Investigation of the effect of modified poly vinyl acetate on the stress carrying capacity of corner joints in the wood members joined with dowel

Document Type : Research Paper

Authors

1 Ph.D. Student, Department of wood and paper science and technology, Faculty of natural resources, University of Tehran, Karaj, Iran

2 Professor, Department of wood and paper science and technology, Faculty of natural resources, University of Tehran, Karaj, Iran

3 Associate Prof., Department of wood and paper science and technology, Faculty of natural resources, University of Tehran, Karaj, Iran

4 Assistant Prof., Department of wood and paper science and technology, Faculty of natural resources, University of Tehran, Karaj, Iran

Abstract

Abstract
The aim of this study was to determine stress carrying capacity of doweled corner joints in wood members made with modified resin (polyvinyl acetate) and its comparison with unmodified ones. Joint members were out of European silver Fir (Abies alba) and dowels were made from Beech and poplar woods as variables in this study. Diameter of dowel had three levels in size, namely 6, 8 and 10 mm. The experimental joints were tested under diagonal compression loads. Results have shown that stress carrying capacity of tested joints made with modified glue is more than unmodified ones. Maximum stress capacity was observed in the joints of beech which with 10 mm in diameter dowels. Based on the results, the highest strength was belonging to those joints made with beech wood glued with modified resin containing 10 mm dowel. Furthermore, the lowest strength was belonging to poplar joints made with unmodified resins and 6 mm dowels. The improvement can be due to increased viscosity and controlled penetration of the resin into the wood structure and hence better bonding. Concerning the wood species, beech had the highest stress carrying capacity that it can attributed to its higher density.
Key words: Stress carrying capacity, wooden dowel, modified PVAc, dowel.

Keywords

Main Subjects

References

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Iranian Journal of Wood and Paper Industries
Volume 9, Issue 3
December 2018
Pages 323-336

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