Moisture diffusion properties of graded hierarchical structure of bamboo: Longitudinal and radial variations

Zhan, Tianyi; Sun, Fengze; Lyu, Chao; He, Qian; Xu, Kang; Zhang, Yaoli; Cai, Liping; Huang, Zhenhua; Lyu, Jianxiong

doi:10.1016/j.conbuildmat.2020.119641

Cited by 31 publications

(4 citation statements)

References 40 publications

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“…Tis implies that the outer portions of young and old bamboo culms will always be stronger than their inner and middle portions, respectively. Te authors [1,[24][25][26][27] reported a similar trend of results. Te literature has shown that the smaller and denser vascular bundle always tends to increase the physical and mechanical properties of the Bambusa vulgaris culm as the conductive activities are virtually absent within the outer portion [26,28].…”

Section: Vascular Bundle Figuressupporting

confidence: 53%

Assessment of Density and Anatomical Features of Young and Old Bambusa vulgaris (Schrad. ex J.C. Wendl.) Culm Heights as Sustainable Structural Material in Ghana

Awotwe-Mensah,

Appiah-Kubi,

Mitchual

2024

International Journal of Forestry Research

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This study sought to assess the density and anatomical features of young and old Bambusa vulgaris Schrad. ex JC Wendl. culm heights and, therefore, evaluate their influence on the utilization potential of the culm as a sustainable structural material. Bambusa vulgaris culm of 2-year and 4-year-old were harvested and prepared to the required length of 6 meters for the study. Basic density and anatomical features were carried out. The results showed that the basic density of old bamboo ranges from 652.91 kg/m³ to 729.06 kg/m³, while the young bamboo ranges from 342.33 kg/m³ to 509.52 kg/m³. The vascular bundle arrangement was found to be in Type III and Type IV for the culm heights of both young and old bamboo. The average vascular bundle radial diameter ranged from 761.13 μm to 890.78 μm for the old culm and 727.16 μm to 844.83 μm for the young culm. The average vascular bundle tangential diameter ranged from 499.44 μm to 533.49 μm for the old culm and 425.56 μm to 483.56 μm for the young culm. The radial diameter of the metaxylem vessel of the old culm ranged from 216.81 μm to 54.74 μm, while 214.23 μm to 73.86 μm were for the young culm. Parenchyma tissues ranged from 35%– to 70% for the old bamboo culm and 45% to 75% for the young bamboo culm. Vessel proportion ranged from 6%–12% for the old culm while the young culm ranged from 5%–11%. Fiber proportion ranged from 22% to 54% for the old culm and 19% to 44% for the young culm. Old bamboo had better vascular bundle properties than that of young bamboo. The density is significantly correlated positively to the anatomical properties. Old bamboo is more suitable to be used as the engineered composite material due to its better anatomical features across the culm wall thickness.

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Section: Vascular Bundle Figuressupporting

confidence: 53%

Assessment of Density and Anatomical Features of Young and Old Bambusa vulgaris (Schrad. ex J.C. Wendl.) Culm Heights as Sustainable Structural Material in Ghana

Awotwe-Mensah,

Appiah-Kubi,

Mitchual

2024

International Journal of Forestry Research

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“…Furthermore, during the high-temperature saturated steam treatment, 'bridge' reaction occurred between the hydroxyl groups in the cellulose molecular chains of the cellulosic cell wall of bamboo, which releases water and produces ether bonds. The crystallization in quasicrystalline ("paracrystalline") regions of cellulose may also contribute to the low EMC [30][31][32].…”

