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1、BRITISH STANDARD BS 8204-2: 1987 In-situ floorings Part 2: Code of practice for concrete wearing surfaces UDC 693.73:692.533.15 Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 05:33:08 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 8204-2:1987 This British Standa
2、rd, having been prepared under the direction of the Elements and Components (of Diverse Materials) for Buildings Standards Committee, ECB/-, was published under the authority of the Board of BSI and comes into effect on 30 October 1987 BSI 01-1999 The following BSI references relate to the work on t
3、his standard: Committee reference ECB/5 Draft for comment 83/11598 ISBN 0 580 15924 8 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Elements and Components (of Diverse Materials) for Buildings Standards Committee (ECB/-) to Technical C
4、ommittee ECB/5, upon which the following bodies were represented: Association of Lightweight Aggregate Manufacturers British Aggregate Construction Materials Industries British Concrete Pumping Association British Plastics Federation Building Employers Confederation Cement and Concrete Association C
5、hartered Institute of Building Concrete Society Contract Flooring Association Department of the Environment Building Research Establishment Department of the Environment (Property Services Agency) Federation of Associations of Specialists and Subcontractors Federation of Epoxy Resin Formulators and
6、Applicators Institute of Quantity Surveyors Institution of Civil Engineers Institution of Structural Engineers Mastic Asphalt Council and Employers Federation Mortar Producers Association Limited National Federation of Plastering Contractors National Federation of Terrazzo-mosaic Specialists Plastic
7、s and Rubber Institute Royal Institute of British Architects Sand and Gravel Association Scottish Master Plasterers Association Society of Chemical Industry Amendments issued since publication Amd. No.Date of issueComments Licensed Copy: London South Bank University, London South Bank University, Fr
8、i Dec 08 05:33:08 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 8204-2:1987 BSI 01-1999i Contents Page Committees responsibleInside front cover Forewordiii 1Scope1 2Definitions1 3Exchange of information and time schedule1 3.1General1 3.2Exchange of information1 3.3Time schedule1 4Materials2 4.1Cemen
9、t2 4.2Aggregates2 4.3Pigments2 4.4Admixtures2 4.5Surface treatments2 4.6Abrasives and sprinkle finish aggregates2 5Design considerations: General5 5.1Sub-base5 5.2Methods of construction5 5.3Liability to cracking and curling of slabs and toppings5 5.4Tolerances on level and surface regularity6 5.5Ad
10、mixtures7 5.6Surface treatments7 5.7Sprinkle finish and special aggregates7 5.8Resistance to abrasion7 5.9Resistance to chemical attack8 5.10 Slip resistance8 5.11 Thickness of direct finished slabs8 5.12 Bay sizes for direct finished slabs9 5.13 Joints in direct finished ground-supported slabs9 5.1
11、4 Damp-proofing concrete toppings and direct finished floors9 5.15 Direct finishing of in-situ concrete suspended floors9 6Design considerations: Toppings11 6.1Mix proportions11 6.2Thickness11 6.3Accommodation of services11 6.4Thickness of stair toppings11 6.5Bay sizes11 6.6Joints12 6.7Toppings on s
12、uspended floors12 7Work on site: General12 7.1Workmanship12 7.2Protection of the surface12 7.3Protection against the weather13 7.4Quality of concrete13 7.5High alumina cement concrete13 7.6Compacting and levelling13 7.7Finishing the surface13 7.8Curing14 Licensed Copy: London South Bank University,
13、London South Bank University, Fri Dec 08 05:33:08 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 8204-2:1987 ii BSI 01-1999 7.9Surface treatment14 8Work on site: Toppings15 8.1Preparation of the base15 8.2Batching and mixing15 8.3Laying stair toppings15 9Inspection and testing of wearing surfaces16 9
14、.1Inspection16 9.2Testing16 9.3Levels and surface regularity16 9.4Adhesion of bonded toppings to the base16 10Maintenance16 Appendix A Recommended method for the assessment of levels and surface regularity17 Appendix B References17 Figure 1 Illustration of layers in a concrete ground floor3 Figure 2
15、 Illustration of layers in a suspended concrete floor4 Figure 3 Slip gauges for checking floor level tolerances17 Table 1 Classification of surface regularity for wearing surfaces6 Table 2 Classification of abrasion resistance: recommendations for concrete flooring10 Publications referred toInside b
16、ack cover Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 05:33:08 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 8204-2:1987 BSI 01-1999iii Foreword This Part of BS 8204, which has been prepared under the direction of the Elements and Components (of Diverse Mate
