance with method A with the following exceptions: For sheet with a n
33、on-woven inner layer (e.g. fibre glass mat) of less than or equal to 80g/m, method B the dumb-bell type (see Figure 2 and Table 1) shall be used. For determining tensile properties (young modulus/ secant modulus), e.g. for EN 1548 and for determining tensile properties in accordance with EN 1847, me
34、thod B with a 15 mm rectangular specimen shall be used. BS EN 12311-2:2013EN 12311-2:2013 (E) 7 8 Procedure In the case of method B, the thickness is measured as the effective thickness of the sheet according to EN 1849-2. The test specimen shall be tightly clamped in the tensile test machine grips
35、(Clause 5) taking care that the longitudinal axis of the test specimens and the axis of the testing machine and grips are correctly aligned. A preload of maximum 5 N before the start of the test is recommended to take out any slack in the test specimen. The test is carried out on a test specimen at
36、a temperature of (23 2) C. A constant separating speed for the grips of (100 10) mm/min with the following exceptions has to be used: For products with a declared value (e.g. MLV or MDV) for the elongation with more than 400 %, a constant separation speed of 500 mm/min has to be used. For the young
37、modulus, which is defined as secant modulus between 1 % and 2 % strain, shall be deduced from the stress-strain curve when a separation speed of (5 1) mm/min has been used. The applied tensile force and the distance between the grips or the distance between the gauge marker for the rectangular type
38、or the distance between the gauge marks for the dumb-bell types shall be recorded until the test specimen breaks. The mode of failure of the specimen shall be noted. In the case of sheets with composite reinforcements, which give rise to two or more distinct peaks on the force/elongation curve, the
39、force and elongation of the two greatest peaks and also the elongation at break shall be recorded. Key 1 gauge mark Figure 1 Rectangular test specimen for method A and method B BS EN 12311-2:2013EN 12311-2:2013 (E) 8 Key 1 gauge mark Figure 2 Dumb- bell test specimen for method B Table 1 Test specim
40、en data Method A Method B Method B Dumb-bell Rectangular (mm) (mm) (mm) Overall length, min (L3) 200 115 170 Width of ends (b1) 25 1 Length of narrow parallel portion (L1) 33 2 Width (b) 50 0,5 6 0,4 15 0,1 Small radius (r) 14 1 Large radius (R) 25 2 Distance between gauge marks (L0) 100 15 25 1 100
41、 15 Initial distance between grips (L2) 120 5 80 5 120 5 If no rupture occurs within 1000 mm displacement of the grips then the distance between the grips (L2) may be reduced to (70 5) mm and the distance between gauge marks (L0) to (50 5) mm. 9 Expression of results 9.1 Evaluation Determine the max
42、imum force and the corresponding elongation calculated from the separation of the tensile testing machine grips or gauge marks and expressed as a percentage of the original gauge length. BS EN 12311-2:2013EN 12311-2:2013 (E) 9 Disregard any test result where the test specimen breaks within 10 mm fro
43、m the grips or when it slips by more than the permitted limit within the grips of the tensile testing machine, and retest with a replacement specimen. The maximum tensile force and corresponding elongation and the elongation at break are noted, together with the direction of test. State the method o
44、f measurement of elongation, i.e. grip separation or extensometer. List the individual values for the test specimens in each direction and calculate the arithmetic mean and standard deviation of tensile force in N/50 mm for method A and tensile stress in N/mm2for method B. The tensile stress (N/mm2)
45、 shall be calculated based on the effective sheet thickness (EN 1849-2) of the specimen. State the result to the nearest N/50 mm for method A, to the nearest 0,1 N/mm2for method B and elongation with two significant figures. 9.2 Precision of the test method Precision data are based on a Round Robin
46、test involving nine European laboratories. Reinforced PVC-p membranes were tested according to method A. The Round Robin was performed according to ISO Guide 43-1 and the values were determined according to ISO 13528. Repeatability limit r: Limit for a probability of 95 % for results obtained with t
47、he same method on identical test items in the same lab, same operator and same equipment within a short time. Reproducibility limit R: Limit for a probability of 95 % for results obtained with the same method on identical test items in different labs, different operators and different equipments. Ta
48、ble 2 Round Robin results Property Unit General mean Repeatability limit r Reproducibility limit R Tensile strain at maximum force % 19,7 1,3 4,2 Maximum tensile force N/50 mm 1 224 75 170 10 Test report The test report shall include at least the following information: a) reference to this document
49、(EN 12311-2) and any deviation from it; b) all details necessary to identify the product tested; c) information on sampling in accordance with EN 13416; d) details of preparation of the test specimen in accordance with Clause 7, e.g. number of load-bearing threads; e) test results in accordance with Clause 9, noting if the distance between the grips has been reduced and noting the separation speed; f) any peculiarities in the method employed or encountered during the test
