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An investigation to assess the feasibility of developing an accelerated laboratory test to determine the abrasion resistance of lesser-used timber species for use in marine constructio
2005 - IRG/WP 05-20317
The paper describes the evaluation of a laboratory-accelerated test to compare the shingle abrasion resistance of current and potential timbers for use in marine construction. Useful results were achieved in 47.5 hours, but identified a number of issues to be resolved for the test to be refined and the subsequent results to be interpreted correctly.
G S Sawyer, J R Williams


Investigation of the suitability of silver fir (Abies alba Mill.) for thermal modification
2004 - IRG/WP 04-40275
In this study the suitability of silver fir (Abies alba Mill.) was examined for thermal modification. Comparative experimental investigations were performed with silver fir and Norway spruce (Picea abies Karst.) after thermal treatments. Besides properties, which characterize the quality of heat treatments, like dimensional stability and resistance against fungal attack, strength properties of the heat treated material were tested, i.e. bending strength, modulus of elasticity (MOE), impact bending strength and resistance to abrasion. Silver fir was found to be slightly more suitable for thermal modification than spruce, when treated at 180 °C, whereas thermal modification at 220°C showed a comparable suitability for both species. Advantages of silver fir were found for its impact bending strength, durability, and formation of cracks after weathering.
C Brischke, A O Rapp


Effect of CCA and Tanalith E on the performance of surface finishing
2008 - IRG/WP 08-40405
Effect of CCA and Tanalith E treatment on the performance of surface finishing properties was the objectives of this study. Sapwood of scots pine, (Pinus sylvestris L.) and oriental beech (Fagus orientalis Lipsk.) specimens (300 x 100 x 15 mm along the grain) were impregnated with aqueous solution of CCA 2% and Tanalith E 2%. Surface roughness, dry film thickness, adhesion strength, gloss measurement, scratch and abrasion resistance were determined according to related standards for treated and untreated samples. Results indicated that surface roughness and adhesion strength depend on wood species and the chemical composition of preservatives. Wood preservatives did not affect the scratch resistance because it depends on properties of the coating. Treatments with CCA and Tanalith E affected only the abrasion test for beech samples. The highest gloss value was determined on untreated (control) pine samples while there was no clear difference on gloss values between CCA and Tanalith E treatment.
T Ozdemir, A Temiz, I Aydin


Assessment of the marine borer resistance and abrasion resistance of lesser known hardwood timber species for use in marine construction
2010 - IRG/WP 10-10711
Naturally durable species of timber are used as an alternative to preservative treated timber for marine structures, but many species have not been evaluated for their potential for use in this environment. EN 275 specifies a 5-year test period - too long a period for screening tests to be economically viable. In this study, candidate timber species were selected for testing both in the laboratory and in the sea to establish their resistance to marine borer and abrasion. Comparative resistance was assessed by comparing the rate of deterioration observed in candidate species of lesser known hardwoods against that for greenheart and ekki which were used as benchmark species. A number of lesser-known timber species originating from South America and West Africa performed comparatively well in laboratory tests and over an eighteen month exposure period in the sea. Resistance to marine borer attack did not necessarily correlate with resistance to abrasion.
J R Williams, G S Sawyer, G Malyon, S M Cragg, J D Icely, J Simm, M Meaden