MOKUZAI HOZON (Wood Protection)
Online ISSN : 1884-0116
Print ISSN : 0287-9255
ISSN-L : 0287-9255
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Volume 43, Issue 3
Displaying 1-7 of 7 articles from this issue
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Review
Original Article
  • Decay resistance of wood stakes impregnated with preservatives containing copper（2）Properties of wood-decay and copper-resistance of basidiomycetous fungi isolated from the parts near the ground.
    Haruko SAKAI, Tomohiko KIYUNA, Shinya NINOMIYA
    2017 Volume 43 Issue 3 Pages 131-138
    Published: 2017
    Released on J-STAGE: August 01, 2017
    DOIhttps://doi.org/10.5990/jwpa.43.131
    JOURNAL FREE ACCESS
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    Six basidiomycetous fungi were isolated from sugi（ Cryptomeria japonica D. Don） stakes which were treated with copper-preservative and exposed at the field more than 13 years.Copper sulfate-treated sugi blocks were cultivated with these fungi for 12 weeks. After the fungal attack by Asuka N and Asuka J, 24％ and 51％ of the original copper was removed from the specimens although 8～18％ was by the others. And dark green substances were found at the surface of the specimens attacked by Asuka N and Asuka J. These results showed that Asuka N and Asuka J transferred a part of the copper from the inside of the specimen to the outside. These fungal transfer of copper might give the effect to the service life of stakes treated with copper-preservative.
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  • Identification of the substance responsible for whitening of the surface of wood posts set on foundation stones of traditional wooden buildings
    Asahi SATO, Yuko FUJIWARA, Masashi NAKAMURA, Yosei KOZUMA, Yoshihisa F ...
    2017 Volume 43 Issue 3 Pages 139-147
    Published: 2017
    Released on J-STAGE: August 01, 2017
    DOIhttps://doi.org/10.5990/jwpa.43.139
    JOURNAL FREE ACCESS
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    In Japanese traditional buildings, wood posts and lowermost horizontal beams are typically set on foundation stones. Surfaces of such posts and beams often develop whitish discoloration, spreading from the bottom side contacting the stones apparently where water becomes wicked. We conducted microscopic observations, whiteness measurement, and X-ray fluorescent, X-ray and X-ray diffraction analyses of the whitened wood surfaces obtained from four different buildings. Particles of several micrometers in diameter were observed on the surface of all specimens, and these particles densely covered the surface with high whiteness values. X-ray fluorescence and X-ray spectra of all the specimens showed strong peaks at energy ranges of the elements Ca, S, and O, especially surface whitening was conspicuous. Wood samples that had been kept indoors did not show these characteristics. X-ray diffraction spectra for samples from three buildings suggested that the white particles consist of CaSO4・2H2O.
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