17、rials) for Buildings Standards Committee, gives recommendations for the laying of in-situ concrete wearing surfaces. BS 8204 is published in separate Parts as follows: Part 1: Code of practice for concrete bases and screeds to receive in-situ flooring; Part 2: Code of practice for concrete wearing s
18、urfaces. Parts dealing with terrazzo, mastic asphalt, polymer modified cement, magnesium oxychloride and cold setting resin in-situ floorings are to be prepared. Part 2 of BS 8204 supersedes section two of CP 204-2 which is deleted by amendment. It covers direct finished concrete surfaces and high s
19、trength concrete toppings (including those previously known as granolithic). Particular attention has been paid to the bonding of toppings and the prevention of cracking and curling. Three grades of surface regularity and four classes of abrasion resistance have been introduced for selection by the
20、designer. 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 Standard does not of itself confer immunity from legal obligations. Summary of pages This document
21、comprises a front cover, an inside front cover, pages i to iv, pages 1 to 18, an inside 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: L
22、ondon South Bank University, London South Bank University, Fri Dec 08 05:33:08 GMT+00:00 2006, Uncontrolled Copy, (c) BSI iv blank Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 05:33:08 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 8204-2:1987 BSI 01-19991 1 S
23、cope This Part of BS 8204 gives recommendations for the installation of in-situ concrete wearing surfaces, including direct finished concrete slabs and high strength concrete toppings. It applies to both suspended floors and slabs supported by the ground. Polymer/concrete toppings are not included a
24、nd will be covered in another Part of BS 8204. NOTEThe titles of the publications referred to in this standard are listed on the inside back cover. References to other publications are identified in the text by numbers in square brackets and are listed in appendix B. 2 Definitions For the purposes o
25、f this Part of BS 8204, the following definitions apply. Definitions of terms given in BS 2787, BS 4049 and BS 6100-1 and BS 6100-6, other than the terms given below, also apply. NOTELayers in a concrete ground floor and a suspended concrete floor are illustrated in Figure 1 and Figure 2 respectivel
26、y. 2.1 flooring uppermost fixed layer of a floor that is designed to provide a wearing surface 2.2 direct finished base slab concrete base slab that is suitably finished to serve directly as a wearing surface without the need for an additional topping 2.3 topping layer of high strength concrete that
27、 serves as a flooring and provides a dense abrasion resistant wearing surface on a concrete base 3 Exchange of information and time schedule 3.1 General Consultations and exchange of information between all parties concerned with the building operations should be arranged at an early date, so that e
28、ach may have full knowledge of the particulars of the work and be able to cooperate in producing the conditions required by the others to complete a satisfactory job. 3.2 Exchange of information The designer should provide in good time all relevant information to those responsible for laying the flo
29、oring and to others whose work may be affected including whichever of the following are applicable: a) description, situation and address of site and means of access; b) those conditions of contract which may practically affect this particular work; c) location and area of floors to be covered; d) a
30、ge and nature of the base and any preparatory treatment required; e) finished floor level and maximum permissible departure from datum; f) class of surface regularity; g) type of damp-proofing and insulation; h) type and thickness of topping; i) any work consequent upon services passing through the
31、flooring; j) treatment of joints; k) treatment of skirtings; l) treatment of junctions with adjacent floors and floorings; m) type of surface finish; n) any surface sealing or chemical surface hardening required; o) any special requirements related to underfloor heating; p) minimum time interval bet
32、ween stages of work and the application of heat in the building; q) date for the completion of preliminary work; r) dates for the start and completion of various sections of the floor; s) details of any compliance testing required. 3.3 Time schedule In considering the time schedule, in addition to t
33、he usual intervals between commencement and completion of work by the various trades involved, additional allowances should be made for the following: a) laying underfloor services; this should preferably be completed before the base is formed, as there is a risk of subsequent cracking if services a
34、re embodied in the flooring; b) curing and drying of the base concrete before the flooring is laid, where appropriate; c) curing of the flooring; d) period of protection of the completed floor from damage by other trades, including restriction of access. Licensed Copy: London South Bank University,
