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\n\n \n \n \n \n \n Folienlagerung von Käferholz.\n \n \n \n\n\n \n Brischke, C.; Bollmus, S.; Braun, M.; and Emmerich, L.\n\n\n \n\n\n\n
Holz-Zentralblatt, 146(15): 296–297. 2020.\n
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@article{brischke_folienlagerung_2020,\n\ttitle = {Folienlagerung von {Käferholz}},\n\tvolume = {146},\n\tlanguage = {Deutsch},\n\tnumber = {15},\n\tjournal = {Holz-Zentralblatt},\n\tauthor = {Brischke, Christian and Bollmus, Susanne and Braun, Marco and Emmerich, Lukas},\n\tyear = {2020},\n\tpages = {296--297},\n\tfile = {Brischke et al. - 2020 - Folienlagerung von Käferholz.pdf:/home/maicher/Zotero/storage/HMP6IZFP/Brischke et al. - 2020 - Folienlagerung von Käferholz.pdf:application/pdf},\n}\n\n
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\n\n \n \n \n \n \n \n Tensile and Impact Bending Properties of Chemically Modified Scots Pine.\n \n \n \n \n\n\n \n Bollmus, S.; Beeretz, C.; and Militz, H.\n\n\n \n\n\n\n
Forests, 11(1): 84. January 2020.\n
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\n\n \n \n Paper\n \n \n\n \n \n doi\n \n \n\n \n link\n \n \n\n bibtex\n \n\n \n \n \n abstract \n \n\n \n \n \n 1 download\n \n \n\n \n \n \n \n \n \n \n\n \n \n \n\n\n\n
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@article{bollmus_tensile_2020,\n\ttitle = {Tensile and {Impact} {Bending} {Properties} of {Chemically} {Modified} {Scots} {Pine}},\n\tvolume = {11},\n\tissn = {1999-4907},\n\turl = {https://www.mdpi.com/1999-4907/11/1/84},\n\tdoi = {10.3390/f11010084},\n\tabstract = {This study deals with the influence of chemical modification on elasto-mechanical properties of Scots pine (Pinus sylvestris L.). The elasto-mechanical properties examined were impact bending strength, determined by impact bending test; tensile strength; and work to maximum load in traction, determined by tensile tests. The modification agents used were one melamine-formaldehyde resin (MF), one low molecular weight phenol-formaldehyde resin, one higher molecular weight phenol-formaldehyde resin, and a dimethylol dihydroxyethyleneurea (DMDHEU). Special attention was paid to the influence of the solution concentration (0.5\\%, 5\\%, and 20\\%). With an increase in the concentration of each modification agent, the elasto-mechanical properties decreased as compared to the control specimens. Especially impact bending strength decreased greatly by modifications with the 0.5\\% solutions of each agent (by 37\\% to 47\\%). Modification with DMDHEU resulted in the highest overall reduction of the elasto-mechanical properties examined (up to 81\\% in work to maximum load in traction at 20\\% solution concentration). The results indicate that embrittlement is not primarily related to the degree of modification depended on used solution concentration. It is therefore assumed that molecular size and the resulting ability to penetrate into the cell wall could be crucial. The results show that, in the application of chemically modified wood, impact and tensile loads should be avoided even after treatment with low concentrations.},\n\tlanguage = {en},\n\tnumber = {1},\n\turldate = {2020-06-02},\n\tjournal = {Forests},\n\tauthor = {Bollmus, Susanne and Beeretz, Cara and Militz, Holger},\n\tmonth = jan,\n\tyear = {2020},\n\tpages = {84},\n\tfile = {Bollmus et al. - 2020 - Tensile and Impact Bending Properties of Chemicall.pdf:/home/maicher/Zotero/storage/PU5JK2KG/Bollmus et al. - 2020 - Tensile and Impact Bending Properties of Chemicall.pdf:application/pdf;Volltext:/home/maicher/Zotero/storage/GQRXWNG6/Bollmus et al. - 2020 - Tensile and Impact Bending Properties of Chemicall.pdf:application/pdf;Volltext:/home/maicher/Zotero/storage/IHDI4XVW/Bollmus et al. - 2020 - Tensile and Impact Bending Properties of Chemicall.pdf:application/pdf},\n}\n\n
