1、BS EN 12850:2009ICS 75.140; 91.100.50NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBRITISH STANDARDBitumen andbituminous binders Determination of thepH value of bituminousemulsionsBS 2000-488 :2009Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 04/08/2009 03:02, Uncont
2、rolled Copy, (c) BSIThis British Standardwas published under theauthority of the StandardsPolicy and StrategyCommittee on 30 April2009 BSI 2009ISBN 978 0 580 64098 8Amendments/corrigenda issued since publicationDate CommentsBS EN 12850:2009National forewordThis British Standard is the UK implementat
3、ion of EN 12850:2009. Itsupersedes BS EN 12850:2002 which is withdrawn.The UK participation in its preparation was entrusted to TechnicalCommittee PTI/13, Petroleum testing and terminology.A list of organizations represented on this committee can be obtained onrequest to its secretary.This publicati
4、on does not purport to include all the necessary provisionsof a contract. Users are responsible for its correct application.Compliance with a British Standard cannot confer immunityfrom legal obligations.Energy Institute, under the brand of IP, publishes and sells all Parts of BS 2000, and all BS EN
5、 petroleum test methods that would be Part of BS 2000, both in its annual publication “Standard methods for analysis and testing of petroleum and related products and British Standard 2000 Parts” and individually.Further information is available from: Energy Institute, 61 New Cavendish Street, Londo
6、n W1G 7AR. Tel: 020 7467 7100. Fax: 020 7255 1472.Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 04/08/2009 03:02, Uncontrolled Copy, (c) BSIBS EN 12850:2009EUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN 12850March 2009ICS 75.140; 91.100.50 Supersedes EN 12850:2002 English VersionBitumen
7、and bituminous binders - Determination of the pH valueof bituminous emulsionsBitumes et liants bitumineux - Dtermination du pH desmulsions de bitumeBitumen und bitumenhaltige Bindemittel - Bestimmung despH-Wertes von BitumenemulsionenThis European Standard was approved by CEN on 17 February 2009.CEN
8、 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-date lists and bibliographical references concerning such nationalstandards may be obtained on applic
9、ation 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 the responsibility of a CEN member into its own language and notified to the CEN Management Centre has
10、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, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portuga
11、l,Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGManagement Centre: Avenue Marnix 17, B-1000 Brussels 2009 CEN All rights of exploitation in any form and by any means reserve
12、dworldwide for CEN national Members.Ref. No. EN 12850:2009: ELicensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 04/08/2009 03:02, Uncontrolled Copy, (c) BSIBS EN 12850:2009EN 12850:2009 (E) 2 Contents Page Foreword 3 1 Scope 4 2 Normative references 4 3 Terms and definitions .4 4 Principle 4 5 R
13、eagents and materials 4 6 Apparatus .5 7 Sampling .5 8 Procedure .5 9 Expression of results 6 10 Precision .6 11 Test report 6 Bibliography 7 Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 04/08/2009 03:02, Uncontrolled Copy, (c) BSIBS EN 12850:2009EN 12850:2009 (E) 3 Foreword This document
14、(EN 12850:2009) has been prepared by Technical Committee CEN/TC 336 “Bituminous binders”, the secretariat of which is held by AFNOR. 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 September 2009,
15、 and conflicting national standards shall be withdrawn at the latest by September 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
16、. This document supersedes EN 12850:2002. From the previous edition, use of any cleaning agent enabling the dissolution of bitumen is now specified. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European
17、 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 and the United Kin
18、gdom. Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 04/08/2009 03:02, Uncontrolled Copy, (c) BSIBS EN 12850:2009EN 12850:2009 (E) 4 1 Scope This European Standard specifies a method for measuring the pH value of bituminous emulsions. It is applicable to anionic, cationic bituminous emulsion
19、s and bituminous emulsions prepared by means of non ionic surfactant. NOTE In certain circumstances, the pH value can provide an indication of the ionic character of a bitumen emulsion. However, this indication should be confirmed by a particle polarity test conforming to EN 1430 1. WARNING The use
20、of this standard can involve hazardous materials, operations and equipment. This standard does not purport to address all of the safety problems associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the appli
21、cability of regulatory limitations prior to use. 2 Normative references 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 an
22、y amendments) applies. EN 58, Bitumen and bituminous binders Sampling bituminous binders EN 12594, Bitumen and bituminous binders Preparation of test samples EN ISO 3696, Water for analytical laboratory use Specification and test methods (ISO 3696:1987) ISO 756-1, Propan-2-ol for industrial use Meth
23、ods of test - Part 1: General ISO 1388-1, Ethanol for industrial use Methods of test - Part 1: General ISO 5272, Toluene for industrial use Specifications ISO 5280, Xylene for industrial use Specification 3 Terms and definitions For the purposes of this document, the following terms and definitions
