1、January 2015 Translation by DIN-Sprachendienst.English price group 13No part of this translation may be reproduced without prior permission ofDIN Deutsches Institut fr Normung e. V., Berlin. Beuth Verlag GmbH, 10772 Berlin, Germany,has the exclusive right of sale for German Standards (DIN-Normen).IC
2、S 71.100.50!%?C“2283299www.din.deDDIN EN 252Field test method for determining the relative protective effectiveness ofa wood preservative in ground contact;English version EN 252:2014,English translation of DIN EN 252:2015-01Freiland-Prfverfahren zur Bestimmung der relativen Schutzwirkung einesHolzs
3、chutzmittels im Erdkontakt;Englische Fassung EN 252:2014,Englische bersetzung von DIN EN 252:2015-01Essai de champ pour dterminer lefficacit protectrice relative dun produit deprservation du bois en contact avec le sol;Version anglaise EN 252:2014,Traduction anglaise de DIN EN 252:2015-01SupersedesD
4、IN EN 252:1990-04www.beuth.deIn case of doubt, the German-language original shall be considered authoritative.Document comprises 26 pages 12.14 DIN EN 252:2015-01 2 A comma is used as the decimal marker. National foreword This document (EN 252:2014) has been prepared by Technical Committee CEN/TC 38
5、 “Durability of wood and wood-based products” (Secretariat: AFNOR, France). The responsible German body involved in its preparation was the DIN-Normenausschuss Holzwirtschaft und Mbel (DIN Standards Committee Timber and Furniture), Working Committee NA 042-03-06 AA Dauerhaftig-keit von Holz und Holz
6、produkten. Amendments This standard differs from DIN EN 252:1990-04 as follows: a) assessment criteria for fungal decay have been changed (Subclause 11.2); b) minor changes have been made to the description of the rating system for the assessment of attack by termites (Subclause 11.3); c) Annex A ab
7、out the testing of wood that has not been treated with a wood preservative has been added; d) Annex B concerning the characterization of the field test site has been added; e) Annex C concerning the setting-out of the test stakes in the field test sites has been added; f) Annex D concerning the dete
8、rmination of the modulus of elasticity of the wood stakes has been added; g) the example of a test report in Annex E has been extended. Previous editions DIN EN 252: 1990-04 EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 252 November 2014 ICS 71.100.50 Supersedes EN 252:1989English Version Fie
9、ld test method for determining the relative protective effectiveness of a wood preservative in ground contact Essai de champ pour dterminer lefficacit protectrice relative dun produit de prservation du bois en contact avec le sol Freiland-Prfverfahren zur Bestimmung der relativen Schutzwirkung eines
10、 Holz chutzmittels im Erdkontakt This European Standard was approved by CEN on 30 August 2014. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-da
11、te lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
12、 under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, For
13、mer Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT
14、 EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2014 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 252:2014 EsEN 252:2014 (E) 2 Contents Page Foreword 4 In
15、troduction .5 1 Scope 6 2 Principle 6 3 Wood specimens .6 3.1 Wood species .6 3.2 Wood quality 6 3.3 Characteristics and dimension of stakes 6 3.4 Number of Stakes 7 3.5 Labelling of stakes.7 4 Sample of wood preservative .7 5 Conditioning and treatment of the stakes .7 5.1 Conditioning .7 5.2 Treat
16、ing process 7 5.3 Determination of retention of wood preservative product 8 5.4 Range of preservative retention .8 5.5 Post treatment conditioning of stakes 8 6 Reference stakes .8 6.1 Reference preservative .8 6.2 Alternative reference preservative .9 7 Untreated control stakes .9 8 Condition of th
17、e test field .9 9 Installation of the stakes in the test field . 10 10 Inspections 10 11 Evaluation 11 11.1 General . 11 11.2 Attack by microorganisms . 11 11.3 Attack by termites . 11 11.4 Simultaneous attack by microorganisms and termites 12 12 Duration of the test . 12 13 Conditions for the valid
18、ity of the test . 12 14 Test report . 12 Annex A (informative) Guidance for the testing of wood or wood based products that have not been treated with a wood preservative 15 Annex B (informative) Characterization of the field test site . 17 Annex C (informative) Example of pattern for setting up fie
19、ld stakes into the ground 18 DINEN 252:2015-01EN 252:2014 (E) 3 Annex D (informative) Determination of strength characteristics in wood stakes through measuring Modulus of Elasticity . 19 Annex E (informative) Example of a test report . 21 Bibliography 24 DINEN 252:2015-01EN 252:2014(E)4 Foreword Th
20、is document (EN 252:2014) 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 European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement,
21、 at the latest by May 2015 and conflicting national standards shall be withdrawn at the latest by May 2015. 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 al
22、l such patent rights. This document supersedes EN 252:1989. In relation to the previous version of the standard, the following main modifications have been made: change in the assessment criteria for fungal decay; minor changes in the description of termite attack; the addition of informative annexe
23、s concerning the determination of strength characteristics in wood stakes by measuring the modulus of elasticity; the characterization of field test sites and the setting-out of the test stakes in the field test sites. According to the CEN-CENELEC Internal Regulations, the national standards organiz
24、ations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Ma
25、lta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. DIN EN 252:2015-01 EN 252:2014(E)5 Introduction The method is primarily concerned with protection against microbial attack. However, it is also capable of being used in
26、 areas where a termite hazard exists. It should also be noted that microbial decay may alter the resistance of a stake to termite attack and that termite attack may obliterate evidence of microbial decay. This field method provides one criterion by which the effectiveness of a wood preservative prod
27、uct can be assessed in a ground contact situation (Use Class 4 according to EN 335). The main objective of the method described is to evaluate the effectiveness of a preservative relative to a reference material. For this reason permeable timbers are used throughout so that the protective efficacy o
