Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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    A non-destructive approach for assessing decay in preservative treated wood
    Machek, L. ; Edlund, M.L. ; Sierra-Alvarez, R. ; Militz, H. - \ 2004
    Wood Science and Technology 37 (2004)5. - ISSN 0043-7719 - p. 411 - 417.
    This study investigated the suitability of the non-destructive vibration-impulse excitation technique to assess the attack of preservative-treated wood in contact with the ground. Small stakes (10×5×100 mm3) of treated and untreated Scots pine sapwood were exposed to decay in laboratory-scale terrestrial ecosystems. Different soils were used to prove the influence of different types of wood destroying micro-organisms. Wood decay was monitored periodically for one year by determining mass losses and changes in dynamic modulus of elasticity. The results show a large variability in resistance against attacking fungi, depending on wood preservative and soil type. The non-destructive approach using the dynamic modulus of elasticity proved to be a good and sensitive tool for assessing the attack of stakes in laboratory soil testing
    Biological durability of wood in relation to end-use - Part 1. Towards a European standard for laboratory testing of the biological durability of wood
    Acker, J. Van; Stevens, M. ; Carey, J. ; Sierra-Alvarez, R. ; Militz, H. ; Bayon, I. Le; Kleist, G. ; Peek, R.D. - \ 2003
    Holz als Roh- und Werkstoff 61 (2003)1. - ISSN 0018-3768 - p. 35 - 45.
    The determination of biological durability of wood is an issue requiring sufficient reliability regarding end-use related prediction of performance. Five test institutes joined efforts to check standard test methods and to improve methodology and data interpretation for assessment of natural durability of timber species. A range of softwood and hardwood species was tested using both basidiomycete and soil soft rot testing. Based on combined processing of all data collected, an improved and simplified durability classification system was established. The test methods and the interpretation of results are proposed to be used to assess suitability and service life for applications under European hazard class 3 and 4. The methodology for basidiomycete testing only requires two test fungi and allows direct classification based on median mass loss, while for soil bed testing, which is only required when hazard class 4 applications are envisaged, a slightly more complicated approach proved to be necessary mainly due to variation in test soil parameters. Since service life can be based on natural durability classes, it is evident that these are identified differently for uses in or out of ground contact and for softwoods or hardwoods
    Analysis of acetylated wood by electron microscopy
    Sander, C. ; Beckers, E.P.J. ; Militz, H. ; Veenendaal, W. van - \ 2003
    Wood Science and Technology 37 (2003)1. - ISSN 0043-7719 - p. 39 - 46.
    dimensional stability
    The properties of acetylated solid wood were investigated earlier, in particular the anti-shrink efficiency and the resistance against decay. This study focuses on the possible changes and damage to the wood structure due to an acetylation process leading to weight per cent gains of up to 20%. Electron microscopy (SEM and TEM) was used to investigate the fine structure of acetylated beech, pine and spruce. Cell wall swelling was observed, but no evidence of damage could be seen as a result of the acetylation procedure. The fine structure of the wood tissue such as the pits and the thin parenchyma walls appeared untouched
    Investigation on natural durability and sorption properties of Italian Chestnut (Castanea sativa Mill.) from coppice stands
    Militz, H. ; Busetto, D. ; Hapla, F. - \ 2003
    Holz als Roh- und Werkstoff 61 (2003)2. - ISSN 0018-3768 - p. 133 - 141.
    wood
    Castanea sativa Mill. from coppice stands in Italy were evaluated. Fungi trials with different white rot, brown rot and soft rot fungi showed, that the heartwood of chestnut can be classified following EN 350 in durability class 2 as ¿durable¿. However, the durability within the tested material (between trees and planks) can vary considerably. The highest reported durability was class 1 (very durable), whereas other samples were classified as ¿non-durable¿ (class 5). Under soil conditions, where soft rot organism are active, the variation within the tested collective was lower, however resulting in an average ¿moderate durability¿ (class 3). No statistical provable difference between juvenile wood and mature wood was detected. Furthermore, sorption properties and subsequent shrinkage and swelling were determined. Mature wood shows somewhat higher sorption properties and transverse shrinkage/swelling values than juvenile wood. However, longitudinal shrinkage is higher for juvenile wood
    Increasing the water repellency of Scots pine sapwood.
    Eckeveld, A. van; Homan, W.J. ; Militz, H. - \ 2001
    Holzforschung und Holzverwertung 6 (2001). - ISSN 0018-3849 - p. 113 - 115.
    The influence of wood moisture content on dynamic modulus of elasticity measurements in durability testing
    Machek, L. ; Militz, H. ; Sierra-Alvarez, R. - \ 2001
    Holzforschung und Holzverwertung 2001 (2001)5. - ISSN 0018-3849 - p. 97 - 100.
    The use of an acoustic technique to assess wood decay in laboratory soil-bed tests
    Machek, L. ; Militz, H. ; Sierra-Alvarez, R. - \ 2001
    Wood Science and Technology 34 (2001). - ISSN 0043-7719 - p. 467 - 472.
