1、 g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58aggressive carbon dioxide content in waterThe European Standard EN 13577:2007 has the status of a B
2、ritish StandardICS 13.060.50; 91.100.30Chemical attack on concrete Determination of BRITISH STANDARDBS EN 13577:2007BS EN 13577:2007This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 July 2007 BSI 2007ISBN 978 0 580 57341 5Amendments issued s
3、ince publicationAmd. No. Date Commentscontract. Users are responsible for its correct application.Compliance with a British Standard cannot confer immunity from legal obligations.National forewordThis British Standard was published by BSI. It is the UK implementation of EN 13577:2007.The UK particip
4、ation in its preparation was entrusted by Technical Committee B/517, Concrete, to Subcommittee B/517/1, Concrete production and testing.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 pro
5、visions of a EUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN 13577April 2007ICS 13.060.50; 91.100.30English VersionChemical attack on concrete - Determination of aggressivecarbon dioxide content in waterAttaque chimique du bton - Dtermination de la teneur endioxyde de carbone agressif de leauChemi
6、scher Angriff an Beton - Bestimmung des Gehalts anangreifendem Kohlendioxid in WasserThis European Standard was approved by CEN on 8 March 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 na
7、tional standard without 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
8、any other language made 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, Est
9、onia, 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 STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISC
10、HES KOMITEE FR NORMUNGManagement 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 13577:2007: EEN 13577:2007 (E) 2 Contents Page Foreword3 1 Scope 4 2 Normative references 4 3 Terms and
11、 definitions .4 4 Principle4 5 Apparatus .4 6 Procedure .5 7 Expression of results 6 8 Test report 6 9 Precision.6 Annex A (informative) Example of a test report - Determination of aggressive CO2content .7 Bibliography 8 EN 13577:2007 (E) 3 Foreword This document (EN 13577:2007) has been prepared by
12、 Technical Committee CEN/TC 104 “Concrete and related products”, the secretariat of which is held by DIN. 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 October 2007, and conflicting national sta
13、ndards shall be withdrawn at the latest by October 2007. This European Standard describes a method for testing water which may be aggressive to hardened concrete. It is based on DIN 4030 “Assessment of water, soil and gases for their aggressiveness to concrete“. No existing European Standard is supe
14、rseded. 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,
15、 Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EN 13577:2007 (E) 4 1 Scope This European Standard specifies a reference method for the determination of carbon dioxide present in water an
16、d which has a capacity to dissolve in lime from concrete. It is not applicable to the measurement of total carbon dioxide present in water. If other methods are used, it needs to be shown, that they give results equivalent to those obtained by this reference method. This test does not apply to water
17、 that has a pH less than 4,3. In case of dispute, only the reference method is used. 2 Normative references Not applicable. 3 Terms and definitions For the purposes of this document, the following term and definition applies. 3.1 aggressive CO2quantity of carbon dioxide present in water which has a
18、capacity to dissolve lime in concrete 4 Principle Calcium carbonate powder is added to water. After the reaction of aggressive CO2with calcium carbonate is complete, the water is titrated with acid. The difference in titration with a second sample of the same water which has not been subjected to th
19、e reaction with calcium carbonate will give the aggressive CO2content of the water. 5 Apparatus 5.1 Laboratory equipment 5.1.1 balance reading up to 100 g accurate to 0,1 mg. 5.1.2 pH meter (in calibration) or a pH indicator (e.g. metylorange). 5.1.3 magnetic stirrer fitted with thermosstatic contro
20、l. 5.1.4 thermometer with a measuring range from 0 to 30 C and scale divisions of 0,2 C. 5.1.5 25 ml burette accurate to 0,03 ml. 5.1.6 100 ml pipette accurate to 0,1 ml. EN 13577:2007 (E) 5 5.1.7 sample bottle of at least 1 litre. 5.1.8 bottle of 0,5 litre capacitiy with screw closure. 5.1.9 250 ml
21、 beaker. 5.1.10 thermally insulated transport boxes (when required). 5.2 Reagents 5.2.1 Precipitated calcium carbonate powder. 5.2.2 Hydrochloric acid (0,100 M). WARNING Hydrochloric acid is corrosive. Take precautions to avoid contact with the eyes or inhalation of vapour. Prevent skin contact by w
22、earing gloves and suitable protective clothing. If acid enters the eye or touches the skin, wash it out thoroughly with clean water and seek medical treatment without delay. 6 Procedure 6.1 Preparations Prior to sampling water 10 g of calcium carbonate powder shall be weighed and put into the 0,5 l
23、bottle (5.1.8). 6.2 Sampling Caution. Carbon dioxide is easily lost from water during sampling, transit and storage of samples. Consequently, the water sample shall be taken with care not to remove the dissolved gas and shall be tested as soon as possible after collection. Fill the sample bottle (5.