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\n This study deals with the influence of chemical modification on elasto-mechanical properties of Scots pine (Pinus sylvestris L.). The elasto-mechanical properties examined were impact bending strength, determined by impact bending test; tensile strength; and work to maximum load in traction, determined by tensile tests. The modification agents used were one melamine-formaldehyde resin (MF), one low molecular weight phenol-formaldehyde resin, one higher molecular weight phenol-formaldehyde resin, and a dimethylol dihydroxyethyleneurea (DMDHEU). Special attention was paid to the influence of the solution concentration (0.5%, 5%, and 20%). With an increase in the concentration of each modification agent, the elasto-mechanical properties decreased as compared to the control specimens. Especially impact bending strength decreased greatly by modifications with the 0.5% solutions of each agent (by 37% to 47%). Modification with DMDHEU resulted in the highest overall reduction of the elasto-mechanical properties examined (up to 81% in work to maximum load in traction at 20% solution concentration). The results indicate that embrittlement is not primarily related to the degree of modification depended on used solution concentration. It is therefore assumed that molecular size and the resulting ability to penetrate into the cell wall could be crucial. The results show that, in the application of chemically modified wood, impact and tensile loads should be avoided even after treatment with low concentrations.\n
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\n\n \n \n \n \n \n \n Effect of size and shape of specimens on the mass loss caused by Coniophora puteana in wood durability tests.\n \n \n \n \n\n\n \n Brischke, C.; Grünwald, L. K.; and Bollmus, S.\n\n\n \n\n\n\n
European Journal of Wood and Wood Products, 78(4): 811–819. July 2020.\n
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@article{brischke_effect_2020,\n\ttitle = {Effect of size and shape of specimens on the mass loss caused by {Coniophora} puteana in wood durability tests},\n\tvolume = {78},\n\tissn = {1436-736X},\n\turl = {https://doi.org/10.1007/s00107-020-01559-0},\n\tdoi = {10.1007/s00107-020-01559-0},\n\tabstract = {The experimental basis for testing the biological durability of wood often includes incubation experiments with wood-destroying basidiomycetes. Numerous parameters can affect the mass loss by fungal decay (MLF) in laboratory durability tests and therefore being decisive for the resulting durability classification. Among others, the dimension of the wood specimen and the time of incubation impact on fungal decay. Hence, both parameters were examined within this study using 19 different specimen formats and four different incubation times. Specimens of larch heartwood (Larix decidua Mill.) were incubated with pure cultures of the brown rot fungus Coniophora puteana. Scots pine sapwood (Pinus sylvestris L.) was used as a reference. The wood specimens’ format turned out to significantly affect both mass loss by fungal decay (MLF) and resulting x-values when MLF of larch was compared with that of the reference Scots pine sapwood. Both measures were highest for specimen formats with moderate surface-volume ratios. MLF and x-values depended on specimen size and shape as well as on the time of incubation. Reducing the specimen volume generally led to higher MLF at a given incubation time, but prolonging incubation times led to higher x-values and thus to lower durability expressed as durability classes (DC). In summary, it appeared highly questionable that results of basidiomycete durability tests can be easily compared to each other when specimen format and/or incubation time deviate from the standard conditions.},\n\tlanguage = {en},\n\tnumber = {4},\n\turldate = {2021-01-20},\n\tjournal = {European Journal of Wood and Wood Products},\n\tauthor = {Brischke, Christian and Grünwald, Leopold K. and Bollmus, Susanne},\n\tmonth = jul,\n\tyear = {2020},\n\tpages = {811--819},\n\tfile = {Brischke et al. - 2020 - Effect of size and shape of specimens on the mass .pdf:/home/maicher/Zotero/storage/QTN5RUZG/Brischke et al. - 2020 - Effect of size and shape of specimens on the mass .pdf:application/pdf;Springer Full Text PDF:/home/maicher/Zotero/storage/K7T8ZHGW/Brischke et al. - 2020 - Effect of size and shape of specimens on the mass .pdf:application/pdf;Springer Full Text PDF:/home/maicher/Zotero/storage/3RSPW739/Brischke et al. - 2020 - Effect of size and shape of specimens on the mass .pdf:application/pdf},\n}\n\n
