BS 6515-1984 Specification for polyethylene damp-proof courses for masonry《砖石砌筑用聚乙烯防潮层规范》.pdf

1、BRITISH STANDARD BS6515:1984 Incorporating Amendment No.1 Specification for Polyethylene damp-proof courses for masonry UDC699.822:678.742.2BS6515:1984 This British Standard, having been prepared under the directionof the Elements and Components (of Diverse Materials)for Buildings Standards Committe

2、e, was published under the authority ofthe Board of BSI and comes intoeffect on 28 September1984 BSI 07-1999 The following BSI references relate to the work on this standard: Committee reference ECB/44 Draft for comment81/10439 DC ISBN 0 580 13966 2 Committees responsible for this British Standard T

3、he preparation of this British Standard was entrusted by the Elements and Components (of Diverse Materials) for Buildings Standards Committee (ECB/-) to Technical Committee ECB/44 upon which the following bodies were represented: Associated Lead Manufacturers Limited Association of British Roofing F

4、elt Manufacturers Association of Jute Spinners and Manufacturers Autoclaved Aerated Concrete Products Association Brick Development Association British Board of Agrment British Ceramic Research Association British Engineering Brick Association British Lead Manufacturers Association British Plastics

5、Federation Copper Development Association Department of the Environment (Building Research Establishment) Department of the Environment (Property Services Agency) Greater London Council Institute of Building Control Officers Institute of Clerks of Works of Great Britain Incorporated Mastic Asphalt C

6、ouncil and Employers Federation North Wales Slate Quarries Association Royal Institute of British Architects Royal Institution of Chartered Surveyors Society of Chemical Industry The following were also represented in the drafting of the standard, through subcommittees and panels: Coopted members Am

7、endments issued since publication Amd. No. Date of issue Comments 5444 October1986 Indicated by a sideline in the marginBS6515:1984 BSI 07-1999 i Contents Page Committees responsible Inside front cover Foreword ii 1 Scope 1 2 Definitions 1 3 Composition 1 4 Thickness 1 5 Finish and impermeability 1

8、6 Marking and packaging 1 Appendix A Method of determining mass of material other than polyethylene 2 Appendix B Method of measuring thickness 2 Appendix C Method for assessing impermeability 4 Appendix D Recommended uses for polyethylene damp-proof courses 5 Figure 1 Specimens for determination of

9、thickness 3 Figure 2 Viewing box for impermeability test 4 Table 1 Recommended uses for polyethylene damp-proof courses 5 Publications referred to 6BS6515:1984 ii BSI 07-1999 Foreword This British Standard has been prepared under the direction of the Elements and Components (of Diverse Materials) fo

10、r Buildings Standards Committee. This standard supersedes the requirements of clause6 of BS743:1970. The major change from the requirements specified in BS743 is the inclusion of methods for determining thickness and impermeability. The intention is to cover the different damp-proof course (d.p.c.)

11、materials in BS743 by publishing new British Standards or amending existing British Standards, after which BS743 will be withdrawn. Research is in progress to develop test methods as a basis for a future performance-based specification for damp-proof courses (see DD86). For guidance on the use of po

12、lyethylene damp-proof courses, see Appendix D. Further information is given in BS5628-1 and5628-3. Certification. Attention is drawn to the certification facilities described on the inside back cover of this standard. A British Standard does not purport to include all the necessary provisions of a c

13、ontract. 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, pagesi andii, pages1 to6, an inside back cov

14、er 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.BS6515:1984 BSI 07-1999 1 1 Scope This British Standard specifies requirements for the composition, thickness, fi

15、nish and impermeability of polyethylene damp-proof courses intended for use in masonry constructions. NOTEThe titles of the publications referred to in this standard are listed on page 6. 2 Definitions For the purposes of this British Standard, the definitions given in BS6100-1.0 apply. 3 Compositio

16、n The damp-proof course (d.p.c.) shall consist of black low-density polyethylene sheet having a mass in the range0.425kg/m 2to0.60kg/m 2 , formed from a polyethylene polymer of a melt flow rate of five or less when measured according to BS2782:Method720A and having a density within the range0.915g/m

17、L to0.925g/mL at23 C when tested according to method620A,620B or620D of BS2782:Methods620A to620D:1980. When determined as described in Appendix A, the sheet shall contain a minimum of2% by mass of evenly dispersed carbon black and shall contain not more than5% by mass of material other than polyeth

