1、BSI Standards PublicationBS EN ISO 25619-2:2015Geosynthetics Determination of compressionbehaviourPart 2: Determination of short-termcompression behaviourBS EN ISO 25619-2:2015 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of EN ISO 25619-2:2015. It supersedes BS EN
2、 ISO 25619-2:2008 which iswithdrawn.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 does not purport to include all the
3、necessary provisions of a contract. Users are responsible for its correct application. The British Standards Institution 2015.Published by BSI Standards Limited 2015ISBN 978 0 580 85363 0 ICS 59.080.70 Compliance with a British Standard cannot confer immunity from legal obligations.This British Stan
4、dard was published under the authority of the Standards Policy and Strategy Committee on 30 September 2015.Amendments/corrigenda issued since publicationDate T e x t a f f e c t e dEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 25619-2 September 2015 ICS 59.080.70 Supersedes EN ISO 25619-2
5、:2008English Version Geosynthetics - Determination of compression behaviour -Part 2: Determination of short-term compression behaviour (ISO 25619-2:2015) Gosynthtiques - Dtermination du comportement en compression - Partie 2: Dtermination du comportement la compression court terme (ISO 25619-2:2015)
6、 Geokunststoffe - Bestimmung des Druckverhaltens - Teil 2: Bestimmung des Kurzzeit-Druckverhaltens (ISO 25619-2:2015) This European Standard was approved by CEN on 8 August 2015. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this
7、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 official ver
8、sions (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 Austria
9、, 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, Sweden,
10、Switzerland, Turkey andUnited Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2015 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN nat
11、ional Members. Ref. No. EN ISO 25619-2:2015 EBS EN ISO 25619-2:2015EN ISO 25619-2:2015 (E) 3 European foreword This document (EN ISO 25619-2:2015) has been prepared by Technical Committee ISO/TC 221“Geosynthetics” in collaboration with Technical Committee CEN/TC 189 “Geosynthetics” the secretariatof
12、 which is held by NBN. This European Standard shall be given the status of a national standard, either by publication of anidentical text or by endorsement, at the latest by March 2016, and conflicting national standards shallbe withdrawn at the latest by March 2016. Attention is drawn to the possib
13、ility that some of the elements of this document may be the subject ofpatent rights. CEN and/or CENELEC shall not be held responsible for identifying any or all such patentrights. This document supersedes EN ISO 25619-2:2008. According to the CEN-CENELEC Internal Regulations, the national standards
14、organizations of thefollowing 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, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg
15、, Malta,Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland,Turkey and the United Kingdom.Endorsement notice The text of ISO 25619-2:2015 has been approved by CEN as EN ISO 25619-2:2015 without anymodification. BS EN ISO 25619-2:2015ISO 25619-2:2015(E)Forew
16、ord iv1 Scope . 12 Normative references 13 Terms and definitions . 14 Symbols and abbreviated terms . 25 Principle 26 Apparatus . 26.1 Compression testing machine 26.2 Measurement of displacement 26.3 Measurement of force . 26.4 Recording of measured values. 37 Specimens 37.1 Dimensions of specimens
17、 37.2 Preparation of specimens 47.3 Number of specimens . 47.4 Conditioning of specimens . 48 Test procedure 49 Calculation and expression of results . 59.1 General . 59.2 Short-term compressive strength and corresponding strain . 69.2.1 Short-term compressive strength . 69.2.2 Compressive strain. 6
18、9.3 Compressive strain at 1 MPa . 610 Test report . 7 ISO 2015 All rights reserved iiiContents PageBS EN ISO 25619-2:2015ISO 25619-2:2015(E)ForewordISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of prepari
19、ng 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 represented on that committee. International organizations, governmental and non-governmental, in lia
20、ison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.The procedures used to develop this document and those intended for its further maintenance are described in the ISO/IEC Dir
21、ectives, Part 1. In particular the different approval criteria needed for the different types of ISO documents should be noted. This document was drafted in accordance with the editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).Attention is drawn to the possibility that s
22、ome 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. Details of any patent rights identified during the development of the document will be in the Introduction and/or on the ISO list of patent decla
23、rations received (see www.iso.org/patents).Any trade name used in this document is information given for the convenience of users and does not constitute an endorsement.For an explanation on the meaning of ISO specific terms and expressions related to conformity assessment, as well as information ab
24、out ISOs adherence to the WTO principles in the Technical Barriers to Trade (TBT) see the following URL: Foreword - Supplementary informationThe committee responsible for this document is ISO/TC 221 Geosynthetics.This second edition cancels and replaces the first edition (ISO 25619-2:2008), which ha
25、s been technically revised.ISO 25619 consists 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 behaviouriv ISO 2015 All rights reservedBS EN ISO 25619-2:2015INTER
26、NATIONAL STANDARD ISO 25619-2:2015(E)Geosynthetics Determination of compression behaviour Part 2: Determination of short-term compression behaviour1 ScopeThis part of ISO 25619 specifies an index test method for determining the short-term compressive behaviour of geosynthetics. It can be used to det
