EN 196-7-2007 en Methods of testing cement - Part 7 Methods of taking and preparing samples of cement《测试水泥的方法 第7部分 水泥试样的取样和准备方法》.pdf

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1、BRITISH STANDARDBS EN 196-7:2007Methods of testing cement Part 7: Methods of taking and preparing samples of cementICS 91.100.10g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g

2、60g53g44g42g43g55g3g47g36g58BS EN 196-7:2007This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 January 2008 BSI 2008ISBN 978 0 580 57560 0National forewordThis British Standard is the UK implementation of EN 196-7:2007. It supersedes BS EN 19

3、6-7:1992 which is withdrawn.The UK participation in its preparation was entrusted by Technical Committee B/516, Cement and lime, to Subcommittee B/516/12, Sampling and testing.A list of organizations represented on this committee can be obtained on request to its secretary.This publication does not

4、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.Amendments/corrigenda issued since publicationDate CommentsEUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORM

5、EN 196-7December 2007ICS 91.100.10 Supersedes EN 196-7:1989 English VersionMethods of testing cement - Part 7: Methods of taking andpreparing samples of cementMthodes dessai des ciments - Partie 7: Mthodes deprlvement et dchantillonnage du cimentPrfverfahren fur Zement - Teil 7: Verfahren fur diePro

6、benahme und Probenauswahl von ZementThis European Standard was approved by CEN on 24 October 2007.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-

7、date lists and bibliographical references concerning such nationalstandards may be obtained on application to the CEN Management 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 translationunder th

8、e responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as theofficial versions.CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,France, Germany, Greece, Hungary

9、, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGManagement Centre: rue d

10、e Stassart, 36 B-1050 Brussels 2007 CEN All rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 196-7:2007: EEN 196-7:2007 (E) 2 Contents Page Foreword. 3 1 Scope 4 2 Normative references . 4 3 Terms and Definitions 4 4 General. 5 4.1 Purpose 5

11、4.2 Equipment 5 4.3 Representation 6 5 Sampling equipment. 6 6 Procedures for taking samples . 6 6.1 General. 6 6.2 Sampling from bags, drums and containers of small size . 7 6.3 Sampling from large containers and bulk transport (after loading or before unloading) 7 6.4 Sampling while loading into b

12、ulk transports or silos . 7 6.5 Sampling from silos 7 7 Frequency at which samples are taken and choice of sample type 7 8 Size and preparation of samples. 8 8.1 Size of sample to be taken . 8 8.2 Homogenization 8 8.3 Division of the homogenized sample 9 8.4 Foreign materials in the sample 10 9 Pack

13、aging and storage. 10 9.1 Principle . 10 9.2 Containers . 10 9.3 Storage condition 11 9.4 Identification of samples 11 9.5 Authentication of samples . 11 10 Sampling report. 11 10.1 General. 11 10.2 Information to be included. 11 10.3 Authorization of the report. 12 10.4 Dispatch of the report. 12 A

14、nnex A (informative) Typical examples of sampling equipment normally used 13 Bibliography . 18 EN 196-7:2007 (E) 3 Foreword This document (EN 196-7:2007) has been prepared by Technical Committee CEN/TC 51 Cement and building limes”, the secretariat of which is held by NBN. This European Standard sha

15、ll be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by June 2008, and conflicting national standards shall be withdrawn at the latest by June 2008. Attention is drawn to the possibility that some of the elements of this document

16、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 196-7:1989. The text in this edition has been edited to take account of developments in European Standards for cement, methods of testing c

17、ement and specifications for conformity evaluation. No technical changes have been made to the text of EN 196-7:1989. The main editorial changes are: a) Brief history has been deleted as it was no longer relevant; b) Object and field of application is now re-titled Scope; c) References not normative

18、ly listed within the document have been deleted from clause 2; d) Clause 3.8 reference to certification regulations has been deleted as this is now covered in EN 197-2 and Annex ZA of EN 197-1:2000; e) Clause 4.2 (previously 4.1) reference to additional equipment has been deleted as it is now covere

