Abstract
Over the past years, multiple fire accidents have been witnessed in ancient wooden buildings around the world, thereby causing major losses of cultural relics and social impact. Because of the damage of the ancient wood structure caused by the problem of aging, this enables its thermal conduction properties to change. For this reason, the way how the fire spread also changes. This study was based on the concept that the environmental characteristics of ancient building wood subjected to long-term natural aging, and so the artificially accelerated and alternate process of dry and wet aging method used for wood materials was determined. To that end, the common wood types of ancient buildings were selected as the research objects, so as to obtain the varying degrees of dry and wet aging wood materials. Furthermore, the characteristics of pores on the outer surface of aging wood materials were analyzed through the experiments conducted with a scanning electron microscope. Through the thermophysical property test, the variation law of thermophysical property parameters of aging wood materials with temperature was appraised, and the influence mechanism of the alternate process of dry–wet aging on the thermal conductivity of wood was revealed. The results demonstrated that the cell wall of wood underwent plastic deformation during the alternate process of dry and wet aging. Also, the local wood structure collapsed to different degrees, and so the surface tear degree increased. Because of the joint influence of the elastic stress and the mechanical adsorbed creep stress generated in the alternate process of dry and wet aging, the surface pore deformation of wood was periodic and dampened with the aging degree, so that the heat conduction properties of wood all manifested the change law of sinusoidal damping with the deepening of the aging degree. It is hoped that the research results could provide a theoretical basis for both the early prediction about and the accurate warning of fire spread in ancient wooden structures.
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Acknowledgements
This study was sponsored by the Young Elite Scientists Sponsorship Program of China Association for Science and Technology (Grant no. 2021QNRC001).
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Song, J., Deng, J., Zhao, J. et al. Influence mechanism of dry and wet alternate aging on thermal property characteristics of wood. J Therm Anal Calorim 148, 5111–5129 (2023). https://doi.org/10.1007/s10973-023-12015-5
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DOI: https://doi.org/10.1007/s10973-023-12015-5