The Experts below are selected from a list of 6189 Experts worldwide ranked by ideXlab platform
Arved Soetbeer - One of the best experts on this subject based on the ideXlab platform.
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Durability of english oak quercus robur l comparison of decay progress and resistance under various laboratory and field conditions
International Biodeterioration & Biodegradation, 2014Co-Authors: Linda Meyer, Christian Brischke, Karin Brandt, Eckhard Melcher, Marietherese Lenz, Arved SoetbeerAbstract:Abstract Various procedures are used for testing the Durability of wood and wood based materials for decades. Generally they can be divided in field and laboratory tests, whereby lab tests allow more defined and reproducible conditions and benefit from shorter test durations. However, while laboratory test results are hardly transferable to real life situations, field tests ensure more realistic conditions. For instance natural weathering and detoxification of biocidal compounds through so called “non-target-organisms” is assured only under outdoor field exposure. Due to these dissimilarities a diverse and in some cases also unrealistic Classification of wood Durability can be obtained when testing a material exclusively under laboratory conditions. This study will exemplarily focus on English oak (Quercus robur L.), which is Classified as ‘durable’ according to the European Standard EN 350-2 (1994) . Results from several laboratory and field test studies showed an enormously high variation of its Durability between ‘very durable’ (Durability Class (DC) 1, EN 350-1 (1994) ) to ‘not durable’ (DC 5). Therefore this study aimed on a comparative evaluation of the Durability of English oak in laboratory and field tests using standard specimens, but also full-size components under in-service conditions. The test results showed only little variation in Durability of different oak origins. However it was indicated that a transferability of results determined in laboratory decay tests with pure cultures to the performance of a certain material in outdoor exposure is possible only to a limited extend.
Holger Militz - One of the best experts on this subject based on the ideXlab platform.
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resistance of pinus leucodermis heartwood and sapwood against the brown rot fungus coniophora puteana
Wood Material Science and Engineering, 2012Co-Authors: Stergios Adamopoulos, Antje Gellerich, G Mantanis, Tatiana Kalaitzi, Holger MilitzAbstract:This study assessed the decay resistance of Pinus leucodermis wood to the brown-rot fungus Coniophora puteana. Based upon the median weight losses of 30.65% for heartwood and of 34.68% for sapwood obtained in the biological tests, both the heartwood and sapwood material examined was Classified as not durable (Durability Class 5) according to the CEN/TS 15083-1 Classification. Total extractives were low, 3.93% in heartwood and 1.00% in sapwood, while lignin content was 22.60% and 25.41% in heartwood and sapwood, respectively. It is highly recommended to use protective treatments before using P. leucodermis wood in outdoor conditions.
Karin Brandt - One of the best experts on this subject based on the ideXlab platform.
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Durability of english oak quercus robur l comparison of decay progress and resistance under various laboratory and field conditions
International Biodeterioration & Biodegradation, 2014Co-Authors: Linda Meyer, Christian Brischke, Karin Brandt, Eckhard Melcher, Marietherese Lenz, Arved SoetbeerAbstract:Abstract Various procedures are used for testing the Durability of wood and wood based materials for decades. Generally they can be divided in field and laboratory tests, whereby lab tests allow more defined and reproducible conditions and benefit from shorter test durations. However, while laboratory test results are hardly transferable to real life situations, field tests ensure more realistic conditions. For instance natural weathering and detoxification of biocidal compounds through so called “non-target-organisms” is assured only under outdoor field exposure. Due to these dissimilarities a diverse and in some cases also unrealistic Classification of wood Durability can be obtained when testing a material exclusively under laboratory conditions. This study will exemplarily focus on English oak (Quercus robur L.), which is Classified as ‘durable’ according to the European Standard EN 350-2 (1994) . Results from several laboratory and field test studies showed an enormously high variation of its Durability between ‘very durable’ (Durability Class (DC) 1, EN 350-1 (1994) ) to ‘not durable’ (DC 5). Therefore this study aimed on a comparative evaluation of the Durability of English oak in laboratory and field tests using standard specimens, but also full-size components under in-service conditions. The test results showed only little variation in Durability of different oak origins. However it was indicated that a transferability of results determined in laboratory decay tests with pure cultures to the performance of a certain material in outdoor exposure is possible only to a limited extend.
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comparative studies on the in ground and above ground Durability of european oak heartwood quercus petraea liebl and quercus robur l
European Journal of Wood and Wood Products, 2009Co-Authors: Christian Brischke, Christian Robert Welzbacher, Andreas Otto Rapp, U Augusta, Karin BrandtAbstract:The Durability of European oak (Quercus petraea Liebl. and Quercus robur L.) is controversially discussed since a long time. While it is Classified as a “durable” timber species (Durability Class 2, according to EN 350-2), results from different studies indicated a lower Durability. Therefore comparative studies with sessile oak and English oak were carried out including laboratory resistance tests against different basidiomycetes, soil box tests against soft rot and other soil-inhabiting micro-organisms, as well as in-ground and above-ground field trials at different test sites. Both oak species were rated “non-durable” (Durability Class 5, DC 5) in soil box tests and in-ground field trials and “slightly durable” (DC 4) in above-ground field trials. Solely results from laboratory tests with pure basidiomycete cultures led to partly better estimates (“very durable” to “moderately durable” DC 1-3), but did not represent the organisms responsible for decay in the field. For oak, EN 350-2 reflects only laboratory results but not the performance of the material in real field situations.
