BS DD CEN TS 14464-2010 Sawn timber Method for assessment of case-hardening《锯材 表面硬化评定方法》.pdf

1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationDD CEN/TS 14464:2010Sawn timber Method forassessment of case-hardeningDD CEN/TS 14464:2010 DRAFT FOR DEVELOPMENTNational forewordThis Draft for Development is the UK implementati

2、on of CEN/TS14464:2010. It supersedes DD ENV 14464:2002 which is withdrawn.This publication is not to be regarded as a British Standard.It is being issued in the Draft for Development series of publicationsand is of a provisional nature. It should be applied on thisprovisional basis, so that informa

3、tion and experience of its practicalapplication can be obtained.Comments arising from the use of this Draft for Developmentare requested so that UK experience can be reported to theinternational organization responsible for its conversion toan international standard. A review of this publication wil

4、lbe initiated not later than 3 years after its publication by theinternational organization so that a decision can be taken on itsstatus. Notification of the start of the review period will be made inan announcement in the appropriate issue of Update Standards.According to the replies received by th

5、e end of the review period,the responsible BSI Committee will decide whether to support theconversion into an international Standard, to extend the life of theTechnical Specification or to withdraw it. Comments should be sentto the Secretary of the responsible BSI Technical Committee at BritishStand

6、ards House, 389 Chiswick High Road, London W4 4AL.The UK participation in its preparation was entrusted to TechnicalCommittee B/543, Round and sawn timber.A list of organizations represented on this committee can beobtained on request to its secretary.This publication does not purport to include all

7、 the necessaryprovisions of a contract. Users are responsible for its correctapplication. BSI 2010ISBN 978 0 580 69528 5ICS 79.040Compliance with a British Standard cannot confer immunity fromlegal obligations.This Draft for Development was published under the authority ofthe Standards Policy and St

8、rategy Committee on 31 August 2010Amendments issued since publicationDate Text affectedDD CEN/TS 14464:2010TECHNICAL SPECIFICATION SPCIFICATION TECHNIQUE TECHNISCHE SPEZIFIKATION CEN/TS 14464 July 2010 ICS 79.040 Supersedes ENV 14464:2002English Version Sawn timber - Method for assessment of case-ha

9、rdening Bois scis - Mthode de mesure de la cmentation Schnittholz - Verfahren zur Ermittlung der Verschalung This Technical Specification (CEN/TS) was approved by CEN on 15 May 2010 for provisional application. The period of validity of this CEN/TS is limited initially to three years. After two year

10、s the members of CEN will be requested to submit their comments, particularly on the question whether the CEN/TS can be converted into a European Standard. CEN members are required to announce the existence of this CEN/TS in the same way as for an EN and to make the CEN/TS available promptly at nati

11、onal level in an appropriate form. It is permissible to keep conflicting national standards in force (in parallel to the CEN/TS) until the final decision about the possible conversion of the CEN/TS into an EN is reached. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cr

12、oatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDAR

13、DIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: Avenue Marnix 17, B-1000 Brussels 2010 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. CEN/TS 14464:2010: EDD CEN/TS 14464:2010CEN/TS 14464:2010

14、 (E) 2 Contents Page Foreword 31 Scope 42 Normative references 43 Terms and definitions .44 Slicing test method 54.1 Apparatus .54.2 Procedure .54.3 Calculation and expression of results .7DD CEN/TS 14464:2010CEN/TS 14464:2010 (E) 3 Foreword This document (CEN/TS 14464:2010) has been prepared by Tec

15、hnical Committee CEN/TC 175 “Round and sawn timber”, the secretariat of which is held by AFNOR. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN and/or CENELEC shall not be held responsible for identifying any or all such paten

16、t rights. This document supersedes ENV 14464:2002. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to announce this Technical Specification: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Fin

17、land, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. DD CEN/TS 14464:2010CEN/TS 14464:2010 (E) 4 1 Scope This Technical Specificati

18、on defines a destructive method of assessing the case-hardening of a piece of sawn timber with reference to the distortion measured in a slice taken from the piece. This Technical Specification is applicable to sawn timber and timber which has been planed or surfaced by other means. It applies to bo

19、th hardwood and softwood with a thickness not greater than 100 mm. 2 Normative references The following referenced documents 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 docu

