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Jones, Dennis
Publications (10 of 11) Show all publications
Popescu, C., Jones, D., Kržišnik, D. & Humar, M. (2020). Determination of the effectiveness of a combined thermal/chemical wood modification by the use of FT–IR spectroscopy and chemometric methods. Journal of Molecular Structure, 1200, Article ID 127133.
Open this publication in new window or tab >>Determination of the effectiveness of a combined thermal/chemical wood modification by the use of FT–IR spectroscopy and chemometric methods
2020 (English)In: Journal of Molecular Structure, ISSN 0022-2860, E-ISSN 1872-8014, Vol. 1200, article id 127133Article in journal (Refereed) Published
Abstract [en]

In this study, the combined effects of chemical (with tricine and bicine) and thermal treatments were investigated. The modifications which appeared in the wood structure were evaluated by infrared spectroscopy and chemometric methods (principal component analysis and hierarchical cluster analysis). After the treatment, about 6–7% of WPG was identified in treated samples, but further thermal treatment decreased the WPG to about 5%. The modifications appearing in the spectra were mostly related to increase of the intensities of the bands assigned to CO groups but also to N–H and C–N groups, with shifting of some bands to higher wavenumber values.

Place, publisher, year, edition, pages
Elsevier, 2020
Keywords
Softwood, Hardwood, Chemical modification, Thermal modification, Infrared spectroscopy, Chemometric methods
National Category
Other Mechanical Engineering
Research subject
Wood Science and Engineering
Identifiers
urn:nbn:se:ltu:diva-76209 (URN)10.1016/j.molstruc.2019.127133 (DOI)000496810900083 ()2-s2.0-85072810635 (Scopus ID)
Note

Validerad;2019;Nivå 2;2019-10-08 (johcin)

Available from: 2019-10-02 Created: 2019-10-02 Last updated: 2019-12-09Bibliographically approved
Verbist, M., Nunes, L., Jones, D. & Branco, J. M. (2019). 11 - Service life design of timber structures. In: Bahman Ghiassi and Paulo B. Lourenço (Ed.), Long-term Performance and Durability of Masonry Structures: Degradation Mechanisms, Health Monitoring and Service Life Design (pp. 311-336). Elsevier
Open this publication in new window or tab >>11 - Service life design of timber structures
2019 (English)In: Long-term Performance and Durability of Masonry Structures: Degradation Mechanisms, Health Monitoring and Service Life Design / [ed] Bahman Ghiassi and Paulo B. Lourenço, Elsevier, 2019, p. 311-336Chapter in book (Refereed)
Abstract [en]

Wood has been widely used by humans for millennia as a construction material and can be easily found in everyday life, anywhere around the world. Since wood is a natural, sustainable, and organic composite material, it can be affected by several wood-deteriorating agents under suitable climate exposure conditions, which may threaten the long-term performance of timber structures in their service life. In that context, this chapter covers the background, guidelines, and current research that can help engineers and architects when designing timber structures. It provides extended knowledge about different wood-deteriorating agents, the natural durability of wood, and the use class concept. Based on this, durability models can be established, taking into account the potential presence over time of wood deterioration agents and allowing design for improved service life. Preventive measures and protection systems can be defined from the beginning, whereas on-site monitoring and maintenance of timber structures should be continuously performed.

