[논문]Characterization of Burned Architectural Woods by Fire Using SEM-EDXS and Computerized Tomography

Lee, Hyun-Mi; Hwang, Won-Joung; Lee, Dong-Heub; Son, Dong-Won

doi:10.5658/wood.2014.42.5.516

Characterization of Burned Architectural Woods by Fire Using SEM-EDXS and Computerized Tomography 원문보기

목재공학 = Journal of the Korean wood science and technology, v.42 no.5, 2014년, pp.516 - 522

Lee, Hyun-Mi (Department of Forest Products, Korea Forest Research Institute) , Hwang, Won-Joung (Department of Forest Products, Korea Forest Research Institute) , Lee, Dong-Heub (Department of Forest Products, Korea Forest Research Institute) , Son, Dong-Won (Department of Forest Products, Korea Forest Research Institute)

Abstract ▼ AI-Helper

Old architectural wood materials damaged by a fire were evaluated on the basis of wood species and scanning electron microscopy (SEM) observation of wood tissues in combination with energy dispersive X-ray spectroscopy (EDXS) analysis. Results of SEM observation showed that tracheid wall thickness of burned parts was very thin compared with undamaged and sound wood, and tylosoid in the resin canals disappeared after the exposure to fire. SEM-EDXS analysis indicated that carbon and oxygen peaks occurred in the original energy band, and the carbon peak was higher than that of the oxygen in the burned part. A computerized tomography was also undertaken to investigate the carbonization layer formed by fire and possible internal defects.

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제안 방법

In this study computed tomography was employed to measure wood defect, deterioration and decay for 17 Sungnyemun’s materials with tissue observation and component analysis to find the cause of failure.
This study was undertaken to investigate the carbonized layer and internal defects formed from fire of wood architecture by using CT and to observe material structure with the SEM. Furthermore components of the structures were measured by X-ray spectroscopy (EDXS).
X-rays were filmed at 5 second interval at 120 Kv, 110 mA. To judge the degree of deterioration of materials two dimensional images were obtained by taking photographs at 5 mm intervals along the length direction. Based on these data, material images including carbonization, static, knot and hardware, were compared with ultrasonic measurement results.

대상 데이터

The computerized tomography device, Toshiba Corporation’s X-peed TSX model, which is located in the Korea Forest Research Institute, was used.
This study used 2 materials, which were provided by MyongJi University Industry-Academic Collaboration Foundation (affiliated institutes, Korea Architecture Culture institutes).

성능/효과

In general with regard to the transverse phase, epithelial cells which surround tracheid arrangement, wall thickness, early wood⋅late wood’s implementation, longitudinal resin, were observed. In the radial section characteristics of tracheid pit shape, arrangement, and ray parenchyma cells and ray tracheids were found and in the tangential section, radial structure including width, height and transverse features were observed.
Among Sungnyemun’s materials, 2 materials were examined for their internal state by CT as a scientific method. The results showed that wood structure with decay not developing remained in a healthy state and that there was little difference from carbonization part and transfer moiety. On the other hand pit walls of tracheids and bordered pits from the transfer moiety was destroyed much more than in the healthy part in the burned part of radial section and tangential section.

참고문헌 (9)

Bak, S.J., Gang, A.G., Kim, Y.J. 1993. Species identification and microscope structure of ancient wood excavated from the remains (I) -Species of coffin woods excavated from ancient tombs. Journal of the Korean Society of Conservation Science for Cultural Properties 2(2): 3-14.
Davis, J., Wells. P. 1992. Computed tomography measurements on wood. Industrial Metrology 2(2-4): 195-218.

상세보기
Fujii, Y., Fujiwara, Y., Kigawa, R., Suda, T., Suzuki, Y. 2010. Characteristics and diagnosing technology of biodegradation in wooden historical buildings. A case study on Amida-do in Higashi Hongan-Ji Temple in Kyoto. World Conference on Timber Engineering. p. 8.
Gang, A.G., Bak, S.J. 1993. Species identification and microscope structure of ancient wood excavated from the remains (II) -Degradation of ancient woods. Journal of the Korean Society of Conservation Science for Cultural Properties 2(2): 15-24.
Jung, K.H., Park, S.J., Kang, A.K. 2002. Species identification of wooden materials attached to iron nails of Ancient Tombs excavated from Nung-san ri. Journal of The Korean Wood Science and Technology, 30(4): 17-22.
Kim, G.C., Bae, M.S., Lee, J.J. 2003. Difference of deterioration according to exposed condition of column in wooden traditional building. Journal of The Korean Wood Science and Technology, 31(2): 58-68.
Lee, H.H. 2008. A study on conservation treatment for excavated carbonization wooden object: Comparative experiment on the PEG method and sugar alcohol method. The Korea Society of Conservation Science for Cultural Properties 24: 57-66.
Lee, J.J., Kim, K.M. 2004. Development of portable CT system for detection of wood deterioration. The Architectural Institute of Korea 24(1): 391-394.
Lee, S.J. 2010. Quantitative detection of the internal defect in wooden members of ancient building throughout nondestructive evaluation with X-ray and ultrasound. Ph.D. Thesis. Seoul National University, Korea. pp. 20-40.

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