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1、BRITISH STANDARD BS 680-2: 1971 Specification for Roofing Slates Part 2: Metric units Licensed Copy: London South Bank University, London South Bank University, Thu Dec 07 06:32:44 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 680-2:1971 This British Standard, having been approved by the Aggregates,
2、 Natural Stone and Quarry Products Industry Standards Committee, was published under the authority of the Executive Board on 21 April, 1971 BSI 02-1999 First published in December, 1944 Published in metric form as Part 2, April, 1971 The following BSI reference relates to the work on this standard:
3、Committee reference: STB/4 ISBN 580 06098 5 Co-operating organizations The Aggregates, Natural Stone and Quarry Products Industry Standards Committee, under whose supervision this British Standard was prepared, consists of representatives of the following Government departments and scientific and in
4、dustrial organizations: British Quarrying and Slag Federation British Ready Mixed Concrete Association British Stone Federation* Cement and Concrete Association Concrete Society Limited English Slate Quarries Association* Federation of Civil Engineering Contractors Federated Quarry Owners of Great B
5、ritain* Institute of Quarrying Institution of Civil Engineers Institution of Municipal Engineers* Institution of Structural Engineers Ministry of Public Buildings and Works* Ministry of Public Building and Works Building Research Station* Ministry of Transport Ministry of Transport Road Research Lab
6、oratory National Federation of Building Trades Employers* Natural Environment Research Council Institute of Geological Sciences Royal Institute of British Architects Sand and Ballast Hauliers and Allied Trades Alliances Ltd. Society of Chemical Industry The Government departments and scientific and
7、industrial organizations marked with an asterisk in the above list, together with the following, were directly represented on the committee entrusted with the preparation of this standard: British Precast Concrete Federation Institute of Building Modular Society National Federation of Roofing Contra
8、ctors North Wales Slate Quarries Association Royal Institution of Chartered Surveyors Amendments issued since publication Amd. No.Date of issueComments 9212September 1996 Indicated by a sideline in the margin Licensed Copy: London South Bank University, London South Bank University, Thu Dec 07 06:32
9、:44 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 680-2:1971 BSI 02-1999i Contents Page Co-operating organizationsInside front cover Forewordii 1Scope1 2Characteristics1 3Designation1 4Thickness1 5Marketing description1 6Tests1 Appendix A Preparation of test specimens3 Appendix B Water absorption te
10、st3 Appendix C Wetting and drying test3 Appendix D Sulphuric acid immersion test3 Appendix C Sizes3 Table 1 Standard lengths and widths of slates4 Table 2 Range of lengths for randoms and peggies4 Licensed Copy: London South Bank University, London South Bank University, Thu Dec 07 06:32:44 GMT+00:0
11、0 2006, Uncontrolled Copy, (c) BSI BS 680-2:1971 ii BSI 02-1999 Foreword In order to keep abreast of progress in the industries concerned, British Standards are subject to periodical review. Suggestions for improvements will be recorded and in due course brought to the notice of the committees charg
12、ed with the revision of the standards to which they refer. A complete list of British Standards, numbering over 5 000, fully indexed and with a note of the contents of each, will be found in the British Standards Yearbook. The BS Yearbook may be consulted in many public libraries and similar institu
13、tions. This standard makes reference to the following British Standard: CP 142, Slating and tiling CP 142-2, Metric units This metric edition of BS 680, published as Part 2, has been prepared under the authority of the Aggregates, Natural Stone and Quarry Products Industry Standards Committee, as pa
14、rt of the change to the metric system in the construction industry, giving values in SI units. For further information on SI units, reference should be made to PD 56861). The specification was first issued in 1944. Part 2 is virtually the same but with metric units. Roofing slates which contain carb
15、onate among their mineral constituents are susceptible to attack by the sulphur compounds present in the air. The degree of attack varies with the degree of atmospheric pollution in the locality, being more pronounced in town than in country districts. For this reason the test requirements are diffe
16、rent according to the situation in which the slate is to be used. At the same time the committee responsible for the revised specification recognizes that there are certain slates which will not pass the sulphuric acid immersion test, but which, principally by reason of the thickness in which they a
