Study on the degradation factor of wood in brackish waters

• Published in: MOKUZAI HOZON (Wood Protection) Vol. 43; no. 1; pp. 2 - 12
• Main Authors: MIMURA, Kaori, HARA, Tadashi, KATO, Hideo, HONDA, Kenji, NAKAUCHI, Takuya
• Format: Journal Article
• Language: English
• Published: JAPAN WOOD PRESERVING ASSOCIATION 2017
• Subjects: sea level variation, tree groyne, soundness
• ISSN: 0287-9255; 1884-0116
• DOI: 10.5990/jwpa.43.2

In recent years, toward the solution of worsening environmental problems, sustainable town development is also sought in the civil engineering field. Under such circumstances, the soft ground measures that used a lot of logs are expected from both sides of the disaster prevention and global warming mitigation. In order to expand the use of soil stabilization, we need to verify the unclear long-term stability of wood installed inside the ground, however there are not many studies about it. In this study, we examine the soundness interms of state of rotting of tree groynes installed underground for periods as long as 20years. We examine both visually as well as using the Pilodyn test, focus to the differences in the installation environment. Our results show that for the ground region of high water permeability where there is tide level fluctuation, it is clear that the installed wood in underground is suffered rot and insect damage. On the other hand, it is also seen that under similar conditions, the installed wood in underground is not suffered rot or insect damage in sections of permanently saturated soil capillary action, and also the soundness of the structures can be maintained over long periods of time.