《BS-8204-3-2004.pdf》由会员分享，可在线阅读，更多相关《BS-8204-3-2004.pdf（30页珍藏版）》请在三一文库上搜索。
1、BRITISH STANDARD BS 8204-3:2004 Screeds, bases and in situ floorings Part 3: Polymer modified cementitious levelling screeds and wearing screeds Code of practice ICS 91.060.30 ? Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 06:01:45 GMT+00:00 2006, Uncontrolle
2、d Copy, (c) BSI BS 8204-3:2004 This British Standard was published under the authority of the Standards Policy and Strategy Committee on 20 September 2004 BSI 20 September 2004 First published August 1993 Second edition September 2004 The following BSI references relate to the work on this British S
3、tandard: Committee reference B/507/6 Draft for comment 04/30055996 DC ISBN 0 580 44351 5 Committees responsible for this British Standard The preparation of this British Standard was entrusted by Technical Committee B/507, Paving units, kerbs, screeds and in situ floorings, to Subcommittee B/507/6,
4、Screeds and in situ floorings, upon which the following bodies were represented: Association of Concrete Industrial Flooring Contractors Association of Lightweight Aggregate Manufacturers British Cement Association Concrete Society Contract Flooring Association Federation of Plastering and Drywall C
5、ontractors Federation of Resin Flooring Formulators and Applicators Mastic Asphalt Council Mortar Producers Association Limited National Federation of Terrazzo-Marble and Mosaic Specialists National Specialist Contractors Council Quarry Products Association Society of Chemical Industry Co-opted memb
6、ers Amendments issued since publication Amd. No.DateComments Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 06:01:45 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 8204-3:2004 BSI 20 September 2004 i Contents Page Committees responsibleInside front cover Forewor
7、dii 1Scope1 2Normative references1 3Terms and definitions2 4Exchange of information and time schedule3 5Materials5 6Design7 7Preparation of concrete bases and fine concrete screeds17 8Work on site18 9Health and safety precautions22 10Inspection and testing of the screed22 11Maintenance24 Bibliograph
8、y25 Figure 1 Typical skirting detail16 Table 1 Classes of wearing screeds and levelling screeds8 Table 2 Typical mix proportions for polymer modified cementitious wearing and levelling screeds10 Table 3 Classification of abrasion resistance and limiting depths of wear for the abrasion test11 Table 4
9、 Examples of bonding agents for use on concrete bases13 Table 5 Classification of surface regularity for wearing surfaces and levelling screeds14 Table 6 Surface regularity of bases and fine concrete screeds to receive polymer modified cementitious screeds18 Licensed Copy: London South Bank Universi
10、ty, London South Bank University, Fri Dec 08 06:01:45 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 8204-3:2004 ii BSI 20 September 2004 Foreword This part of BS 8204 has been prepared by Subcommittee B/507/6. It supersedes BS 8204-3:1993, which is withdrawn. The main changes from the 1993 version a
11、re: a) the inclusion of levelling screeds to receive flooring; b) the specifications for materials have been updated to include the European Standard specifications for cement, aggregates and concrete; c) the introduction of classes of abrasion resistance for wearing screeds; d) the length of the st
12、raightedge, used in the determination of surface regularity, has been changed from 3 m to 2 m. This brings BS 8204 in line with BS 5385; e) guidance on formulated products has been added in accordance with BS EN 13813. Concrete wearing surfaces give satisfactory service under many industrial conditi
13、ons but become less effective where there are specific requirements for hygiene, cleanliness, and resistance to high impact or abrasion. The main properties of polymer modified cementitious screeds can be summarized as follows: a) enhanced adhesion to the concrete base; b) much thinner applications
14、than are possible with unmodified systems; c) toughness, durability, resilience and resistance to impact, abrasion and dusting; d) resistance to cracking; e) low permeability and reduced absorption of liquids and greases. The term “sand” is used throughout this document as this is the common termino
15、logy in the UK screeding industry although recent European Standards use the term “fine aggregate”. The other parts of BS 8204 are as follows: Part 1:2003, Concrete bases and cement sand levelling screeds to receive floorings Code of practice; Part 2:2003, Concrete wearing surfaces Code of practice;
16、 Part 4:2004, Code of practice for terrazzo wearing surfaces; Part 5:2004, Mastic asphalt underlays and wearing surfaces Code of practice; Part 6:2001, Synthetic resin floorings Code of practice; Part 7:2003, Pumpable self-smoothing screeds Code of practice. As a code of practice, this British Stand
