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1、DRAFT FOR DEVELOPMENT DD CEN/TS 15083-2:2005 Durability of wood and wood-based products Determination of the natural durability of solid wood against wood-destroying fungi, test methods Part 2: Soft rotting micro-fungi ICS 79.040 ? Licensed Copy: London South Bank University, London South Bank Unive
2、rsity, Tue Dec 12 05:49:56 GMT+00:00 2006, Uncontrolled Copy, (c) BSI DD CEN/TS 15083-2:2005 This Draft for Development was published under the authority of the Standards Policy and Strategy Committee and comes into effect on 14 November 2005 BSI 14 November 2005 ISBN 0 580 46604 3 National foreword
3、 This Draft for Development is the official English language version of CEN/TS 15083-2:2005. This publication is not to be regarded as a British Standard. It is being issued in the Draft for Development series of publications and is of a provisional nature because the Technical Committee wants to as
4、sess its usefulness. It should be applied on this provisional basis, so that information and experience of its practical application may be obtained. Comments arising from the use of this Draft for Development are requested so that UK experience can be reported to the European organization responsib
5、le for its conversion to a European standard. A review of this publication will be initiated 2 years after its publication by the European organization so that a decision can be taken on its status at the end of its 3-year life. Notification of the start of the review period will be made in an annou
6、ncement in the appropriate issue of Update Standards. According to the replies received by the end of the review period, the responsible BSI Committee will decide whether to support the conversion into a European Standard, to extend the life of the Technical Specification or to withdraw it. Comments
7、 should be sent in writing to the Secretary of BSI Subcommittee B/515/1, Preservative preconditioning and biological testing, at British Standards House, 389 Chiswick High Road, London W4 4AL, giving the document reference and clause number and proposing, where possible, an appropriate revision of t
8、he text. A list of organizations represented on this subcommittee can be obtained on request to its secretary. Cross-references The British Standards which implement international or European publications referred to in this document may be found in the BSI Catalogue under the section entitled “Inte
9、rnational Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Summary of pages Th
10、is document comprises a front cover, an inside front cover, the CEN/TS title page, pages 2 to 25 and a back cover. The BSI copyright date displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. DateComments Licensed Copy: London South Bank
11、 University, London South Bank University, Tue Dec 12 05:49:56 GMT+00:00 2006, Uncontrolled Copy, (c) BSI TECHNICAL SPECIFICATION SPCIFICATION TECHNIQUE TECHNISCHE SPEZIFIKATION CEN/TS 15083-2 July 2005 ICS 79.040 English Version Durability of wood and wood-based products - Determination of the natu
12、ral durability of solid wood against wood-destroying fungi, test methods - Part 2: Soft rotting micro-fungi Durabilit du bois et des matriaux drivs - Dtermination de la durabilit naturelle du bois massif vis-vis des champignons lignivores, mthodes dessai - Partie 2: Micro-organismes de pourriture mo
13、lle Dauerhaftigkeit von Holz und Holzprodukten - Bestimmung der natrlichen Dauerhaftigkeit von Vollholz gegen holzzerstrende Pilze, Prfverfahren - Teil 2: Moderfulepilze This Technical Specification (CEN/TS) was approved by CEN on 1 March 2005 for provisional application. The period of validity of t
14、his CEN/TS is limited initially to three years. After two years 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
15、as for an EN and to make the CEN/TS available promptly at national 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 t
16、he national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingd
17、om. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: rue de Stassart, 36 B-1050 Brussels 2005 CENAll rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. CEN/TS 15083-2:2005: E
18、 Licensed Copy: London South Bank University, London South Bank University, Tue Dec 12 05:49:56 GMT+00:00 2006, Uncontrolled Copy, (c) BSI 2 Contents Page Foreword 3 Introduction4 1 Scope.5 2 Normative references .5 3 Terms and definitions.5 4 Principle.5 5 Test materials and apparatus.5 6 Test spec