    This study assesses the changes in elastic behaviour (i.e. modulus of elasticity - MOE) and mass loss of different hardwood and softwood species exposed to decay in laboratory soil-bed tests. Elasticity moduli were determined using conventional static methods as well as a dynamic method based on flexural vibration. The results obtained show a high correlation between dynamic and static bending measurements for all the timber species tested at different stages of fungal decay. Furthermore, the non-destructive MOE assessment proved to be a good tool for the early detection of wood decay.
    The wood of Metasequioa glyptostroboides (Hu et Cheng) of Dutch origin
    Polman, J.E. ; Michon, S.G.L. ; Militz, H. ; Helmink, A.Th.F. - \ 1999
    Holz als Roh- und Werkstoff 57 (1999). - ISSN 0018-3768 - p. 215 - 221.
    Dynamic modules of elasticity by flexural vibration : a non-destructive approach in field testing of wood preservatives and wood decay testing
    Militz, H. ; Machek, L. ; Sierra-Alvarez, R. - \ 1999
    In: Cost Action E2 - Conference "Wood durability", St. Gallen, Switserland, 25 - 27 January 1999. - [S.l.] : [s.n.], 1999 - p. 2 - 9.
    Effect of wood moisture content on dynamic moe measurements
    Machek, L. ; Militz, H. ; Sierra-Alvarez, R. - \ 1999
    In: Proceedings 30th Annual meeting of the International Research group on wood preservation, Rosenheim, Germany, 6 - 11 June 1999. / IRG Secretariaat, Stockholm, Sweden. - Stockholm : IRG Secretariaat, 1999 - p. 33 - 33.
    Sorption behaviour and dimensional changes of wood-coating composites
    Meijer, M. de; Militz, H. - \ 1999
    Holzforschung 53 (1999). - ISSN 0018-3830 - p. 553 - 560.
    Laboratory testing of natural durability including basidiomycetes and soil inhabiting micro-organisms
    Acker, J. van; Carey, J. ; Sierra-Alvarez, R. ; Bayon, I. le; Grinda, M. ; Militz, H. ; Peek, R.D. - \ 1999
    In: Cost Action E2 - Conference "Wood durability", St. Gallen, Switserland, 25 - 27 January 1999. - [S.l.] : [s.n.], 1999 - p. 2 - 13.
    Laboratory testing of wood natural durability in soil-bed assays.
    Sierra-Alvarez, R. ; Bayon, I. le; Carey, J. ; Stephan, I. ; Acker, J. van; Grinda, M. ; Kleist, G. ; Militz, H. ; Peek, R.D. - \ 1998
    In: 29th Annual meeting of the Int. Research Group on Wood Preservation, Maastricht, The Netherlands (1998)
    Moisture content development in lap-joints of different wood species in outside exposure trials.
    Militz, H. ; Broertjes, M. ; Bloom, C.J. - \ 1998
    In: 29th Annual meeting of the Int. Research Group on Wood Preservation, Maastricht, The Netherlands (1998)
    Acoustic technique for assessing decay in perservative treated wood.
    Machek, L. ; Edlund, M.L. ; Sierra-Alvarez, R. ; Militz, H. - \ 1998
    In: 29th Annual meeting of the Int. Research Group on Wood Preservation, Maastricht, The Netherlands (1998)
    A dynamic approach to assess the modulus of elasticity in wood decay testing.
    Machek, L. ; Militz, H. ; Sierra-Alvarez, R. - \ 1998
    In: 29th Annual meeting of the Int. Research Group on Wood Preservation, Maastricht, The Netherlands (1998)
    Criteria for basidiomycete testing and ways of defining natural durability classes.
    Acker, J. van; Stevens, M. ; Carey, J. ; Sierra-Alvarez, R. ; Militz, H. ; Bayon, I. le; Kleist, G. ; Peek, R.D. - \ 1998
    In: 29th Annual meeting ot the Int. Research Group on Wood Preservation, Maastricht, The Netherlands (1998)
    Characterisation of thermally modified wood: molecular reasons for wood performance improvement.
    Tjeerdsma, B.F. ; Boonstra, M. ; Pizzi, A. ; Tekely, P. ; Militz, H. - \ 1998
    Holz als Roh- und Werkstoff 56 (1998). - ISSN 0018-3768 - p. 149 - 153.
    Comparative study on penetration characteristics of modern wood coatings.
    Meijer, M. de; Thurich, K. ; Militz, H. - \ 1998
    Wood Science and Technology 32 (1998). - ISSN 0043-7719 - p. 347 - 365.
    Wet adhesion measurements of wood coatings.
    Meijer, M. de; Militz, H. - \ 1998
    Holz als Roh- und Werkstoff 56 (1998). - ISSN 0018-3768 - p. 306 - 306.
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