17、ard takes the form of guidance and recommendations. It should not be quoted as if it were a specification and particular care should be taken to ensure that claims of compliance are not misleading. This publication does not purport to include all the necessary provisions of a contract. Users are res
18、ponsible for its 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 25 and a back cover. The BSI copyright notice displayed in thi
19、s document indicates when the document was last issued. Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 06:01:45 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 8204-3:2004 BSI 20 September 2004 1 1 Scope This part of BS 8204 gives recommendations for the design a
20、nd installation of trowel finished polymer modified cementitious levelling screeds and wearing screeds, where the proportion of polymer solids based on the mass of dry cement is at least 4 %, as bonded screeds applied to direct finished concrete slabs, fine concrete screeds and to existing concrete
21、floors within buildings. This British Standard does not apply to unbonded screeds, floating screeds, pumpable self-smoothing screeds, or those laid monolithically, neither does it apply to two-component aqueous thermosetting polymer dispersions. 2 Normative references The following referenced docume
22、nts are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. BS 915-2:1972, Specification for high alumina cement Part 2: Metric units. BS 13
23、69-1:1987, Steel lathing for internal plastering and external rendering Part 1: Specification for expanded metal and ribbed lathing. BS 4027:1996, Specification for sulfate-resisting Portland cement. BS 6100-6.1:1984, Glossary of building and civil engineering terms Part 6: Concrete and plaster Sect
24、ion 6.1: Binders. BS 6100-6.2:1986, Glossary of building and civil engineering terms Part 6: Concrete and plaster Section 6.2: Concrete. BS 6100-6.3:1984, Glossary of building and civil engineering terms Part 6: Concrete and plaster Section 6.3: Aggregates. BS 6100-6.4:1986, Glossary of building and
25、 civil engineering terms Part 6: Concrete and plaster Section 6.4: Admixtures. BS 7976-2, Pendulum testers Part 2: Method of operation. BS 8204-1:2003, Screeds, bases and in situ floorings Part 1: Concrete bases and cement sand levelling screeds to receive in situ floorings Code of practice. BS 8500
26、-2:2002, Concrete Complementary British Standard to BS EN 206-1 Part 2: Specification for constituent materials and concrete. BS EN 197-1:2000, Cement Part 1: Composition, specifications and conformity criteria for common cements. BS EN 934-2, Admixtures for concrete, mortar and grout Part 2: Concre
27、te admixtures Definitions, requirements, conformity, marking and labelling. BS EN 1008, Mixing water for concrete Specification for sampling, testing and assessing the suitability of water, including water recovered from processes in the concrete industry, as mixing water for concrete. BS EN 12504-2
28、, Testing concrete in structures Part 2: Non-destructive testing Determination of rebound number. BS EN 12620:2002, Aggregates for concrete. BS EN 12878, Pigments for the colouring of building materials based on cement and/or lime Specifications and methods of test. BS EN 13043:2002, Aggregates for
29、bituminous mixtures and surface treatments for roads, airfields and other trafficked areas. BS EN 13139:2002, Aggregates for mortar. BS EN 13318:2000, Screed material and floor screeds Definitions. BS EN 13813:2002, Screed material and floor screeds Screed material Properties and requirements. BS EN
30、 13892-4:2002, Methods of test for screed materials Part 4: Determination of wear resistance-BCA. Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 06:01:45 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 8204-3:2004 2 BSI 20 September 2004 BS EN 13892-8:2002, Metho
31、ds of test for screed materials Part 8: Determination of bond strength. THE CONCRETE SOCIETY. Technical Report 34 (TR 34), Concrete industrial ground floors: A guide to their design and construction. 3rd edition. Camberley: The Concrete Society, 20031). 3 Terms and definitions For the purposes of th
32、is part of BS 8204, the terms and definitions given in BS EN 13318:2000, BS 6100-6.1:1984, BS 6100-6.2:1986, BS 6100-6.3:1984 and BS 6100-6.4:1986 and the following apply. 3.1 base building element that provides the support for a screed and floor finishes 3.2 flooring uppermost fixed layer of a floo
33、r that is designed to provide a wearing surface 3.3 direct finished base slab concrete flooring element that is suitably finished to provide a wearing surface or to receive directly the flooring to be applied without the need for a levelling screed 3.4 screed material mixture comprising cement, aggr
