BS EN 450-1995 Fly ash for concrete-Definitions, requirements and quality control1.pdf
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1、Licensed Copy: Tsinghua User ., Tsinghua University Library, 18 February 2005, Uncontrolled Copy, (c) BSI British Standard A single copy of this British Standard is licensed to Tsinghua User . 18 February 2005 This is an uncontrolled copy. Ensure use of the most current version of this document by s
2、earching British Standards Online at bsonline.techindex.co.uk BRITISH STANDARD BS EN 450:1995 Fly ash for concrete Definitions, requirements and quality control The European Standard EN 450:1994 has the status of a British Standard UDC 666.971.98:693.5:666.952.2:001.4:658.562 Licensed Copy: Tsinghua
3、 User ., Tsinghua University Library, 18 February 2005, Uncontrolled Copy, (c) BSI BS EN 450:1995 This British Standard, having been prepared under the direction of the Sector Board for Building and Civil Engineering, was published under the authority of the Standards Board and comes into effect on
4、15 December 1995 BSI 07-1999 The following BSI references relate to the work on this standard: Committee reference B/516/101 Draft for comment 91/11362 DC ISBN 0 580 24612 4 Committees responsible for this British Standard The preparation of this British Standard was entrusted by Technical Committee
5、 B/516, Cement and lime, to Subcommittee B/516/101, Pozzolanas, upon which the following bodies were represented: British Aggregate Construction Materials Industries British Cement Association British Precast Concrete Federation British Ready Mixed Concrete Association Cementitious Slag Makers Assoc
6、iation Department of the Environment (Building Research Establishment) Department of Transport Electricity Association Federation of Civil Engineering Contractors Quality Ash Association Amendments issued since publication Amd. No.DateComments Licensed Copy: Tsinghua User ., Tsinghua University Libr
7、ary, 18 February 2005, Uncontrolled Copy, (c) BSI BS EN 450:1995 BSI 07-1999i Contents Page Committees responsibleInside front cover National forewordii Foreword2 Text of EN 4503 National annex NA (informative) Comparison between BS 3892-1 and BS EN 4508 National annex NB (normative) Requirements pe
8、rmitted to be specified on a national basis9 List of referencesInside back cover Licensed Copy: Tsinghua User ., Tsinghua University Library, 18 February 2005, Uncontrolled Copy, (c) BSI w w w . b z f x w . c o m BS EN 450:1995 ii BSI 07-1999 National foreword This British Standard is the English la
9、nguage version of EN 450:1994 Fly ash for concrete Definitions, requirements and quality control prepared under the authority of the European Committee for Standardization (CEN). This standard has been prepared as part of a package of standards harmonized within the member countries of CEN to suppor
10、t the essential requirements of the Construction Products Directive. The term “fly ash” used in this standard covers pulverized-fuel ash (pfa) which is the more precise term for fly ashes produced from electricity generating power stations burning pulverized hard coals and which has been in common u
11、se in the UK for many years. BS EN 450 does not supersede BS 3892-1 which remains in force and covers a processed material, as explained in the introduction of this standard. BS 3892-2:1984 is under revision. This standard was drafted with the cooperation of the UK which proposed a requirement for d
12、ifferent classes of ash each with specific applications in order to maintain the successful system of classification and use established under BS 3892 since 1965. This was not required or accepted by the majority of CEN member countries. However, the introduction to EN 450 acknowledges that the UK a
13、nd Ireland require that ash, for use as a cementitious component in concrete, be processed in order to restrict variations in quality and to enhance performance in concrete. It further recognizes that the specific requirements for controlled properties which allow such processed ash to be used as a
14、special component of cementitious systems in concrete are not included in EN 450. Pfa conforming to BS 3892-1 is subject to such processing. BS 5328-1 and BS 8110-1 refer to the use of other fly ashes that do not conform to BS 3892-1 provided that satisfactory data on their use are available. Requir
15、ements in both BS EN 450 and BS 3892-1 are specified as characteristic values and conformity is assessed by means of a statistical procedure for continuous inspection operated by the ash producer (autocontrol). This includes the concept of “major defects” which are likely to reduce materially the us
16、ability of the ash for its intended purpose. In this respect both BS EN 450 and BS 3892-1 are based upon the text on conformity criteria given in the European Prestandard for cement, ENV 197-1:1992. Subsequent draft revisions of this text have removed reference to major defects, referring instead to
17、 “limit values” (upper and lower). The sum of the specified characteristic value and the corresponding major defect is the limit value for the particular property. The latter term is used throughout National annex NA in which the main differences between BS EN 450 and BS 3892-1 are summarized. BS EN
18、 450 makes reference in 3.2, 3.3 and 4.2.2 to certain items which are permitted to be fixed on a national basis. Normative National annex NB indicates how these clauses are to be interpreted for the UK. Most ash produced in the UK would conform to BS EN 450 without further processing. Rules to allow
19、 ash conforming to BS EN 450 to be used in concrete produced in accordance with EN 206 are, however, still under development. Until such rules have been developed and agreed, users of ash conforming to BS EN 450 are advised that, for the specific use as part of the cement content in concrete, pfa is
20、 required by BS 5328 and BS 8110 to conform to BS 3892-1. In particular, BS 5328 requires that, when pfa is combined with a Portland cement in the concrete mixer to give a combination equivalent to a cement conforming to BS 6588 or BS 6610, the pfa conforms to BS 3892-1. Licensed Copy: Tsinghua User
21、 ., Tsinghua University Library, 18 February 2005, Uncontrolled Copy, (c) BSI w w w . b z f x w . c o m BS EN 450:1995 BSI 07-1999iii A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. C
22、ompliance with a British Standard does not of itself confer immunity from legal obligations. Cross-references Publications referred toCorresponding British Standard EN 196-1:1994BS EN 196-1:1995 Methods of testing cement Part 1: Determination of strength EN 196-2:1994BS EN 196-2:1995 Methods of test
23、ing cement Part 2: Chemical analysis of cement EN 196-3:1994BS EN 196-3:1995 Methods of testing cement Part 3: Determination of setting time and soundness EN 196-6:1989BS EN 196-6:1992 Methods of testing cement Part 6: Determination of fineness EN 196-7:1989BS EN 196-7:1992 Methods of testing cement
24、 Part 7: Methods of taking and preparing samples of cement EN 196-21:1989BS EN 196-21:1990 Methods of testing cement Part 21: Determination of chloride, carbon dioxide and alkali content of cement ENV 197-1:1993DD ENV 197-1:1995 Cement Composition, specifications and conformity criteria Part 1: Comm
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