HUBUNGAN KETAHANAN KAYU TERHADAP JAMUR DENGAN KERAPATAN DAN PENGKARATAN LOGAM
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Abstract
Wood constructions are mostly fastened by metal screw or metal fastener, then corrosion resistance is an important
factor. Wood natural durability against fungus and its relation to basic density are two other factors affecting wood
quality for construction. This paper studies wood natural durability against fungus and metal corrosion in relation to
density of five Riau wood species. Wood samples were tested against fungus using the Kolle-flask method and wood
density was measured based on DIN-2135-1975 standard. Result shows that Diospyros korthalsiana wood was
categorized as non-resistant (class IV), Tetramerista glabra wood was classified as moderately resistant (class III),
while Shorea teysmanniana, Palaquium burckii, and Aglaia argentea woods are grouped into resistant wood
(class II). In all wood species, weight lost of heartwood is lower than that of sapwood, but in the same durability
group (moderately resistant). In general, there is a relationship between density and weight loss. The higher the wood
density is the lower the weight loss. The average of weight loss of metal screwed wood is higher than wood without
screws. The highest weight loss was recorded from Palaquium burckii wood which was screwed and exposed to
Polyporus sp., while, the highest screw weight loss was recorded from Shorea teysmanniana wood exposed to
Pycnoporus sanguineus. Rustic enamel was highly recorded from Tetramerista glabra wood, which was exposed
into Tyromyces palustris. Eight species of fungus are moderate and two species are low in capability of decaying
wood. The highest decaying ability in corroding metal screws is found in P. sanguineus. The weight of rustic enamel
found in the metal screw caused by four fungus activity of (Chaetomium globosum, P. sanguineus, S. commune
and T. palustris) was relatively similar.
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