34、egates, water and, in some cases, admixtures and/or additives 3.5 screed layer of material laid in situ, directly onto a base, bonded or unbonded, or onto an intermediate layer or insulation layer, for one or more of the following purposes: to obtain a defined level; to carry the final flooring; to
35、provide a wearing surface. NOTEIn this document the term “screed” includes both levelling screeds and wearing screeds unless otherwise stated. 3.6 levelling screed screed suitably finished to obtain a defined level and to receive the final flooring 3.7 wearing screed screed that serves as a flooring
36、 NOTEThis was formerly known as high strength concrete topping or granolithic topping. 3.8 bonded screed screed that is bonded to the base 3.9 unbonded screed screed laid either onto a separating layer or onto a base not prepared to ensure bonding 3.10 floating screed screed laid on an acoustic and/
37、or thermal insulating layer and completely separated from other building elements, such as walls and pipes 1)Available from Concrete Information Ltd., Riverside House, Station Approach, Camberley, Surrey, GU17 9AB. Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08
38、 06:01:45 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 8204-3:2004 BSI 20 September 2004 3 3.11 fine concrete screed screed consisting of concrete in which the maximum aggregate size is 10 mm 3.12 cement sand screed screed consisting of screed material containing sand up to a 4 mm maximum aggregate
39、 size 3.13 smoothing compound material applied to a base or screed to provide a smooth, even surface suitable for the installation of a floor covering 3.14 departure from datum deviation in height of the surface of a flooring layer from a fixed datum plane 3.15 surface regularity deviation in height
40、 of the surface of a flooring layer over short distances in a local area NOTESurface regularity is also known as flatness. 3.16 polymer modified cementitious screed material mixture of cement, aggregates and water, modified with a polymer dispersion or re-dispersible powder polymer, where the propor
41、tion of polymer solids based on the mass of dry cement is at least 4 % 3.17 bonding agent liquid product applied to seal and consolidate the surface of a base and aid the adhesion of the screed 3.18 pot life period of time after mixing during which a bonding agent can be worked 3.19 open time period
42、 of time after a bonding agent has been applied to a concrete surface during which it will provide full adhesion for a screed applied over it 4 Exchange of information and time schedule 4.1 General It is essential that consultations and exchange of information between all parties concerned with the
43、building operations are arranged at an early date. This will enable each party to have full knowledge of the particulars of the work so that they can cooperate in producing the conditions required to complete a satisfactory job. 4.2 Selection of screed to be applied It is essential that in the desig
44、n stage there is full consultation with the manufacturer or supplier of the polymer modified system to ensure that the system selected is suitable for the application and service conditions. Consideration should therefore be given to whichever of the following are applicable: a) the intended use of
45、the floor, including the type, extent and frequency of trafficking, impact forces, static loading etc.; b) whether in use the area will be dry or damp; c) type of flooring to be applied, if any; d) thickness of screed required, and any thickness variation to provide a fall; e) time available for the
46、 application, curing and drying of the screed; f) category of screed and in situ crushing resistance required; Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 06:01:45 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 8204-3:2004 4 BSI 20 September 2004 g) class of
47、abrasion resistance required (wearing screeds only); h) any requirement for slip resistance (wearing screeds only); i) age, specification where known and nature of the base, including information about any previous use which might impair adhesion; j) the existence, or otherwise of a damp-proof membr
48、ane; k) surface preparation necessary; l) chemical resistance required: chemical constituents, concentration, temperature and frequency of likely spillage, presence of water and procedures for emergency wash-down, details of regular cleaning procedures, also falls, drainage and sumps to be provided.
49、 4.3 Information to be provided to the screeding contractor It is essential that all relevant information be provided in good time to the screeding contractor and to others whose work could be affected, including whichever of the following are applicable: a) description, situation and address of site and means of access to the site and