Durability evaluation of natural-durable wood species by a fungus cellar test

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  • 高耐朽性樹種のファンガスセラー試験による耐朽性評価
  • コウ タイキュウセイ ジュシュ ノ ファンガス セラー シケン ニ ヨル タイキュウセイ ヒョウカ

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Abstract

The fungus cellar test is one of the Japanese standardized methods to evaluate durability of preservative-treated wood against wood rotting fungi. The test is useful to obtain practical results in shorter term than field test.<BR>Durability of natural-durable wood species was evaluated with this method. In addition, it was also estimated by periodical and continuous mass loss determination of the samples exposed to the fungus cellar test.<BR>The result showed that the tested natural-durable wood species have high fungal and termites resistance. However, there were some differences in durability among wood species. For example, Ipe (Tabebuia spp.) and Brauna (Melanoxylon brauna) were durable, while Cabriuva (Myroxy-lon balsamum) and Jarrah (Eucailptus marginata) were less durable. Some Hinoki (Camaecyparis obtusa) showed similar durability to Sugi (Cryptomeria japonica). This result suggests Hinoki should require preservative treatments as well as Sugi in case of practical use as structural mem-bers. The results from this test proved that the percentages of mass loss are useful index for assessing durability in the fungus cellar test. This report indicated that the fungus cellar test using two indi-ces, namely the current visual indices and the mass loss (%), offered more detailed information on damage by fungal decay.

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