1、February 2008DEUTSCHE NORM English price group 11No part of this standard may be reproduced without prior permission ofDIN Deutsches Institut fr Normung e. V., Berlin. Beuth Verlag GmbH, 10772 Berlin, Germany,has the exclusive right of sale for German Standards (DIN-Normen).ICS 91.100.10!$LHA“141373
2、0www.din.deDDIN EN 196-7Methods of testing cement Part 7: Methods of taking and preparing samples of cementEnglish version of DIN EN 196-7:2008-02Prfverfahren fr Zement Teil 7: Verfahren fr die Probenahme und Probenauswahl von ZementEnglische Fassung DIN EN 196-7:2008-02SupersedesDIN EN 196-7:1990-0
3、3www.beuth.deDocument comprises 20 pagesDIN EN 196-7:2008-02 2 National foreword This standard has been prepared by Technical Committee CEN/TC 51 “Cement and building limes” (Secretariat: NBN, Belgium). The responsible German body involved in its preparation was the Normenausschuss Bauwesen (Buildin
4、g and Civil Engineering Standards Committee), Technical Committee 005-07-13 AA Zement. Amendments This standard differs from DIN EN 196-7:1990-03 as follows: 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 n
5、ot normatively listed within the document have been deleted from clause 2. d) In 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) In clause 4.2 (previously 4.1) reference to additional equipment has been deleted
6、 as it is now covered 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) In clause 5 restriction to sampling whilst fluidized has been deleted since many modern samplers ope
7、rate satisfactorily in such circumstances. h) In 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. Previous editions DIN 1164-2: 1970-06, 1978-11, 1990-03, 1
8、996-11 DIN EN 196: 1990-03 EUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN 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 dchan
9、tillonnage du ciment Probenahme 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 withou
10、t any alteration. Up-to-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 mad
11、e by translationunder the 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,
12、Germany, Greece, Hungary, 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 NORMUNG
13、Management Centre: rue de 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: EPrfverfahren fr Zement - Teil 7: Verfahren fr dieEN 196-7:2007 (E) 2 Contents Page Foreword. 3 1 Scope 4 2 Norma
14、tive references . 4 3 Terms and Definitions 4 4 General. 5 4.1 Purpose 5 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 transpor
15、t (after loading or before unloading) 7 6.4 Sampling while loading into bulk 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
16、of the homogenized sample 9 8.4 Foreign materials in the sample 10 9 Packaging 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.
17、11 10.3 Authorization of the report. 12 10.4 Dispatch of the report. 12 Bibliography . 18 DIN EN 196-7:2008-02 Annex A (informative) Typical examples of sampling equipment normally used 13 EN 196-7:2007 (E) 3 Foreword This document (EN 196-7:2007) has been prepared by Technical Committee CEN/TC 51 C
18、ement and building limes”, the secretariat of which is held by NBN. 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 2008, and conflicting national standards shall be withdrawn at the latest b
19、y June 2008. 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 196-7:1989. The text in this edition has been
20、 edited to take account of developments in European Standards for cement, methods of testing cement 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 re
21、levant; b) Object and field of application is now re-titled Scope; c) References not normatively 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) Clau
22、se 4.2 (previously 4.1) reference to additional equipment has been deleted as it is now covered 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 sam
23、pling whilst fluidized has been deleted since many modern samplers operate satisfactorily in such 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
24、sampled; According to the CEN/CENELEC Internal Regulations, the national standards organizations 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
25、, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. DIN EN 196-7:2008-02 EN 196-7:2007 (E) 4 1 Scope This European Standard describes the equipment to be used, the methods to be followed
26、 and the provisions for taking samples of cement, representative of given lots for testing, to assess the quality of 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 a
27、ny time with a standard; or b) requested for checking a delivery or a lot with a standard, the provisions of a contract 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) contain
28、ed in silos; d) contained in bags, canisters, drums or any other packages; e) transported in bulk in road vehicles, 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
29、 binders. 2 Normative references Not applicable. 3 Terms and Definitions For the purpose of this European Standard, 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
30、consist of one or more consignments spread over a period of time 3.2 consignment quantity of cement delivered at a 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
31、After specified tests this quantity is regarded as a whole as meeting or not meeting a standard, the provisions of a contract or the specification in an order. 3.4 increment quantity of cement taken in a single operation of the sampling equipment used DIN EN 196-7:2008-02 EN 196-7:2007 (E) 5 3.5 sam
32、ple quantity of cement taken at random, or in accordance with a sampling plan, from a larger quantity (silo, stock of bags, wagons, trucks, 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
33、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 immediately 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
34、 of the same cement, obtained by thoroughly mixing the combined spot samples and, if necessary, reducing the size of the resulting mixture 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 labo
35、ratories undertaking the tests 3.9 sample for retest sample which is to be kept for possible subsequent tests in the event of the results 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
36、large works), if necessary in the presence of all the parties concerned, to be retained for possible testing in the event of doubt or dispute 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 Pu
37、rpose 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 warehouse, 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 qual
38、ity is to be assessed. 4.2 Equipment The equipment used, methods followed, and precautions taken may vary according to the nature of the installation and the circumstances in which the samples are taken. DIN EN 196-7:2008-02 EN 196-7:2007 (E) 6 4.3 Representation In the case of taking delivery of su
39、pply, sampling should take place in the presence of representatives of the manufacturer (or vendor) and the customer (or purchaser). The absence of one of them 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
40、 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. 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
41、 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 recorded in the sampling report (see clause 10). When samples are taken after discharge or unloading, the recommendations in the first paragraph a
42、bove remain applicable. 5 Sampling equipment Industrial installations and the circumstances in which samples have to be taken are many and diverse. Consequently, it is not possible to specify a single type of reference equipment against which other types can be validated. Hence, this standard only g
43、ives, 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 either portable (ladle, tube, screw sampler, etc.) or permanently installed (screw extractor or other equipment fixed permanently onto the contai
44、ner). 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-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 t
45、aken 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 lubricants from other equipment used. NOTE However, cleaning is not necessary between taking successive increments from the same cement which are in
46、tended 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, observing the following precautions as appropriate. DIN EN 196-7:2008-02 EN 196-7:2007 (E) 7 6.2 Sampling from bags, drums and containers of
47、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 sufficiently large stock in order to meet the requirements of the second paragraph of 8.1. 6.3 Sampling from large containers and bul
48、k 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 thickness of the layer to be considered is at least 15 cm. Precautions to be taken include: a) not to operate in dusty or pollutin
49、g 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 airtight 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 equipment is available and if there is access to a homogeneous phase of cement. Take th