18、ylene. 4 Thickness Nine specimens taken from a roll of d.p.c. material and measured as described in Appendix B shall have a single layer of thickness not less than0.46mm. 5 Finish and impermeability The sheet shall be free from air bubbles and, when tested as described in Appendix C, shall have no v

19、isible pin holes. NOTEA surface texture is permitted. 6 Marking and packaging The finished d.p.c. shall be packed in rolls, each roll containing not less than8m in length. Each roll shall be labelled legibly with the number and date of this British Standard, i.e. BS6515:1984 1) . 1) Marking BS6515:1

20、984 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 a claim is therefore solely the manufacturers responsibility. Enquiries as to the availability of third party certificati

21、on to support such claims should be addressed to the Director, Quality Assurance Division, BSI, Maylands Avenue, Hemel Hempstead, Herts HP24SQ for certification marks administered by BSI or to the appropriate authority for other certification marks.BS6515:1984 2 BSI 07-1999 Appendix A Method of dete

22、rmining mass of material other than polyethylene A.1 Procedure Determine the mass of material other than polyethylene using the procedure described in clauses3, 4 and5 of BS2782:Method452B:1978. A.2 Calculation and expression of results A.2.1 Calculate the percentage by mass of material other than p

23、olyethylene using the following formula: A.2.2 Calculate the carbon black content as a percentage by mass using the following formula: Appendix B Method of measuring thickness B.1 Principle The thickness of nine specimens taken from a1m long sample of the d.p.c. is measured using either a stage micr

24、ometer or an eyepiece micrometer. B.2 Apparatus B.2.1 Microscope, of at least 40 magnification, equipped with measuring devices capable of making measurements to an accuracy of0.01mm. The microscope may be used either in conjunction with a stage micrometer(B.2.3) to make direct measurements (seeB.4.

25、2), or may incorporate a ruled glass disc or an eyepiece micrometer with a scale divided into100 equal units (seeB.4.3). B.2.2 Microscope lamp, or other means of illuminating the specimen under test. The illumination shall be as nearly vertical to the specimen as possible. B.2.3 Glass stage micromet

26、er, for calibrating the eyepiece, or for placing over the sample to measure the thickness directly. If used to measure the sample, the graduations shall be in contact with the specimen. B.2.4 Vice, or other apparatus for holding the specimen under the microscope, with just sufficient clamping pressu

27、re to hold the specimen steady without distorting it. B.2.5 Sharp cutting tool, e.g.a razor blade in a holder. B.2.6 Cutting board, of hardwood or other suitable cutting surface. B.3 Preparation of specimens Place a1m long sample of the d.p.c. on the cutting board. Cut specimens as shown in Figure 1

28、 as follows. Hold the cutting instrument firmly, perpendicular to the long axis of the specimen, and then apply sufficient pressure so that a clean straight cut at least50mm long is made completely through the sample in one stroke. Take care not to distort the sample or turn the knife from the perpe

29、ndicular. Make a similar cut parallel to the first cut10mm apart and then cut each end so that the specimen can be removed from the sample. B.4 Procedure B.4.1 General. Mount the specimen in the vice with the long edge up, so that the edge is exposed about6mm above the jaws of the vice. Measure the

30、thickness using a stage micrometer as described inB.4.2 or using an eyepiece micrometer as described inB.4.3. B.4.2 Measurement with stage micrometer. Locate the vice and specimen under the microscope, and place the stage micrometer on the cut surface of the specimen, with the ruled surface in conta

31、ct with the material. Adjust the illuminating source so that the light strikes the specimen as near to the vertical as possible. Focus the microscope to a sharp image. Read the thickness of the specimen in millimetres directly from the rulings on the stage micrometer, estimate to the nearest0.01mm a

32、nd record. B.4.3 Measurement using microscope with a ruled glass disc or eyepiece micrometer. Place the ruled glass disc or the eyepiece micrometer in the eyepiece and calibrate it by observing the stage micrometer. Then locate the vice and specimen under the microscope, adjust the illuminating sour

33、ce so that the light strikes the specimen as near to the vertical as possible and focus the microscope to a sharp image. Measure the thickness by counting the rulings or the divisions on the ruled glass disc in the eyepiece that cover the distance from one edge of the specimen to the other, and by a

34、pplying the appropriate calibration factor. where m 1 is the mass of the sample taken (in g); m 2 is the mass of residue after heating in the combustion tube (in g). where m 1 is the mass of the sample taken (in g); m 2 is the mass of the residue after heating in the combustion tube (in g); m 3 is t

35、he mass of the ash after heating in the muffle furnace (in g). m 2 m 1 -100 m 2 m 3 m 1 -100 BS6515:1984 BSI 07-1999 3 B.5 Expression of results Record the thickness of each specimen to the nearest0.01mm. Figure 1 Specimens for determination of thicknessBS6515:1984 4 BSI 07-1999 Appendix C Method fo

36、r assessing impermeability C.1 Apparatus C.1.1 Viewing box, of internal dimensions250mm 250mm 250mm with the internal surfaces painted white and illuminated by a25W lamp (see Figure 2). The top of the box shall have a central200mm 50mm slot with sides parallel to the corresponding edges of the box.

