MOKUZAI HOZON (Wood Protection)
Online ISSN : 1884-0116
Print ISSN : 0287-9255
ISSN-L : 0287-9255
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Volume 31, Issue 5
Displaying 1-7 of 7 articles from this issue
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  • [title in Japanese]
    [in Japanese]
    2005 Volume 31 Issue 5 Pages 192-198
    Published: September 25, 2005
    Released on J-STAGE: May 22, 2009
    DOIhttps://doi.org/10.5990/jwpa.31.192
    JOURNAL FREE ACCESS
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  • Deterioration agents and service lives of sugi-wood civil engineering structures in Oita prefecture
    Shunji TSUSHIMA, Hiroshi KURISAKI, Masuo HASEGAWA
    2005 Volume 31 Issue 5 Pages 199-206
    Published: September 25, 2005
    Released on J-STAGE: May 22, 2009
    DOIhttps://doi.org/10.5990/jwpa.31.199
    JOURNAL FREE ACCESS
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    The cause of deterioration in 171 sugi-wood civil-engineering structures in Oita prefecture was investigated. Both the relation between the type of deterioration and its causal factors and a method for estimating the service lives of the wooden structures were examined.
    Wooden structures for civil engineering are classified into three types : assistant structures, decorative structures and permanent structures. Small-diameter logs are used for assistant structures, lumber or preservative-treated wood for permanent structures. The biological causes of the damage were wood-decay fungi and termites. If the durable limit value of the wood is 3.4 in the 0-5 scale of the deterioration evaluation system, with a mean value of 33 mm for the Pilodyn driving depth, and 70% unusable proportion for the wood, the service life of untreated wood is 6
    years and that of preservative-treated wood is 16 years, based on linear regression analysis between the limit values and the elapsed years. Using the multiple regression formula with a purpose variable for the average grade of damage, a formula for estimating service life is obtained for an estimated durable limit of 3.4 deterioration. The cause of deterioration in wooden protective fences was decay inside the surface cracks, and the bending strength of the damaged wood was clearly lower than that of unused one.
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  • [title in Japanese]
    [in Japanese], [in Japanese], [in Japanese]
    2005 Volume 31 Issue 5 Pages 207-213
    Published: September 25, 2005
    Released on J-STAGE: December 08, 2009
    DOIhttps://doi.org/10.5990/jwpa.31.207
    JOURNAL FREE ACCESS
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    Durability of heartwood of some varieties of asunaro (Thujopsis dorabrata) was investigated by using field stake tests at Asuka field test site in Nara prefecture. The installed woods were maate, suzuate and kusaate grown in Ishikawa prefecture, and hiba grown in Aomori prefecture.
    The stakes sized 30×30×600 (L) mm were set in the ground in an upright position with about half of their length. On the basis of inspection of biodegradation at ground line, the average service life of each variety was estimated as follows ; suzuate and kusaate, 4 years, maate, 5.5 or 6 years, hiba, 10 years.
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  • [title in Japanese]
    [in Japanese], [in Japanese]
    2005 Volume 31 Issue 5 Pages 214-218
    Published: September 25, 2005
    Released on J-STAGE: May 22, 2009
    DOIhttps://doi.org/10.5990/jwpa.31.214
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese]
    2005 Volume 31 Issue 5 Pages 219-224
    Published: September 25, 2005
    Released on J-STAGE: May 22, 2009
    DOIhttps://doi.org/10.5990/jwpa.31.219
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese]
    2005 Volume 31 Issue 5 Pages 225-229
    Published: September 25, 2005
    Released on J-STAGE: May 22, 2009
    DOIhttps://doi.org/10.5990/jwpa.31.225
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese], [in Japanese]
    2005 Volume 31 Issue 5 Pages 230-235
    Published: September 25, 2005
    Released on J-STAGE: May 22, 2009
    DOIhttps://doi.org/10.5990/jwpa.31.230
    JOURNAL FREE ACCESS
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