Place, publisher, year, edition, pages
Elsevier, 2019
National Category
Other Mechanical Engineering
Research subject
Wood Science and Engineering
Identifiers
urn:nbn:se:ltu:diva-72751 (URN)10.1016/C2016-0-03710-5 (DOI)978-0-08-102110-1 (ISBN)
Available from: 2019-01-31 Created: 2019-01-31 Last updated: 2019-01-31Bibliographically approved
Jones, D. & Sandberg, D. (2019). A review of wood modification across Europé as part of COST FP1407. In: Timber 2019: . Paper presented at Timber 2019, London, 3 - 4 Jul 2019 (pp. 107-112). Wood Technology Society, The Institute of Materials, Minerals and Mining, London
Open this publication in new window or tab >>A review of wood modification across Europé as part of COST FP1407
2019 (English)In: Timber 2019, Wood Technology Society, The Institute of Materials, Minerals and Mining, London , 2019, p. 107-112Conference paper, Published paper (Refereed)
Place, publisher, year, edition, pages
Wood Technology Society, The Institute of Materials, Minerals and Mining, London, 2019
National Category
Wood Science
Identifiers
urn:nbn:se:ltu:diva-76016 (URN)
Conference
Timber 2019, London, 3 - 4 Jul 2019
Available from: 2019-09-16 Created: 2019-09-16 Last updated: 2020-01-28
Jones, D. (2019). COST FP1303 “performance of bio-based building materials”. Paper presented at COST Action meeting, 6–7 September2017, Zagreb, Croatia. Wood Material Science & Engineering, 14(1)
Open this publication in new window or tab >>COST FP1303 “performance of bio-based building materials”
2019 (English)In: Wood Material Science & Engineering, ISSN 1748-0272, E-ISSN 1748-0280, Vol. 14, no 1Article in journal, Editorial material (Refereed) Published
Place, publisher, year, edition, pages
Taylor & Francis, 2019
National Category
Other Mechanical Engineering
Research subject
Wood Science and Engineering
Identifiers
urn:nbn:se:ltu:diva-71689 (URN)10.1080/17480272.2018.1528569 (DOI)000451558500001 ()2-s2.0-85054573001 (Scopus ID)
Conference
COST Action meeting, 6–7 September2017, Zagreb, Croatia
Available from: 2018-11-21 Created: 2018-11-21 Last updated: 2019-02-27Bibliographically approved
Kim, I., Karlsson, O., Jones, D. & Sandberg, D. (2019). Maleic anhydride and sodium hypophosphite as a potential wood modification system. In: Fredriksson M (Ed.) (Ed.), Proceedings of the 15th Annual Meeting of the Northern European Network for Wood Science and Engineering - WSE2019,  Lund, Sweden, October  9-10, pp. 28-30: . Paper presented at 15th Annual Meeting of the Northern European Network for Wood Science and Engineering - WSE2019 (pp. 28-30). Lund: Lund University Open Access
Open this publication in new window or tab >>Maleic anhydride and sodium hypophosphite as a potential wood modification system
2019 (English)In: Proceedings of the 15th Annual Meeting of the Northern European Network for Wood Science and Engineering - WSE2019,  Lund, Sweden, October  9-10, pp. 28-30 / [ed] Fredriksson M (Ed.), Lund: Lund University Open Access, 2019, p. 28-30Conference paper, Published paper (Refereed)
Place, publisher, year, edition, pages
Lund: Lund University Open Access, 2019
National Category
Wood Science
Research subject
Wood Science and Engineering
Identifiers
urn:nbn:se:ltu:diva-76391 (URN)
Conference
15th Annual Meeting of the Northern European Network for Wood Science and Engineering - WSE2019
Available from: 2019-10-14 Created: 2019-10-14 Last updated: 2020-01-28
Garskaite, E., Karlsson, O., Stankeviciute, Z., Aivaras, K., Jones, D. & Sandberg, D. (2019). Surface hardness and flammability of Na2SiO3 and nano-TiO2 reinforced wood composites. RSC Advances, 9(48), 27973-27986
Open this publication in new window or tab >>Surface hardness and flammability of Na2SiO3 and nano-TiO2 reinforced wood composites
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2019 (English)In: RSC Advances, ISSN 2046-2069, E-ISSN 2046-2069, Vol. 9, no 48, p. 27973-27986Article in journal (Refereed) Published
Abstract [en]

The objective of this study was to explore an effect of the combined inorganic materials on the wood hardness and flame-retardancy properties in a concept of sustainable material management. Herein, the reinforcement of Scots pine (Pinus sylvestris L.) sapwood with sodium silicate and TiO2 nanoparticles via vacuum-pressure technique is reported. Pyrolysis of modified wood was studied by TG-FTIR analysis; the results showed that maximum weight loss for the modified wood was obtained at 40–50 °C lower temperatures compared to the reference untreated wood. The Gram–Schmidt profiles and spectra extracted at maxima absorption from Gram–Schmidt plots indicated chemical changes in wood–inorganic composites. SEM/EDS analysis revealed the presence of Na–O–Si solid gel within the wood-cell lumen and showed that TiO2 was homogeneously distributed within the amorphous Na–O–Si glass-forming phase to form a thin surface coating. EDS mapping further revealed the higher diffusivity of sodium into the cell wall compared to the silicon compound. The presence of amorphous sodium silicate and nano-TiO2 was additionally confirmed by XRD analysis. FTIR spectra confirmed the chemical changes in Scots pine sapwood induced by alkalization. Brinell hardness test showed that the hardness of the modified wood increased with the highest value (44% increase in hardness) obtained for 10% Na2SiO3–nTiO2 modified wood. The results showed good correlation between TG and flammability test; limiting oxygen index (LOI) values for the wood–inorganic composites increased by 9–14% compared to the untreated wood.

