Experimental Study on Restoration of Deteriorated Timber due to Termites by Resin Filling

Abstract:

There are many valuable wooden buildings in the world, because timber has been used all over the world as a building material for a long time. However, there is an issue that timber deteriorates due to various factors. Therefore, in order to preserve these valuable wooden buildings, it is necessary to appropriately repair or reinforce treatment. One of the treatments is the resin filling method. In this method, filling the resin in order to restore the strength into an internal cavity caused by deterioration. It has become clear that it is possible to recover the strength using this method, however, we are still conducting construction based on the rule of thumb. Therefore, authors examined the resin characteristics in order to inject the resin in stable manner and ensure strength recovery. Authors focused on deteriorated timber due to termites, because Japan has a very high amount of such type of timber. Authors reports the following four aspects of the characteristics of resin filling into timber. 1. The Area velocity is determined by the injection pressure, width of the gap, and viscosity of the resin. 2. The resin spreads concentrically in the gap of wood, but there is no regularity in the random gap like deteriorated timber due to termites. 3. Authors proposed a new coefficient for the application, of a theoretical formula to deteriorated timber due to termites. 4. Authors proposed a flowchart of resin filling method to perform stable construction.

• Periodical: Construction Technologies and Architecture (Volume 1)
• Pages: 85-94
• DOI: https://doi.org/10.4028/www.scientific.net/CTA.1.85
• Online since: January 2022
• Authors: Takashi Yajima*, Kei-ichi Imamoto, Chizuru Kiyohara, Mikako Yamada
• Keywords: Epoxy Resin, Internal Deterioration, Resin Filling, Termites, Wood

References

[1] [Goromaru Syuhei et al. 2018] Goromaru, S.; Minamikawa, T.; Imamoto, K.; Kiyohara, C.; A proposal of method for searching defect and improvement in compressive strength with resin of internally deteriorated existing wooden building. Architectural Institute of Japan, 2018, 45-48.

[2] [Yamada Mikako et al. 2019] Yamada, M.; Sawada, M.; Imamoto, K.; Kiyohara, C.; Ohtsuka, A.; Sasaki, S.; Terasaki, S.; Fundamental study on strengthening of termite induced deteriorated timber member with resin. No.1 Compression test and bending test. Architectural Institute of Japan, 2019, 821-822.

[3] [Sawada Masamitsu et al. 2019] Sawada, M.; Yamada, M.; Imamoto, K.; Kiyohara, C.; Ohtsuka, A.; Sasaki, S.; Terasaki, S.; Fundamental study on strengthening of termite induced deteriorated timber member with resin. No.2 Bending shear test. Architectural Institute of Japan, 2019, 823-824.

[4] [Kitsutaka Yoshinori et al. 1988] Kitsutaka, Y.; Kamimura, K.; Konishi, T.; Study on resin grouting for the vacant space under reinforcement of the reinforce concrete. Architectural Institute of Japan, 1988, 181-182.

[5] [Seno Yasuhiro et al. 2008] Seno, Y.; Takeo, U.; An Experimental Study on the Factors Affecting Injection Properties during Concrete Crack Repair. Concrete Research and Technology, 2008, Vol.19, No.1, 11-20.

DOI: 10.3151/crt1990.19.1_11

[6] [Mohri Satoshi et al. 2015] Mohri, S.; Ohkubo, T.; Evaluation technology on injection behavior for concrete crack repair with visualized specimens. AIJ J. Technol. Des, 2015, Vol.21, No.47, 29-34.

DOI: 10.3130/aijt.21.29