BS EN 14629-2007 混凝土结构保护和修理用产品和系统.实验方法.硬化混凝土中氯化物含量测定.pdf
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1、BRITISH STANDARD BS EN 14629:2007 Products and systems for the protection and repair of concrete structures Test methods Determination of chloride content in hardened concrete The European Standard EN 14629:2007 has the status of a British Standard ICS 91.100.30 BS EN 14629:2007 This British Standar
2、d was published under the authority of the Standards Policy and Strategy Committee on 30 April 2007 BSI 2007 ISBN 978 0 580 50528 7 National foreword This British Standard was published by BSI. It is the UK implementation of EN 14629:2007. The UK participation in its preparation was entrusted by Tec
3、hnical Committee B/517, Concrete, to Subcommittee B/517/8, Protection and repair of concrete structures. A list of organizations represented on B/517/8 can be obtained on request to its secretary. This publication does not purport to include all the necessary provisions of a contract. Users are resp
4、onsible for its correct application. Compliance with a British Standard cannot confer immunity from legal obligations. Amendments issued since publication Amd. No. DateComments W - - - - - - - - -8- 7 - - 7 7- - - 7 - $ - $ - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - W
5、W D - - w - - - - EN 14629:2007 (E) 2 Contents Page Foreword3 Introduction.4 1 Scope 5 2 Normative references5 3 Materials and apparatus5 3.1 Chemicals.5 3.2 Apparatus .5 4 Test procedure.6 4.1 Sampling.6 4.2 Grinding7 4.3 Chemical analysis7 5 Test report 9 Bibliography10 EN 14629:2007 (E) 3 Forewor
6、d This document (EN 14629:2007) 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 be given the status of a national standard, either by publication of an identical text or by endorsement, at the
7、latest by September 2007, and conflicting national standards shall be withdrawn at the latest by September 2007. 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
8、or all such patent rights. It has been prepared by sub-committee 8 “Products and systems for the protection and repair of concrete structures“ (Secretariat AFNOR). This European Standard is one of a series dealing with products and systems for the protection and repair of concrete structures. It des
9、cribes a method for determining the chloride content of hardened concrete. 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, Es
10、tonia, 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. EN 14629:2007 (E) 4 Introduction Steel reinforcement in concrete may
11、 be at risk of corrosion if the concrete is contaminated by chlorides. ENV 1504-9 defines the principles for protection and repair of concrete structures which have suffered or may suffer damage or deterioration and gives guidance on the selection of products and systems which are appropriate for th
12、is intended use. EN 1504-10 requires that the concentration of chlorides be considered when decisions about the removal of concrete are made. To establish whether there is a risk of corrosion of the steel reinforcement due to a higher chloride content within the concrete than the critical threshold
13、value, the chloride content within the concrete cover and especially at the surface of the steel reinforcement should be determined. Assessment may be made in the field using a variety of rapid test methods, which are not included in this standard. For accurate determination of chloride content, con
14、crete samples need to be taken from the structure, prepared for chemical analysis and analysed. For chemical analysis of the concrete with respect to the chloride content either Volhards method or potentiometric titration are used as the reference methods. The chloride content may be expressed as a
15、percentage of chloride by mass of cement or of concrete. The chloride content by mass of cement may be derived using either an assumed value for the cement content of the concrete or a value which has been determined by chemical analysis or from construction records. EN 14629:2007 (E) 5 1 Scope This
16、 standard describes two methods for the determination of the total (free and bound) acid soluble chloride content of hardened concrete or mortar. This information is intended for use in estimating the risk of chloride induced corrosion of the steel reinforcement. It may be used on samples of powder
17、obtained either by drilling or from cores or fragments removed from concrete structures or on other appropriate laboratory specimens. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies
18、. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 384, Laboratory glassware - Principles of design and construction of volumetric glassware 3 Materials and apparatus 3.1 Chemicals Deionised water with an electrical conductivity less than
19、2 S/cm; Nitric acid (5 mol/l); Silver nitrate solution (0,02 mol/l); Ammonium thiocyanate (NH4SCN) solution (0,1 mol/l); Ammonium ferric sulfate indicator solution (100 ml of a cold saturated solution of NH4Fe(SO4)2 and 10 ml diluted nitric acid); 3,5,5-trimethylhexanol. NOTE For the potentiometric
20、method, additional reagents may be required as specified by the electrode manufacturer to ensure the proper functioning of the electrode. These will be specified in the manufacturers instructions for the electrode. 3.2 Apparatus Crushing and grinding equipment (as required to prepare samples); 1,18
21、mm sieve or smaller; ventilated oven, controlled to maintain a temperature of (105 5) C; balance capable of weighing up to 5 g to an accuracy of 1 mg; desiccator; burette, accurate to 0,05 ml; 250 ml glass beaker; magnetic stirrer; EN 14629:2007 (E) 6 heat source; vacuum filtering facility (Buchner
22、funnel, filtration flask, medium-textured filter paper); 250 ml volumetric flask; pipettes accurate to 0,1 ml; if required, potentiometric titration facility (eg. Ag/AgCl electrode or similar, high resistance mV-meter, burette accurate to 0,05 ml or automatic titration equipment). All volumetric gla
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- BS EN 14629-2007 混凝土结构保护和修理用产品和系统.实验方法.硬化混凝土中氯化物含量测定 14629 2007 混凝土结构 保护 修理 产品 系统 实验 方法 硬化 混凝土 氯化物 含量
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