Place, publisher, year, edition, pages
Royal Society of Chemistry, 2019
National Category
Wood Science Other Mechanical Engineering
Research subject
Wood Science and Engineering
Identifiers
urn:nbn:se:ltu:diva-76014 (URN)10.1039/c9ra05200c (DOI)000496137600064 ()
Funder
Swedish Research Council Formas, 2018-01198
Note

Validerad;2019;Nivå 2;2019-09-18 (johcin)

Available from: 2019-09-16 Created: 2019-09-16 Last updated: 2020-01-28Bibliographically approved
Gaff, M., Kačík, F., Gašparík, M., Todaro, L., Jones, D., Corleto, R., . . . Čekovská, H. (2019). The effect of synthetic and natural fire-retardants on burning and chemical characteristics of thermally modified teak (Tectona grandis L. f.) wood. Construction and Building Materials, 200, 551-558
Open this publication in new window or tab >>The effect of synthetic and natural fire-retardants on burning and chemical characteristics of thermally modified teak (Tectona grandis L. f.) wood
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2019 (English)In: Construction and Building Materials, ISSN 0950-0618, E-ISSN 1879-0526, Vol. 200, p. 551-558Article in journal (Refereed) Published
Abstract [en]

This article deals with the effect of various temperatures of thermal modification and fire retardants on selected burning characteristics and chemical wood components of teak (Tectona grandis L. f.) wood. The thermal modification was carried out at temperatures 160 °C, 180 °C and 210 °C. Subsequently, thermally modified wood was treated by natural (arabinogalactan) and synthetic (ammonium phosphate) fire retardants. The effect of thermal modification as well as fire retardant was detected by burning characteristics such as weight loss, burning rate, maximum burning rate, ratio of the maximum burning rate and time to reach maximum burning rate. The chemical changes caused by the influence of these factors were determined by changing the content of cellulose, hemicelluloses, holocellulose, lignin and extractives. The relationship between burning characteristics and chemical changes in the thermally modified wood was analyzed using Spearman’s correlation. The results showed that the thermal modification of teak wood had a negative effect on its ignition and burning properties. Synthetic fire retardant had the highest retardation effect in all cases. The natural fire retardant caused a better retardation effect on thermally modified wood at temperature 180 and 210 °C. The relative content of lignin, extractives and cellulose increased, while the amount of holocellulose and particularly hemicelluloses decreased.

Place, publisher, year, edition, pages
Elsevier, 2019
Keywords
Teak, Burning characteristics, Thermal modification, Chemical components, Fire retardant
National Category
Other Mechanical Engineering
Research subject
Wood Science and Engineering
Identifiers
urn:nbn:se:ltu:diva-72828 (URN)10.1016/j.conbuildmat.2018.12.106 (DOI)000458942400052 ()2-s2.0-85059173635 (Scopus ID)
Note

Validerad;2019;Nivå 2;2019-02-08 (johcin)

Available from: 2019-02-08 Created: 2019-02-08 Last updated: 2019-03-11Bibliographically approved
Kim, I., Karlsson, O., Antzutkin, O., Shah, F. U., Jones, D. & Sandberg, D. (2019). Wood modification with maleic anhydride and sodium hypophosphite. In: Proceedings of the 20th International Symposium on Wood, Fiber and Pulping Chemistry, ISWFPC20, September 9-11, 2019, Tokyo, Japan, 4 pp.: . Paper presented at Proceedings of the 20th International Symposium on Wood, Fiber and Pulping Chemistry, ISWFPC20, September 9-11, 2019, Tokyo, Japan, 4 pp. (pp. 1-4). Tokyo: The University of Tokyo
Open this publication in new window or tab >>Wood modification with maleic anhydride and sodium hypophosphite
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2019 (English)In: Proceedings of the 20th International Symposium on Wood, Fiber and Pulping Chemistry, ISWFPC20, September 9-11, 2019, Tokyo, Japan, 4 pp., Tokyo: The University of Tokyo , 2019, p. 1-4Conference paper, Published paper (Refereed)
Place, publisher, year, edition, pages
Tokyo: The University of Tokyo, 2019
National Category
Wood Science
Identifiers
urn:nbn:se:ltu:diva-76121 (URN)
Conference
Proceedings of the 20th International Symposium on Wood, Fiber and Pulping Chemistry, ISWFPC20, September 9-11, 2019, Tokyo, Japan, 4 pp.
Available from: 2019-09-26 Created: 2019-09-26 Last updated: 2020-01-28
Ugovšek, A., Šubic, B., Starman, J., Rep, G., Humar, M., Lesar, B., . . . Lozano, J. I. (2018). Short-term performance of wooden windows and facade elements made of thermally modified and non-modified Norway spruce in different natural environments. Paper presented at COST FP1303 Final meeting - Building with Bio-Based Materials: Best Practice and Performance Specification;6-7 September 2017;Faculty of Forestry, University of Zagreb, Zagreb, Croatia. Wood Material Science & Engineering, 14(1), 42-47
Open this publication in new window or tab >>Short-term performance of wooden windows and facade elements made of thermally modified and non-modified Norway spruce in different natural environments
Show others...
2018 (English)In: Wood Material Science & Engineering, ISSN 1748-0272, E-ISSN 1748-0280, Vol. 14, no 1, p. 42-47Article in journal (Refereed) Published
Abstract [en]

