BS EN 1328-1997 Cement bonded particleboards - Determination of frost resistance《胶合刨花板 耐寒性测定》.pdf

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1、| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | BRITISH STANDARD BS EN 1328 : 1997 The Eur

2、opean Standard EN 1328 : 1996 has the status of a British Standard ICS 79.060.020 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW Cement bonded particleboards Determination of frost resistanceBS EN 1328 : 1997 This British Standard, having been prepared under the direction of

3、the Sector Board for Building and Civil Engineering, was published under the authority of the Standards Board and comes into effect on 15 April 1997 BSI 1997 The following BSI references relate to the work on this standard: Committee reference B/541 Draft for comment 94/101441 DC ISBN 0 580 27073 4

4、Amendments issued since publication Amd. No. Date Text affected Committees responsible for this British Standard The preparation of this British Standard was entrusted to Technical Committee B/541, Wood-based panels, upon which the following bodies were represented: APA/Engineered Wood Association A

5、ssociation of British Plywood and Veneer Manufacturers British Woodworking Federation Council of the Forest Industries of British Columbia Department of the Environment (Building Research Establishment) Finnish Plywood International Flat Roofing Contractors Advisory Board Forestry Commission Furnitu

6、re Industry Research Association Institution of Structural Engineers Local Authority Organizations Mineral Bonded Board Products Federation National Federation of Roofing Contractors National House-building Council National Panel Products Association Royal Institute of British Architects Structural

7、Board Association Timber Research and Development Association Timber Trade Federation Wood Panel Products Federation Zurich Municipal Building GuaranteeBS EN 1328 : 1997 BSI 1997 i Contents Page Committees responsible Inside front cover National foreword ii Foreword 2 Text of EN 1328 3ii BSI 1997 BS

8、 EN 1328 : 1997 National foreword This British Standard has been prepared by Technical Committee B/541 and is the English language version of EN 1328 : 1996 Cement bonded particleboard Determination of frost resistance published by the European Committee for Standardization (CEN). EN 1328 was produc

9、ed as a result of international discussions in which the United Kingdom took an active part. BS EN 1328 is one of a number of standards which together supersede BS 5669 : Part 4, which will be withdrawn in accordance with CEN Provisions within 6 months of completion of the package of standards cover

10、ing cement-bonded particleboards. These standards are: BS EN 310 BS EN 322 BS EN 323 BS EN 324-1 BS EN 324-2 BS EN 325 BS EN 633 BS EN 634-1 BS EN 634-2 BS EN 1128 BS EN 1328 Cross-references Publication referred to Corresponding British Standard EN 310 BS EN 310 : 1993 Wood-based panels. Determinat

11、ion of modulus of elasticity in bending and of bending strength EN 326-1 BS EN 326 Wood-based panels. Sampling, cutting and inspection Part 1 : 1994 Sampling and cutting of test pieces and expression of test results NOTE. Informative reference is also made to EN 633 and EN 634-1, and to EN 634-2, wh

12、ich is currently in preparation. 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, the EN title page, pages 2 to 6, an inside back cover and a back cover.CEN Eur

13、opean Committee for Standardization Comite Europe en de Normalisation Europa isches Komitee fu r Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels 1996 All rights of reproduction and communication in any form and by any means reserved in all countries to CEN and its members. Ref. No.

14、EN 1328 : 1996 E EUROPEAN STANDARD EN 1328 NORME EUROPE ENNE EUROPA ISCHE NORM August 1996 ICS 79.060.20 Descriptors: Particle boards, binders, materials, cements, tests, determination, freezethaw resistance English version Cement bonded particleboards Determination of frost resistance Panneaux de p

15、articules lie es au ciment De termination de la re sistance au gel Zementgebundene Spanplatten Bestimmung der Frostbesta ndigkeit This European Standard was approved by CEN on 1996-07-04. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giv

16、ing this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CEN member. This European Standard exists in three official vers

17、ions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium,

18、Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom.Page 2 EN 1328 : 1996 BSI 1997 Foreword This European Standard has been prepared by Technical Committee CEN/TC 112, Wood-based panels, the Secr

19、etariat of which is held by DIN. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by February 1997, and conflicting national standards shall be withdrawn at the latest by June 1997. According to the C

20、EN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland

21、and the United Kingdom. Contents Page Foreword 2 1 Scope 3 2 Normative references 3 3 Principle 3 4 Apparatus 3 5 Test pieces 3 6 Procedure 3 7 Expression of results 4 8 Test report 4 Annex A (informative) Bibliography 5Page 3 EN 1328 : 1996 BSI 1997 1 Scope This European Standard specifies a test m

22、ethod for the determination of frost resistance of cement bonded particleboards. 2 Normative references This European Standard incorporates, by dated or undated reference, provisions from other publications. These normative references are cited at the appropriate places in the text and the publicati

23、ons are listed hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to this European Standard only when incorporated in it by amendment or revision. For undated references, the latest edition of the publication referred to applies. EN 310 Wood-bas

24、ed panels Determination of modulus of elasticity in bending and of bending strength EN 326-1 Wood-based panels Sampling, cutting and inspection Part 1: Sampling and cutting of test pieces and expression of test results 3 Principle The frost resistance of the material under test is expressed as the r

