1、BS EN480-10:2009ICS 91.100.30NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBRITISH STANDARDAdmixtures forconcrete, mortar andgrout Test methodsPart 10: Determination of watersoluble chloride contentThis British Standard was published under the authority of the Standards Polic
2、y and Strategy Committee on 31 January 2010 BSI 2010ISBN 978 0 580 65577 7Amendments/corrigenda issued since publicationDate CommentsBS EN 480-10:2009National forewordThis British Standard is the UK implementation of EN 480-10:2009. Itsupersedes BS EN 480-10:1997 which is withdrawn.The UK participat
3、ion in its preparation was entrusted to TechnicalCommittee B/517/3, Admixtures.A list of organizations represented on this committee can be obtained onrequest to its secretary.This publication does not purport to include all the necessary provisionsof a contract. Users are responsible for its correc
4、t application. Compliance with a British Standard cannot confer immunityfrom legal obligations.BS EN 480-10:2009EUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN 480-10July 2009ICS 91.100.30 Supersedes EN 480-10:1996 English VersionAdmixtures for concrete, mortar and grout - Test methods - Part10: D
5、etermination of water soluble chloride contentAdjuvants pour bton, mortier et coulis - Mthodes dessai -Partie 10: Dtermination de la teneur en chlorure solubledans leauZusatzmittel fr Beton, Mrtel und Einpressmrtel -Prfverfahren - Teil 10: Bestimmung des wasserlslichenChloridgehaltesThis European St
6、andard was approved by CEN on 23 June 2009.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-date lists and bibliographical references concerning su
7、ch 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 the responsibility of a CEN member into its own language
8、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, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembour
9、g, 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: Avenue Marnix 17, B-1000 Brussels 2009 CEN All rights of exp
10、loitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 480-10:2009: EBS EN 480-10:2009EN 480-10:2009 (E) 2 Contents Page Foreword 31 Scope 52 Principle 53 Apparatus .53.1 pH meter .53.2 Electrodes .53.3 Additional apparatus .63.4 Reagents .64 Procedure .64.1 Pr
11、eparation of sample .64.2 Determination .65 Results 76 Test report 8BS EN 480-10:2009EN 480-10:2009 (E) 3 Foreword This document (EN 480-10:2009) has been prepared by Technical Committee CEN/TC 104 “Concrete and related products”, the secretariat of which is held by DIN. This European Standard shall
12、 be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by January 2010, and conflicting national standards shall be withdrawn at the latest by January 2010. Attention is drawn to the possibility that some of the elements of this docum
13、ent 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 480-10:1996. It has been drafted by Subcommittee 3 (SC 3) of TC 104 “Admixtures for concrete, mortar and grout“. This draft European St
14、andard is part of the series EN 480 “Admixtures for concrete, mortar and grout Test methods“ which comprises the following: Part 1 Reference concrete and reference mortar for testing Part 2 Determination of setting time Part 4 Determination of bleeding of concrete Part 5 Determination of capillary a
15、bsorption Part 6 Infrared analysis Part 8 Determination of the conventional dry material content Part 10 Determination of water soluble chloride content Part 11 Determination of air void characteristics in hardened concrete Part 12 Determination of the alkali content of admixtures Part 13 Reference
16、masonry mortar for testing mortar admixtures Part 14 Determination of the effect on corrosion susceptibility of reinforcing steel by potentiostatic electro-chemical test. This standard is applicable together with the other standards of the EN 480 series for testing admixtures in accordance with the
17、EN 934 series of standards. The following amendments have been made to the 1996-09 edition of this standard: editorial revision; detailing of used reagents; detailing of the procedure applied for Method 1 to Method 3. BS EN 480-10:2009EN 480-10:2009 (E) 4 According to the CEN/CENELEC Internal Regula
18、tions, 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, Italy, Latvia, Lithuania, Luxembourg, Malta, Nether
19、lands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. BS EN 480-10:2009EN 480-10:2009 (E) 5 1 Scope This draft European Standard specifies methods for determining water soluble halogens (except fluorides) in admixtures. The total water solub
20、le halogen content is expressed as the chloride content. 2 Principle The object of the test is to determine the content of chloride ions (including other halogen ions except fluorides) in an admixture by precipitation of the chloride ions with a silver nitrate solution, according to the reaction: Ag
21、ClAgCl +(solid) The end point of this reaction is determined with the aid of a pH meter. The volume of the sample required for this test has been calculated for an admixture of which the chloride content is lower than 0,1 % by mass. If the chloride content is known, or can be assumed to be higher, t
22、he admixture has to be diluted in a precise ratio before carrying out the test. 3 Apparatus 3.1 pH meter Either: a) a pH millivoltmeter in which case the graph is plotted point by point, or b) a recording pH millivoltmeter connected to an automatic burette. 3.2 Electrodes Either: a) a combination of
23、 two electrodes consisting of: 1) an indicator: silver; 2) a reference: mercuric sulphate (electrolyte KNO3) or calomel with agar gel (electrolyte KNO3); or b) a combined electrode (indicator and reference) Ag - AgCl (electrolyte KNO3). NOTE Other electrodes such as ion selective electrodes may be u
