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1、BRITISH STANDARD BS 8500-1:2002 Incorporating Amendment No. 1 Concrete Complementary British Standard to BS EN 206-1 Part 1: Method of specifying and guidance for the specifier ICS 91.100.30 ? Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 06:06:52 GMT+00:00 20
2、06, Uncontrolled Copy, (c) BSI BS 8500-1:2002 This British Standard, having been prepared under the direction of the Building and Civil Engineering Sector Policy and Strategy Committee, was published under the authority of the Standards Policy and Strategy Committee on 27 February 2002 BSI 20 Octobe
3、r 2003 The following BSI references relate to work on this British Standard: Committee reference B/517/1 Draft for comment 03/302283 DC ISBN 0 580 38656 2 Committees responsible for this British Standard The preparation of this British Standard was entrusted by Technical Committee B/517, Concrete, t
4、o Subcommittee B/517/1, Concrete production and testing, upon which the following bodies were represented: Association of Lightweight Aggregate Manufacturers British Cement Association British Civil Engineering Test Equipment Manufacturers Association British Precast Concrete Federation Limited Ceme
5、nt Admixtures Association Cementitious Slag Makers Association Civil Engineering Contractors Association Construction Confederation Department of Trade and Industry Building Research Establishment Department of Transport, Local Government and the Regions Highways Agency Federation of Piling Speciali
6、sts Federation of Resin Formulators and Applicators Institute of Concrete Technology Institution of Structural Engineers National House-Building Council Quarry Products Association Society of Chemical Industry United Kingdom Quality Ash Association United Kingdom Steel Association Co-opted members A
7、mendments issued since publication Amd. No.DateComments 1463920 October 2003See national foreword Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 06:06:52 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 8500-1:2002 BSI 20 October 2003 i Contents Page Committees re
8、sponsibleInside front cover Forewordiii Introduction1 1Scope3 2Normative references3 3Terms and definitions, symbols and abbreviations3 4Method of specifying5 5Exchange of information11 Annex A (informative) Guidance for the specifier13 Annex B (normative) Identity testing for slump, flow and air co
9、ntent40 Annex C (informative) Expected cement content with nominal proportions42 Bibliography43 Table A.1 Exposure classes16 Table A.2 Classification of ground conditions18 Table A.3 Guidance on the selection of the structural performance level20 Table A.4 Selection of the DC-class and the number of
10、 APMs where the hydrostatic head of groundwater is not more than five times the section width21 Table A.5 Additional protective measures (APMs)22 Table A.6 Guidance on the selection of the appropriate designated concrete for situations where there is no risk of reinforcement corrosion due to exposur
11、e to a marine environment or an environment that includes direct contact to water containing de-icing agents24 Table A.7 Guidance on the selection of designated and standardized prescribed concrete in housing and other applications25 Table A.8 Strength class for designated concrete26 Table A.9 Stand
12、ardized prescribed concretes and indicative strengths26 Table A.10 Limiting values for composition and properties of concrete exposed to risk of corrosion of reinforcement induced by carbonation for an intended working life of at least 50 years27 Table A.11 Limiting values for composition and proper
13、ties of concrete exposed to risk of corrosion of reinforcement induced by carbonation for an intended working life of at least 100 years27 Table A.12 Limiting values for composition and properties of concrete exposed to risk of corrosion of reinforcement induced by chlorides other than from sea wate
14、r for an intended working life of at least 50 years29 Table A.13 Limiting values for composition and properties of concrete exposed to risk of corrosion of reinforcement induced by sea water for an intended working life of at least 50 years30 Table A.14 Limiting values for composition and properties
15、 of concrete to resist freezing and thawing (XF exposures)31 Table A.15 Limiting values of composition and properties for concrete where a DC-class is specified32 Table A.16 Limiting values of composition and properties for concrete in contact with sea water33 Licensed Copy: London South Bank Univer
16、sity, London South Bank University, Fri Dec 08 06:06:52 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 8500-1:2002 ii BSI 20 October 2003 Page Table A.17 Cements and combinations34 Table A.18 Minimum cement or combination content35 Table A.19 Consistence suitable for different uses of in-situ concret
