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Tensile properties of finger-jointed lumber under high-temperature and oxygen-free conditions

  • Kong Yue ORCID logo EMAIL logo , Feng Wang , Weidong Lu , Zhongqiu Tang , Zhangjing Chen and Weiqing Liu
Published/Copyright: January 28, 2021
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Holzforschung
From the journal Holzforschung Volume 75 Issue 9

Abstract

A model for engineered wood was developed that considers the parallel-to-grain tensile strength of finger-jointed lumber at high temperatures relevant to fire conditions. The finger-jointed lumber was composed of Douglas fir, larch, and poplar wood with phenol-resorcinol-formaldehyde (PRF) as an adhesive. The tensile properties of the finger-jointed lumber were evaluated at high temperatures under oxygen-free conditions, i.e. in a nitrogen atmosphere. A combination of chemical and thermal-physical property analysis of the PRF adhesive and microscopic observations on the glueline was used to discuss the reduction of tensile strength of the parallel-to-grain finger-jointed lumber at variable temperature. The results show that the tensile strength of the finger-jointed lumber decreased linearly with increasing temperature. The parallel-to-grain tensile strength of the PRF finger-jointed samples at 20 and 280 °C were 84 and 5% of the tensile strength of the solid wood at 20 °C, respectively. The thermal-physical properties and scanning electron microscopy analysis revealed that the pyrolysis intensity of the PRF adhesive was lower than that of the wood at 220 °C or higher.

Keywords: elevated temperature; finger joints; nitrogen condition; parallel-to-grain tensile strength
Corresponding author: Kong Yue, College of Civil Engineering, Nanjing Tech University, Nanjing 211800, P. R. China, E-mail:

Funding source: National Key Research and Development Program of China

Award Identifier / Grant number: 2019YFD1101001

Funding source: National Natural Science Foundation of China

Award Identifier / Grant number: 51978331

  1. Author contribution: Conceptualization, K.Y. and W.L.; methodology, formal analysis, writing, original draft preparation, funding acquisition, K.Y.; investigation, F.W. and Z.T.; and writing, review, and editing, Z.C.

  2. Research funding: The research was funded by National Key Research and Development Program of China (Grant No. 2019YFD1101001), and National Natural Science Foundation of China (Grant No. 51978331).

  3. Conflict of interest statement: The authors declare no conflicts of interest regarding this article.

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Received: 2020-03-09
Accepted: 2020-12-17
Published Online: 2021-01-28
Published in Print: 2021-09-27

© 2021 Walter de Gruyter GmbH, Berlin/Boston

Articles in the same Issue

  1. Frontmatter
  2. Original articles
  3. Specific heat capacity of wood between −140 and 50 °C in dry and wet state
  4. Growth behavior of wood-destroying fungi in chemically modified wood: wood degradation and translocation of nitrogen compounds
  5. Characterisation of compound middle lamella isolated by a combination of wet-beating, sedimentation, and methanol dialysis
  6. Review
  7. A review of lignin hydrogen peroxide oxidation chemistry with emphasis on aromatic aldehydes and acids
  8. Original articles
  9. Fibre development in an intensified mechanical pulping process
  10. Tensile properties of finger-jointed lumber under high-temperature and oxygen-free conditions
  11. Predicting strength of Finnish birch veneers based on three different failure criteria
  12. Non-fluorine surface modification of acetylated birch for improved water repellence
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https://doi.org/10.1515/hf-2020-0066
Keywords for this article
elevated temperature; finger joints; nitrogen condition; parallel-to-grain tensile strength

Articles in the same Issue

  1. Frontmatter
  2. Original articles
  3. Specific heat capacity of wood between −140 and 50 °C in dry and wet state
  4. Growth behavior of wood-destroying fungi in chemically modified wood: wood degradation and translocation of nitrogen compounds
  5. Characterisation of compound middle lamella isolated by a combination of wet-beating, sedimentation, and methanol dialysis
  6. Review
  7. A review of lignin hydrogen peroxide oxidation chemistry with emphasis on aromatic aldehydes and acids
  8. Original articles
  9. Fibre development in an intensified mechanical pulping process
  10. Tensile properties of finger-jointed lumber under high-temperature and oxygen-free conditions
  11. Predicting strength of Finnish birch veneers based on three different failure criteria
  12. Non-fluorine surface modification of acetylated birch for improved water repellence
  13. Ultrasonic cavitation driven fabrication of organic solvent free lignin/prochloraz nano capsules to promote resistance to photolysis and rain wash, and provide extended release performance
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