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1、a Date: 6 November 2007 Origin: National Latest date for receipt of comments: 21 January 2008 Project no.: 2007/02734 Responsible committee: B/524 Precast concrete products Interested committees: Title: BS 1217:2008 Cast stone Specification Supersession information: If this document is published as
2、a standard, the UK implementation of it will supersede BS1217 : 1997. If you are aware of a current national standard which may be affected, please notify the secretary (contact details below). WARNING: THIS IS A DRAFT AND MUST NOT BE REGARDED OR USED AS A BRITISH STANDARD. THIS DRAFT IS NOT CURRENT
3、 BEYOND 29 January 2008. This draft is issued to allow comments from interested parties; all comments will be given consideration prior to publication. No acknowledgement will normally be sent. See overleaf for information on commenting. No copying is allowed, in any form, without prior written perm
4、ission from BSI except as permitted under the Copyright, Designs and Patent Act 1988 or for circulation within a nominating organization for briefing purposes. Electronic circulation is limited to dissemination by e-mail within such an organization by committee members. Further copies of this draft
5、may be purchased from BSI Customer Services, Tel: +44(0) 20 8996 9001 or email ordersbsi-. British, International and foreign standards are also available from BSI Customer Services. Information on the co-operating organizations represented on the committees referenced above may be obtained from the
6、 responsible committee secretary. Cross-references The British Standards which implement International or European publications referred to in this draft may be found via the British Standards Online Service on the BSI web site http:/www.bsi-. Direct tel: 020 8996 7603 Responsible Committee Secretar
7、y: Miss A Attra (BSI) E-mail: anita.attrabsi- Draft for Public Comment Head Office 389 Chiswick High Road London W4 4AL Telephone: +44(0)20 8996 9000 Fax: +44(0)20 8996 7001 Form 36 Version 7.0 DPC: 07/30172627 DC Licensed Copy: London South Bank University, London South Bank University, Fri Nov 16
8、07:55:28 GMT+00:00 2007, Uncontrolled Copy, (c) BSI b Introduction Your comments on this draft are welcome and will assist in the preparation of the consequent British Standard. If no comments are received to the contrary, this draft may be implemented unchanged as a British Standard. Submission The
9、 guidance given below is intended to ensure that all comments receive efficient and appropriate attention by the responsible BSI committee. Annotated drafts are not acceptable and will be rejected. All comments must be submitted, preferably electronically, to the Responsible Committee Secretary at t
10、he address given on the front cover. Comments should be compatible with Version 6.0 or Version 97 of Microsoft Word for Windows, if possible; otherwise comments in ASCII text format are acceptable. Any comments not submitted electronically should still adhere to these format requirements. All commen
11、ts submitted should be presented as given in the example below. Further information on submitting comments and how to obtain a blank electronic version of a comment form are available from the BSI web site at: http:/www.bsi- Date: xx/xx/200x Document: ISO/DIS xxxxx 1 2 (3) 4 5 (6) (7) MB Clause No./
12、 Subclause No./ Annex (e.g. 3.1) Paragraph/ Figure/Table/ Note (e.g. Table 1) Type of com- ment Comment (justification for change) by the MB Proposed change by the MB Secretariat observations on each comment submitted 3.1 Definition 1 ed Definition is ambiguous and needs clarifying. Amend to read .
13、so that the mains connector to which no connection . 6.4 Paragraph 2 te The use of the UV photometer as an alternative cannot be supported as serious problems have been encountered in its use in the UK. Delete reference to UV photometer. Microsoft and MS-DOS are registered trademarks, and Windows is
14、 a trademark of Microsoft Corporation. Licensed Copy: London South Bank University, London South Bank University, Fri Nov 16 07:55:28 GMT+00:00 2007, Uncontrolled Copy, (c) BSI BS 1217:2008 BRITISH STANDARD Cast stone Specification ICS x.xxx.xx NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED B
15、Y COPYRIGHT LAW Licensed Copy: London South Bank University, London South Bank University, Fri Nov 16 07:55:28 GMT+00:00 2007, Uncontrolled Copy, (c) BSI BS 1217:2008 Publishing and copyright information The BSI copyright notice displayed in this document indicates when the document was last issued.
