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1、| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | BRITISH STANDARD BS 1217 : 1997 Incorporat
2、ing Amendment No.1 ICS 91.100.20; 91.100.30 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW Specification for Cast stone Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 24 08:30:29 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 1217 : 1997Issue 2, January 1998 This British
3、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 15 March 1997 BSI 1998 First published April 1945 Second edition April 1975 Third edition September 1986 Fourth
4、 edition March 1997 The following BSI references relate to the work on this standard: Committee reference B/524 Draft for comment 95/107745 DC ISBN 0 580 27062 9 Amendments issued since publication Amd. No.DateText affected 9785January 1998 Indicated by a vertical line in the margin Committees respo
5、nsible for this British Standard The preparation of this British Standard was entrusted to Technical Committee B/524, Precast concrete products, upon which the following bodies were represented: British Cement Association British Precast Concrete Federation Ltd. Concrete Society County Surveyors Soc
6、iety Department of the Environment (Property and Buildings Directorate) Federation of Civil Engineering Contractors Institution of Civil Engineers Institution of Structural Engineers Royal Institute of British Architects Water Services Association of England and Wales The following body was also rep
7、resented in the drafting of the standard, through subcommittees and panels: United Kingdom Cast Stone Association Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 24 08:30:29 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Issue 1, January 1998BS 1217 : 1997 BSI 1998a Summary of pages The following ta
8、ble identifies the current issue of each page. Issue 1 indicates that a page has been introduced for the first time by amendment. Subsequent issue numbers indicate an updated page. Vertical sidelining on replacement pages indicates the most recent changes (amendment, addition, deletion). PageIssuePa
9、geIssue Front cover Inside front cover a b i ii 1 2 2 1 blank original 2 original 2 3 4 5 6 Inside back cover Back cover 2 original original original original original original Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 24 08:30:29 GMT+00:00 2006, Uncontrolled Copy, (c) BSI bblank Licensed
10、Copy: sheffieldun sheffieldun, na, Fri Nov 24 08:30:29 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 1217 : 1997 BSI 1997i Contents Page Committees responsibleInside front cover Forewordii Specification1 1Scope1 2References1 3Definitions1 4Materials1 5Two-part mix units1 6Reinforcement1 7Mix samplin
11、g for cube strength determination2 8Surface finish2 9Tolerances2 10Weathering2 11Marking2 Annexes A(normative) CAT weathering3 B(informative) General notes for guidance3 C(informative) Guidance on slenderness ratios (SR)4 Tables 1Tolerances2 B.1Selection guidance to specifier with reference to the m
12、anufacturing method of cast stone units4 Figure C.1Typical sections of cast stone product illustrating the inscribed or superscribed circle for estimating the slenderness ratio5 List of references6 Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 24 08:30:29 GMT+00:00 2006, Uncontrolled Copy, (c)
13、 BSI ii BSI 1998 BS 1217 : 1997Issue 2, January 1998 | | Foreword This revision of this British Standard was prepared by Technical Committee B/524 and supersedes BS 1217 : 1986 which is withdrawn. Several innovations have been introduced, the primary one being the division of material and product re
14、quirements. 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 initial surface absorption test (ISAT), each test having a single specification limit. The reasoning behin
15、d 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, has been moved to annex C (informative) with accompanying figure. b) Due to there being insufficient dat
16、a 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 banned, this has resulted in there being no test specification for product strength, only cube strength. Th
17、e 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 future revision. c) Drying shrinkage requirements have also been deleted and guidance may be obtained fro
18、m BS 5628 : Part 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 instantly demoulded and the wet-cast mix design generally left in the mould overnight. No referenc
19、e 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 : Section 5.2 with this standard and action is being taken to clarify the situation. Compliance with a British Standard does not o
20、f itself confer immunity from legal obligations. Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 24 08:30:29 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BSI 19971 BS 1217 : 1997 Specification 1 Scope This British Standard specifies materials, tolerances and minimum performance levels for cast sto
21、ne. Products such as reconstructed stone masonry units conforming to BS 6457 and precast concrete masonry units conforming to BS 6073 : Parts 1 and 2 are not covered by this standard. 2 References 2.1 Normative references This British Standard incorporates, by dated or undated reference, provisions
22、from other publications. These normative references are made at the appropriate places in the text and the cited publications are listed on page 6. For dated references, only the edition cited applies; any subsequent amendments to or revisions of the cited publication apply to this British Standard
23、only when incorporated in the reference by amendment or revision. For undated references, the latest edition of the cited publication applies, together with any amendments. 2.2 Informative references This British Standard refers to other publications that provide information or guidance. Editions of
24、 these publications current at the time of issue of this standard are listed on the inside back cover, but reference should be made to the latest editions. 3 Definitions For the purposes of this British Standard the following definitions apply. 3.1 cast stone Any material manufactured with aggregate
25、 and cementitious binder, intended to resemble in appearance, and which may be used in a similar way to, natural stone. Cast stone units are either homogeneous throughout or consist of facing and backing materials (see also clause 4). 3.2 visual face Any face or part of a cast stone unit visible aft
26、er 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 exposed to a cavity are examples of exposed faces. Visual faces are exposed faces but not necessarily vice versa. 4 Ma
