文献类型：期刊文献

英文题名：Nanomechanical and Topochemical Changes in Elm Wood from Ancient Timber Constructions in Relation to Natural Aging

作者：Han, Liuyang[1] Wang, Kun[2] Wang, Weibin[3] Guo, Juan[1] Zhou, Haibin[1]

第一作者：Han, Liuyang

通信作者：Zhou, HB[1]

机构：[1]Chinese Acad Forestry, Res Inst Wood Ind, Beijing 100091, Peoples R China;[2]Beijing Forestry Univ, Coll Mat Sci & Technol, Beijing 100083, Peoples R China;[3]Shanxi Ancient Bldg Maintenance Qual Supervis Stn, Taiyuan 030001, Shanxi, Peoples R China

年份：2019

卷号：12

期号：5

外文期刊名：MATERIALS

收录：;EI(收录号：20192507072228);Scopus(收录号：2-s2.0-85067339551);WOS:【SCI-EXPANDED(收录号:WOS:000462543700102)】；

基金：This research was funded by the National Key R and D Project (No. 2018YFD0600303).

语种：英文

外文关键词：timber buildings; aged wood; nanoindentation (NI); Raman spectra

摘要：Knowledge of properties of building materials affected by aging is of great importance to conserve cultural heritages or replace their biopolymer components. The objective of the study was to investigate the chemical characterization change in the biopolymer components and identify whether these changes are correlated with alterations in the nanomechanical properties of the wood cell wall bio-composites in relation to natural aging. The effects of natural aging on the elm (Ulmus) wood component (dated from 1642 to 1681) of Chenghuang Temple, an ancient timber construction in China were investigated to understand the chemical and mechanical changes in the wood cell wall. Especially, confocal Raman microscopy and nanoindentation (NI) were used to track changes in the chemical structure and nanomechanical properties. The results showed that the morphological, chemical and physical properties of cell walls changed with aging. After aging, the cell structure showed evidential alternations, and the wood components, especially hemicellulose and lignin, were degraded, leading to deterioration of mechanical properties of aged wood compared with normal wood. Morphology deterioration and micromechanical changes only occurred on the surface with the depth of about 3.6 mm of the aged element. This study would be helpful to provide practical guidance for protecting the apparent performance of ancient timber structures.