19、d in EN 197-2 and in guidance document PD CR 14245; f) Reference to responsibility regarding sampling (previously clause 4.3) has been deleted as it is now covered in EN 197-2 g) Clause 5 restriction to sampling whilst fluidized has been deleted since many modern samplers operate satisfactorily in s

20、uch circumstances; h) Clause 6 (previously 6.7) reference to sampling from bag filling machines has been deleted as being in conflict with the requirements in many specifications for only filled bags to be sampled; According to the CEN/CENELEC Internal Regulations, the national standards organizatio

21、ns of the following countries are bound to implement 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,

22、 Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. EN 196-7:2007 (E) 4 1 Scope This European Standard describes the equipment to be used, the methods to be followed and the provisions for taking samples of cement, representative of given lots for testing, to assess the quality o

23、f products prior to, during or after delivery. The provisions of this standard are only applicable when samples of cement are: a) required for evaluating the conformity of a cement at any time with a standard; or b) requested for checking a delivery or a lot with a standard, the provisions of a cont

24、ract or the specification in an order. The standard is applicable to the taking of samples of all types of cements defined by European Standards for cements whether they are: c) contained in silos; d) contained in bags, canisters, drums or any other packages; e) transported in bulk in road vehicles,

25、 railway wagons, ships, etc. NOTE The requirements of this standard can also, by agreement between the parties, be followed for acceptance inspections for all non-standardized hydraulic binders. 2 Normative references Not applicable. 3 Terms and Definitions For the purpose of this European Standard,

26、 the following terms and definitions apply. 3.1 order quantity of cement covered by a single requisition placed with a single manufacturer, factory, depot or dispatching centre. It may consist of one or more consignments spread over a period of time 3.2 consignment quantity of cement delivered at a

27、given time by a single manufacturer, factory, depot or dispatching centre. It may consist of one or more lots 3.3 lot quantity of cement produced under conditions presumed uniform NOTE After specified tests this quantity is regarded as a whole as meeting or not meeting a standard, the provisions of

28、a contract or the specification in an order. 3.4 increment quantity of cement taken in a single operation of the sampling equipment used EN 196-7:2007 (E) 5 3.5 sample quantity of cement taken at random, or in accordance with a sampling plan, from a larger quantity (silo, stock of bags, wagons, truc

29、ks, etc.) or from a fixed lot, relating to the intended tests. A sample may consist of one or more increments 3.6 spot sample sample taken within a short period of time and at a fixed point from within a larger quantity, relating to the intended tests. It can be obtained by combining one or more imm

30、ediately consecutive increments 3.7 composite sample homogeneous mixture of spot samples taken: a) at different points; or b) at different times; from a larger mass of the same cement, obtained by thoroughly mixing the combined spot samples and, if necessary, reducing the size of the resulting mixtu

31、re 3.8 laboratory sample sample prepared by thoroughly mixing and if necessary reducing from a larger sample (spot or composite sample) and intended for use by laboratories undertaking the tests 3.9 sample for retest sample which is to be kept for possible subsequent tests in the event of the result

32、s from tests carried out on laboratory samples being in doubt or disputed 3.10 retained sample sample taken systematically from regular deliveries (for example for large works), if necessary in the presence of all the parties concerned, to be retained for possible testing in the event of doubt or di

33、spute or subsequent problems NOTE Definitions 3.1, 3.2, 3.3 and 3.10 only have meaning in the case of checks made when taking delivery of a supply. 4 General 4.1 Purpose The purpose of the sampling operations is to obtain from a large quantity of cement (contained in a silo, a stock of bags in a war

34、ehouse, truck, etc., or in a defined lot), one or more smaller quantities, considered by the parties concerned to represent the quantity of cement of which the quality is to be assessed. 4.2 Equipment The equipment used, methods followed, and precautions taken may vary according to the nature of the

