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1、BS EN ISO 25619-2:2008 ICS 59.080.70 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW BRITISH STANDARD Geosynthetics Determination of compression behaviour Part 2: Determination of short- term compression behaviour (ISO 25619-2:2008) Licensed CopyChinese University of Hong Kong
2、, 13/06/2009 08:04, Uncontrolled Copy, (c) BSI This British Standard was published under the authority of the Standards Policy and Strategy Committee on 30 April 2009 BSI 2009 ISBN 978 0 580 57759 8 Amendments/corrigenda issued since publication DateComments BS EN ISO 25619-2:2008 National foreword
3、This British Standard is the UK implementation of EN ISO 25619-2:2008. The UK participation in its preparation was entrusted to Technical Committee B/553, Geotextiles and geomembranes. A list of organizations represented on this committee can be obtained on request to its secretary. This publication
4、 does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard cannot confer immunity from legal obligations. Licensed CopyChinese University of Hong Kong, 13/06/2009 08:04, Uncontrolled Copy, (c) BSI EUR
5、OPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 25619-2 December 2008 ICS 59.080.70 English Version Geosynthetics - Determination of compression behaviour - Part 2: Determination of short-term compression behaviour (ISO 25619-2:2008) Gosynthtiques - Dtermination du comportement en compression
6、- Partie 2: Dtermination du comportement la compression court terme (ISO/FDIS 25619-2:2008) Geokunststoffe - Bestimmung des Druckverhaltens - Teil 2: Bestimmung des Kurzzeit-Druckverhaltens (ISO 25619- 2:2008) This European Standard was approved by CEN on 29 November 2008. CEN members are bound to c
7、omply 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 standards may be obtained on application to the CEN Mana
8、gement 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 Management Centre has the same status as
9、the official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slov
10、akia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: Avenue Marnix 17, B-1000 Brussels 2008 CENAll rights of exploitation in any form and by any means reserved worldwide
11、for CEN national Members. Ref. No. EN ISO 25619-2:2008: E Licensed CopyChinese University of Hong Kong, 13/06/2009 08:04, Uncontrolled Copy, (c) BSI BS EN ISO 25619-2:2008 EN ISO 25619-2:2008 (E) 3 Foreword This document (EN ISO 25619-2:2008) has been prepared by Technical Committee CEN/TC 189 “Geos
12、ynthetics“, the secretariat of which is held by NBN, in collaboration with Technical Committee ISO/TC 221 “Geosynthetics“. 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 June 2009, and conflictin
13、g national standards shall be withdrawn at the latest by June 2009. 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 has
14、been prepared under a mandate given to CEN by the European Commission and the European Free Trade Association, and supports essential requirements of EC Directive(s). According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to imple
15、ment this European Standard: Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland
16、and the United Kingdom. Licensed CopyChinese University of Hong Kong, 13/06/2009 08:04, Uncontrolled Copy, (c) BSI BS EN ISO 25619-2:2008 ISO 25619-2:2008(E) ISO 2008 All rights reserved iii Contents Page Foreword iv 1 Scope 1 2 Normative references1 3 Terms, definitions and symbols.1 3.1 Terms and
17、definitions .1 3.2 Symbols2 4 Principle2 5 Apparatus .2 6 Specimens3 6.1 Dimensions of specimens 3 6.2 Preparation of specimens.4 6.3 Number of specimens .4 6.4 Conditioning of specimens.4 7 Test procedure.4 8 Calculation and expression of results.5 8.1 General5 8.2 Short-term compressive strength a
18、nd corresponding strain .6 8.3 Compressive strain at 1 MPa6 9 Test report7 Licensed CopyChinese University of Hong Kong, 13/06/2009 08:04, Uncontrolled Copy, (c) BSI BS EN ISO 25619-2:2008 ISO 25619-2:2008(E) iv ISO 2008 All rights reserved Foreword ISO (the International Organization for Standardiz
19、ation) 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 has the right to be
