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1、BRITISH STANDARD BS 1105:1981 Specification for Wood wool cement slabs up to 125 mm thick UDC 691.115 412:674.821 412 Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 24 08:27:41 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 1105:1981 This British Standard, having been prepared under the directio
2、n of the Elements and Components (of Diverse Materials) for Buildings Standards Committee, was published under the authority of the Executive Board and comes into effect on 30 September 1981 BSI 06-1999 First published January 1943 First revision November 1951 Second revision March 1963 Third revisi
3、on December 1972 Fourth revision The following BSI references relate to the work on this standard: Committee reference ECB/39 Draft for comment 79/13051 DC ISBN 0 580 12178 X Cooperating organizations The Elements and Components (of Diverse Materials) for Buildings Standards Committee, under whose d
4、irection this British Standard was prepared, consists of representatives from the following: Agrment Board Aluminium Federation Asbestos Cement Manufacturers Association Limited Brick Development Association British Ceramic Research Association British Hardware Federation British Plastics Federation
5、 British Precast Concrete Federation Ltd*. British Steel Industry British Woodworking Federation Consumer Standards Advisory Committee of BSI Convention of Scottish Local Authorities Department of the Environment (PSA)* Department of the Environment (Building Research Establishment, Princes Risborou
6、gh Laboratory) Department of the Environment (Housing and Construction) Flat Glass Manufacturers Association Glass and Glazing Federation Health and Safety Executive* Incorporated Association of Architects and Surveyors Institute of Building Control Institute of Quality Assurance Institution of Muni
7、cipal Engineers Institution of Structural Engineers* Mastic Asphalt Council and Employers Federation* National Council of Building Materials Producers National Federation of Building Trades Employers National Federation of Roofing Contractors* Royal Institute of British Architects* Royal Institution
8、 of Chartered Surveyors Scottish Development Department Society of Chemical Industry Timber Research and Development Association Trades Union Congress The organisations marked with an asterisk in the above list, together with the following, were directly represented on the Technical Committee entrus
9、ted with the preparation of this British Standard: Department of the Environment (Building Research Establishment) Felt Roofing Contractors Advisory Board Fire Offices Committee Greater London Council Modular Society Limited National Joint Council for the Building Industry (Operatives Side) Structur
10、al Insulation Association The Wood Wool Slab Manufacturers Association Wood Wool Building Slab Manufacturers Association Amendments issued since publication Amd. No.Date of issueComments Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 24 08:27:41 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 110
11、5:1981 BSI 06-1999i Contents Page Cooperating organizationsInside front cover Forewordii 1Scope1 2References1 3Definition1 4Classification1 5Manufacture and materials1 6Form and texture1 7Tolerances on length and width1 8Nominal thickness and mass1 9Thermal conductivity2 10Strength test (type A and
12、type B slabs)2 11Impact and load test (type SB slabs)2 12Fire performance2 13Sampling and testing2 14Marking of slabs2 15Manufacturers certificate2 Appendix A Method of determining chloride ion content3 Appendix B Method of measuring thickness of slabs3 Appendix C Method of weighing slabs3 Appendix
13、D Method of measuring thermal conductivity3 Appendix E Method of testing strength (types A, B and SB)3 Appendix F Method of testing for impact and load resistance (type SB)4 Appendix G Sound absorption properties6 Figure 1 Rig for testing strength of slabs4 Figure 2 Typical impact and load test rig:
14、 type SB slabs5 Table 1 Nominal thickness and mass of slabs (air-dry)1 Table 2 Minimum sound absorption co-efficients for two methods of mounting6 Publications referred toInside back cover Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 24 08:27:41 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 1
15、105:1981 ii BSI 06-1999 Foreword This British Standard has been revised under the direction of the Elements and Components (of Diverse Materials) for Buildings Standards Committee. This standard has been revised to include type SB wood wool cement slabs which, in the opinion of the Health and Safety
16、 Executive, comply with the requirements of Regulation 36 (1) of the Construction (Working Places) Regulation 1966. Type SB slabs, whilst complying with all the requirements of the type B slab, also comply with the requirements of the new impact and load test (see Appendix F). Type SB slabs are inte