27、terials 4.1 Binders and binder constituents Cast stone shall be made using one of the following binders conforming to the appropriate standard: Portland cementBS 12; Portland blastfurnace cementBS 146; Portland pulverized-fuel ash cementBS 6588; sulfate-resisting Portland cementBS 4027. The binder s
28、hall be used either by itself or, for cements conforming to BS 12, in combination with one of the following binder constituents: ground granulated blastfurnace slagBS 6699; pulverized-fuel ashBS 3892 : Part 1. 4.2 Aggregates Aggregates, apart from grading requirement, used shall conform to the appro
29、priate standard as follows: natural aggregatesBS 882; lightweight aggregates used in backing concreteBS 3797; pulverized-fuel ashBS 3892 : Part 1 or 2. 4.3 Admixtures Admixtures may be used and, where relevant, shall conform to the appropriate Part of BS 5075. Calcium chloride shall not be used. 4.4
30、 Pigments Pigments in powder, granular or paste form shall conform to BS 1014. 5 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 the facing and backing mixes s
31、hall be made either by a mechanical key or by inter-diffusion. 6 Reinforcement 6.1 Untreated steel (other than austenitic stainless steel conforming to BS 6744) shall have actual minimum covers of 40 mm from any visual face and 30 mm from any other exposed face. Such reinforcement shall neither be p
32、laced closer than 10 mm to the interface of stone conforming to clause 4 of this standard, nor across the interface unless the cementitious binder used in both mixes is identical (see B.4). 6.2 Galvanized steel shall have actual minimum covers of 30 mm from any visual face and 20 mm from any other e
33、xposed face. Such reinforcement shall neither be placed closer than 10 mm to the interface of cast stone units conforming to clause 4 of this standard, nor across the interface unless the cementitious binder used in both mixes is identical. Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 24 08:3
34、0:29 GMT+00:00 2006, Uncontrolled Copy, (c) BSI 2 BSI 1998 BS 1217 : 1997Issue 2, January 1998 6.3 Non-corroding metals (e.g. austenitic stainless steel, bronze alloys, copper) shall have a minimum actual cover of 10 mm or two bar diameters, (of the nearest bars to the surface) whichever is the grea
35、ter, from any exposed face. 6.4 Cut galvanized or epoxy-coated reinforcement shall have the cut faces protected by suitable means (e.g. zinc paint and epoxy paint respectively). 7 Mix sampling for cube strength determination Three cube test specimens either 100 mm or 150 mm in size shall be made fro
36、m 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 of compaction shall be as similar as possible to represent the relevant production and the cubes shall be cured in accordance with BS 1881 : Par
37、t 108 and crushed up to 28 days old in accordance with BS 1881 : Part 116. The average strength of any set of three cubes shall not be less than 25.0 MPa. In addition, the strength of any single cube shall not be less than 20 MPa. 8 Surface finish The colour and texture of the visual face shall be t
38、he subject of contractual agreement based upon samples and/or mock ups representative of the planned production. 9 Tolerances 9.1 Linear dimensions The actual dimensions of individual regular units shall conform to the declared work dimensions subject to the tolerances given below in table 1. NOTE.
39、Tighter tolerances than these may be achieved subject to agreement between purchaser and manufacturer. Table 1. Tolerances DimensionTolerance mmmm 4000 6 9.2 Flatness of plane surface When the visual surfaces are declared by the manufacturer/supplier to be plane, they shall not deviate from a plane
40、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. | | 9.3 Squareness Using the Pythagorean technique, the out-of-squareness of any corner declared by the manufacturer/supplier to be square, shall not exceed 2
41、 % of the diagonal length. 10 Weathering NOTE 1. Whichever test method is selected the three products will need to be of convenient sizes to suit the test requirements but cutting is not permitted. NOTE 2. The establishment of CAT or ISAT conformity is not expected to be on as regular a basis as cub
42、e testing. The data relevant to any specific mix will be expected to be held by the manufacturer and should not be more than one year old. 10.1 Capillary absorption test (CAT) Three representative products at least 17 days old, tested according to annex A shall not exhibit an average capillary absor
43、ption (C) exceeding 1.0 mg/mm2nor shall any individual value of C(C1etc.) exceed 1.3 mg/mm2. 10.2 Initial surface absorption test (ISAT) Three representative products at least 14 days old and stored in warm dry conditions at not less than 15 C for at least 72 h shall be tested according to the metho
44、d in BS 1881 : Part 208. The values obtained shall not exceed 0.25 ml/(m2s) at 10 min and 0.10 ml/(m2s) at 1 h for each product. 11 Marking The following particulars shall be clearly marked on the delivery note, drawings, invoice or suppliers certificate supplied with a consignment of cast stone pro
45、ducts: a) the name, trade mark or other means of identification of the manufacturer; b) the weathering class, i.e. CAT and/or ISAT (see clause 10); c) the number and date of this British Standard, i.e. BS 1217 : 1997. NOTE. Marking BS 1217 : 1997 on or in relation to a product is a claim by the manu
46、facturer that the product has been manufactured to the requirements of this standard. The accuracy of such a claim is therefore solely the manufacturers responsibility. Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 24 08:30:29 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 1217 : 1997 BSI 19973
47、 Annexes Annex A (normative) CATweathering Measure the visual test face of each product by suitable means and record the area of each in square millimetres to the nearest 10 mm2. Record as A1, A2, A3. At not less than 14 days old, dry the three products in a well ventilated oven or ovens at (705) C
48、for at least 72 h and allow to cool to room temperature (15 to 25) C in an air-tight enclosure. Weigh and record the mass of each unit to the nearest gram on a balance, accurate to 0.5 g. Record as W1, W2, W3. Place each product, supported on suitable spacer devices, into a tray and fill with cold w
49、ater so that the visual face under test is under a maintained (51) mm head of water. After (100.5) min, remove each product; remove excess water with a damp rag and within 30 s of the removal, reweigh and record the masses as above. Record as X1, X2, X3. Calculate the capillary absorption C1(in mg/mm2) to the nearest 0.1 mg/mm2: C1= 1000(X12 W1) A1 Similarly repeat the calculation for C2and C3 substituting the relevant values of X and W. Finally calculate the mean value C(in mg/mm2) as: C = C1+ C2+ C3 3 Annex B (informative) General notes for guidance