20、 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. International Standar
21、ds 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. Publication as an Intern
22、ational 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 rights. ISO 25619-2
23、was prepared by the European Committee for Standardization (CEN) Technical Committee CEN/TC 189, Geosynthetics, in collaboration with ISO Technical Committee ISO/TC 221, Geosynthetics, in accordance with the Agreement on technical cooperation between ISO and CEN (Vienna Agreement). ISO 25619 consist
24、s of the following parts, under the general title Geosynthetics Determination of compression behaviour: Part 1: Compressive creep properties Part 2: Determination of short-term compression behaviour Licensed CopyChinese University of Hong Kong, 13/06/2009 08:04, Uncontrolled Copy, (c) BSI BS EN ISO
25、25619-2:2008 INTERNATIONAL STANDARD ISO 25619-2:2008(E) ISO 2008 All rights reserved 1 Geosynthetics Determination of compression behaviour Part 2: Determination of short-term compression behaviour 1 Scope This part of ISO 25619 specifies an index test method for determining the short-term compressi
26、ve behaviour of geosynthetics. It can be used to determine the deformation behaviour under short-term compressive stress, e.g. after exposure to stress, liquids or light. This part of ISO 25619 can be used for quality control purposes. It is not intended to be used for design purposes. 2 Normative r
27、eferences The 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 referenced document (including any amendments) applies. ISO 554, Standard atmospheres for condi
28、tioning and/or testing Specifications ISO 7500-1, Metallic materials Verification of static uniaxial testing machines Part 1: Tension/compression testing machines Verification and calibration of the force-measuring system ISO 10318, Geosynthetics Terms and definitions 3 Terms, definitions and symbol
29、s 3.1 Terms and definitions For the purposes of this document, the terms and definitions given in ISO 10318 and the following apply. 3.1.1 compressive strain ratio of the decrease in thickness of the test specimen to its initial thickness, di, measured in the direction of loading at a pressure of 5
30、kPa NOTE Compressive strain is expressed as a percentage. 3.1.2 short-term compressive strength max,r ratio of the maximum compressive force, Fmax,r, to the initial cross-sectional area of the test specimen NOTE The maximum compressive force, Fmax,r, is reached when the pressure at collapse (see Fig
31、ure 2) is less than 1 MPa. Licensed CopyChinese University of Hong Kong, 13/06/2009 08:04, Uncontrolled Copy, (c) BSI BS EN ISO 25619-2:2008 ISO 25619-2:2008(E) 2 ISO 2008 All rights reserved 3.2 Symbols A0 initial cross-sectional area of the specimen d thickness of the specimen F force Fmax,r maxim
32、um compressive force at failure/rupture FN applied normal force X displacement X1,0 displacement corresponding to a stress of 1 MPa Xmax displacement corresponding to the maximum force reached compressive strain at a given stress, 1,0 compressive strain at a given stress of 1 MPa 4 Principle A compr
33、essive force is applied in a testing machine in accordance with ISO 7500-1, at a given rate of displacement, perpendicular to the major faces of the test specimen. The maximum stress supported by the specimen is recorded. When the value of the maximum stress is lower than 1 MPa, it is designated as
34、short-term compressive strength, max,r, and the corresponding strain is reported. If no failure is observed before 1 MPa has been reached, the compressive strain at 1 MPa is calculated and its value reported. 5 Apparatus 5.1 Compression testing machine. Compression testing machine in accordance with
35、 ISO 7500-1, designed to suit the range of force and displacement involved and having two rigid, plane, parallel loading platens with smooth surfaces and a minimum side length equal to the side length of the test specimen. One of the loading platens shall be fixed. The movable loading platen shall b
36、e capable of moving at a constant rate of displacement, in accordance with Clause 7. 5.2 Measurement device for displacement. Displacement measuring device, fitted to the compression testing machine, which allows continuous measurement of the displacement of the movable loading platen to an accuracy