17、nded to provide a safe working environment for roofing operatives. Their use does not necessitate any change in weather proofing specifications or laying techniques. In accordance with the change to the metric system this standard has been metricated giving values in terms of SI units. For further i
18、nformation on SI units reference should be made to BS 3763. The recommendations for the co-ordination of dimensions in building as laid down in BS 4011, BS 4330, and BS 4606 are embodied where appropriate in this standard. A British Standard does not purport to include all the necessary provisions o
19、f a contract. Users of British Standards are responsible for their correct application. 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 and ii, pages 1 to 6, an inside
20、 back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 24 08:27:41 GMT+00:00 2006, Uncontrolled Copy, (c)
21、BSI BS 1105:1981 BSI 06-19991 1 Scope This British Standard specifies the thickness, mass, strength, impact resistance and thermal conductivity requirements of wood wool cement slabs up to 125 mm thick and in three types. The requirements of this standard also apply to slabs which are further proces
22、sed, e.g. channel reinforced, pre-felted or pre-screeded. Where acoustic properties are required reference shall be made to Appendix G. 2 References The titles of the publications referred to in this standard are listed on the inside back cover. 3 Definition For the purposes of this British Standard
23、 the following definition applies. wood wool cement slab a slab consisting of long wood fibres which are chemically treated, mixed with Portland cement, compressed, matured and accurately trimmed to size 4 Classification The slabs are of three types as follows. Type A. Slabs intended for non-loadbea
24、ring application, e.g. partitions, ceilings, wall linings, and roof insulation. They are also suitable for permanent shuttering. Type B. Slabs with a nominal thickness of not less than 50 mm possessing greater strength than type A slabs and which are intended to be used for roof construction provide
25、d that the safety precautions of the Construction (Working Places) Regulation 1966, where applicable, are followed. They are also suitable for the purposes indicated for type A slabs. Type SB. Slabs with a nominal thickness of not less than 50 mm possessing greater strength than type A slabs and gre
26、ater resistance to impact than type B slabs, and intended particularly for use in roof construction without being subject to the requirements of Regulation 36 (1) of the Construction (Working Places) Regulation 1966. They are also suitable for the purposes indicated for type A slabs and type B slabs
27、. 5 Manufacture and materials The slabs shall consist essentially of wood wool and Portland cement conforming to the specifications of BS 12 mixed together, pressed and matured. The timber shall be free of substances that can have a deleterious effect on cement and in this respect pines and spruce a
28、re generally acceptable. The level of chloride ion content expressed as a percentage shall not exceed 0.22 % by mass of cement when determined in accordance with Appendix A. Any other additive or materials used shall be compatible with the basic materials and shall not adversely affect the finished
29、slab in any way. 6 Form and texture The slabs shall be of uniform thickness 3 mm when tested in accordance with Appendix B and have flat faces of substantially even texture with clean reasonably square edges. 7 Tolerances on length and width The tolerances for length and width of slabs shall be + 0,
30、 6 mm. NOTEIt is recommended that length and width be the subject of agreement between the purchaser and the manufacturer. 8 Nominal thickness and mass The nominal thickness of slabs shall be as shown in Table 1. When tested in accordance with Appendix C, the mass of slabs shall not exceed the value
31、s shown in Table 1. Table 1 Nominal thickness and mass of slabs (air-dry) Nominal thicknessMaximum value mm kg/m2 2518 3825 5031 6435 7541 10047 12553 Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 24 08:27:41 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 1105:1981 2 BSI 06-1999 9 Thermal condu
32、ctivity The thermal conductivity of slabs with a nominal thickness of 25 mm or 38 mm shall not exceed 0.1 W/(m K) and the thermal conductivity of slabs with a nominal thickness of 50 mm or greater shall not exceed 0.093 W/(m K) when tested in accordance with the method referred to in Appendix D. NOT
33、ECalculations of thermal transmittance should be made using data on thermal conductivity values determined in accordance with BS 874. The manufacturer should supply the results of tests carried out by an independent test house. 10 Strength test (type A and type B slabs) This test shall be conducted
34、in accordance with Appendix E and shall be applied to slabs with a nominal thickness of 38 mm or greater. Type A slabs with a nominal thickness of 38 mm or greater shall be capable of supporting a load of 1.0 kN. Type B slabs with a nominal thickness of 50 mm or greater shall be capable of supportin