17、e35 Table A.20 Compressive strength classes for use in specification36 Table B.1 Identity criteria for slump specified as a slump class40 Table B.2 Identity criteria for slump specified as a target value41 Table B.3 Identity criteria for flow specified as a flow class41 Table B.4 Identity criteria f
18、or flow specified as a flow value41 Table C.1 Target cement contents for nominal proportions42 Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 06:06:52 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 8500-1:2002 BSI 20 October 2003 iii Foreword This part of BS 850
19、0 has been prepared by Subcommittee B/517/1, under the direction of Technical Committee B/517. Together with BS EN 206-1 and BS 8500-2, it supersedes BS 5328 (all parts), which is to be withdrawn on 1 December 2003. BS 8500 contains additional United Kingdom provisions to be used in conjunction with
20、 BS EN 206-1. Together they form a complete package for the specification, production and conformity of fresh concrete. A Published Document containing a combined version of these standards with guidance on their use is under preparation and is intended for publication in 2003. BS 8500 is published
21、in the following parts: BS 8500-1, Method of specifying and guidance for the specifier; BS 8500-2, Specification for constituent materials and concrete. Further guidance on the application and use of this British Standard and BS EN 206-1 is given in Specifying concrete to BS EN 206-1/BS 8500 1. The
22、terms “fly ash” and “pulverized-fuel ash (pfa)” are generally synonymous. In BS 8500 they are used according to the terminology in the relevant material standard. BS 5328 placed restrictions on the use of Portland-limestone cement due to the lack of information on performance in certain environments
23、. Since then further data are available. Within the context of the recommendations and requirements given in both parts of BS 8500, the performance of concrete made with Portland-limestone cement types CEM II/A-L or LL and combination types CIIA-L or LL is equivalent to some of the other permitted c
24、ement and combination types. Restrictions on the use of cement and combination types IIA-L or LL remain for aggressive chemical environments. This part of BS 8500 was drafted on the assumption that the execution of its provisions is entrusted to appropriately qualified and competent people. Amendmen
25、t No. 1 takes account of a published amendment to BRE Special Digest 1 and a forthcoming amendment to BS EN 206-11). Some of the durability provisions have been extended to include lower covers to reinforcement. The new provisions for aggregates reflect the BSI advice on the application of the Europ
26、ean aggregate standards in the UK. Amendment No. 1:2003 also includes some clarification of the requirements and a few corrections. The start and finish of text introduced or altered by Amendment No. 1:2003 is indicated in the text by tags !“. Minor editorial changes are not tagged. 1)Amendment A1 t
27、o EN 206-1:2000 passed its formal vote in September 2003 and is in production at the time of publication of this amendment to BS 8500. Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 06:06:52 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 8500-1:2002 iv BSI 20 Oc
28、tober 2003 Warning. Where skin is in contact with fresh concrete, skin irritations are likely to occur owing to the alkaline nature of cement. The abrasive effects of sand and aggregate in the concrete can aggravate the condition. Potential effects range from dry skin, irritant contact dermatitis, t
29、o in cases of prolonged exposure severe burns. Take precautions to avoid dry cement entering the eyes, mouth and nose when mixing mortar or concrete by wearing suitable protective clothing. Take care to prevent fresh concrete from entering boots and use working methods that do not require personnel
30、to kneel in fresh concrete. Unlike heat burns, cement burns may not be felt until some time after contact with fresh concrete, so there might be no warning of damage occurring. If cement or concrete enters the eye, immediately wash it out thoroughly with clean water and seek medical treatment withou
31、t delay. Wash wet concrete off the skin immediately. Barrier creams may be used to supplement protective clothing but are not an alternative means of protection. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application
32、. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i to iv, pages 1 to 44, inside back cover and a back cover. The BSI copyright notice displayed in this document indicat
33、es when the document was last issued. Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 06:06:52 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 8500-1:2002 BSI 20 October 2003 1 Introduction The specifier is offered five approaches to the specification of concrete.