17、re used, give good service even in polluted atmospheres. For such slates the acid test requirements can be waived if the prospective user is satisfied from experience in the locality that their durability is adequate for his purpose. Some difficulty has been experienced by the committee in regard to
18、 the terms, “Best”, “Strong Best”, “Mediums”, “Strong Mediums”, “Seconds”, “Thirds”, “No. 1”, “No. 2”, “No. 3”, etc., applied by the quarries and it should be recognized that these terms denote thickness and texture rather than durability. Unfortunately they have not necessarily the same meaning whe
19、n applied by different quarries, or even when applied by one quarry to slates from different veins of rock. “Best” slates of one description may be as thick as “Mediums” of another description and “Thirds” from one quarry are not necessarily of the same thickness as “Thirds” from another quarry. It
20、may be accepted, however, that slates classified by the quarries as “Bests” are the thinnest slates produced from each particular vein of rock, i.e. from the finest cleavage of rock described. The terms are applied in the following order: Best, Strong Best, Medium, Strong Medium, Seconds, Thirds. Th
21、e designations No. 1, No. 2 and No. 3 are also used in some cases according to local custom and long established practice, but these terms appear to be limited to certain slates produced in varying widths, No. 1 corresponding approximately to Seconds. It is emphasized that the terms cannot be used t
22、o compare slates of different descriptions. 1) PD 5686, “The use of SI units”. Licensed Copy: London South Bank University, London South Bank University, Thu Dec 07 06:32:44 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 680-2:1971 BSI 02-1999 iii The dimensional co-ordination recommendations2) of Te
23、chnical Committee B/94, “Modular Co-ordination in Building”, are applied where appropriate to the standard. 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. Compliance with a British S
24、tandard 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 4 and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be i
25、ndicated in the amendment table on the inside front cover. 2) “Recommendation for the co-ordination of dimensions in building”. BS 2900, “Glossary of terms”. BS 4011, “Basic sizes for building components and assemblies”. BS 4330, “Controlling dimensions”. PD 6444, “Basic spaces for structure, extern
26、al envelop and internal subdivision”. Part 1: “Functional Groups 1, 2 Silurian; Ordovician; Devonian; and Dalradian, and complying with the requirements set out herein. 2 Characteristics Roofing slates shall be of reasonably straight cleavage and shall ring true when struck. The slates shall be rect
27、angular, but the head corners may be shouldered within one-quarter of the width and one-quarter of the length. The grain shall run longitudinally and not transversely. They may contain naturally ingrained stripes. The surface shall be such as to permit of proper laying of the slates. 3 Designation 3
28、.1 Uniform length slates shall be supplied to one of the sizes listed in Table 1. Slates may be of uniform or varying widths3) as agreed. The minimum width of any slate shall be not less than half its length4). Slates shall be deemed to be graded if, when measured overall in lots for thickness, they
29、 comply with 4.1. Slates, if so ordered, may be supplied ungraded for selection on site. 3.2 Random slates and Peggies shall be within the range of lengths specified in Table 2, suitable for laying in diminishing courses. The width may vary, but shall not be less than half the length for any particu
30、lar slate. They shall be graded as laid down in 4.1. 4 Thickness 4.1 Slates supplied as “graded” shall be selected so that the measured overall thickness of any one lot of 100 slates, selected from an individual consignment and closely packed, shall not exceed in thickness by more than 25 % any othe
31、r lot of 100 slates of the same nominal length, taken from the same consignment. Slates that fail to conform to these limits shall be deemed ungraded and shall be so described. 4.2 The terms “Best”, “Strong Best”, “Medium”, “Strong Medium”, “Seconds”, “Thirds”, “No. 1”, “No. 2”, “No. 3”, etc., appli
32、ed by the quarries shall denote the thickness grading of slates of each particular description, but they shall only be regarded as relative to each separate description and shall not be used to compare slates produced from different veins of rock and separately described by the producing quarry. 5 M
33、arketing description The following particulars shall be provided in relation to slates manufactured in compliance with this British Standard. 1) Name of the source of origin. 2) Name of colour, vein of rock, or particular description by which the slates are known. 3) Thickness, graded or ungraded. I
34、f graded, the details shall be in the terms of the producing quarry, for the average thickness per 100 slates (see Clause 4). If ungraded, this shall be stated (see Clause 4). 4) Length and width. Varying widths shall be stated. In the case of slates sold as “Randoms” or “Peggies (see 3.2) the range