35、g a load of 2.2 kN. 11 Impact and load test (type SB slabs) The impact and load test for type SB slabs shall be conducted in accordance with Appendix F and shall be applied to SB slabs not previously tested under the strength test (see clause 10) with a nominal thickness of 50 mm or greater. The sla
36、bs shall be capable of withstanding the impact of a 45 kg mass dropped from a 1 200 mm height (see F.4) and a static load of 1.32 kN. In addition SB slabs shall comply with all the requirements of the type B slab. 12 Fire performance Slabs shall have a class 1 surface spread of flame rating and a fi
37、re propagation index (I) not exceeding 12.0 and a sub-index (i) not exceeding 6.0. The spread of flame classification shall be determined in accordance with the procedure described in BS 476-7. The fire propagation indices shall be determined in accordance with BS 476-6. 13 Sampling and testing 13.1
38、 Strength, impact load test. Manufacturers shall carry out sampling for the tests described in Appendix B (clause 6), Appendix C (clause 8), Appendix E (clause 10) and Appendix F (clause 11) at the rate of six representative slabs for each 1 000 slabs produced. If further tests in accordance with Ap
39、pendix B (clause 6), Appendix C (clause 8), Appendix E (clause 10) and Appendix F (clause 11) are required by the purchaser, a maximum of six representative slabs shall be tested from each 1 000 or part thereof, delivered or sorted at works ready for delivery. Slabs broken or damaged shall not be in
40、cluded in the sample. Selection of representative slabs shall be by agreement of both parties or, if necessary, by agreement with a third party. 13.2 Fire, thermal and acoustic tests. (See clause 12, Appendix D and Appendix G.) Manufacturers shall undertake to maintain the appropriate test results a
41、gainst the relative British Standard carried out by an independent testing house, these results to be available on request. 14 Marking of slabs All type B slabs shall be clearly marked with a white line of width not less than 25 mm on one short edge. All type SB slabs shall be clearly marked with a
42、green line and a white line each of a width not less than 25 mm on one short edge. 15 Manufacturers certificate If requested, the manufacturer shall certify that the slabs in any consignment comply with the requirements of this British Standard. Any certificate issued for this purpose shall state th
43、e number of this British Standard, i.e. BS 1105, and the type of slab, i.e. type A, type B, or type SB1). 1) Marking BS 1105 on or in relation to a product is a claim by the manufacturer that the product has been manufactured in accordance with the requirements of the standard. The accuracy of such
44、a claim is therefore solely the manufacturers responsibility. Enquiries as to the availability of third party certification to support such claims should be addressed to the Director, Quality Assurance Division, BSI, Maylands Avenue, Hemel Hempstead, Herts HP2 4SQ in the case of certification marks
45、administered by BSI or to the appropriate authority for other certification marks. Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 24 08:27:41 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 1105:1981 BSI 06-19993 Appendix A Method of determining chloride ion content A.1 Selection of slabs. This t
46、est for determining chloride ion content shall be conducted on three slabs selected from each 1 000 slabs or part thereof delivered, or sorted at works ready for delivery. A.2 Sampling. Cut cylindrical specimens 25 mm in diameter of full slab thickness from each slab. Take three specimens from each
47、slab, their positions being determined by drawing a diagonal across the rectangular slab and marking the centre of the slab and two other positions, one at each end of the diagonal, located about 300 mm from the corner of the slab. A.3 Conditioning. Condition the nine cylindrical specimens in an atm
48、osphere of 20 2 C and 65 5 % r.h. until constant mass is obtained. A.4 Preparation of sample. Grind the nine conditioned specimens so that all material passes a 300 4m (52 mesh) sieve complying with the requirements of BS 410. Then thoroughly mix this bulk sample and weigh out 10 g accurately into a
49、 suitable flask for analysis. A.5 Analytical procedure A.5.1 Principle. Chloride ions are extracted into water and precipitated with silver nitrate. The excess silver nitrate is back-titrated with thiocyanate. A.5.2 Reagents. Phenolphthalein solution (0.5 %), nitric acid (1 + 1), silver nitrate (0.1 N), potassium thiocyanate (0.1 N), nitrobenzene, ferric alum solution (25 %). A.5.3 Procedure. To the flask containing the 10 g sample add 100 ml of distilled water, stopper and agitate for 5 min. To a 25 ml aliquot of filtered or centrifuged solution, a
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