28、f various retentions of wood preservative can be determined. NOTE Informative Annex A gives guidance for testing wood or wood based products in ground contact that have or have not been treated with a wood preservative. DINEN 252:2015-01EN 252:2014 (E) 6 1 Scope This European Standard specifies a fi
29、eld test method for evaluating the effectiveness of wood preservatives in a ground contact situation. Wood treated with a reference preservative is included for comparison. The protective effect of the test preservative is assessed in relation to the effect of a reference wood preservative applied b
30、y a specified treatment. 2 Principle Wooden stakes are treated with preservative solutions to give a range of preservative retentions. After drying and, if necessary, an appropriate fixation period, the stakes are partially buried in soil in selected test fields in the open. The stakes are regularly
31、 inspected and their condition compared with that of untreated controls and that of a group of stakes treated with a reference preservative both of which indicate the aggressiveness of the individual field. The different agents of attack and their respective intensities are recorded. 3 Wood specimen
32、s 3.1 Wood species Susceptible wood species that can be completely penetrated with preservative shall be chosen as follows: for every test the sapwood of Scots Pine (Pinus sylvestris (L), shall be used; it is recommended that a hardwood species of local importance is included if the preservative is
33、expected to be used in this type of wood; if desired other wood species may be incorporated in the test. 3.2 Wood quality The wood shall be straight-grained and free from knots, cracks, stain, decay, insect holes, reaction wood or other defects. Test stakes with a resinous appearance shall be avoide
34、d. The wood shall not have been water-stored, floated, chemically treated or steamed or dried at a temperature above 60 C. The Scots Pine sapwood shall show an average rate of growth of 2,5 to 10 annual rings per 10 mm. If additional wood species are to be used the range in the number of annual ring
35、s per 10 mm for each species shall be mentioned in the report. The test report shall also include the mean density and moisture content for the wood used in the preparation of the stakes. 3.3 Characteristics and dimension of stakes The boards shall be conditioned at (20 2) C, (65 5) % relative humid
36、ity. Stakes for test shall be cut from the test wood(s) as follows: DIN EN 252:2015-01 EN 252:2014 (E) 7 Each stake shall be planed to within the thickness tolerance indicated. When viewed at the cross-cut end, the rings shall be oriented tangentially to one of the 50 mm edges within the limits (0 2
37、5); The dimensions shall be: (500 2) mm x (50 1) mm x (25 0,5) mm when measured at a moisture content of (12 2) % (mass fraction). Each test shall be carried out with stakes of comparable density and any stakes in a test batch which have densities outside the range of 15 % of the mean density shall
38、be rejected. Additional stakes of different dimensions may also be included in the tests. 3.4 Number of Stakes At least 10 stakes per field for each wood preservative and retention shall be tested. A greater number of stakes shall be treated so that stakes with deviating retentions can be rejected (
39、5.3). Additional stakes may also be included for chemical analysis, to aid determination of retentions and/or penetration/distribution (see 5.3). To assess the virulence of the field conditions a series of at least 10 untreated control stakes shall be included in each field (see Clause 7). Include i
40、n each field at least two series of 10 standard reference stakes of Scots Pine treated according to 5.2 with a reference preservative (see Clause 6). 3.5 Labelling of stakes Each stake shall be labelled with an inert, long-lasting label or tag. NOTE A map of the position of each stake within the sit
41、e is desirable. 4 Sample of wood preservative The sample shall be representative of the wood preservative to be tested. It shall be stored and handled in accordance with written recommendations from the manufacturer. It is recommended to chemically quantify the active ingredients content. 5 Conditio
42、ning and treatment of the stakes 5.1 Conditioning The stakes should be conditioned in conditions to reach constant mass at (20 2) C and (65 5) %RH. The stakes shall be air-dried indoors, to a moisture content at which a good penetration of the wood preservative can be obtained. For vacuum / pressure
43、 processes the moisture content of the specimens shall be (12 2) % (mass fraction). 5.2 Treating process For the reference stakes and unless otherwise specified for the test stakes a full-cell process is to be used. A typical full-cell process has an initial vacuum which shall be less than 10 kPa (0
44、,10 bar) and maintained for at DIN EN 252:2015-01 EN 252:2014 (E) 8 least 30 min. Pressure of at least 1 MPa (10 bar) shall be applied for at least 90 min. Complete records of treatment shall be made for each charge. 5.3 Determination of retention of wood preservative product Calculate the volume of
45、 each stake before treatment from its dimensions (see Clause 3). If shaped to a point before treatment this shall be taken into account in the calculation. Determine the mass of each stake by weighing to the nearest 0,5 g. After treatment, allow the stake to drain for several minutes. Reweigh each s
46、take to the nearest 0,5 g to determine the mass of treatment solution absorbed. Calculate the retention value of each stake from the mass of treatment solution absorbed, the concentration of the treating solution and the calculated stake volume. Express the retention of the wood preservative product
47、 as kilograms per cubic metre of wood. Calculate the mean retention for each series of test stakes. Stakes with individual retentions deviating by more than 10 % from the mean value shall be rejected. 5.4 Range of preservative retention Test each preservative with at least three and preferably five
48、different retention levels. These different levels shall be achieved by using fresh preservative solutions at different dilutions and without varying the treatment conditions. Use a fresh solution at each dilution; the dilution of a quantity of solution which has been used already may be unsatisfactory because preferential absorption may have occurred during the previous treatment schedule. 5.5 Post treatment conditioning of stakes For those products requiring a fixation period the recommendations of the wo