19、imens.7 7 Procedure8 8 Calculation of x-value.11 9 Test report.12 Annex A (informative) Guidance on sampling14 Annex B (informative) Determination of water holding capacity 15 Annex C (informative) Rapid soil virulence test.17 Annex D (informative) Diagnostic microscopy of exposed samples18 Annex E
20、(informative) Assessment of results21 Annex F (informative) Example of a test report for a softwood timber 22 Bibliography.25 DD CEN/TS 15083-2:2005 Licensed Copy: London South Bank University, London South Bank University, Tue Dec 12 05:49:56 GMT+00:00 2006, Uncontrolled Copy, (c) BSI 3 Foreword Th
21、is document (CEN/TS 15083-2:2005) has been prepared by Technical Committee CEN/TC 38 “Durability of wood and wood-based products”, the secretariat of which is held by AFNOR. This document consists of two parts, Part 1 determines the natural durability of solid wood against wood destroying basidiomyc
22、etes fungi and Part 2 against soft rotting micro-fungi. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to announce this CEN Technical Specification: Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, Fran
23、ce, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. DD CEN/TS 15083-2:2005 Licensed Copy: London South Bank University, London South Bank University,
24、 Tue Dec 12 05:49:56 GMT+00:00 2006, Uncontrolled Copy, (c) BSI 4 Introduction This CEN Technical Specification describes a laboratory method of test which gives a basis for the assessment of the natural durability of a sample of timber against micro-fungi (ascomycetes and fungi imperfecti) which ca
25、use soft rot of wood in service. The infection source is the natural micro-flora of the soil substrate which can also contain other micro-organisms, such as bacteria, and other fungi such as moulds and basidiomycetes. These other organisms can influence the development of soft rot attack in the test
26、 specimens. The natural durability of a species of timber can vary depending on the conditions of growth such as climate and soil type. For this reason, the durability established using the method described in this CEN Technical Specification will relate only to the sample of timber tested. Guidance
27、 on sampling is given in Annex A. This laboratory method provides one criterion by which the durability of the timber can be assessed. It is recommended that this information be supplemented by data from other relevant tests, for example CEN/TS 15083-1, and above all by practical experience. The pro
28、cedures described in this CEN Technical Specification are intended to be carried out by suitably trained and/or supervised specialists. DD CEN/TS 15083-2:2005 Licensed Copy: London South Bank University, London South Bank University, Tue Dec 12 05:49:56 GMT+00:00 2006, Uncontrolled Copy, (c) BSI 5 1
29、 Scope This CEN Technical Specification specifies a method of test for determining the natural durability of a timber against soft rotting micro-fungi. The method is applicable to all timber species. NOTE This method may be used in conjunction with an ageing procedure, for example EN 73 or EN 84. 2
30、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 document (including any amendments) applies. EN 84, Wood preservatives Ac
31、celerated ageing tests of treated wood prior to biological testing Leaching procedure EN ISO 3696, Water for analytical laboratory use Specification and test methods (ISO 3696:1987) 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 supplier spo
32、nsor of the test (person or company providing the sample of timber to be tested) 4 Principle Test specimens prepared from the timber under test and reference timber test specimens are exposed to attack by soft rotting micro-fungi. After a prescribed period of incubation under defined conditions, the
33、 percentage loss in dry mass of the test specimens is used to estimate the resistance of hardwood test timbers to attack by the test fungi and as the basis of a provisional durability rating. For softwood test timbers, the percentage loss in dry mass is recorded but the provisional durability rating
34、 is based on the loss of modulus of elasticity. 5 Test materials and apparatus 5.1 Biological material 5.1.1 Soil Natural top soil or a fertile loam-based horticultural soil 1) of pH 6 to pH 8 and not containing added agrochemical. It shall have a water holding capacity (WHC) of between 25 % and 60
35、%. NOTE 1 A suitable method for determining WHC is described in Annex B. 1) A horticultural soil of the John Innes No. 2 type and with the following composition has been found to be suitable; seven parts by volume loam, three parts by volume sphagnum peat, two parts by volume sharp sand plus 0,6 g c
