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1、BRITISH STANDARD BS 8204-4: 1993 In-situ floorings Part 4: Code of practice for terrazzo wearing surfaces UDC 693.73:692.53 Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 05:40:05 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 8204-4:1993 This British Standard,
2、having been prepared under the direction of Technical Committee B/544, was published under the authority of the Standards Board and comes into effect on 15 October 1993 BSI 02-1999 The following BSI references relate to the work on this standard: Committee reference B/544/6 Draft for comment 92/1692
3、2 DC ISBN 0 580 22452 X Committees responsible for this British Standard The preparation of this British Standard was entrusted by Technical Committee B/544 Plastering, rendering, dry lining, screeds and in-situ flooring, to Subcommittee B/544/6 Screeds and in-situ floorings, upon which the followin
4、g bodies were represented: Association of Lightweight Aggregate Manufacturers British Aggregate Construction Materials Industries British Resin Manufacturers Association Building Employers Confederation Chartered Institute of Building Concrete Society Contract Flooring Association Department of the
5、Environment (Building Research Establishment) Department of the Environment (Property Services Agency) Federation of Associations of Specialists and Subcontractors Federation of Plastering and Drywall Contractors Federation of Resin Formulators and Applicators (FeRFA) Mastic Asphalt Council and Empl
6、oyers Federation Mortar Producers Association Limited National Federation of Terrazzo-Marble and Mosaic Specialists Scottish Master Plasterers Association Society of Chemical Industry Amendments issued since publication Amd. No.DateComments Licensed Copy: London South Bank University, London South B
7、ank University, Fri Dec 08 05:40:05 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 8204-4:1993 BSI 02-1999i Contents Page Committees responsibleInside front cover Forewordiii 1Scope1 2Normative references1 3Definitions1 4Exchange of information and time schedule1 4.1General1 4.2Exchange of informatio
8、n1 4.3Time schedule2 5Materials2 5.1Cement2 5.2Aggregates2 5.3Pigments2 5.4Admixtures2 5.5Additional materials2 5.6Water3 5.7Reinforcement3 5.8Dividing strips3 6Design considerations3 6.1Concrete bases to receive flooring3 6.2 Screeds3 6.3 Preparation of concrete base and screed3 6.4Backing for terr
9、azzo skirtings, risers, treads and strings3 6.5Methods to minimize cracks in the terrazzo flooring3 6.6Size of terrazzo aggregate4 6.7Terrazzo mix proportions4 6.8Terrazzo thicknesses4 6.9Tolerances on level and surface regularity4 6.10 Slip resistance4 6.11 Conductive flooring4 6.12 Movement joints
10、5 7Work on site5 7.1Workmanship5 7.2Protection against the weather5 7.3Preparation of the concrete base5 7.4Screed mix6 7.5Pumping the screed6 7.6Laying the screed6 7.7Dividing strips6 7.8Curing the screed6 7.9Terrazzo mix proportions6 7.10 Batching and mixing terrazzo7 7.11 Laying the terrazzo floo
11、ring7 7.12 Surfaces other than floors7 7.13 Curing the terrazzo flooring7 7.14 Surface grinding7 7.15 Curing after final machining8 7.16 Protection8 Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 05:40:05 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 8204-4:199
12、3 ii BSI 02-1999 Page 8Inspection and testing of flooring8 9Cleaning and maintenance9 Annex A (normative) Method for the assessment of levels and surface regularity10 Annex B (normative) Determination of slip resistance value (SRV)10 Figure A.1 Slip gauges for checking surface regularity10 Figure B.
