Wood Science and Technology最新文献_第6页

An alternative approach for conditioning wood samples in nuclear magnetic resonance studies 在核磁共振研究中调节木材样本的另一种方法

IF 3.1 2区农林科学

Wood Science and Technology Pub Date : 2024-07-16 DOI: 10.1007/s00226-024-01576-9

Jingbo Shi, Luxiao Qian, Zishu Wang, Jiajun Ji, Chenyang Cai, Liping Cai, Jianxiong Lyu, Stavros Avramidis

{"title":"An alternative approach for conditioning wood samples in nuclear magnetic resonance studies","authors":"Jingbo Shi, Luxiao Qian, Zishu Wang, Jiajun Ji, Chenyang Cai, Liping Cai, Jianxiong Lyu, Stavros Avramidis","doi":"10.1007/s00226-024-01576-9","DOIUrl":"10.1007/s00226-024-01576-9","url":null,"abstract":"<div><p>A significant challenge in applying nuclear magnetic resonance (NMR) in examining the wood-water system is accurately and effectively conditioning wood samples before such tests. The common approaches, such as the saturated salt solution method, have drawbacks of long equilibrium time and significant moisture content deviations. The water-addition-equilibrium method proposed here is an alternative conditioning approach that adds liquid water directly to oven-dried samples following sealing and equilibrating at 45 ℃ for 72 h until obtaining the even water distribution in samples. The equilibrium time in the latter method was determined by analyzing evolutions of the spin-spin relaxation time (<span>(:{T}_{2})</span>) spectra with five equilibrium time durations, i.e., 0, 24, 48, 72 and 96 h. Compared with the salt solution method, it is much easier and faster to achieve target moisture content using the water-addition method. When the actual target moisture of the samples is similar, no apparent differences are observed between the <span>(:{T}_{2})</span> spectra obtained using the two methods. For this study, the water-addition method was applied to poplar samples with the moisture content target of 32% and below. The proposed method may be applied to other wood species and is expected to contribute to NMR examinations where the accurate and continuous control of sample moisture is required.</p></div>","PeriodicalId":810,"journal":{"name":"Wood Science and Technology","volume":"58 4","pages":"1409 - 1425"},"PeriodicalIF":3.1,"publicationDate":"2024-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141641319","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Research on stress relaxation behavior of confined Chinese fir subjected to compression 受压密闭冷杉的应力松弛行为研究

IF 3.1 2区农林科学

Wood Science and Technology Pub Date : 2024-07-10 DOI: 10.1007/s00226-024-01572-z

Xiaowei Li, Lidan Pang, Zhengchao Xian, Zhaoqiang Zhang, Xiaolong Dai

{"title":"Research on stress relaxation behavior of confined Chinese fir subjected to compression","authors":"Xiaowei Li, Lidan Pang, Zhengchao Xian, Zhaoqiang Zhang, Xiaolong Dai","doi":"10.1007/s00226-024-01572-z","DOIUrl":"10.1007/s00226-024-01572-z","url":null,"abstract":"<div><p>The anchorage system can enhance the bending resistance and initial stiffness of timber structure joints. The system applies pressure through squeezing plates and a surrounding steel tube, compressing the enclosed wood significantly. However, if the wood within the anchoring steel tube experiences stress relaxation, it will gradually diminish the force-transfer capacity of the anchorage system over time. In order to quantify the stress relaxation occurred in the confined wood, specimens of 54 were fabricated and compressed under lateral constraints. During the testing process, six fixed temperatures and three distinct compression ratios were taken into account. Thereafter, the evolution of relaxation modulus was discussed according to various temperatures and compression ratios. A linearized Arrhenius equation was proposed and used to determine the parameters of the Arrhenius equation based on the time–temperature superposition principle and experimental data obtained. Besides, the relationship between the compression ratio and the parameters of Arrhenius equation was formulized and the relaxation modulus and relaxation times were presented for five-element general Maxwell model. The results indicate that the stress relaxation behavior of fir wood is closely related to temperature, time, and compression ratio. The relationship between the horizontal shift factor and temperature follows the Arrhenius equation. Additionally, the five-element Maxwell model obtained can be used to predict stress relaxation behavior of confined Chinese fir.</p></div>","PeriodicalId":810,"journal":{"name":"Wood Science and Technology","volume":"58 4","pages":"1381 - 1408"},"PeriodicalIF":3.1,"publicationDate":"2024-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141586604","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Doubling genome size of energy willow affects woody stem cell wall structure, chemistry, and biogas yield 能量柳基因组大小增加一倍会影响木质茎细胞壁结构、化学性质和沼气产量