36、halk and 6,0 g slow release fertilizer per litre of soil mixture. If the WHC is too high, it can be lowered by modifying the soil with the addition of sand. DD CEN/TS 15083-2:2005 Licensed Copy: London South Bank University, London South Bank University, Tue Dec 12 05:49:56 GMT+00:00 2006, Uncontrol
37、led Copy, (c) BSI 6 If a natural soil is used, it shall have the turf or top 50 mm removed and shall not be taken from a depth below 200 mm from the original surface. It shall be passed through a sieve of nominal aperture size 12,5 mm. If it is necessary to store the soil prior to use, it shall be s
38、tored in closed moisture proof containers. Before use, thoroughly mix the sample of soil. NOTE 2 The soil should only be collected in a moist condition. If a horticultural soil is used which is sterilised during its preparation, then 20 % of a natural soil, prepared as above, shall be added and the
39、soils thoroughly mixed prior to the start of the test. The soil shall be used only once. NOTE 3 If assurance of the virulence of the soil is required, the test procedure using cotton cloth described in Annex C, or a similar standardised procedure, may be used. 5.1.2 Reference timbers 5.1.2.1 Species
40、 The following species of wood shall be used for the tests: Scots pine sapwood (Pinus sylvestris Linnaeus) for tests with softwoods. beech (Fagus sylvatica Linnaeus) for tests with hardwoods and softwoods. 5.1.2.2 Wood quality The wood shall be free from cracks, stain, decay, insect damage or other
41、defects. The wood shall not have been water-stored, floated, chemically treated or steamed. NOTE Wood that has been kiln dried at temperatures below 60 C may be used. The Scots pine shall be exclusively sapwood containing little resin and having between 2,5 and 8 annual growth rings per 10 mm. The p
42、roportion of latewood in the annual rings shall not exceed 30 % of the whole. The beech shall be even-grained, free from tyloses and discoloration. It shall have between 2 and 6 annual growth rings per 10 mm. 5.1.2.3 Provision of reference timber test specimens Condition the wood to a mass fraction
43、of (12 2) % moisture content. Prepare planed strips having a cross- section of (10 0,1) mm (5 0,1) mm. The longitudinal faces shall be parallel to the direction of the grain. The annual rings shall have a contact angle of (90 15) to the broad faces. Make transverse cuts, neatly to give sharp edges a
44、nd a fine-sawn finish to the end-grain surfaces, to give reference timber test specimens (100 1) mm long. The test specimens shall originate from a minimum of three trees or shall be taken from a stock originally of more than 500 test specimens. NOTE 1 A moisture meter of the two-pronged electrical
45、conductivity type is suitable for assessing moisture content. NOTE 2 A moisture content of mass fraction (12 2) % can be achieved in the conditions provided by the conditioning chamber (5.2.1). DD CEN/TS 15083-2:2005 Licensed Copy: London South Bank University, London South Bank University, Tue Dec
46、12 05:49:56 GMT+00:00 2006, Uncontrolled Copy, (c) BSI 7 5.1.2.4 Dimensions and density of reference timber test specimens The dimensions of each reference timber test specimen at a mass fraction of (12 2) % moisture content shall be (100 1) mm (10 0,1) mm (5 0,1) mm. In a batch of test specimens, t
47、he density of an individual is permitted to differ from the mean value of the batch by 10 %. 5.1.2.5 Number and distribution of reference timber test specimens For softwoods use at least 30 reference timber test specimens but a minimum of three per test container. NOTE Both Scots pine sapwood and be
48、ech reference timber test specimens should be used in tests with softwoods. For hardwoods, the test specimens represent three sets of 10 replicates which can be assessed after different exposure periods (see 7.5.1). Mark each test specimen so that it can be identified throughout the test. 5.2 Materi
49、al Water, complying with grade 3 of EN ISO 3696. 5.3 Apparatus 5.3.1 Conditioning chamber, well ventilated and controlled at (20 2) C and (65 5) % relative humidity. 5.3.2 Drying oven, capable of being controlled at (103 2) C. 5.3.3 Desiccators, with efficient desiccant (silica gel for example). 5.3.4 Test containers, made of material which does not have a toxic effect on the soil inhabiting micro- organisms and provided with a ventilated lid. The