BS 8204-1:2002
$167.15
Screeds, bases and in-situ floorings – Concrete bases and cement sand levelling screeds to receive floorings. Code of practice
| Published By | Publication Date | Number of Pages |
| BSI | 2002 | 42 |
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 1 | BRITISH STANDARD |
| 2 | Committees responsible for this British Standard |
| 3 | Contents |
| 5 | 1 Scope 2 Normative references |
| 6 | 3 Terms and definitions 3.1 base 3.2 flooring 3.3 direct finished base slab 3.4 screed material |
| 7 | Figure 1 Illustration of layers in a ground-supported concrete floor |
| 8 | Figure 2 Illustration of layers in a suspended concrete floor |
| 9 | 3.5 screed 3.6 levelling screed 3.7 wearing screed 3.8 bonded screed 3.9 unbonded screed 3.10 floating screed 3.11 fine concrete screed 3.12 cement sand screed 3.13 smoothing compound 3.14 departure from datum 3.15 surface regularity 3.16 in situ crushing resistance (ISCR) 3.17 no-fines concrete basecoat |
| 10 | 3.18 cement sand topping 3.19 combinations 4 Exchange of information and time schedule 4.1 General 4.2 Exchange of information |
| 11 | 4.3 Time schedule 5 Materials 5.1 Cement |
| 12 | 5.2 Additions |
| 13 | 5.3 Aggregates Table 1 Grading limits of sand for levelling screeds |
| 14 | 5.4 Admixtures Table 2 Admixtures 5.5 Ready mixed levelling screeds 5.6 Reinforcement 5.7 Water 6 Design considerations 6.1 Sub-base |
| 15 | 6.2 Base and screed construction 6.3 Base slabs Table 3 Concrete strength for base slabs |
| 16 | 6.4 Cement sand and fine concrete levelling screeds Table 4 Choice of in situ crushing resistance category for levelling screeds |
| 17 | Table 5 Acceptance limits for in situ crushing resistance test (after�dropping�the�weight�four�times) |
| 19 | 6.5 Bay sizes and position of joints |
| 20 | Table 6 Classification of surface regularity of direct finished base slab or levelling screed 6.6 Joint construction |
| 21 | 6.7 In situ crushing resistance (soundness) 6.8 Tolerances on level and surface regularity of base slabs and levelling screeds |
| 23 | 6.9 Liability to cracking of direct finished base slabs and levelling screeds |
| 24 | 6.10 Damp-proofing ground-supported floors 6.11 Eliminating construction moisture |
| 25 | 6.12 Use of admixtures 7 Work on site 7.1 Protection against the weather |
| 26 | 7.2 Use of calcium aluminate cement (high alumina cement) 7.3 Installation of the base |
| 28 | 7.4 Preparation of the base to receive screeds 7.5 Installation of the screed |
| 29 | 7.6 Pumping the screed material |
| 30 | 7.7 Laying the levelling screed 7.8 Finishing the levelling screed 7.9 Curing the levelling screed 7.10 Protection of the surface |
| 31 | 8 Inspection and testing of bases and levelling screeds 8.1 Inspection 8.2 Inspection and testing of the completed work 8.3 Levels and surface regularity 8.4 Adhesion of bonded levelling screeds to the base |
| 32 | 8.5 Curling and lipping of unbonded and floating levelling screeds 8.6 In�situ crushing resistance (ISCR) of bonded and unbonded levelling screeds 8.7 In�situ crushing resistance of floating levelling screeds 8.8 Assessment of cracks 8.9 Determination of mix proportions of a failed or suspect levelling screed |
| 33 | Annex A (informative) Recommendations for the use of lightweight aggregates in concrete bases and levelli… A.1 Aggregates A.2 Base and levelling screed construction A.3 Direct finished base slabs A.4 Bonding A.5 Thickness A.6 Location of services |
| 34 | A.7 Heated levelling screeds A.8 Bay sizes A.9 In situ crushing resistance A.10 Screed mix proportions, batching and mixing A.11 Method of mixing A.12 Pumping the screed material A.13 Laying the levelling screed |
| 35 | Annex B (normative) Methods for the assessment of levels and surface regularity Figure B.1 Stainless steel slip gauges for checking surface regularity |
| 36 | Annex C (normative) Method for the determination of in situ crushing resistance�of�bonded and unbonded le… C.1 Principle C.2 Apparatus C.3 Sampling C.4 Procedure C.5 Expression of results |
| 37 | Figure C.1 BRE screed tester |
| 38 | Annex D (normative) Determination of in situ crushing resistance of floating levelling�screeds D.1 Principle D.2 Apparatus D.3 Sampling D.4 Procedure D.5 Results |
| 39 | Annex E (normative) Curing recommendations for different cement types |
