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PDF :	02020069.pdf
title(En) :	The Variation of the Moisture Content and the Weight Loss of Wood in the Decay Durability Test.
author(En) :	Hirao Shimazono, Shoshiro Matsuoka
information :	Mokuzai Gakkaishi 2(2), 69-72 (1956)
assort :	Original Article
summary(En) :	In the case of testing decay durability of wood at the laboratory, it is very important to adjust the test condition in which the wood-destroying fungi can readily grow. Above all, the moisture content of wood is most important. In the present instance, the variation of the moisture content and the weight loss of wood blocks in the decay durability test were investigated in accordance with the Japanese Industrial Standard (JIS) original bill.    The wood used in this test were the sapwood (2×2×2 cm) of Beech (Fagus crenata), Sugi (Cryptomeria japonica) and Akamatsu (Pinus densiflora); the fungi were Poria vaporaria and Coriolus versicolor, and the medium was Beech sawdust (10 - 60 mesh) to which was added 1% glucose and 0.2% peptone and which was mixed with distilled water that was about half as much again of sawdust in weight.    After a week followed the inoculation of fungi: two test pieces were placed perpendicular on the surface of the culture medium in each culture vessel. After each 10, 20, 30, 45, 60, 90, 120, 150 and 180 days, four test pieces, tested to each wood species and of test fungi, were taken out from the culture vessels and their moisture content and weight losses examined.    The moisture content of wood increased suddenly about 10 days after fungal attack, but after that no particular change could be observed. So it seems that the moisture content had no influence on the weight loss (See. Fig. 2, 3 and 6).    The rate of weight loss was little at the first short time periods, then suddenly it became faster, and after that it slowly decreased. As for Poria vaporaria, the maximum of the rate was observed from 20 to 30 days after fungal attack, and the same in the case of Coriolus versicolor on Beech, but on Akamatsu and Sugi, it was observed about two months after (See. Fig. 4 and 5).    As mentioned above, in the case of comparing the decay durability of many species of wood with the one of Beech wood, which is used as a standard wood in the decay durability test of JIS, it seems that about two months is suitable for the duration of the test.