24、sed provided the results will be unaffected. BS EN 480-10:2009EN 480-10:2009 (E) 6 3.3 Additional apparatus 3.3.1 Balance with an accuracy of 0,1 mg reading up to 200 g 3.3.2 20 ml burette graduated with accuracy of 0,05 ml 3.3.3 250 ml and 500 ml beakers 3.3.4 1 000 ml measuring flask 3.3.5 Heating
25、 device with a magnetic stirrer 3.3.6 10 ml, 20 ml and 50 ml graduated flasks 3.4 Reagents All reagents shall be of analytical grade. 3.4.1 Concentrated nitric acid (HNO3) 3.4.2 Hydrogen peroxide (H2O2), 30 % by mass (110 volumes) 3.4.3 Sodium hydroxide solution (naOH), 33 % by mass 3.4.4 Distilled
26、or demineralized water 3.4.5 Ethanol (C2H5OH) 3.4.6 Acetone (C3H7O) 3.4.7 Silver nitrate solution (AgNO3), pre-prepared 0,01 mol/l, normality N determined to 0,0001 4 Procedure 4.1 Preparation of sample 4.1.1 Liquid admixture From a liquid admixture a sample of (10 1) g is weighed to 0,01 g and plac
27、ed into a 250 ml or a 500 ml beaker. 4.1.2 Powder admixture From a powder admixture a sample (5 1) g is weighed to 0,01 g. The sample is placed into a 250 ml or a 500 ml beaker. 4.2 Determination 4.2.1 General Depending upon the composition of the admixture one of the following methods shall be used
28、. BS EN 480-10:2009EN 480-10:2009 (E) 7 4.2.2 Method 1 If the admixture does not contain constituents that will interfere with the test, such as lignosulphonates, thiocyanates or reducing agents, dilute the sample or dissolve it and make the solution up to 100 ml with distilled or demineralized wate
29、r. Then add 80 ml of acetone followed by dilute nitric acid until the pH is (2,0 + 0,5) and carry out the titration of the chloride ions with the silver nitrate solution, recording the volume (V) used to 0,05 ml. Carry out a blank titration under the same conditions and record the volume (Vo) to 0,0
30、5 ml. 4.2.3 Method 2 If the admixture does contain, or can be assumed to contain lignosulphonate or reducing agents, the sample shall be diluted or dissolved and made up to 100 ml with distilled or demineralized water. Then add 5 ml of sodium hydroxide solution followed by 10 ml of hydrogen peroxide
31、. This can cause an exothermic reaction. In order to avoid loss of chloride ions, make sure that the pH remains above 8,5 by adding, if necessary, more sodium hydroxide solution. Bring the solution very slowly to the boiling point by means of a heating device with a magnetic stirrer and boil for 30
32、minutes1). Leave the solution to cool to (20 + 2) oC. Then add 80 ml of acetone followed by dilute nitric acid until the pH is (2,0 + 0,5) and carry out the titration of the chloride ions using the silver nitrate solution, recording the volume used (V) to 0,05 ml. Carry out a blank titration under t
33、he same conditions and record the volume (Vo) to 0,05 ml. 4.2.4 Method 3 NOTE Carry out this test in an extraction cabinet to minimise the risk from the exothermic reaction and the escape of hydrogen cyanide. The operator should wear suitable protective clothing. If the admixture does contain, or ca
34、n be assumed to contain thiocyanate, dissolve the sample if necessary and dilute to 100ml using distilled or demineralised water then place the sample in a 500 ml beaker in order to avoid losses by overflow. Carefully add 5 ml of sodium hydroxide solution followed by 10 ml of hydrogen peroxide. This
35、 can cause an extremely exothermic reaction. After this reaction has subsided, add again 10 ml of hydrogen peroxide and repeat the addition three times. In order to avoid loss of chloride ions and minimise the escape of hydrogen cyanide, make sure that the pH remains above 8,5 at all times by adding
36、, if necessary, more sodium hydroxide solution. Heat the solution slowly to the boiling point and keep it boiling for 2 h. Leave the solution to cool slowly to (20 + 2) o C. Then transfer the solution into a 250 ml beaker using distilled or demineralized water to wash out the 500 ml beaker. Add 80 m
37、l of acetone followed by dilute nitric acid until the pH is (2,0 + 0,5) and carry out the titration of the chloride ions using the silver nitrate solution, recording the volume used (V) to 0,05 ml. Carry out a blank titration under the same conditions and record the volume (Vo) to 0,05 ml 5 Results
38、The results shall be expressed in % by mass. 1) Some admixtures may foam while boiling. This may be reduced by the addition of ethanol. BS EN 480-10:2009EN 480-10:2009 (E) 8 Chloride content wcl=()%55,3mnVVoby mass where V is the volume of silver nitrate solution used in the test in millilitres; Voi
39、s the volume of silver nitrate solution used in the blank titration in millilitres; N is the normality of silver nitrate solution in mol per litre; m is the mass of the sample in grams. 6 Test report The test report shall include at least the following information: a) Name or code of admixture teste
40、d (with information relating to its marking); b) Date of test; c) Name of the laboratory; d) Name of operator; e) Number of test standard (EN 480-10) f) Details of the equipment used; g) Method of test used (i.e. method 1, 2 or 3).; if method 2 or 3 has been used, the volume of hydrogen peroxide, th
41、e boiling time and any other necessary comments shall be included; h) Origin of the sample and date when taken; i) Chloride ion content that shall be reported to the nearest 0,01 %. NOTE All three methods give the total halogen ion content (except fluoride) as chloride. In the case of method 2, any
42、thiocyanate will also be included as chloride. BS EN 480-10:2009This page has been intentionally left blankBS EN480-10:2009BSI GroupHeadquarters 389Chiswick High Road,London, W4 4AL, UKTel +44 (0)20 8996 9001Fax +44 (0)20 8996 - British Standards InstitutionBSI is the independent national body resp
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