35、London South Bank University, Fri Dec 08 05:33:08 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 8204-2:1987 2 BSI 01-1999 4 Materials 4.1 Cement The cement should be one of the following: a) Portland cement complying with BS 12. b) Portland-blastfurnace cement complying with BS 146-2 (see note 1). c
36、) High alumina cement complying with BS 915 (see note 2). d) Sulphate-resisting Portland cement complying with BS 4027. e) Portland pulverized-fuel ash cement complying with BS 6588 (see note 1). f) Combinations of Portland cement with granulated blastfurnace slag or pulverized fuel ash. The proport
37、ions of granulated blast furnace slag or pulverized fuel ash should be declared and should comply with BS 146 and BS 6588 respectively (see note 1). NOTE 1There is little practical experience of the abrasion resistance of concrete made with Portland pulverized-fuel ash cement and Portland-blastfurna
38、ce cement or with combinations of these materials, and evidence of suitability should be sought from the manufacturers or suppliers before specifying these types of cement for a concrete wearing surface. Moreover, when using either of these cement types, adequate curing is even more important than w
39、ith ordinary Portland cement. NOTE 2High alumina cement should not be used in concrete for structural purposes. 4.2 Aggregates 4.2.1 Aggregates for direct finished concrete surfaces. The aggregate should be one of the following as appropriate: a) aggregate complying with BS 882; b) coarse aggregates
40、 of blastfurnace slag complying with BS 1047; c) coarse and fine aggregates of other types for which there is no British Standard, provided that they are suitable having regard to strength, density, shrinkage and durability of the concrete. “All-in” aggregate should not be used. A crushed rock fine
41、aggregate is not recommended unless it is in accordance with the gradings specified in BS 882. 4.2.2 Aggregates for high strength concrete toppings 4.2.2.1 Coarse aggregates. Coarse aggregates for high strength concrete toppings should comply with BS 882. 4.2.2.2 Fine aggregates. The fine aggregate
42、should be natural sand, (i.e. fine aggregate resulting from the natural disintegration of rock) complying with grading limit C or M of Table 5 of BS 882:1983. NOTEThe use of grading C fine aggregate will produce a less workable mix than that obtained with a grading M fine aggregate. Grading M is the
43、refore preferred. 4.2.3 Deleterious materials. Aggregates should not contain any deleterious material in sufficient quantity to affect adversely the surface of a directly finished base or topping. For example, coal and iron pyrites in the aggregate can cause surface “pop-outs”. 4.3 Pigments Pigments
44、 should comply with BS 1014. 4.4 Admixtures Admixtures should comply with the appropriate Part of BS 5075 (see 5.5). 4.5 Surface treatments There are no British Standards for surface treatments. Recommendations for the use of proprietary materials are given in 5.6. 4.6 Abrasives and sprinkle finish
45、aggregates There are no British Standards for these materials. Recommendations for the use of proprietary materials are given in 5.7. Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 05:33:08 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 8204-2:1987 BSI 01-19993
46、Figure 1 Illustration of layers in a concrete ground-supported floor Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 05:33:08 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 8204-2:1987 4 BSI 01-1999 Figure 2 Illustration of layers in a suspended concrete floor Li
47、censed Copy: London South Bank University, London South Bank University, Fri Dec 08 05:33:08 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 8204-2:1987 BSI 01-19995 5 Design considerations: General 5.1 Sub-base A sub-base should be provided to give uniform support to ground-supported base slabs and t
48、he flooring applied to them. The sub-base should consist of inert well-graded granular material of maximum size 75 mm, fully compacted and lightly blinded with sand or inert, crushed, fine material, to form a flat surface to within a tolerance of + 0 mm, 25 mm. Alternatively, lean mix concrete with
49、mix proportions of 1 : 15 to 1 : 20 cement to total aggregate by mass should be used. 5.2 Methods of construction 5.2.1 General. Concrete wearing surfaces are of two forms as follows: a) Direct finished base slab. Either a plain direct finished base slab may be used or its wearing quality can be upgraded from that provided by a basic structural grade concrete by the incorporation of a sprinkle finish of a mixture of special aggregates and cement in the slab surface during the float finishing process (see 7.7). b) High strength concrete topping1) One o
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