25、atio of the bending strength of an untreated control specimen and a matched specimen which has been subjected to freezethaw cycles. 4 Apparatus 4.1 A freezer unit having forced air circulation capable of lowering the temperature to (218 2) C within 1 h to 2 h when containing the batch of test pieces

26、 to be tested. 4.2 A water bath capable of maintaining the contents at a temperature of (20 2) C and regaining this temperature in not more than 2 h after inserting a full load of frozen test pieces. NOTE. The dimensions of the bath will need to accommodate 48 test pieces up to 1050 mm long and sepa

27、rated from one another by the distance specified in 6.3. 4.3 A bending test machine fitted with bending apparatus as described in EN 310. 4.4 A measuring device capable of measuring temperature from230 C to +50 C with a graduation of 1 C. 4.5 A balance with an error limit of 0,01 %. 4.6 A climate ch

28、amber or cabinet capable of maintaining the air at a temperature of (20 2) C and the relative humidity at (65 5) %. 5 Test pieces 5.1 Dimensions Test pieces according to EN 310. 5.2 Sampling Take six pairs of side-matched test pieces from each of eight panels of a single thickness. All test pieces s

29、hall be taken with their long axes in the same direction of the panel and their position within the panel selected at random. Each individual pair shall be given the same number for later comparison of results. 6 Procedure 6.1 Divide the paired test pieces to form two batches of 48 test pieces each,

30、 the test pieces of the first batch are used as control test pieces. 6.2 Submit the first batch of test pieces to the bending test according to EN 310. 6.3 Immerse the second batch of test pieces in water at room temperature (20 2) C for 48 h, then subject this batch of test pieces to a sequence of

31、freezethaw cycles. Each immersion cycle shall be carried out in new water. Place the test pieces in the freezer at (218 2) C (which shall regain a temperature of (218 2) C within 1 h to 2 h after insertion of the test pieces) and hold at this temperature for a further 1h after the specified temperat

32、ure has been regained. Remove the test pieces from the freezer, place them in a water bath at (20 2) C and apply heat in order to maintain the temperature of the water bath at this level over 1 h to 2 h. The test pieces shall be placed on edge, and there shall be 20 mm to 25 mm of water above the up

33、per edge. After each cycle the test pieces shall be inverted. During both the cooling and heating (freezing and thawing) cycles, the test pieces shall be positioned to enable free circulation of the conducting medium (air in the freezer or water in the bath) around them. The clearance between any ed

34、ge or face, with the exception of contact with discontinuous supports, shall be at least 10 mm. Each freezethaw cycle shall take between 4 h and 6 h. To provide buffer time between two cycles, as in the case of manual operation, this duration can be extended by storage of the test pieces, for up to

35、72 h, in the freezer as defined in 4.1. The freezethaw cycle shall be repeated 50 times unless otherwise specified. NOTE 1. It is recommended that panels should be at least 28 days old prior to commencement of the cyclic pre-treatment. NOTE 2. Control of the freezethaw cycles can be automatic or man

36、ual. Continuous automatic cycling is preferable. For manual control the completion of each cycle should be recorded.Page 4 EN 1328 : 1996 BSI 1997 After the cycles are completed, the test pieces shall be conditioned to constant mass in an atmosphere with a relative humidity of (65 5) % and a tempera

37、ture of (20 2) C. Constant mass is considered to be reached when the results of two successive weighing operations, carried out at an interval of 24 h, do not differ by more than 0,1 % of the mass of the test piece. At the end of this procedure carry out the bending test as specified in EN 310, incl

38、uding the determination of dimensions of the test piece after cyclic treatment. 7 Expression of results For each pair of test pieces i (i is between 1 and 48), calculate the individual ratio, R i , to two significant figures as follows: R i = f 2i / f 1i (1) where f 1i is the bending strength in new

39、tons per square millimetre of the test piece of the first batch from the i th pair tested and calculated from dimensions prior to cyclic treatment f 2i is the bending strength in newtons per square millimetre of the test piece of the second batch from the i th pair after freezethaw cycling and calcu

40、lated from dimensions following cyclic treatment. Calculate the average of R and standard deviation s,o f the individual ratios R i . Calculate the 95 % lower confidence estimate R L of the average ratio, to two significant figures as follows: R L = R2 0,24 s (2) NOTE. A value of ratio R L of 0,7 is

41、 regarded as providing satisfactory external performance. 8 Test report This shall be set out as described in EN 326-1, and the following shall be recorded: the direction from which the test pieces were removed from the panel; the value of R L ; the full climatic history of the panels up to time of

42、testing; the date of manufacture of the panel (where known); the date of test.Page 5 EN 1328 : 1996 BSI 1997 Annex A (informative) Bibliography prEN 326-2 Wood-based panels Sampling, cutting and inspection Part 2: Quality control in the factory prEN 326-3 Wood-based panels Sampling, cutting and insp

43、ection Part 3: Inspection of a consignment of panels EN 633 Cement bonded particleboards Definition and classification EN 634-1 Cement bonded particleboards Specifications Part 1: General requirements prEN 634-2 Cement bonded particleboards Specifications Part 2: Basic requirements6 blank BSI 1997 B

44、S EN 1328 : 1997 List of references See national foreword.BSI 389 Chiswick High Road London W4 4AL | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |

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