IF 3.1 2区农林科学

Wood Science and Technology Pub Date : 2024-07-03 DOI: 10.1007/s00226-024-01567-w

Ksenija Radotić, Jasmina Popović, Katarina Vojisavljević, Dušica Janošević, Jasna Simonović Radosavljević, Svetlana Butulija, Branko Matović, Dragosav Mutavdžić, Csilla Szűcs, András Cseri, Dénes Dudits, Kornél L. Kovács, Aleksandra Lj. Mitrović

{"title":"Doubling genome size of energy willow affects woody stem cell wall structure, chemistry, and biogas yield","authors":"Ksenija Radotić, Jasmina Popović, Katarina Vojisavljević, Dušica Janošević, Jasna Simonović Radosavljević, Svetlana Butulija, Branko Matović, Dragosav Mutavdžić, Csilla Szűcs, András Cseri, Dénes Dudits, Kornél L. Kovács, Aleksandra Lj. Mitrović","doi":"10.1007/s00226-024-01567-w","DOIUrl":"10.1007/s00226-024-01567-w","url":null,"abstract":"<div><p>Effectiveness in woody biomass utilization is highly dependent on its genetics and physiology. We performed morpho-anatomical, chemical, and biomethane productivity characterizations of one-year-old woody stems in three shrub <i>Salix viminalis</i> genotypes: a diploid (Energo) and its two autotetraploid derivatives (PP-E7 and PP-E13). Tetraploidization affected changes in stem morpho-anatomy and corresponding improved chemical features and biomethane productivity, considerably more pronounced in tetraploid PP-E13, while PP-E7 was more similar to diploid Energo. Compared to diploid Energo, in tetraploid PP-E13 morphometric analysis showed increased stem diameter and higher wood fiber radial double wall thickness, while microscopic analysis suggested higher syringyl to guaiacyl (S:G) ratio of the wood fiber cell wall. Presented changes in stem morpho-anatomy of tetraploid PP-E13 compared to diploid Energo correspond to the improved chemical features: the lower Klason lignin content and higher S:G ratio, the higher cellulose and xylan content, and lower cellulose crystallinity (Crl). Presented improved chemical features, along with the increase in ash content, resulted in a 7.3% (10.3 CH<sub>4</sub> mL/g VS) increase in biomethane productivity in tetraploid PP-E13, compared to diploid Energo, suggesting tetraploid PP-E13 as an optimal raw material for fermentation technologies. In addition, besides the well-known chemical markers of willow biomass quality, the presented results highlight key stem morpho-anatomical parameters, which can serve as additional markers in energy willow improvement.</p></div>","PeriodicalId":810,"journal":{"name":"Wood Science and Technology","volume":"58 4","pages":"1353 - 1379"},"PeriodicalIF":3.1,"publicationDate":"2024-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141503935","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A multi-scale modelling strategy to determine the effective elastic properties of Pinus pinaster (Ait.) accounting for variability 采用多尺度建模策略确定松柏（Ait.）

IF 3.1 2区农林科学

Wood Science and Technology Pub Date : 2024-07-02 DOI: 10.1007/s00226-024-01559-w