34、 a) Designated concretes. Where concrete is intended for the uses given in Table A.6 or Table A.7, the appropriate designated concrete is identified. The adequacy of the associated strength class is checked using Table A.8 and then the specification is drafted in accordance with 4.2. Guidance on the
35、 selection of designated concrete is given in A.4. The alpha-numeric references used to identify designated concretes are only applicable where third-party certification is selected as the option in specifying the concrete. Where the option selected is not to use a certified concrete, the method of
36、designation/specification given in b), c) or d) below is used. It is stressed that the reference to third-party certification does not make such a method of specification obligatory: it has been included with the support of industry bodies wishing to maintain the progress which has been achieved in
37、quality levels as a result of such certification. b) Designed concretes. This approach offers more flexibility to the specifier than designated concretes, which do not cover every application and every constituent material. The environments to which the concrete is to be exposed are identified from
38、A.2. Using the intended working life and the minimum cover to reinforcement, the limiting values of composition are determined for each of the identified exposure classes using the guidance in A.5. The requirements for the concrete are selected from this composite of limiting values plus structural
39、and fire considerations, and the specification is then drafted in accordance with 4.3. c) Prescribed concretes. This approach allows the specifier to prescribe the exact composition and constituents of the concrete. It is not permitted to include requirements on concrete strength, and so this option
40、 has only limited applicability. The specification is drafted in accordance with 4.4. d) Standardized prescribed concretes. These were previously known as standard mixes in BS 5328. This approach is appropriate where concrete is site-batched on a small site or obtained from a ready-mixed concrete pr
41、oducer who does not have accredited third-party certification. The appropriate standardized prescribed concrete is identified from Table A.7 and the specification drafted in accordance with 4.5. Indicative strengths for standardized prescribed concretes are given in Table A.9. Standardized prescribe
42、d concrete may be used as an alternative to the GEN series of designated concretes. e) Proprietary concretes. This approach is appropriate where it is required that the concrete achieves a performance, using defined test methods, outside the normal performance requirements for concrete, e.g. where s
43、elf-compaction is required. The proprietary concrete is selected in consultation with the concrete producer and the project specification is then drafted in accordance with 4.6. NOTE 1This method of specification is not suitable for initial use in public procurement contracts as the specification, i
44、n effect, determines the concrete producer. BSI has not substantiated any claimed performance made for proprietary concrete by any producer. Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 06:06:52 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 8500-1:2002 2 BSI
45、20 October 2003 Within each approach to drafting the specification, there are a number of instances in which the specifier selects from the various options given in this part of BS 8500. In the context of BS EN 206-1, the specifier is the person or body responsible for the final compilation of techn
46、ical requirements, called the “specification”, which is passed to the concrete producer. This approach differs from BS 5328 where there may be several specifiers all contributing to the specification. In practice, the specification continues to be a compilation of technical requirements drafted by a
47、 number of persons or bodies. However, the name “specifier” is reserved for the person or body in the chain who passes the specification to the producer (see BS EN 206-1:2000, 3.1.36 and 3.1.37). In the case of ready-mixed concrete, the purchaser is the specifier. NOTE 2There can be occasions where
48、it is advantageous for economic or technical reasons for the producer or user to propose changes to the specification. In such cases the proposer of the amendment obtains approval from the specifier who may, in turn, seek the approval of the body responsible for the specific technical requirement, e
49、.g. the designer. Where designed concretes are specified in accordance with this part of BS 8500, the guidance on specification is given for defined materials with an established or accepted adequate performance in United Kingdom conditions. Some European Standards, e.g. BS EN 197-1, encompass a wide range of products, including several for which there is no experience of use in the United Kingdom. Until experience is gained, their use should be b
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