24、1.7) with water to be tested. Then use this sample bottle (5.1.7) to fill slowly the 0,5 l bottle (5.1.8) containing the 10 g of calcium carbonate powder which shall be filled slowly, care being taken not to flush out the powder while filling. The bottle shall be completely filled, hermetically seal
25、ed after collecting the sample and distinctively and permanently marked by the sampler with the sample number, point of collection, sampling date and sampling time. The remaining water shall be kept in the sampler bottle for the second measurement. The composition of water sample shall not alter whi
26、le it is being transported, e.g. due to change in temperature. The change in temperature during transportation from the point of collection and testing in the laboratory shall not exceed 5 C . The time between collection and determination of the aggressive CO2content, shall not exceed 48 h. When app
27、ropriate, thermally insulated transport boxes shall be used. 6.3 Testing After sampling and just prior to testing, the temperature of the water shall be measured to the nearest 0,2 C and reported in the sampling record. The 0,5 l bottle (containing the 10 g of CaCO3powder) shall be vigorously shaken
28、 for not less than 2 h. Care shall be taken to ensure that the temperature of water does not vary by more than 2 C from the temperature measured during collection from the temperature measured after sampling. If necessary the magnetic thermo stated device shall be used. The use of an automatic titra
29、ter is a permitted alternative procedure. 100 ml of the sample water shall be titrated with hydrochloric acid to a pH value of 4,3. EN 13577:2007 (E) 6 H1is the volume in ml of acid necessary for this titration. After the excess calcium carbonate has settled, 100 ml of the clear supernatant solution
30、 shall be titrated with the hydrochloric acid to a pH value of 4,3. H2is the volume in ml of acid necessary for this titration. Repeat the measurement with a second sample of the clear supernatant solution taken from the remaining solution in the sample bottle (5.1.7). 7 Expression of results 7.1 Ca
31、lculation The lime dissolving capacity (LDC) of the sample is calculated from the equation: LDC = 28 (H2- H1) expressed in mg of CaO/l The aggressive CO2content of the sample is given by multiplying LDC by the ratio 44/56. 7.2 Result The mean value of each determination from the two samples shall be
32、 taken as the aggressive CO2content of the water. It shall be expressed in mg/l rounded to the nearest whole number. 8 Test report The report shall include: a) unambiguous identification of the test sample; b) location of performance of test; c) date and time of collection; d) time of performance of
33、 test; e) temperatures of sample (after sampling and just prior to testing); f) calculated aggressive CO2contents and mean value; g) identification of person carrying out the test; h) deviations from the standard test method (if any); i) declaration by the person carrying out the test that it was ca
34、rried out in accordance with the standard except as noted in h). A pro-forma for a test report is given in Annex A. 9 Precision The standard deviation for repeatability is 0,3 mg/l. EN 13577:2007 (E) 7 Annex A (informative) Example of a test report - Determination of aggressive CO2content Client Tes
35、t organisation Test location Test item Sample identification: Date and time of collection: Type of water: Temperature of water after sampling: (ground water, surface water etc.) Temperature of water just prior to testing: Point of collection: (borehole, pit etc.) Depth of collection: Test and test r
36、esults Time of performance of test: pH meter reference number: Any deviation from standard test method: Aggressive CO2content: Test 1: mg/l Test 2: mg/l Result: mg/l Except as detailed above this test was carried out in accordance with EN 13577 Technical responsibility Responsible person: Name: Posi
37、tion: Signature: Certificate identification: Certificate No: Date issued: EN 13577:2007 (E) 8 Bibliography 1 EN 206-1, Concrete Part 1: Specification, performance, production and conformity 2 ISO 5725-2, Accuracy (trueness and precision) of measurement methods and results Part 2: Basic method for th
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