13、1 Friction tester11 Table 1 Mechanical properties of terrazzo aggregates2 Table B.1 Properties of the friction tester slider (soft rubber)13 Table B.2 Temperature corrections for SRV readings using soft rubber slider13 List of referencesInside back cover Licensed Copy: London South Bank University,
14、London South Bank University, Fri Dec 08 05:40:05 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 8204-4:1993 BSI 02-1999iii Foreword This Part of BS 8204 has been prepared under the direction of Technical Committee B/544 Plastering, rendering, dry lining, screeds and in-situ flooring. It gives recomm
15、endations for terrazzo floorings laid in-situ on a cement and sand screed applied to a concrete slab and finished by grinding and polishing the surface. Annex A and Annex B give relevant test methods. If terrazzo flooring is laid well and ground to a fine grit finish, it provides a hard, durable sur
16、face which is easy to clean and not inherently slippery. In addition, it is mainly unaffected by water. BS 8204-4 is one of a series dealing with in-situ floorings; the other Parts of BS 8204 are as follows. Part 1:1987, Code of practice for concrete bases and screeds to receive in-situ floorings. P
17、art 2:1987, Code of practice for concrete wearing surfaces. Part 3:1993, Code of practice for polymer modified cementitious wearing surfaces. Part 51): Code of practice for mastic asphalt underlays and wearing surfaces. An additional Part of BS 8204 dealing with cold-setting resin wearing surfaces i
18、s to be prepared. BS 8204-4 supersedes section 3 of CP 204-2:1970, which will be withdrawn when BS 8204-5 is published. As a code of practice, this British Standard takes the form of guidance and recommendations. It should not be quoted as if it were a specification and particular care should be tak
19、en to ensure that claims of compliance are not misleading. 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 l
20、egal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i to iv, pages 1 to 14, 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
21、table on the inside front cover. 1) In preparation. Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 05:40:05 GMT+00:00 2006, Uncontrolled Copy, (c) BSI iv blank Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 05:40:05 GMT+00
22、:00 2006, Uncontrolled Copy, (c) BSI BS 8204-4:1993 BSI 02-19991 1 Scope This Part of BS 8204 gives recommendations for the materials, design and work on site for in-situ cementitious terrazzo flooring, and should be read in conjunction with BS 8204-1:1987. 2 Normative references This Part of BS 820
23、4 incorporates, by reference, provisions from specific editions of other publications. These normative references are cited at the appropriate points in the text and the publications are listed on the inside back cover. Subsequent amendments to, or revisions of, any of these publications apply to th
24、is Part of BS 8204 only when incorporated in it by updating or revision. 3 Definitions For the purposes of this Part of BS 8204, the definitions given in BS 6100-6.1:1984, BS 6100-6.2:1986, BS 6100-6.3:1984 and BS 6100-6.4:1986 apply, together with the following. 3.1 floor base material that support
25、s a screed or flooring 3.2 flooring uppermost fixed layer of a floor that is designed to provide a wearing surface 3.3 screed layer of well-compacted material, commonly a mixture of cement and sand, applied in-situ to a base at the appropriate thickness, suitably finished to receive the flooring to
26、be applied and to enable the flooring to be laid to a designated level 3.4 terrazzo mixture of marble or other natural stone aggregates with Portland cement, incorporating colouring pigments where required, which is ground after setting to expose the aggregate and provide a smooth hard-wearing finis
27、h 4 Exchange of information and time schedule NOTEThis clause deals with the exchange of information and time schedule for the whole floor, including bases and screeds. 4.1 General Consultations and exchange of information between all parties concerned with the building operations should be arranged
28、 at an early date, so that each 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. 4.2 Exchange of information The designer should provide in good time all relevant information to those re
29、sponsible for laying the flooring 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; b) those conditions of contract which could practically affect this particular work; c) location and a
30、rea of flooring to be laid; d) age and nature of the base, including information about the previous use of the floor which could impair adhesion, and any preparatory treatment required; e) specification including mix proportions of flooring to be laid; f) thickness of floor and flooring; g) finished
31、 floor level, surface regularity falls and maximum permissible departure from datum; h) class of surface regularity of base (see BS 8204-1:1987); i) type of damp-proofing and insulation; j) type (bonded or unbonded) and thickness of new screed; k) any work consequent upon services passing through th
32、e floor; l) treatment of joints; m) treatment of channels; n) treatment of skirtings; o) treatment of junctions with adjacent floor and floorings; p) type of finish of base; q) any special requirements related to underfloor heating; r) minimum intervals between stages of work and the application of