35、 of lengths shall be stated. 6 Tests 6.1 Slates shall be subjected to one or other of the following series of tests as prescribed in 6.2 or 6.3, as may be specified by the purchaser when inviting quotations or before placing an order. It is recommended that the tests prescribed in 6.2 be specified w
36、here slates are intended for use under conditions of severe or moderate atmosphere pollution by sulphurous or other acid fumes, and that those in 6.3 are appropriate for slates to be used under conditions of slight atmospheric pollution by sulphurous or other acid fumes. NOTEIt is not practicable to
37、 define conditions of “slight”, “moderate”, or “severe” atmospheric pollution. Records for districts where local authorities make systematic observations can be found in the reports on The Investigation of Atmospheric Pollution (H.M. Stationery Office). These may afford some guidance. Generally the
38、purchaser will need to use his own judgement, bearing in mind that atmospheric pollution is caused by domestic as well as by industrial fires. 6.2 Slates intended for use under conditions of severe or moderate atmospheric pollution by sulphurous or other acid fumes 6.2.1 Water absorption test. The s
39、lates shall have a water absorption not exceeding 0.3 % when subjected to the test set out in Appendix B. 3) See 3.2.1.2 and 3.2.1.5 of CP 142:1970, “Slating and tiling”, Part 2,“Metric units”. 4) Certain slates are marketed having a width of less than half their length and may be satisfactory in su
40、itable circumstances. Licensed Copy: London South Bank University, London South Bank University, Thu Dec 07 06:32:44 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 680-2:1971 2 BSI 02-1999 6.2.2 Wetting and drying tests. None of the test specimens, when subjected to the test set out in Appendix C, sh
41、all show signs of delamination or splitting along the edges when examined through a lens giving a magnification of about two diameters, nor of flaking of the surface. 6.2.3 Sulphuric acid immersion test. None of the test specimens, when subjected to the test set out in Appendix D, shall show signs o
42、f delamination along the edges when examined through a lens giving a magnification of about two diameters nor of swelling, softening or flaking of the surface and shall not exhibit gaseous evolution during immersion5). 6.3 Slates intended for use under conditions of slight atmospheric pollution by s
43、ulphurous or other acid fumes 6.3.1 Water absorption test. The slates shall have a water absorption not exceeding 0.3 % when subjected to the test set out in Appendix B. 6.3.2 Wetting and drying test. None of the test specimens, when subjected to the test set out in Appendix C, shall show signs of d
44、elamination or splitting along the edges when examined through a lens giving a magnification of about two diameters, nor of flaking of the surface. 5) It is recognized that certain slates which will not pass this test may give good service under the atmospheric conditions outlined. If the use of suc
45、h slates is contemplated, the purchaser should satisfy himself from local experience in regard to their likely behaviour. Licensed Copy: London South Bank University, London South Bank University, Thu Dec 07 06:32:44 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 680-2:1971 BSI 02-19993 Appendix A Pr
46、eparation of test specimens A.1 Specimens for testing shall measure 50 mm by 50 mm by the thickness of the slate. A.2 Each test requires three specimens, each of which shall be prepared from a different slate taken at random from a larger bulk to the satisfaction of the testing authority. A.3 The sp
47、ecimens shall be cut with a suitable tool and with care to avoid cracking or splintering the slate. All the edges shall be ground with water and a fine abrasive to give a smooth finish. Every care shall be taken to avoid the use of specimens having cracks or other defects caused in the preparation.
48、Appendix B Water absorption test B.1 Three specimens prepared in the manner described in Appendix A shall be dried to constant weight in an oven at 105 C over a period of about 48 hours. B.2 They shall then be submerged in distilled water in a suitable receptacle provided with a reflux condenser and
49、 shall be kept gently and continuously boiling for 48 hours. B.3 After cooling in air for 5 minutes they shall be placed in cold water and allowed to stand for 30 minutes in the room in which they are to be weighed. B.4 They shall then be weighed after removing surplus water by shaking followed by wiping with a damp cloth. Weighings shall be made to the nearest 0.001 g. B.5 The increase in weight of each specimen shall be calculated as a percentage of its dry weight. B.6 The average of the three values so obtained shall be deemed to be the water absorption of the slate
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