20、ment (including any amendments) applies. EN 844-1:1995, Round and sawn timber Terminology Part 1: General terms common to round timber and sawn timber EN 844-2:1997, Round and sawn timber Terminology Part 2: General terms relating to round timber EN 844-3:1995, Round and sawn timber Terminology Part

21、 3: General terms relating to sawn timber EN 844-4:1997, Round and sawn timber Terminology Part 4: Terms relating to moisture content EN 844-5:1997, Round and sawn timber Terminology Part 5: Terms relating to dimensions of round timber EN 844-6:1997, Round and sawn timber Terminology Part 6: Terms r

22、elating to dimensions of sawn timber EN 844-7:1997, Round and sawn timber Terminology Part 7: Terms relating to anatomical structure of timber EN 844-8:1997, Round and sawn timber Terminology Part 8: Terms relating to features of round timber EN 844-9:1997, Round and sawn timber Terminology Part 9:

23、Terms relating to features of sawn timber EN 844-10:1998, Round and sawn timber Terminology Part 10: Terms relating to stain and fungal attack EN 844-11:1998, Round and sawn timber Terminology Part 11: Terms relating to degrade by insects EN 844-12:2000, Round and sawn timber Terminology Part 12: Ad

24、ditional terms and general index 3 Terms and definitions For the purposes of this document, the terms and definitions given in EN 844-1:1995, EN 844-2:1997, EN 844-3:1995, EN 844-4:1997, EN 844-5:1997, EN 844-6:1997, EN 844-7:1997, EN 844-8:1997, EN 844-9:1997, EN 844-10:1998, EN 844-11:1998, EN 844

25、-12:2000 and the following apply. 3.1 conditioning additional treatment after a drying process, during which the possible case-hardening is reduced by re-wetting the surface layers of the timber by means of elevated relative humidity and temperature DD CEN/TS 14464:2010CEN/TS 14464:2010 (E) 5 4 Slic

26、ing test method 4.1 Apparatus 4.1.1 Calibrated measuring device, graduated in at least 0,1 mm steps. 4.1.2 Jig, as shown in Figure 1. Dimensions in millimetres Figure 1 Test jig for assessment of case-hardening 4.1.3 Slicing device. Band saw or circular saw to cut a cross section from a piece of saw

27、n timber. Sharp knife or saw to divide the test slice into two equal parts. 4.2 Procedure Saw a test slice, full cross section with 15 mm length taken in the direction of the grain at least 30 cm from either end of the piece of timber or at mid-point of pieces less than 600 mm long, according to Fig

28、ure 2. DD CEN/TS 14464:2010CEN/TS 14464:2010 (E) 6 Dimensions in millimetres Figure 2 Preparation of test slice The test slice shall be clean and free from features such as bark, knots, resin pockets and reaction wood. Resin wood shall be avoided. If defects exist, cut the test slice from the neares

29、t defect free area towards the centre of the piece of timber. Divide the test slice into two equal parts parallel to the face of the piece of sawn timber from which the test slice has been taken. Mark the two parts, as shown in Figure 3, in such a way that the two parts can be placed on top of each

30、other again in its original position. Figure 3 Division and marking of test slice Place the two parts of the test slice in a plastic bag and seal it. Keep at room temperature for 24 h for softwood test slices, 48 h for hardwood test slices in order to equalise the moisture gradient. At the end of th

31、is period remove the two parts from the bag and place them centred on the test jig, as shown in Figure 4. DD CEN/TS 14464:2010CEN/TS 14464:2010 (E) 7 Figure 4 Evaluation of case-hardening with test jig If the width of the piece of sawn timber and of the corresponding test slice is between 75 mm and

32、100 mm, place the two parts centred across the test jig pins that are at 75 mm pitch. Measure the distance between the two test pieces at mid-point, with an accuracy of 0,1 mm. 4.3 Calculation and expression of results From the measured value subtract the diameter of the test jig pins. Measured valu

33、es resulting from the test jig with 75 mm pin distance shall be multiplied by a factor of 1,78. The result may be a positive or negative number. This page deliberately left blankThis page deliberately left blankBSI is the independent national body responsible for preparing British Standardsand other

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