Thermally modified wood is becoming an increasingly popular material for different applications in buildings. Laboratory tests indicated a positive effect of thermal modification on durability, dimensional stability and thermal conductivity of wood. Therefore, windows and facade elements made of thermally modified Norway spruce and non-modified Norway spruce were tested in the field and installed in different test objects which were exposed at five locations in Europe (Slovenia, Germany, Sweden, and Spain). Results from monitoring showed that elements and windows made of thermally modified spruce (TMS) had considerably lower wood moisture content compared to the ones made of non-modified spruce and that wax further positively influenced moisture performance. Colour changes of TMS were more intensive compared to non-modified spruce but were successfully retarded by adding pigments to the wax. Mould and stain growth was largely dependent on the location, amount of precipitation and relative humidity.

Place, publisher, year, edition, pages
Taylor & Francis, 2018
Keywords
Norway spruce, thermal modification, wax, wooden facades, wooden windows
National Category
Other Mechanical Engineering
Research subject
Wood Science and Engineering
Identifiers
urn:nbn:se:ltu:diva-70188 (URN)10.1080/17480272.2018.1494627 (DOI)000451558500006 ()2-s2.0-85049625839 (Scopus ID)
Conference
COST FP1303 Final meeting - Building with Bio-Based Materials: Best Practice and Performance Specification;6-7 September 2017;Faculty of Forestry, University of Zagreb, Zagreb, Croatia
Note

Konferensartikel i tidskrift

Available from: 2018-08-01 Created: 2018-08-01 Last updated: 2019-02-13Bibliographically approved
Sandberg, D. & Jones, D. (2018). Wood modification ‒ different processes and their use in Europe.. In: Németh R, Teischinger A, Rademacher P, Bak M. (Ed.), Proceedings of the 8th hardwood conference with special focus on "new aspects on hardwood utilization - from science to technology": . Paper presented at 8th Hardwood Conference on New Aspects of Hardwood Utilization - From Science To Technology,OCT 25-26, 2018, Sopron, HUNGARY (pp. 12-13). Sopron
Open this publication in new window or tab >>Wood modification ‒ different processes and their use in Europe.
2018 (English)In: Proceedings of the 8th hardwood conference with special focus on "new aspects on hardwood utilization - from science to technology" / [ed] Németh R, Teischinger A, Rademacher P, Bak M., Sopron, 2018, p. 12-13Conference paper, Oral presentation with published abstract (Refereed)
Abstract [en]

Nowadays, wood modification is referred to as a process used to improve the physical, mechanical, or aesthetic properties of sawn timber, veneer or wood particles used in the production of wood composites. Though many aspects of these treatments are known, the fundamental influence of the process on product performance, the environment, and end of life scenarios remain relatively unknown. It is essential to integrate interactive assessment of process parameters, developed product properties, and environmental impacts. To optimize modification processing to minimize environmental impacts, much more information must be gathered about all process related factors affecting the environment. Wood modification represents an assortment of innovative processes currently being adopted in the wood protection sector or are at different stage of development (Fig. 1). These processes produces a material that can be disposed at the end of a product's life cycle without presenting any environmental hazards greater than those that are associated with the disposal of unmodified wood. 

Place, publisher, year, edition, pages
Sopron: , 2018
National Category
Wood Science Other Mechanical Engineering
Research subject
Wood Science and Engineering
Identifiers
urn:nbn:se:ltu:diva-71301 (URN)000474688100003 ()978-963-359-096-6 (ISBN)
Conference
8th Hardwood Conference on New Aspects of Hardwood Utilization - From Science To Technology,OCT 25-26, 2018, Sopron, HUNGARY
Available from: 2018-10-22 Created: 2018-10-22 Last updated: 2020-01-28Bibliographically approved
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