16、 BSI 2008 ISBN 978 0 580 XXXXX X The following BSI references relate to the work on this standard: Committee reference B/524 Draft for comment XX/XXXXXXXX DC Publication history (Publishing history if applicable) Amendments issued since publication Amd. No. Date Text affected Licensed Copy: London S
17、outh Bank University, London South Bank University, Fri Nov 16 07:55:28 GMT+00:00 2007, Uncontrolled Copy, (c) BSI Contents Foreword 4 1 Scope 6 2 Normative references 6 3 Terms and definitions 6 4 Two-part mix units 6 5 Reinforcement 7 6 Compressive strength 7 7 Surface finish 7 8 Tolerances 7 9 We
18、athering 8 10 Marking 8 Annexes Annex A (normative) CAT weathering 8 Annex B (informative) General notes for guidance 8 Annex C (informative) Guidance on slenderness ratios (SR) 10 List of figures Figure C.1 Typical sections of cast stone product illustrating the inscribed or superscribed circle for
19、 estimating the slenderness ratio 11 List of tables Table 1 Tolerances 7 Table B.1 Selection guidance to specifier with reference to the manufacturing method of cast stone units 9 Summary of pages This document comprises a front cover, an inside front cover, pages i to xx, pages 1 to xx , an inside
20、back cover and a back cover. Licensed Copy: London South Bank University, London South Bank University, Fri Nov 16 07:55:28 GMT+00:00 2007, Uncontrolled Copy, (c) BSI Foreword Publishing information This British Standard is published by BSI and came into effect on XX Month 200X. It was prepared by T
21、echnical Committee B/524, Precast concrete products. A list of organizations represented on this committee can be obtained on request to its secretary. Supersession This British Standard supersedes BS 1217:1997, which is withdrawn. Information about this document This new edition of BS 1217 incorpor
22、ates changes made necessary by the publication of BS EN 771-5 and BS EN 845-2. It does not represent a full review or revision of the standard, which will be undertaken in due course. This new edition also takes into account BS 5642-1 and BS 5642-2 which contain requirements for cast stone products.
23、 Several innovations have been introduced, the primary one being the division of material and product requirements. An equally important matter is the introduction of a choice in weathering test requirements by the inclusion of the capillary absorption test (CAT) as an alternative to the existing in
24、itial surface absorption test (ISAT), each test having a single specification limit. The reasoning behind this is described in Annex B (informative) which refers to the individual clauses. The following other principal changes have also been made. a) Slenderness ratio, being a design consideration,
25、has been moved to Annex C (informative) with accompanying figure. b) Due to there being insufficient data relating the rebound hardness number to product strength, the rebound hardness test has been withdrawn and guidance is given in Annex B. Since cutting or drilling of samples from products is ban
26、ned, this has resulted in there being no test specification for product strength, only cube strength. The Technical Committee hopes that future research, such as the DOE/PIT Dundee University project, will yield useful information enabling the Technical Committee to make up for this shortfall in a f
27、uture revision. c) Drying shrinkage requirements have also been deleted and guidance may be obtained from BS 5628-3 concerning control joints. d) Reference is made in Table B.1 to the two common methods of cast stone manufacture, namely the semi-dry mix design (also known as earth-moist) virtually i
28、nstantly demoulded and the wet-cast mix design generally left in the mould overnight. No reference to these methods is made elsewhere in the standard. e) The Technical Committee is aware of the confusion in definitions and the overlap in BS 5642, BS 6457 and BS 6100-5.2 with this standard and action
29、 is being taken to clarify the situation. Presentational conventions The provisions of this standard are presented in roman (i.e. upright) type. Its requirements are expressed in sentences in which the principal auxiliary verb is “shall”. Commentary, explanation and general informative material is p
30、resented in smaller italic type, and does not constitute a normative element. Requirements in this standard are drafted in accordance with The BSI guide to standardization Section 2: Rules for the structure, drafting and presentation of British Standards, subclause 11.3.1, which states, “Requirement
31、s should be expressed using wording such as: When tested as described in Annex A, the product shall .”. This means that only those products that are capable of passing the specified test will be deemed to conform to this standard. Licensed Copy: London South Bank University, London South Bank Univer
32、sity, Fri Nov 16 07:55:28 GMT+00:00 2007, Uncontrolled Copy, (c) BSI Contractual and legal considerations This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard cannot confer immun