Christian Brischke - One of the best experts on this subject based on the ideXlab platform.
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Durability of english oak quercus robur l comparison of decay progress and resistance under various laboratory and field conditions
International Biodeterioration & Biodegradation, 2014Co-Authors: Linda Meyer, Christian Brischke, Karin Brandt, Eckhard Melcher, Marietherese Lenz, Arved SoetbeerAbstract:Abstract Various procedures are used for testing the Durability of wood and wood based materials for decades. Generally they can be divided in field and laboratory tests, whereby lab tests allow more defined and reproducible conditions and benefit from shorter test durations. However, while laboratory test results are hardly transferable to real life situations, field tests ensure more realistic conditions. For instance natural weathering and detoxification of biocidal compounds through so called “non-target-organisms” is assured only under outdoor field exposure. Due to these dissimilarities a diverse and in some cases also unrealistic Classification of wood Durability can be obtained when testing a material exclusively under laboratory conditions. This study will exemplarily focus on English oak (Quercus robur L.), which is Classified as ‘durable’ according to the European Standard EN 350-2 (1994) . Results from several laboratory and field test studies showed an enormously high variation of its Durability between ‘very durable’ (Durability Class (DC) 1, EN 350-1 (1994) ) to ‘not durable’ (DC 5). Therefore this study aimed on a comparative evaluation of the Durability of English oak in laboratory and field tests using standard specimens, but also full-size components under in-service conditions. The test results showed only little variation in Durability of different oak origins. However it was indicated that a transferability of results determined in laboratory decay tests with pure cultures to the performance of a certain material in outdoor exposure is possible only to a limited extend.
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comparative studies on the in ground and above ground Durability of european oak heartwood quercus petraea liebl and quercus robur l
European Journal of Wood and Wood Products, 2009Co-Authors: Christian Brischke, Christian Robert Welzbacher, Andreas Otto Rapp, U Augusta, Karin BrandtAbstract:The Durability of European oak (Quercus petraea Liebl. and Quercus robur L.) is controversially discussed since a long time. While it is Classified as a “durable” timber species (Durability Class 2, according to EN 350-2), results from different studies indicated a lower Durability. Therefore comparative studies with sessile oak and English oak were carried out including laboratory resistance tests against different basidiomycetes, soil box tests against soft rot and other soil-inhabiting micro-organisms, as well as in-ground and above-ground field trials at different test sites. Both oak species were rated “non-durable” (Durability Class 5, DC 5) in soil box tests and in-ground field trials and “slightly durable” (DC 4) in above-ground field trials. Solely results from laboratory tests with pure basidiomycete cultures led to partly better estimates (“very durable” to “moderately durable” DC 1-3), but did not represent the organisms responsible for decay in the field. For oak, EN 350-2 reflects only laboratory results but not the performance of the material in real field situations.
Linda Meyer - One of the best experts on this subject based on the ideXlab platform.
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Durability of english oak quercus robur l comparison of decay progress and resistance under various laboratory and field conditions
International Biodeterioration & Biodegradation, 2014Co-Authors: Linda Meyer, Christian Brischke, Karin Brandt, Eckhard Melcher, Marietherese Lenz, Arved SoetbeerAbstract:Abstract Various procedures are used for testing the Durability of wood and wood based materials for decades. Generally they can be divided in field and laboratory tests, whereby lab tests allow more defined and reproducible conditions and benefit from shorter test durations. However, while laboratory test results are hardly transferable to real life situations, field tests ensure more realistic conditions. For instance natural weathering and detoxification of biocidal compounds through so called “non-target-organisms” is assured only under outdoor field exposure. Due to these dissimilarities a diverse and in some cases also unrealistic Classification of wood Durability can be obtained when testing a material exclusively under laboratory conditions. This study will exemplarily focus on English oak (Quercus robur L.), which is Classified as ‘durable’ according to the European Standard EN 350-2 (1994) . Results from several laboratory and field test studies showed an enormously high variation of its Durability between ‘very durable’ (Durability Class (DC) 1, EN 350-1 (1994) ) to ‘not durable’ (DC 5). Therefore this study aimed on a comparative evaluation of the Durability of English oak in laboratory and field tests using standard specimens, but also full-size components under in-service conditions. The test results showed only little variation in Durability of different oak origins. However it was indicated that a transferability of results determined in laboratory decay tests with pure cultures to the performance of a certain material in outdoor exposure is possible only to a limited extend.
