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1、 ，如果你需要更多标准可以到 如果你购买的文档存在缺页、字迹模糊、乱码等情况，请大家通过论坛消息与我联系。BRITISH STANDARDBS EN 12850:2009BS 2000-488:2009Bitumen andbituminous binders Determination of the pH value of bituminous emulsionsICS 75.140; 91.100.50NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBS EN 12850:2009National
2、forewordThis British Standard is the UK implementation of EN 12850:2009. It supersedes BS EN 12850:2002 which is withdrawn.The UK participation in its preparation was entrusted to TechnicalCommittee PTI/13, Petroleum testing and terminology.Energy Institute, under the brand of IP, publishes and sell
3、s all Parts ofBS 2000, and all BS EN 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” andindividually.Further information is available from:Energy Institu
4、te, 61 New Cavendish Street, London W1G 7AR. Tel: 020 7467 7100. Fax: 020 7255 1472.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 necessary provisions of a contract. Users are responsible for its
5、 correct application.Compliance with a British Standard cannot confer immunity from legal obligations.This British Standard was published under the authority of the Standards Policy and Strategy Committee on 30 April2009 BSI 2009ISBN 978 0 580 64098 8Amendments/corrigenda issued since publicationDat
6、e CommentsBS EN 12850:2009EUROPEAN STANDARD NORME EUROPENNEEUROPISCHE NORMEN 12850March 2009ICS 75.140; 91.100.50Supersedes EN 12850:2002English VersionBitumen and bituminous binders - Determination of the pH value of bituminous emulsionsBitumes et liants bitumineux - Dtermination du pH des mulsions
7、 de bitumeBitumen und bitumenhaltige Bindemittel - Bestimmung des pH-Wertes von BitumenemulsionenThis European Standard was approved by CEN on 17 February 2009.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard t
8、he 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 Management Centre or to any CEN member.This European Standard exists in three official versions (English, French, Germ
9、an). 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 the official versions.CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Re
10、public, 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 United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATION C OM I T EUR OP
11、 EN DE NOR M AL I S ATI ON EUR OP I S C HES KOM I TEE F R NOR M UNG Management Centre: Avenue Marnix 17, B-1000 Brussels 2009 CENAll rights of exploitation in any form and by any means reserved worldwide for CEN national Members.Ref. No. EN 12850:2009: EContentsPageForeword.31Scope .42Normative refe
12、rences .43Terms and definitions .44Principle .45Reagents and materials .46Apparatus .57Sampling .58Procedure .59Expression of results .610Precision .611Test report .6Bibliography .77BS EN 12850:2009EN 12850:2009 (E)ForewordThis document (EN 12850:2009) has been prepared by Technical Committee CEN/TC
13、 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, and conflicting national standards shall be withdrawn at the la
14、test 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.This document supersedes EN 12850:2002.From the previous edition
15、, 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 followingcountries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denma
16、rk, 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 Kingdom.1ScopeThis European Standard specifies a method for measuring t
17、he pH value of bituminous emulsions.It is applicable to anionic, cationic bituminous emulsions and bituminous emulsions prepared by means of non ionic surfactant.NOTEIn certain circumstances, the pH value can provide an indication of the ionic character of a bitumen emulsion. However, this indicatio
18、n should be confirmed by a particle polarity test conforming to EN 1430 1.WARNING The use 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
19、this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.2Normative referencesThe following referenced documents are indispensable for the application of this document. For dated references, only the edition cited appli
20、es. For undated references, the latest edition of the referenced document (including any amendments) applies.EN 58, Bitumen and bituminous binders Sampling bituminous bindersEN 12594, Bitumen and bituminous binders Preparation of test samplesEN ISO 3696, Water for analytical laboratory use Specifica
21、tion and test methods (ISO 3696:1987)ISO 756-1, Propan-2-ol for industrial use Methods of test - Part 1: General ISO 1388-1, Ethanol for industrial use Methods of test - Part 1: General ISO 5272, Toluene for industrial use SpecificationsISO 5280, Xylene for industrial use Specification3Terms and def
22、initionsFor the purposes of this document, the following terms and definitions apply.3.1pH valuenegative logarithm to the base of 10 of the concentration of hydrogen ions in moles per litre of solution4PrincipleA pH meter and electrode are calibrated using standard buffer solutions. The pH value of
23、the test solution is then determined.5Reagents and materialsUse only reagents of recognised analytical grade and water conforming to grade 3 of EN ISO 3696.5.1Xylene or toluene, conforming respectively to ISO 5280 and ISO 5272, or any cleaning agent enabling the dissolution of the bitumen.5.2Propan-
24、2-ol or preferably ethanol, conforming respectively to ISO 756-1 and ISO 1388-1.NOTEIf possible, the use of ethanol is preferable.It is however permissible to use other cleaning agent providing their effectiveness is established. Reference to this shall be made in the test report as appropriate.5.3S
25、tandard 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.5.4Potassium chloride solution, 3 mol/l.6ApparatusUsual laboratory apparatus and glassware, together with a pH meter, with pH electrodes (
26、combined or not).7SamplingThe material under test shall be sampled in accordance with EN 58 and prepared in accordance withEN 12594.8ProcedureCalibrate the pH meter and electrode according to the manufacturers instructions using the standard buffer solutions (5.3).Gently stir the emulsion test sampl
27、e 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 it in the emulsion test sample to the minimum depth recommended by the manufacturer. Read
28、 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 from the emulsion test sample and clean it, using the following sequence of operations: was
29、h 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; wash with propan-2-ol or ethanol (5.2); wash with water.Store the electrode in the potas
30、sium chloride solution (5.4).NOTEThe instructions concerning electrode cleaning and storage are applied if there is no manufacturers information.9Expression of resultsExpress 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 rep
31、ort.10 PrecisionNOTEThe precision of this method has been estimated 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 RepeatabilityThe difference between two successive test results, obtai
32、ned by the same operator with the same apparatus under constant 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 ReproducibilityThe difference between two single and inde
33、pendent results obtained by different operators working in different 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 reportThe test report shall contain at least the followin
34、g information: a)type and complete identification of the sample 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
35、the test (see Clause 9);f)any deviation, by agreement or otherwise, from the procedure specified;g)date of sampling, date of sample preparation and date of the test.Bibliography1EN 1430, Bitumen and bituminous binders - Determination of particle polarity of bituminous emulsionsBS 2000 SeriesEnergy I
36、nstituteBuying Parts of BS 2000Orders for BS 2000 publications should be addressed to either:Energy Institute Library and Information Service61 New Cavendish StreetLondonW1G 7ARTel:+44 (0)20 7467 7100Fax:+44 (0)20 7255 1472 www.energyinst.org.ukOrder standards securely via:www.energyinstpubs.org.uk
37、or:British Standards Institution Customer Services389 Chiswick High RoadLondonW4 4ALTel:+44 (0)20 8996 9001Fax:+44 (0)20 8996 7001 www.bsi-Order hard copy standards securely via:www.bsi-CopyrightCopyright 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/13。国内外标准大全豆丁网国内外标准下载地址
