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4 results on '"Densified timber"'

1. Densification of timber: a review on the process, material properties, and application

Author

John Paul Cabral, Bidur Kafle, Mahbube Subhani, Johannes Reiner, and Mahmud Ashraf

Subjects
Chemical densification, Compression, Densification, Densified timber, Mechanical densification, Sustainability, Forestry, SD1-669.5, Building construction, TH1-9745
Abstract

Abstract Timber densification is a process that has been around since the early 1900s and is predominantly used to enhance the structural properties of timber. The process of densification provides the timber with a greater mechanical strength, hardness, abrasion resistance, and dimensional stability in comparison to its virgin counterparts. It alters the cellular structure of the timber through compression, chemical impregnation, or the combination of the two. This in turn closes the voids of the timber or fills the porosity of the cell wall structure, increasing the density of the timber and, therefore, changing its properties. Several processes are reported in literature which produce densified timber, considering the effect of various parameters, such as the compression ratio, and the temperature on the mechanical properties of the densified timber. This paper presents an overview of the current processes of timber densification and its corresponding effects. The material properties of densified timber, applications, and possible future directions are also explored, as the potential of this innovative material is still not fully realised.

Published
2022
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2. Densification of timber: a review on the process, material properties, and application.

Author

Cabral, John Paul, Kafle, Bidur, Subhani, Mahbube, Reiner, Johannes, and Ashraf, Mahmud

Abstract

Timber densification is a process that has been around since the early 1900s and is predominantly used to enhance the structural properties of timber. The process of densification provides the timber with a greater mechanical strength, hardness, abrasion resistance, and dimensional stability in comparison to its virgin counterparts. It alters the cellular structure of the timber through compression, chemical impregnation, or the combination of the two. This in turn closes the voids of the timber or fills the porosity of the cell wall structure, increasing the density of the timber and, therefore, changing its properties. Several processes are reported in literature which produce densified timber, considering the effect of various parameters, such as the compression ratio, and the temperature on the mechanical properties of the densified timber. This paper presents an overview of the current processes of timber densification and its corresponding effects. The material properties of densified timber, applications, and possible future directions are also explored, as the potential of this innovative material is still not fully realised. [ABSTRACT FROM AUTHOR]

Published
2022
Full Text
View/download PDF

3. Densification of timber: a review on the process, material properties, and application

Author

Cabral, JP, Kafle, Bidur, Subhani, Mahbube, Reiner, Johannes, Ashraf, Mahmud, Cabral, JP, Kafle, Bidur, Subhani, Mahbube, Reiner, Johannes, and Ashraf, Mahmud

Abstract

AbstractTimber densification is a process that has been around since the early 1900s and is predominantly used to enhance the structural properties of timber. The process of densification provides the timber with a greater mechanical strength, hardness, abrasion resistance, and dimensional stability in comparison to its virgin counterparts. It alters the cellular structure of the timber through compression, chemical impregnation, or the combination of the two. This in turn closes the voids of the timber or fills the porosity of the cell wall structure, increasing the density of the timber and, therefore, changing its properties. Several processes are reported in literature which produce densified timber, considering the effect of various parameters, such as the compression ratio, and the temperature on the mechanical properties of the densified timber. This paper presents an overview of the current processes of timber densification and its corresponding effects. The material properties of densified timber, applications, and possible future directions are also explored, as the potential of this innovative material is still not fully realised.

Published
2022

4. Fire structural performance of thermo-mechanically compressed spruce timber by means experiments and a three-step multi-reactions pyrolysis 3D-finite element modelling

Author

Tran, T.T., Thi, V.-D., Oudjene, M., Khelifa, M., Girods, P., Debal, Matthieu, Rogaume, Y., Jannot, Yves, Laboratoire Énergies et Mécanique Théorique et Appliquée (LEMTA ), Université de Lorraine (UL)-Centre National de la Recherche Scientifique (CNRS), Laboratoire d'Etude et de Recherche sur le Matériau Bois (LERMAB), Université de Lorraine (UL), Thuyloi University, Université Laval [Québec] (ULaval), The funding provided by the European Regional Development Fund (ERDF) via Interreg NWE grant 348 'Towards Adhesive Free Timber Buildings', AFTB, and European Project: ERDF

Subjects
020209 energy, Thermal behaviour, Charring, Densified timber, 020101 civil engineering, Timber, 02 engineering and technology, Building and Construction, 0201 civil engineering, [SPI]Engineering Sciences [physics], 0202 electrical engineering, electronic engineering, information engineering, FEM Pyrolysis, General Materials Science, Fire resistance, Civil and Structural Engineering
Abstract

International audience; This paper presents experimental and numerical investigations to access the relative fire structural resistance of thermo-mechanically compressed (or densified) spruce wood. First of all, thermal characterization, including thermal conductivity and specific heat, has been undertaken on both compressed and uncompressed spruce wood. The thermal degradation of both compressed and uncompressed wood has been analysed by means thermogravimetric tests using different heating rates. Both compressed and uncompressed spruce samples of dimensions of 100 mm × 100 mm × 19 mm have been subjected to fire in a cone calorimeter under 20 kW/m2 and 75 kW/m2. Finally, a predictive finite element model based on three-step multi-reactions of pyrolysis is proposed for the thermal transfer and degradation analyses of timber material. The simulated thermal profiles, the mass loss as well as the charring depths were compared to the experimentally recorded results showing a fairly good agreement.

Published
2022

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