37、Guiding runners,250mm in length and parallel to the long dimension to the long dimension of the slot, shall be placed80mm apart, either side of the slot, with fixed strips acting as light shields by protruding over the guides towards the slot by13mm. The area between the guides shall be covered by c

38、lear glass. A hood, to reduce incident light when viewing the d.p.c. strip, shall be placed over the guide area, with slots at the sides to allow the d.p.c. test strip to pass through. A number of holes in the sides of the viewing box shall be made for cooling purposes. C.2 Preparation of test strip

39、s From a1m long sample of the d.p.c., cut75mm wide test strips along the full length of the sample. From sheet between75mm and150mm in width, cut one strip. From sheet between150mm and225mm in width, cut two strips. From sheets of width greater than225mm, take three strips, one from each edge and on

40、e from the centre of the sample. C.3 Procedure Pass each test strip through the guides and over the light source with the hood in position. Inspect the strip and record any visible pin holes. Figure 2 Viewing box for impermeability testBS6515:1984 BSI 07-1999 5 Appendix D Recommended uses for polyet

41、hylene damp-proof courses Table 1 gives guidance on the suitability of polyethylene damp-proof courses for various types of construction. Table 1 Recommended uses for polyethylene damp-proof courses Conditions within masonry Remarks Recommendation a) High compressive stress (2.50N/mm 2 ) e.g.buildin

42、gs higher than10 storeys Suitable b) Medium compressive stress (0.50N/mm 2to2.50N/mm 2 ) e.g.buildings from4 to10 storeys Suitable c) Low compressive stress (0.10 N/mm 2to2.50N/mm 2 ) e.g.buildings up to4 storeys Suitable d) Minimal compressives stress (0.10N/mm 2 ) with lateral load, e.g.copings, p

43、arapet walls Not suitable e) High shear stress, e.g.retainingwalls,etc. Not suitable f) High flexural stress, e.g.freestanding walls, parapets, etc. Not suitable g) Water movement upwards Upward movement of water is normally prevented just above ground level Generally suitable, but seee) and f) h) W

44、ater movement downwards Downward movement of water needs to be prevented at many levels, e.g.parapets, chimneys and above lintels in cavity walls Not suitable i) Water movement horizontally Horizontal movement of water needs to be prevented where the outer leaf of a cavity wall is returned to close

45、the cavity or where a d.p.c. in a wall and a d.p.c. in an abutting floor are at different levels SuitableBS6515:1984 BSI 07-1999 6 Publications referred to BS743, Materials for damp-proof courses 2) . BS2648, Performance requirements for electrically-heated laboratory drying ovens. BS2782, Methods o

46、f testing plastics. BS2782:Method 452B, Determination of carbon black content of polyolefin compound. BS2782:Methods 620A to 620D, Determination of density of solid plastics excluding cellular plastics (immersion method, pyknometer method, sink-float method, density gradient column method). BS2782:M

47、ethod 720A, Determination of melt flow rate of thermoplastics. BS5628, Code of practice for use of masonry 2) . BS5628-1, Structural use of unreinforced masonry. BS5628-3, Materials and components, design and workmanship. BS6100, Glossary of building and civil engineering terms. BS6100-1.0, General.

48、 CP121, Walling. DD86, Damp-proof courses 2) . DD86-1, Methods of test for flexural bond strength and short term shear strength. DD86-2, Method of test for creep deformation. 2) Referred to in the foreword only.BS6515:1984 BSI 07-1999 BSI certification marks A licence to use the Kitemark or “Safety

49、Mark” on or in relation to a product will be granted to any manufacturer or producer who demonstrates that he can and will be able consistently to make that product to the requirements specified in the British Standard product specification. His capability of doing so is initially established by assessment of his production process, quality control organization and test facilities against the required Part of BS5750 “Quality systems”, and by testing the product against all the criteria of the relevant standard. The lic