Romain Chevalier, Marco Montemurro, Régis Pommier, Anita Catapano

{"title":"A multi-scale modelling strategy to determine the effective elastic properties of Pinus pinaster (Ait.) accounting for variability","authors":"Romain Chevalier, Marco Montemurro, Régis Pommier, Anita Catapano","doi":"10.1007/s00226-024-01559-w","DOIUrl":"10.1007/s00226-024-01559-w","url":null,"abstract":"<div><p>Multi-scale numerical homogenisation strategies have been used in the recent years to efficiently compute the effective elastic properties of heterogeneous materials. Coupled with a stochastic approach, they can be applied to natural material such as wood to take into account the variability of their properties. In the case of <i>Pinus pinaster</i> (Ait.), available elastic properties are based on those of generic softwood species due to a lack of data in the literature, reducing the overall precision of the results. This paper proposes an efficient numerical framework based on both a general numerical homogenisation method and the well-known Monte Carlo approach to determine the equivalent elastic properties at the macroscopic scale, with the associated variability, of the <i>Pinus pinaster</i> (Ait.) species. The coherence of the numerical model is established by comparison with analytical and experimental results available in the literature. The obtained results reveal very good accuracy in terms of equivalent elastic properties with a macroscopic behaviour characterised by an orthotropic symmetry. Moreover, the influence of the distance from the pith on the equivalent macroscopic elastic response is highlighted.</p></div>","PeriodicalId":810,"journal":{"name":"Wood Science and Technology","volume":"58 4","pages":"1323 - 1352"},"PeriodicalIF":3.1,"publicationDate":"2024-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141503934","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Scale modeling of thermo-structural fire tests of multi-orientation wood laminates 多方向木质层压板热结构火灾试验的规模建模

IF 3.1 2区农林科学

Wood Science and Technology Pub Date : 2024-06-27 DOI: 10.1007/s00226-024-01568-9

Michael J. Gangi, Brian Y. Lattimer, Scott W. Case

{"title":"Scale modeling of thermo-structural fire tests of multi-orientation wood laminates","authors":"Michael J. Gangi, Brian Y. Lattimer, Scott W. Case","doi":"10.1007/s00226-024-01568-9","DOIUrl":"10.1007/s00226-024-01568-9","url":null,"abstract":"<div><p>The stacking sequence of laminated wood significantly impacts the composite mechanical behavior of the material, especially when scaling down thermo-mechanical tests on plywood. In previous research, we developed a scaling methodology for thermo-structural tests on samples with similar cross sections, however this paper focused on testing plywood samples with different stacking sequences between the scales. Plywood samples at ½-scale and ¼-scale were subjected to combined bending and thermal loading, with the loading scaled to have the same initial static bending stresses. While the ¼-scale 4-layer [0°/90°]s laminate and the ½-scale 8-layer [0°/90°/90°/0°]s laminate had an equal number of 0° and 90° layers, as the char front progresses, the sections behave differently. Thus, modeling becomes essential to extrapolating the data from the smaller ¼-scale test to predict the behavior of the larger ½-scale test. Reduced cross-sectional area models (RCAM) incorporating classical laminated plate theory were used to predict the mechanical response of the composite samples as the char front increased. Three methods were proposed for calibrating the RCAM models: Fourier number scaling, from detailed kinetics-based pyrolysis GPyro models, and fitting to data from fire exposure thermal response tests. The models calibrated with the experimental char measurements produced the most accurate predictions. The experimental char models validated to predict the behavior of the ¼-scale tests within 2.5%, were then able to predict the ½-scale test behavior within 4.5%.</p></div>","PeriodicalId":810,"journal":{"name":"Wood Science and Technology","volume":"58 4","pages":"1285 - 1322"},"PeriodicalIF":3.1,"publicationDate":"2024-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s00226-024-01568-9.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141503936","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Extraction and investigation of the lipophilic fraction from Norway spruce (Picea abies) and Scots pine (Pinus sylvestris) forestry side-stream biomass 从挪威云杉（Picea abies）和苏格兰松树（Pinus sylvestris）林业侧流生物质中提取和研究亲脂部分