33、ity from legal obligations. Licensed Copy: London South Bank University, London South Bank University, Fri Nov 16 07:55:28 GMT+00:00 2007, Uncontrolled Copy, (c) BSI 1 Scope This British Standard specifies performance requirements for cast stone products other than for those products conforming to B
34、S 5642-1, Sills, BS 5642-2, Copings, BS EN 771-5, Manufactured stone masonry units and BS EN 845-2, Lintels, which contain product specific requirements. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the e
35、dition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. BS 1881-208, Testing concrete Part 208: Recommendations for the determination of the initial surface absorption of concrete BS 5642-1, Sills and copings Part 1: Specificati
36、on for window sills of precast concrete, cast stone, clayware, slate and natural stone BS 5642-2, Sills and copings Part 2: Specification for copings of precast concrete, cast stone, clayware, slate and natural stone BS EN 771-5, Specification for masonry units Part 5: Manufactured stone masonry uni
37、ts BS EN 845-2, Specification for ancillary components for masonry Part 2: Lintels BS EN 12390-2, Testing hardened concrete Part 2: Making and curing specimens for strength tests BS EN 12390-3, Testing hardened concrete Part 3: Compressive strength of test specimens 3 Terms and definitions For the p
38、urposes of this British Standard, the following terms and definitions apply. 3.1 cast stone any material manufactured with aggregate and cementitious binder, intended to resemble in appearance, and which may be used in a similar way to, natural stone NOTE Cast stone units are either homogeneous thro
39、ughout or consist of facing and backing materials. 3.2 visual face any face or part of a cast stone unit visible after completion of works. 3.3 exposed face any face which is not bedded or otherwise protected in the works (e.g. with mortar or bitumen) NOTE Unbedded parts of a sill face or faces expo
40、sed to a cavity are examples of exposed faces. Visual faces are exposed faces but not necessarily vice versa. 4 Two-part mix units When cast stone units are made from separate facing and backing mixes: a) visual faces shall have a minimum facing mix thickness of 20 mm at any point; b) a bond between
41、 the facing and backing mixes shall be made either by a mechanical key or by inter- diffusion. Licensed Copy: London South Bank University, London South Bank University, Fri Nov 16 07:55:28 GMT+00:00 2007, Uncontrolled Copy, (c) BSI 5 Reinforcement Untreated steel shall have actual minimum covers of
42、 40 mm from any visual face and 30 mm from any other exposed face. Such reinforcement shall neither be placed closer than 10 mm to the interface of stone, nor across the interface unless the cementitious binder used in both mixes is identical. Galvanized steel shall have actual minimum covers of 30
43、mm from any visual face and 20 mm from any other exposed face. Such reinforcement shall neither be placed closer than 10 mm to the interface of cast stone units, nor across the interface unless the cementitious binder used in both mixes is identical. Non-corroding metals (e.g. austenitic stainless s
44、teel, bronze alloys, copper) or other materials shall have a minimum actual cover of 10 mm or two bar diameters, (of the nearest bars to the surface) whichever is the greater, from any exposed face. Cut galvanized or epoxy-coated reinforcement shall have the cut faces protected by suitable means (e.
45、g. zinc paint and epoxy paint respectively). 6 Compressive strength Three cube test specimens either 100 mm or 150 mm in size shall be made from the facing or homogeneous mix, and where appropriate three further cube specimens 100 mm or 150 mm in size shall be made from the backing mix. The method o
46、f compaction shall be as similar as possible to represent the relevant production and the cubes shall be cured in accordance with BS EN 12390-2 and crushed up to 28 days old in accordance with BS EN 12390-3. The average strength of any set of three cubes shall not be less than 25.0 MPa. In addition,
47、 the strength of any single cube shall not be less than 20 MPa. 7 Surface finish The colour and texture of the visual face shall be the subject of contractual agreement based upon samples and/or mock ups representative of the planned production. 8 Tolerances 8.1 Linear dimensions The actual dimensio
48、ns of individual regular units shall conform to the declared work dimensions subject to the tolerances given below in Table 1. NOTE Tighter tolerances than these may be achieved subject to agreement between purchaser and manufacturer. Table 1 Tolerances Dimension mm Tolerance mm 4 000 6 8.2 Flatness
49、 of plane surface When the visual surfaces are declared by the manufacturer/supplier to be plane, they shall not deviate from a plane by more than 0.3 % of the diagonal length or 2 mm, whichever is the greater, across the two diagonals as measured with appropriate equipment. Licensed Copy: London South Bank University, London South Bank University, Fri Nov 16 07:55:28 GMT+00:00 2007, Uncontrolled Copy, (c) BSI 9 Weathering NOTE 1 Whichever test method
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