Startseite Experimental investigation on the effect of accelerated ageing conditions on the pull-out capacity of compressed wood and hardwood dowel type fasteners
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Experimental investigation on the effect of accelerated ageing conditions on the pull-out capacity of compressed wood and hardwood dowel type fasteners

  • Sameer Mehra ORCID logo , Annette M. Harte ORCID logo , Adeayo Sotayo , Zhongwei Guan und Conan O’Ceallaigh ORCID logo EMAIL logo
Veröffentlicht/Copyright: 15. November 2021
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Abstract

The widespread use of adhesives in timber construction has negative implications for the end-of-life disposal or re-use of the structural timber components. To promote the circular bioeconomy, it is preferable to substitute adhesives with more sustainable alternatives such as wood-based connectors. Today, robotic fabrication technologies facilitate the development of dowel-laminated timber (DLT) products whereby hardwood dowels are used to connect timber laminates as a substitute to adhesives. In recent years, thermo-mechanical densification of wood has resulted in significant improvements in the mechanical performance of the wood. This modified product often termed compressed wood (CW) has a shape-recovery effect which may be beneficial for the development of DLT products and timber-timber connections with improved friction fit with time. To test the hypothesis, accelerated ageing tests were carried out on CW-timber and hardwood-timber dowel type connections subjected to variable climate conditions. Finally, the capacity of the connections or friction fit was assessed using pull-out tests. Results show that the shape-recovery effect leads to the continuous expansion of the CW dowels and facilitates a friction fit with the timber substrate yielding higher pull-out loads when compared to hardwood dowels.


Corresponding author: Conan O’Ceallaigh, Timber Engineering Research Group and Ryan Institute, College of Science & Engineering, National University of Ireland Galway, Galway, Ireland, E-mail:

Funding source: Interreg NWE

Award Identifier / Grant number: Interreg North-West Europe grant 348

Acknowledgements

The contribution of the technical staff of the College of Science and Engineering, NUI Galway, in particular, Peter Fahy and Colm Walsh are gratefully acknowledged.

  1. Author contributions: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.

  2. Research funding: The study was conducted within the framework of the project “Towards Adhesive Free Timber Buildings – AFTB” at the College of Science & Engineering, National University of Ireland Galway, Ireland. The AFTB project is funded by the European Regional Development Fund (ERDF) via Interreg North-West Europe grant 348.

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

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Received: 2021-05-21
Accepted: 2021-10-03
Published Online: 2021-11-15
Published in Print: 2022-01-27

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