EVALUATION OF WOODEN MATERIALS DETERIORATED BY MARINE-WOOD BORING ORGANISMS IN THE BLACK SEA

H. Sivrikaya, H. Hafizoglu, S.M. Cragg, A. Carrillo, H. Militz, C. Mai, L.M.S. Borges

Abstract


Marine borers can destroy wooden structures exposed to the marine environment and causegreat monetary loss. In the region of Amasra of the Black Sea in Turkey, ships continue to be builtfrom wood, mainly Castanea sativa (sweet chestnut) and Quercus petraea (sessile oak) and thereforeare subject to destruction by marine borers. Copper-chromium-arsenic (CCA), used to be one of themost common wood preservatives used in Turkey. However, in this area its e cacy against marineborers is unknown. e resistance of untreated and CCA-treated samples of chestnut, oak andScots pine (Pinus sylvestris) was examined and a er twelve months evaluated in two ways, EN 275,and a non-destructive measurement for dynamic modulus of elasticity (MOE). Untreated samples,particularly Scots pine were severely attacked by Teredo navalis. Treated samples of oak and chestnutwere moderately attacked while treated samples of Scots pine sapwood and heartwood were sound.Severity of wood boring attack determined using MOE showed a very good correlation with that determinedby visual assessment in untreated wood, and a good correlation for treated wood. DynamicMOE allows rapid on-site evaluation rather than measurements within a laboratory and also withoutcausing damage to the structures being evaluated.

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