IF 3.1 2区农林科学

Wood Science and Technology Pub Date : 2024-05-31 DOI: 10.1007/s00226-024-01566-x

Alise Zommere, Linards Klavins, Vizma Nikolajeva, Agnese Kukela, Kalle Kaipanen, Risto Korpinen, Maris Klavins

{"title":"Extraction and investigation of the lipophilic fraction from Norway spruce (Picea abies) and Scots pine (Pinus sylvestris) forestry side-stream biomass","authors":"Alise Zommere, Linards Klavins, Vizma Nikolajeva, Agnese Kukela, Kalle Kaipanen, Risto Korpinen, Maris Klavins","doi":"10.1007/s00226-024-01566-x","DOIUrl":"10.1007/s00226-024-01566-x","url":null,"abstract":"<div><p>Coniferous forests in the European Union serve as crucial sources of roundwood, as well as contribute to various industries with different wood products. Harvesting of these trees leaves significant amounts of needles and small branches (logging residues). This underutilised forestry side-stream has the potential for various applications in the bioeconomy due to its chemical composition. Extraction of biomass involves various methods and solvents, including petroleum-based solvents, raising environmental and health concerns. This study aims to assess different extraction methods, with a focus on minimising or eliminating the use of hydrocarbon solvents, thereby refining valuable compounds for various applications, as well as evaluating the antimicrobial, antifungal and antioxidant activities of the obtained extracts. The most effective methods in extracting pine and spruce wood logging residues were determined to be maceration at boiling temperature with methanol and butanol, respectively. Extracts consisted of various compound groups such as fatty acids, resin acids, terpenes and more. The obtained extracts demonstrated antimicrobial and antifungal activity, as well as antioxidant activity.</p></div>","PeriodicalId":810,"journal":{"name":"Wood Science and Technology","volume":"58 4","pages":"1259 - 1284"},"PeriodicalIF":3.1,"publicationDate":"2024-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141195488","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Chemical surface densification of sugar maple through Michael addition reaction 通过迈克尔加成反应实现糖枫的化学表面致密化

IF 3.1 2区农林科学

Wood Science and Technology Pub Date : 2024-05-31 DOI: 10.1007/s00226-024-01564-z

Vahideh Akbari, Stéphanie Vanslambrouck, Véronic Landry

{"title":"Chemical surface densification of sugar maple through Michael addition reaction","authors":"Vahideh Akbari, Stéphanie Vanslambrouck, Véronic Landry","doi":"10.1007/s00226-024-01564-z","DOIUrl":"10.1007/s00226-024-01564-z","url":null,"abstract":"<div><p>Wood densification is a technique to enhance wood density and hardness, presenting a promising solution to expand wood use across various applications. However, current densification methods have cost and environmental impact limitations. This project introduces a potential environmentally friendly approach involving surface chemical densification through in-situ polymerization, using carbon Michael addition reaction between biobased acrylate and malonate monomers. This reaction, conducted in mild conditions with low energy and solvent consumption, aims to enhance wood densification while minimizing environmental impact. Various malonate-acrylate systems were formulated, and were optimized based on their viscosity, conversion rate, glass transition temperature, crosslinking density, and hardness. Then, sugar maple wood samples were densified with the best formulations. Monomers with lower viscosity demonstrated higher chemical retention. Density profile and penetration depth were also higher for the samples impregnated with lower viscosity formulations, which was confirmed by scanning electron microscopy. Confocal Raman spectroscopy confirmed that formulations successfully filled lumens and vessels without reacting with the cell wall components. Brinell hardness was used to determine the hardness of natural and densified woods. One-way ANOVA data analysis showed a significant increase in hardness of densified samples compared to untreated wood; however, based on TUKEY Anova analysis, no noticeable difference was reported between impregnated samples with different formulations. Overall, results showed the potential of the Michael addition reaction in wood impregnation.</p></div>","PeriodicalId":810,"journal":{"name":"Wood Science and Technology","volume":"58 3","pages":"1199 - 1225"},"PeriodicalIF":3.1,"publicationDate":"2024-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141195300","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Laccase-catalyzed octadecylamine modification enables green and stable hydrophobization of bamboo 拉克酶催化的十八胺改性实现了竹子的绿色稳定疏水化