Section: Ftir Analysismentioning

confidence: 99%

Effect of high-temperature saturated steam treatment on the physical, chemical, and mechanical properties of moso bamboo

et al. 2020

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Moso bamboo (Phyllostachys heterocycla (Carr.) Mitford cv. Pubescens) was subjected to heat treatment with saturated steam at 140, 160, and 180 °C for 10-30 min to evaluate the effects of the treatment on the properties of bamboo. The changes in the physical, mechanical, and chemical properties as well as microscopic structures of moso bamboo were analyzed in this study. Results indicated that its equilibrium moisture content (EMC) decreased gradually after being treated by high-temperature saturated steam mostly due to the hemicelluloses' degradation. Both the temperature and duration of treatment affect the mechanical properties of bamboo. The modulus of elasticity (MOE) of bamboo was prone to be affected by heat treatment with saturated steam as compared to the modulus of rupture (MOR). The MOR and MOE increased as compared to the control when the sample was treated at 140 °C. However, a severe treatment negatively affects the mechanical properties of bamboo. The MOR and MOE decreased by 47% and 20% as compared to the control when the sample was heated at 180 °C for 30 min.

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“…Из всех указанных факторов наибольшее влияние на интенсивность тока влаги в древесине оказывает темпера- --------------------------------------------------------------- В последнее время в научной литературе большое внимание уделяют вопросам моделирования процессов диффузии влаги в древесине. К настоящему времени разработано множество теоретических моделей сушки древесины и других спецификаций, связанных с этим процессом [9,10,11]. В основе моделирования процессов переноса влаги в древесине ниже точки насыщения волокон используют первый закон Фика для стационарных процессов диффузии и второй закон Фика для описания переходных процессов в древесине, при получении универсальной модели процессов переноса влаги в древесине ниже точки насыщения волокон [12].…”

Section: деревопереработка химические технологииunclassified

Heartwood moisture conductivity of standing pine damaged by running crown and strong surface wildfire

Platonov,

Snegireva,

Kantieva

et al. 2024

Forestry Engineering Journal

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The forest fire has an effect on the tree trunk. Of the total number of fires in the forest-steppe zone of Russia, strong grass-roots fires prevail. As a result of this type of fire, the undergrowth burns out, which contributes to the most prolonged exposure to high temperature on the lumpy, economically valuable part of the trunk. The effect of high temperature affects the structure of the anatomical elements of wood, its integrity is violated. In the standing timber of the Scots pine (Pinus sylvestris L.) destructive processes occur after fire damage, which have a significant effect on its physico-mechanical properties and are accompanied by intensive tar formation. One of the primary processes in wood processing technology is its dehydration, as a result of which wood is transformed from a natural material into a technological raw material. Therefore, the application of existing technological drying modes to wood damaged by fire is impractical. It is impossible to carry out the processes of dehydration or humidification of wood without information about the value of its moisture conductivity. The moisture conductivity of wood is determined by the moisture conductivity coefficient. The value of the moisture conductivity coefficient of samples of fire-damaged and undamaged P. sylvestris heartwood extracted from the stemwood was determined by the method of stationary moisture flow in the radial and tangential directions. In comparison with the intact Scots pine wood, wood damaged by fire has an inverse dependence of the intensity of the moisture current – in the tangential direction it is higher than in the radial direction. There is a general decrease in the moisture conductivity coefficient of pine wood: in the radial direction – by 40.2 ± 1.58% (p < 0.05), in the tangential direction – by 14.5 ± 0.92% (p < 0.05) compared with intact wood. Patterns of changes in the value of the heartwood coefficient of moisture conductivity in standing pine, damaged by fire, will allow to adjust the existing drying modes and improve the quality of the dried wood and the efficiency of the softwood kiln drying technology.

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Moisture diffusion properties of graded hierarchical structure of bamboo: Longitudinal and radial variations

Cited by 31 publications

References 40 publications

Assessment of Density and Anatomical Features of Young and Old Bambusa vulgaris (Schrad. ex J.C. Wendl.) Culm Heights as Sustainable Structural Material in Ghana

Assessment of Density and Anatomical Features of Young and Old Bambusa vulgaris (Schrad. ex J.C. Wendl.) Culm Heights as Sustainable Structural Material in Ghana

Effect of high-temperature saturated steam treatment on the physical, chemical, and mechanical properties of moso bamboo

Heartwood moisture conductivity of standing pine damaged by running crown and strong surface wildfire

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