27、ermine 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 referencesThe following documents, in whole or in part
28、, 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 amendments) applies.ISO 554, Standard atmospheres for conditioning and/o
29、r testing SpecificationsISO 7500-1, Metallic materials Verification of static uniaxial testing machines Part 1: Tension/compression testing machines Verification and calibration of the force-measuring systemISO 10318-1, Geosynthetics Part 1: Terms and definitions3 Terms and definitionsFor the purpos
30、es of this document, the terms and definitions given in ISO 10318 and the following apply.3.1initial thicknessdithickness measured in the direction of loading at a stress of 5 kPa3.2compressive strainmrratio of the decrease in thickness of the test specimen to its initial thickness, di(3.1) at failu
31、re/rupture, and expressed as a percentage3.3short-term compressive strengthmrratio of the maximum compressive force, Fmr, reached when the pressure at collapse is less than 1 MPa, to the initial cross-sectional area of the test specimenNote 1 to entry: See Figure 2. ISO 2015 All rights reserved 1BS
32、EN ISO 25619-2:2015ISO 25619-2:2015(E)4 Symbols and abbreviated termsA0initial cross-sectional area of the specimend thickness of the specimenF forceFmrmaximum compressive force at failure/ruptureFNapplied normal forceX displacementXdisplacement corresponding to a stress of 1 MPaXmaxdisplacement cor
33、responding to the maximum force reachedmrcompressive straincompressive strain at a given stress, 1,0compressive strain at a given stress of 1 MPamrshort-term compressive strength5 PrincipleA compressive force is applied in a testing machine according to ISO 7500-1, at a given rate of displacement, p
34、erpendicular to the major faces of a square or rectangular cut test specimen and 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 short-term compressive strength, mr, and the corresponding strain is reported. If no
35、 failure is observed before 1 MPa has been reached, the compressive strain at 1 MPa is calculated and its value reported.6 Apparatus6.1 Compression testing machineCompression testing machine in accordance with ISO 7500-1, Class 2 or higher, designed to suit the range of force and displacement involv
36、ed 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 platens shall be fixed. The movable platen shall be capable of moving at a constant rate of displacement, in accordance with Clause 8.6.2
37、 Measurement of displacementDisplacement measuring device, fitted to the compression testing machine, which allows continuous measurement of the displacement of the movable platen to an accuracy of 5 % or 0,1 mm, whichever is smaller.6.3 Measurement of forceSensor fitted to one of the machine platen
38、s to measure the force produced by the reaction of the specimen upon the platens. This sensor shall be such that its own deformation during the measuring operation is negligible compared with that being measured or, if not, it shall be taken into account by calculation. In addition, it shall allow c
39、ontinuous measurement of the force to an accuracy of 1 %.2 ISO 2015 All rights reservedBS EN ISO 25619-2:2015ISO 25619-2:2015(E)6.4 Recording of measured valuesDevice for the simultaneous recording of the force, F, and the displacement, X, which provides a curve of F as a function of X or as stress
40、versus strain (see Figure 3).7 Specimens7.1 Dimensions of specimensThe specimens shall fulfil the following criteria:a) the specimens shall be of rectangular or square 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
41、 only at discrete points or areas, a minimum of three complete points or areas in each direction shall be covered by the loading plate; see Figures 1 and 2.Specimens shall not be layered to produce a greater thickness for testing.Key1 metal top plate, smooth surface (same size as specimen or bigger)
42、2 metal base plate, smooth surface (bigger than top plate)d thickness of the specimenFNapplied normal forceFigure 1 Loading arrangement for e.g. single sided structured cores ISO 2015 All rights reserved 3BS EN ISO 25619-2:2015ISO 25619-2:2015(E)Key1 metal top plate, smooth surface (same size as spe
43、cimen or bigger)2 metal base plate, smooth surface (bigger than top plate)d thickness of the specimenFNapplied normal forceFigure 2 Loading arrangement for e.g. double sided structured cores7.2 Preparation of specimensSpecimens shall be cut so that their base is normal to the direction of compressio
44、n of the product in its intended use. The specimen shall be cut by methods that do not change the structure with regard to that of the original product.7.3 Number of specimensAt least five specimens shall be used. Use a new specimen for each test.7.4 Conditioning of specimensThe test specimens shall
45、 be conditioned and tested in the standard atmosphere for 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 % o
46、f the mass of the test specimen.Conditioning and/or testing 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.8
47、 Test procedurePlace the specimen centrally between the two platens of the compression testing machine. Preload with a pressure of (5 0,5) kPa.Compress the specimen with the movable platen at a constant rate of displacement equal to 0,1 diper minute (to within 25 %), where diis the initial thickness
48、 of the specimen.Continue compression 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 3.4 ISO 2015 All rights reservedBS EN ISO 25619-2:2015ISO 25619
49、-2:2015(E)Keycurves relating to different productsY stress in MPaX strain in %mrcompressive strain1,0strain at 1,0 MPamrshort-term compressive strengthFigure 3 Typical stressstrain curves of geospacers and determination of mrand 1,09 Calculation and expression of results9.1 GeneralThe results are the mean values of the measurements, which shall be expressed to three significant figures.Depending on the deformation behaviour, mrand mror 1,0at 1 MPa (see Clause 3) shall be calculated. ISO 2015 Al