35、 installation and the circumstances in which the samples are taken. EN 196-7:2007 (E) 6 4.3 Representation In the case of taking delivery of supply, sampling should take place in the presence of representatives of the manufacturer (or vendor) and the customer (or purchaser). The absence of one of th

36、em should not, however, be a barrier to sampling but if this occurs it should be recorded in the sampling report (see clause 10). The sample is normally taken before or during discharge or unloading. However, if necessary, it may be taken after discharge or unloading but with a maximum delay of 24 h

37、. In this latter case the results of the checks shall be interpreted with care. NOTE For various reasons, the cement to be tested may no longer be representative of the product at the time of its discharge or unloading, when a delay in sampling occurs. In all cases, the time of sampling shall be rec

38、orded in the sampling report (see clause 10). When samples are taken after discharge or unloading, the recommendations in the first paragraph above remain applicable. 5 Sampling equipment Industrial installations and the circumstances in which samples have to be taken are many and diverse. Consequen

39、tly, it is not possible to specify a single type of reference equipment against which other types can be validated. Hence, this standard only gives, by way of example in Annex A, a simplified illustration of the devices normally used and which have been found to be satisfactory. This equipment is ei

40、ther portable (ladle, tube, screw sampler, etc.) or permanently installed (screw extractor or other equipment fixed permanently onto the container). The equipment shall be chosen and used in accordance with the following requirements. The equipment shall be: a) approved by all the parties; b) of non

41、-corrodible material, which is not liable to react with the cement; c) maintained always in working order and in a clean state. Care shall be taken to ensure that it is carefully cleaned after each sampling operation (see Note). Care shall also be taken to ensure that it is not contaminated by lubri

42、cants from other equipment used. NOTE However, cleaning is not necessary between taking successive increments from the same cement which are intended for making up the sample. 6 Procedures for taking samples 6.1 General The most suitable equipment for the circumstances shall be used to take a sample

43、, observing the following precautions as appropriate. EN 196-7:2007 (E) 7 6.2 Sampling from bags, drums and containers of small size When the cement is packed in bags, drums or other small containers, the sample shall comprise one or more bags, drums or containers chosen at random from a sufficientl

44、y large stock in order to meet the requirements of the second paragraph of 8.1. 6.3 Sampling from large containers and bulk transport (after loading or before unloading) For all equipment used, care shall be taken not to take material from the top or bottom layers of the mass of cement. The thicknes

45、s of the layer to be considered is at least 15 cm. Precautions to be taken include: a) not to operate in dusty or polluting atmospheres; b) take the number of samples necessary to obtain the quantity prescribed in the second paragraph of 8.1; c) transfer the collected cement into clean, dry and airt

46、ight containers before proceeding with the operations described in clause 8. NOTE The equipment described in this standard (see Annex A) does not allow for sample(s) to be taken during unloading. 6.4 Sampling while loading into bulk transports or silos Sampling may be carried out only if suitable eq

47、uipment is available and if there is access to a homogeneous phase of cement. Take the same precautions as those described in 6.3a), b) and c). 6.5 Sampling from silos When sampling from a silo, an appropriate quantity of cement shall be discarded to remove the hard deposits or unwanted mixtures of

48、different cements that may be in the distribution system. The quantity to be discarded is at the discretion of the manufacturers representative present during the sampling operation. The necessary quantity prescribed in the second paragraph of 8.1 shall then be collected in clean and dry containers.

49、 7 Frequency at which samples are taken and choice of sample type The frequency of taking samples and the type of sample (spot sample or composite sample) depends on the provisions in: agreements between producer and customer; national or European Standard. EN 196-7:2007 (E) 8 8 Size and preparation of samples 8.1 Size of sample to be taken Each laboratory sample (or sample for retest or retained sample) shall be of such a size that all the tests wherever specified can be carried out twice. NOTE In general, laboratory samples of at least 5 kg in mass tend to b