33、heat in the building; s) date for the completion of the base to receive the terrazzo; t) dates for the start and completion of various sections of the floor; u) details of any conformity testing required. Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 05:40:05
34、GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 8204-4:1993 2 BSI 02-1999 4.3 Time schedule In considering the schedule, in addition to the usual intervals between commencement and completion of work by the various trades involved, additional allowances should be made for the following: a) curing and
35、drying of the base concrete before the screed and flooring is laid, where applicable; b) period of protection of the completed floor from damage by other trades, including restriction of access. 5 Materials 5.1 Cement The cement should be grey or white Portland cement conforming to class 42.5N in BS
36、 12:1991. 5.2 Aggregates 5.2.1 Aggregates for fine concrete screeds Aggregates for fine concrete screeds should be composed of 10 mm single-sized coarse aggregate in accordance with Table 3 of BS 882:1992 and of sand in accordance with 5.2.2 of this standard. 5.2.2 Sand for cement: sand screeds Sand
37、s for cement and sand screeds should conform to grading limit C or M of Table 4 of BS 882:1992 but with not more than 10 % passing sieve size 150 4m and with an additional requirement of not more than 3 % passing sieve size 75 4m. 5.2.3 Aggregates for terrazzo flooring Aggregates for terrazzo wearin
38、g surfaces should be crushed marble and should be angular as distinct from elongated and flaky and free from fines and dust. Aggregates should be washed single-sized between 3 mm and 25 mm and could be used individually or mixed, depending on the decorative effect required. The mechanical properties
39、 of terrazzo aggregates should be within the ranges given in Table 1. Table 1 Mechanical properties of terrazzo aggregates 5.2.4 Deleterious material Aggregates should not contain any deleterious material in sufficient quantity to affect adversely the surface finish. For example, coal, lignite and i
40、ron pyrites in the aggregate can cause “pop-outs”. 5.3 Pigments Colouring agents should conform to BS 1014:1992; other pigments may be used by agreement between the parties concerned, however, those not covered by BS 1014 could be subject to fading. 5.4 Admixtures The following admixtures may be use
41、d. a) Air-entraining. Air-entraining admixtures should conform to BS 5075-2:1982. Admixtures which entrain a small amount of fine air bubbles could help to reduce “bleeding” of free water and improve the finished surface of the concrete base or screed. An excessive amount of entrained air can reduce
42、 the strength of the concrete to an unacceptable degree. b) Water reducing. Water reducing admixtures should conform to BS 5075-1:1982. These admixtures may be used to improve workability and reduce the water content otherwise required in the mix. They may also entrain a small quantity of air. c) Su
43、perplasticizing. Superplasticizing admixtures should conform to BS 5075-3:1985. These admixtures greatly increase workability at normal water contents for a short period to produce “flowing concrete” which needs little or no compaction. Alternatively they may be used as water reducing admixtures. d)
44、 Accelerating. Accelerating admixtures should conform to BS 5075-1:1982. These admixtures may be used to accelerate the rate of setting and hardening of concrete in cold weather. Admixtures which contain calcium chloride should not be used in, or in materials adjacent to, reinforced concrete or conc
45、rete or screed containing embedded metal. e) Retarding. Retarding admixtures should conform to BS 5075-1:1982. These admixtures decrease the initial rate of reaction between cement and water and thereby retard the setting of the concrete. 5.5 Additional materials Additional materials may be used, bo
46、th in the screed and terrazzo flooring, by agreement between the relevant parties, provided evidence of satisfactory performances is available. These include materials such as polymer dispersions, microsilica fume, pulverized-fuel ash and ground granulated blastfurnace slag. PropertyRange % Referenc
47、e Aggregate crushing value (ACV) Aggregate impact value (AIV) Aggregate abrasion value (AAV) 15 to 30 15 to 35 7 to 15 BS 812-110:1990 BS 812-112:1990 BS 812-113:1990 Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 05:40:05 GMT+00:00 2006, Uncontrolled Copy, (c)
48、 BSI BS 8204-4:1993 BSI 02-19993 5.6 Water Water should be fresh, clean and drinkable. 5.7 Reinforcement Where light reinforcement is required in a screed it should consist of steel fabric, reference D49 or D98 in accordance with BS 4483:1985. 5.8 Dividing strips Dividing strips should be made of br
49、ass, aluminium alloy or plastics and should incorporate a mechanical key for fixing into the screed. 6 Design considerations 6.1 Concrete bases to receive flooring Concrete bases should be designed and constructed following the recommendations contained in BS 8204-1:1987. Any damp-proof membrane and/or thermal insulation required should be placed below the concrete base slab. The surface should be provided with a float finish with a surface regularity of class SR3 as given in Table 2 of BS 8204-1:1987. Any falls required should be formed in the base. 6.2 Scr