37、 of 5 % or 0,1 mm, whichever is smaller (see 5.3). 5.3 Measurement device for force. Sensor fitted to one of the machine loading plates to measure the force produced by the reaction of the specimen upon the plates. This sensor shall be such that its own deformation during the measuring operation is
38、negligible compared with that being measured or, if not, it shall be taken into account by calculation. In addition, it shall allow continuous measurement of the force to an accuracy of 1 %. 5.4 Recording device for measured values. Device for the simultaneous recording of the force, F, and the disp
39、lacement, X, which provides a curve of F as a function of X or as stress versus strain (see Figure 2). Licensed CopyChinese University of Hong Kong, 13/06/2009 08:04, Uncontrolled Copy, (c) BSI BS EN ISO 25619-2:2008 ISO 25619-2:2008(E) ISO 2008 All rights reserved 3 6 Specimens 6.1 Dimensions of sp
40、ecimens The specimens shall fulfil the following criteria: a) the specimens shall be of rectangular shape and have a minimum size of 100 mm by 100 mm; b) if the product is structured in such a way that compressive loads are supported only at discrete points or areas, a minimum of three complete poin
41、ts or areas in each direction shall be covered by the loading plate; see Figures 1 a) and 1 b); c) the specimens shall be cut parallel to machine direction and cross-machine direction. Specimens shall not be layered to produce a greater thickness for testing. a) Example for single-sided structured c
42、ores b) Example for double-sided structured cores Key 1 metal top plate, smooth surface (same size as specimen or larger) 2 metal base plate, smooth surface (larger than top plate) d thickness of the specimen FN applied normal force Figure 1 Loading arrangements Licensed CopyChinese University of Ho
43、ng Kong, 13/06/2009 08:04, Uncontrolled Copy, (c) BSI BS EN ISO 25619-2:2008 ISO 25619-2:2008(E) 4 ISO 2008 All rights reserved 6.2 Preparation of specimens Specimens shall be cut so that their base is normal to the direction of compression of the product in its intended use. The specimen shall be c
44、ut by methods that do not change the structure with regard to that of the original product. 6.3 Number of specimens At least five specimens shall be used. Use a new specimen for each test. 6.4 Conditioning of specimens The test specimens shall be conditioned and tested in the standard atmosphere for
45、 testing (20 C 2 C at 65 % 5 % relative humidity), as specified in ISO 554. The specimens can be considered to have been conditioned when the change in mass in successive weighings made at intervals of not less than 2 h does not exceed 0,25 % of the mass of the test specimen. Conditioning and/or tes
46、ting in the standard atmosphere may only be omitted when it can be shown that results obtained for the same specific type of product (both structure and polymer type) are not affected by changes in temperature and humidity exceeding the limits. 7 Test procedure Place the specimen centrally between t
47、he two loading plates of the compression testing machine. Preload with a pressure of (5 0,5) kPa. Compress the specimen with the movable loading plate at a constant rate of displacement equal to 0,1di per minute (to within 25 %), where di is the initial thickness of the specimen. Continue compressio
48、n until the specimen collapses, providing a compressive strength value, or until the defined stress has been reached. Plot the forcedisplacement or stressstrain curve. An example is presented in Figure 2. Licensed CopyChinese University of Hong Kong, 13/06/2009 08:04, Uncontrolled Copy, (c) BSI BS E
49、N ISO 25619-2:2008 ISO 25619-2:2008(E) ISO 2008 All rights reserved 5 Key X compressive strain, in percent (%) Y stress, in megapascals (MPa) 1 curves relating to different products max,r strain at rupture 1,0 strain at 1,0 MPa max,r short-term compressive strength Figure 2 Typical stressstrain curves of geospacers and determination of max,r and 1,0 8 Calculation and expression of results 8.1 General The results are the mean values of the measurements, which shall be expressed to th