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\n The experimental basis for testing the biological durability of wood often includes incubation experiments with wood-destroying basidiomycetes. Numerous parameters can affect the mass loss by fungal decay (MLF) in laboratory durability tests and therefore being decisive for the resulting durability classification. Among others, the dimension of the wood specimen and the time of incubation impact on fungal decay. Hence, both parameters were examined within this study using 19 different specimen formats and four different incubation times. Specimens of larch heartwood (Larix decidua Mill.) were incubated with pure cultures of the brown rot fungus Coniophora puteana. Scots pine sapwood (Pinus sylvestris L.) was used as a reference. The wood specimens’ format turned out to significantly affect both mass loss by fungal decay (MLF) and resulting x-values when MLF of larch was compared with that of the reference Scots pine sapwood. Both measures were highest for specimen formats with moderate surface-volume ratios. MLF and x-values depended on specimen size and shape as well as on the time of incubation. Reducing the specimen volume generally led to higher MLF at a given incubation time, but prolonging incubation times led to higher x-values and thus to lower durability expressed as durability classes (DC). In summary, it appeared highly questionable that results of basidiomycete durability tests can be easily compared to each other when specimen format and/or incubation time deviate from the standard conditions.\n
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\n\n \n \n \n \n \n \n Critical discussion of perpendicular to grain tension testing of structural timber – case study on the European hardwoods ash, beech and maple.\n \n \n \n \n\n\n \n Schlotzhauer, P.; Ehrmann, A.; Bollmus, S.; and Militz, H.\n\n\n \n\n\n\n
Wood Material Science & Engineering, 15(5): 278–288. September 2020.\n
Publisher: Taylor & Francis _eprint: https://doi.org/10.1080/17480272.2019.1596157\n\n
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@article{schlotzhauer_critical_2020,\n\ttitle = {Critical discussion of perpendicular to grain tension testing of structural timber – case study on the {European} hardwoods ash, beech and maple},\n\tvolume = {15},\n\tissn = {1748-0272},\n\turl = {https://doi.org/10.1080/17480272.2019.1596157},\n\tdoi = {10.1080/17480272.2019.1596157},\n\tabstract = {Knowledge about perpendicular to grain tension behavior of wood is essential, since in construction tension stresses perpendicular to grain cannot be avoided completely. Especially for hardwoods, the data basis is scarce. EN 338 design values are with 0.6 N/mm² characteristic strength set very low. The US-American National Design Specifications even set this value to zero and make local reinforcements mandatory. This paper compares strength and stiffness values attained with newly-designed, little, prismatic specimens and EN 408 structural timber specimens to evaluate the current European design values. Little specimen’s characteristic strength values range from 7.2 to 10.6 N/mm² and are assumed to be real material properties. EN 408 specimen values are with approximately 4.0 N/mm² lower. These lower values are mainly due to stress peaks introduced by the force introduction. Strength values attained for the medium-dense European hardwoods beech, ash and maple exceed EN 338 design values by a factor of six to seven. Adaptation of the EN 338 design value is not recommended, though. The abundance of influencing factors makes clear that the design value and the ensuing design code have to be synchronized carefully by tedious testing in order to make use of the perpendicular to grain tension strength potential of the selected hardwoods.},\n\tnumber = {5},\n\turldate = {2020-08-24},\n\tjournal = {Wood Material Science \\& Engineering},\n\tauthor = {Schlotzhauer, Philipp and Ehrmann, Alexander and Bollmus, Susanne and Militz, Holger},\n\tmonth = sep,\n\tyear = {2020},\n\tnote = {Publisher: Taylor \\& Francis\n\\_eprint: https://doi.org/10.1080/17480272.2019.1596157},\n\tkeywords = {strength, stiffness, design value, EN 338, Hardwoods, perpendicular to grain, tension, test set-up},\n\tpages = {278--288},\n\tfile = {Full Text PDF:/home/maicher/Zotero/storage/H385PSKF/Schlotzhauer et al. - 2020 - Critical discussion of perpendicular to grain tens.pdf:application/pdf;Snapshot:/home/maicher/Zotero/storage/2A9W9FZD/17480272.2019.html:text/html},\n}\n\n