24、apply. 3.1 pH value negative logarithm to the base of 10 of the concentration of hydrogen ions in moles per litre of solution 4 Principle A pH meter and electrode are calibrated using standard buffer solutions. The pH value of the test solution is then determined. 5 Reagents and materials Use only r
25、eagents of recognised analytical grade and water conforming to grade 3 of EN ISO 3696. 5.1 Xylene or toluene, conforming respectively to ISO 5280 and ISO 5272, or any cleaning agent enabling the dissolution of the bitumen. Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 04/08/2009 03:02, Unco
26、ntrolled Copy, (c) BSIBS EN 12850:2009EN 12850:2009 (E) 5 5.2 Propan-2-ol or preferably ethanol, conforming respectively to ISO 756-1 and ISO 1388-1. NOTE If possible, the use of ethanol is preferable. It is however permissible to use other cleaning agent providing their effectiveness is established
27、. Reference to this shall be made in the test report as appropriate. 5.3 Standard buffer solutions, two, one buffer solution with a pH equal to 7,0 (for neutral electric balance), and an other solution getting closer to the expected pH. 5.4 Potassium chloride solution, 3 mol/l. 6 Apparatus Usual lab
28、oratory apparatus and glassware, together with a pH meter, with pH electrodes (combined or not). 7 Sampling The material under test shall be sampled in accordance with EN 58 and prepared in accordance with EN 12594. 8 Procedure Calibrate the pH meter and electrode according to the manufacturers inst
29、ructions using the standard buffer solutions (5.3). Gently stir the emulsion test sample and pour a sufficient quantity into a 250 ml glass beaker. Adjust the temperature of the emulsion test sample to (25 5) C, if necessary by cooling the sample. Rinse the electrode with water, wipe it and immerse
30、it in the emulsion test sample to the minimum depth recommended by the manufacturer. Read the indicated pH value when this becomes constant. If the pH value is not constant after 1 min, include this information in the test report. It is possible to indicate the approximate pH. Remove the electrode f
31、rom the emulsion test sample and clean it, using the following sequence of operations: wash with the aqueous phase of the emulsion if there is some; wash with water; wash with propan-2-ol or ethanol (5.2); wash with xylene or toluene (5.1 or any cleaning agent enabling the dissolution of the bitumen
32、; wash with propan-2-ol or ethanol (5.2); wash with water. Store the electrode in the potassium chloride solution (5.4). NOTE The instructions concerning electrode cleaning and storage are applied if there is no manufacturers information. Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 04/08/
33、2009 03:02, Uncontrolled Copy, (c) BSIBS EN 12850:2009EN 12850:2009 (E) 6 9 Expression of results Express the pH value to the nearest 0,1 pH unit. If the pH value is not constant after 1 min, report this information in the test report. 10 Precision NOTE The precision of this method has been estimate
34、d on the basis of experience. It may be necessary to modify the precision figures when the results of a statistically correct series of tests become available. 10.1 Repeatability The difference between two successive test results, obtained by the same operator with the same apparatus under constant
35、operating conditions on identical test material would, in the long run, in the normal and correct operation of the test method, exceed 0,3 pH unit in only one case in twenty. 10.2 Reproducibility The difference between two single and independent results obtained by different operators working in dif
36、ferent laboratories on identical test material would, in the long run, in the normal and correct operation of the test method, exceed 0,5 pH unit in only one case in twenty. 11 Test report The test report shall contain at least the following information: a) type and complete identification of the sa
37、mple under test; b) reference to this European Standard; c) any deviation, when use of other cleaning agent different than those recommended (see Clause 5); d) any variability of pH if it is not stable after one minute (see Clause 9); e) result of the test (see Clause 9); f) any deviation, by agreem
38、ent or otherwise, from the procedure specified; g) date of sampling, date of sample preparation and date of the test. Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 04/08/2009 03:02, Uncontrolled Copy, (c) BSIBS EN 12850:2009EN 12850:2009 (E) 7 Bibliography 1 EN 1430, Bitumen and bituminous
39、binders - Determination of particle polarity of bituminous emulsions Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 04/08/2009 03:02, Uncontrolled Copy, (c) BSIEnergy InstituteBuying Parts of BS 2000Orders for BS 2000 publications should be addressed to either:Energy Institute Library and In
40、formation Service61 New Cavendish StreetLondonW1G 7ARTel: +44 (0)20 7467 7100Fax: +44 (0)20 7255 1472www.energyinst.org.ukOrder standards securely via:www.energyinstpubs.org.ukor:British Standards Institution Customer Services389 Chiswick High RoadLondonW4 4ALTel: +44 (0)20 8996 9001Fax: +44 (0)20 8
41、996 7001www.bsi-Order hard copy standards securely via:www.bsi- exists in all BS 2000 publications. No part of this publication may be reproduced in any form without the prior permission in writing of BSI and the Energy Institute. Enquiries about copyright should be made to the Secretary of PTI/13 at the Energy Institute.PTI/13BS 2000 SeriesLicensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 04/08/2009 03:02, Uncontrolled Copy, (c) BSI
