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Dense tropical hardwoods are commonly used in maritime and river structures because they have the necessary strength and display some required durability including good resistance to abrasion and to attack by marine borers. Owing to environmental concerns about the sustainability of forest products, responsible procurement regimes now require that...
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Context 1
... the perspective of the UK construction industry, the resulting use of a wider range of species would allow a more cost efficient use of timber in a wider range of applications, matching timber quality with need. Figure 2 presents an adapted overview of the selection process of hardwood timbers 12,8 . It identifies the various criteria for the timber to meet. ...
Citations
... This may however prove an advantage for solid timber. Indeed, high-density tropical species often benefit from high durability and resistance to marine borers (Dupray et al., 2009;Sen et al., 2009). ...
Timber construction has recently seen a significant regain of interest across a range of industries, owing to contemporary concerns for sustainability. In the marine industry, historic principles of traditional wooden boatbuilding remain present, with empirical rules still common practice, as is the case for scarf joints. Moreover, laminated wood is made more attractive and efficient thanks to modern adhesives. However, with the progress made in structural analysis, these assemblies can now be refined based on scientifically informed evidence. This paper employs destructive testing to tackle two distinct cases. On the one hand, the strength of plain scarf joints as a function of their slope is evaluated. On the other hand, the effectiveness of a range of adhesives is ascertained for the purpose of laminated manufacturing. The results are compared to both solid wood and the mechanical properties assumed by modern scantling regulations, revealing significant differences. The novel research findings provide a better understanding of these fundamental timber construction principles, supporting designers and builders alike in making informed choices while promoting safer regulatory compliance and enabling the future development of structural small craft standards. Applications beyond the structural design of wooden boats are also anticipated, for instance in sustainable buildings and architecture.
The paper describes refinements of rapid laboratory assessment of the mechanical performance of timbers used in the marine environment as regards their resistance to indentation, impact abrasion from smooth and sharp abrasives and to dynamic impact loads when wet. Ten tropical and home-grown hardwoods, five softwoods and a wood-polymer compound were examined. Brinell hardness, dynamic hardness, abrasion resistance, and the structural integrity in highenergy multiple impact tests were determined comparatively on dry and wet specimens. A trend was shown where softwoods show a decrease in abrasion resistance with wetting, whilst hardwoods did not. In dry conditions, impact abrasion using steel balls was higher than when using sharp grit. It is suggested that when wet, water in the cells has a hydraulic energy absorbing effect. ©2014 IWSc, the Wood Technology Society of the Institute of Materials, Minerals and Mining Received 31 January 2013.