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\n Knowledge about perpendicular to grain tension behavior of wood is essential, since in construction tension stresses perpendicular to grain cannot be avoided completely. Especially for hardwoods, the data basis is scarce. EN 338 design values are with 0.6 N/mm² characteristic strength set very low. The US-American National Design Specifications even set this value to zero and make local reinforcements mandatory. This paper compares strength and stiffness values attained with newly-designed, little, prismatic specimens and EN 408 structural timber specimens to evaluate the current European design values. Little specimen’s characteristic strength values range from 7.2 to 10.6 N/mm² and are assumed to be real material properties. EN 408 specimen values are with approximately 4.0 N/mm² lower. These lower values are mainly due to stress peaks introduced by the force introduction. Strength values attained for the medium-dense European hardwoods beech, ash and maple exceed EN 338 design values by a factor of six to seven. Adaptation of the EN 338 design value is not recommended, though. The abundance of influencing factors makes clear that the design value and the ensuing design code have to be synchronized carefully by tedious testing in order to make use of the perpendicular to grain tension strength potential of the selected hardwoods.\n
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\n\n \n \n \n \n \n Development of procedures for sampling, testing, and classification to determine the biological durability of wood and wood products.\n \n \n \n\n\n \n Scheiding, W.; Jacobs, K.; Bollmus, S.; and Brischke, C.\n\n\n \n\n\n\n In
Proceedings IRG Annual Meeting, pages 8, online, webinar, June 2020. \n
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@inproceedings{scheiding_development_2020,\n\taddress = {online, webinar},\n\ttitle = {Development of procedures for sampling, testing, and classification to determine the biological durability of wood and wood products},\n\tdoi = {IRG 20-20676},\n\tabstract = {This paper informs about a research project, which deals with several shortcomings and a lack of clarity within EN 350:2016. The project started in January 2020, will run for 3 years, and is operated by the Institute of Wood Technology Dresden (IHD) and the University of Goettingen (UGOE).},\n\tlanguage = {en},\n\tbooktitle = {Proceedings {IRG} {Annual} {Meeting}},\n\tauthor = {Scheiding, Wolfram and Jacobs, Kordula and Bollmus, Susanne and Brischke, Christian},\n\tmonth = jun,\n\tyear = {2020},\n\tpages = {8},\n\tfile = {Scheiding et al. - Development of procedures for sampling, testing, a.pdf:/home/maicher/Zotero/storage/R9YUY9WS/Scheiding et al. - Development of procedures for sampling, testing, a.pdf:application/pdf},\n}\n\n
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\n This paper informs about a research project, which deals with several shortcomings and a lack of clarity within EN 350:2016. The project started in January 2020, will run for 3 years, and is operated by the Institute of Wood Technology Dresden (IHD) and the University of Goettingen (UGOE).\n
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\n\n \n \n \n \n \n Biological durability of sapling wood.\n \n \n \n\n\n \n Brischke, C.; Emmerich, L.; Nienaber, D. G B; and Bollmus, S.\n\n\n \n\n\n\n In
Proceedings IRG Annual Meeting, pages 11, The International Research Group on Wood Protection, June 2020. online, webinar\n
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@inproceedings{brischke_biological_2020,\n\taddress = {The International Research Group on Wood Protection},\n\ttitle = {Biological durability of sapling wood},\n\tdoi = {IRG/WP 20-10967},\n\tabstract = {Sapling-wood products from different wood species such as willow (Salix spp.) and Common hazel (Corylus avellana) are frequently used for gardening and outdoor decoration purposes. Remaining bark is suggested to provide additional biological durability. Even for temporary outdoor use it seemed questionable that durability of juvenile sapwood can provide acceptably long service lives of horticultural products. Therefore, sapling-wood from in total seven Europeangrown wood species was submitted to laboratory and field durability tests. In field tests, specimens with and without bark were tested in comparison and submitted to differently severe exposure situations, i.e. in ground contact, and above ground situations with and without water trapping. All materials under test were classified ‘not durable’ independently from any potential protective effect of remaining bark, which contradicted their suitability for outdoor applications if multiannual use is desired.},\n\tlanguage = {en},\n\tbooktitle = {Proceedings {IRG} {Annual} {Meeting}},\n\tpublisher = {online, webinar},\n\tauthor = {Brischke, Christian and Emmerich, Lukas and Nienaber, Dirk G B and Bollmus, Susanne},\n\tmonth = jun,\n\tyear = {2020},\n\tpages = {11},\n\tfile = {Brischke et al. - Biological durability of sapling wood.pdf:/home/maicher/Zotero/storage/LCR9RQAE/Brischke et al. - Biological durability of sapling wood.pdf:application/pdf},\n}\n\n