IF 3.1 2区农林科学

Wood Science and Technology Pub Date : 2024-05-31 DOI: 10.1007/s00226-024-01545-2

Siyao Chen, Zhiwei Fan, Xuanhao Huang, Xiaohong Wang, Yuzhu Chen, Yong Yang, Ying Zhao, Tonghua Lu, Fangli Sun, Hui Wang

{"title":"Laccase-catalyzed octadecylamine modification enables green and stable hydrophobization of bamboo","authors":"Siyao Chen, Zhiwei Fan, Xuanhao Huang, Xiaohong Wang, Yuzhu Chen, Yong Yang, Ying Zhao, Tonghua Lu, Fangli Sun, Hui Wang","doi":"10.1007/s00226-024-01545-2","DOIUrl":"10.1007/s00226-024-01545-2","url":null,"abstract":"<div><p>Bamboo has attracted widespread attention owing to its strong mechanical properties, availability in numerous regions, and green and low-carbon nature. However, the hydrophilic nature and susceptibility to mold growth limit its wide application. Therefore, this study uses green biological enzyme technology to improve the hydrophobic performance of bamboo, grafting hydrophobic monomer octadecylamine (OA) onto bamboo surfaces under the catalysis of laccase. The optimum reaction conditions such as the amounts of OA monomer and laccase, reaction time, and temperature were determined. Under these optimized conditions, the contact angle of treated bamboo reached 121°± 3°, which was six times higher than that of untreated bamboo, and its hydrophobicity is very stable compared to that of OA-bamboo, could withstand soaking and washing with hot water, ethanol and acetone, and the change rate of contact angle during 180s test was ∼1%. Moreover, as the water absorption rate of bamboo decreased, the defects of bamboo susceptible to mildew growth also considerably improved. The hydrophobic modification mechanism was studied using SEM (scanning electron microscopy), <sup>1</sup>H-NMR (nuclear magnetic resonance), and XPS (X-ray photoelectron spectroscopy), this analysis confirmed that OA grafting onto bamboo under laccase catalysis resulted in stable hydrophobicity. Moreover, OA chemically reacted with lignin in bamboo, possibly forming a C–N bond. This study provides valuable insights into the expanding applications of bamboo as sustainable materials.</p></div>","PeriodicalId":810,"journal":{"name":"Wood Science and Technology","volume":"58 3","pages":"1095 - 1110"},"PeriodicalIF":3.1,"publicationDate":"2024-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141198381","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effect of tracheid cell structure on gas permeability and porosity in conifer species 气管细胞结构对针叶树种气体渗透性和孔隙率的影响

IF 3.1 2区农林科学

Wood Science and Technology Pub Date : 2024-05-30 DOI: 10.1007/s00226-024-01562-1