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\n Sapling-wood products from different wood species such as willow (Salix spp.) and Common hazel (Corylus avellana) are frequently used for gardening and outdoor decoration purposes. Remaining bark is suggested to provide additional biological durability. Even for temporary outdoor use it seemed questionable that durability of juvenile sapwood can provide acceptably long service lives of horticultural products. Therefore, sapling-wood from in total seven Europeangrown wood species was submitted to laboratory and field durability tests. In field tests, specimens with and without bark were tested in comparison and submitted to differently severe exposure situations, i.e. in ground contact, and above ground situations with and without water trapping. All materials under test were classified ‘not durable’ independently from any potential protective effect of remaining bark, which contradicted their suitability for outdoor applications if multiannual use is desired.\n
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\n\n \n \n \n \n \n Impact of fungal decay on the bending properties of wood.\n \n \n \n\n\n \n Bollmus, S.; van Niekerk, P. B.; and Brischke, C.\n\n\n \n\n\n\n In
Proceedings IRG Annual Meeting, pages 15, online, webinar, June 2020. \n
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@inproceedings{bollmus_impact_2020,\n\taddress = {online, webinar},\n\ttitle = {Impact of fungal decay on the bending properties of wood},\n\tdoi = {IRG/WP 20-20671},\n\tabstract = {Wood used outdoors is generally prone to fungal degradation, and its impact on the structural integrity of wood is an immanent factor for service life planning with timber. Wood decayed to very small mass losses can suffer from a significant reduction in mechanical strength and elastic properties. Hence, the latter are preferred indicators to detect decay in wood durability studies. Numerous previous studies suggested, for instance, modulus of elasticity (MOE) measurements for decay detection since they outperform mass loss in terms of sensitivity. However, literature reports on the topic are not always consistent and partly contradictory. Therefore, this study aimed at 1.) comparing different methods for decay detection with respect to their sensitivity to decay and transferability to each other, and at 2.) quantifying the effect of white and brown rot decay on bending properties of wood.},\n\tlanguage = {en},\n\tbooktitle = {Proceedings {IRG} {Annual} {Meeting}},\n\tauthor = {Bollmus, Susanne and van Niekerk, Philip Bester and Brischke, Christian},\n\tmonth = jun,\n\tyear = {2020},\n\tpages = {15},\n\tfile = {Bollmus et al. - Impact of fungal decay on the bending properties o.pdf:/home/maicher/Zotero/storage/YY2EEG6C/Bollmus et al. - Impact of fungal decay on the bending properties o.pdf:application/pdf},\n}\n\n
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\n Wood used outdoors is generally prone to fungal degradation, and its impact on the structural integrity of wood is an immanent factor for service life planning with timber. Wood decayed to very small mass losses can suffer from a significant reduction in mechanical strength and elastic properties. Hence, the latter are preferred indicators to detect decay in wood durability studies. Numerous previous studies suggested, for instance, modulus of elasticity (MOE) measurements for decay detection since they outperform mass loss in terms of sensitivity. However, literature reports on the topic are not always consistent and partly contradictory. Therefore, this study aimed at 1.) comparing different methods for decay detection with respect to their sensitivity to decay and transferability to each other, and at 2.) quantifying the effect of white and brown rot decay on bending properties of wood.\n
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