Kaiyuan Li, Chongpeng Ye, Wei Peng, Yanyan Zou, Xi Deng, Linlin Yi, Xujuan Wu

{"title":"Effect of tracheid cell structure on gas permeability and porosity in conifer species","authors":"Kaiyuan Li, Chongpeng Ye, Wei Peng, Yanyan Zou, Xi Deng, Linlin Yi, Xujuan Wu","doi":"10.1007/s00226-024-01562-1","DOIUrl":"10.1007/s00226-024-01562-1","url":null,"abstract":"<div><p>This study utilized a self-developed gas permeability–porosity integrated analyzer to examine the gas permeability and porosity of pine, cypress, and Cunninghamia conifers across different wood orientations and parts. The findings reveal that the longitudinal permeabilities of conifers are higher than the radial and tangential permeabilities by factors of 14–100 and 275–600, respectively. A consistent exponential relationship exists between longitudinal permeability and porosity, irrespective of species. In the sapwood, the tracheid dimensions are 110.5–132.1% in radius and 103.6–116.2% in length compared to heartwood. A single tracheid exhibits higher longitudinal flow resistance than those in the radial and tangential directions. The primary longitudinal flow resistance stems from the lap surface of the upper and lower tracheids series connected with pits. In radial and tangential directions, the gas flow encounters a high density of pits from a series of connected tracheids. The number of series-connected tracheids in the longitudinal direction is only 1% of those in radial and tangential directions, whereas it reaches up to 600 times for parallel connections. This leads to considerably lower total flow resistance in the longitudinal direction compared to radial and tangential directions. The measured higher longitudinal gas permeability aligns well with the model calculations and the gas microseepage is predominantly related to tracheid structure, causing permeability variations.</p></div>","PeriodicalId":810,"journal":{"name":"Wood Science and Technology","volume":"58 3","pages":"1181 - 1197"},"PeriodicalIF":3.1,"publicationDate":"2024-05-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141195417","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Influence of natural aging on wood combustion heat release 自然老化对木材燃烧热量释放的影响

IF 3.1 2区农林科学

Wood Science and Technology Pub Date : 2024-05-30 DOI: 10.1007/s00226-024-01565-y

Jingyu Zhao, Xinrong Jiang, Jiajia Song, Shiping Lu, Yueyan Xiao, Chi-Min Shu

{"title":"Influence of natural aging on wood combustion heat release","authors":"Jingyu Zhao, Xinrong Jiang, Jiajia Song, Shiping Lu, Yueyan Xiao, Chi-Min Shu","doi":"10.1007/s00226-024-01565-y","DOIUrl":"10.1007/s00226-024-01565-y","url":null,"abstract":"<div><p>Wood is a primary building tool for ancient buildings and structures, but for those that survive to date, naturally aged wood may pose a noteworthy fire hazard. There are potential risks to health, safety, and substantial cultural loss if fire risks in such buildings are not mitigated. We obtained several samples of aged wood commonly used in ancient structures (elm, pine, and aspen), and compared the kinetic and thermal characteristics to fresh wood examples to determine potential methods of enhancing safety. Differential scanning calorimetry was used to establish the heat release characteristics of the fresh and aged samples, and the characteristics of the thermal reaction stages were characterized using the temperature range and heat release laws for each reaction stage. The heat release characteristics during combustion were investigated for different heating rates, and the influence of aging on temperature change and heat release rate characteristics during different exothermic stages was assessed. Finally, using heat flow data, the apparent activation energy (AAE) of the samples and their distributions during different exothermic stages were calculated and analyzed via the Friedman differential iso-conversion method. Results showed that the exothermic energy of the aged samples was higher than that of the fresh samples, indicating that aging does impact the thermal reaction process. The aged samples in this study had a greater heat diffusion capacity, transmitted more heat, were more susceptible to burning (by spreading that heat), and generally posed a greater fire hazard. During the rapid exothermic phase, the AAE of aged wood increased as the reaction progressed, and exhibited lower AAE with a greater sensitivity to fire than fresh samples. A sound linear relationship between pre-exponential factor and AAE and the kinetic compensation effect was obvious. This study provided a rudimentary theoretical basis for the prevention of fires in timber-framed ancient buildings.</p></div>","PeriodicalId":810,"journal":{"name":"Wood Science and Technology","volume":"58 3","pages":"1227 - 1257"},"PeriodicalIF":3.1,"publicationDate":"2024-05-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141198278","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0