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  • Open Access

    ARTICLE

    Study on Preparation of Lignin-Containing Nanocellulose from Bamboo Parenchyma

    Wenli Gu1, Shiyi Zeng1, Assima Dauletbek2, Bin Xu1,3,*, Xinzhou Wang1, Man Yuan1, Yanni Gu1

    Journal of Renewable Materials, Vol.10, No.2, pp. 385-399, 2022, DOI:10.32604/jrm.2022.016457

    Abstract Bamboo vascular bundle fiber and parenchyma (BP) are separated by high-temperature treatment with saturated steam. Bamboo vascular bundle fiber is widely used in the market, but how to develop and utilize parenchyma tissue is a difficult problem. The sulfated cellulose nanofibers (ANFs) were obtained by sulfating BP with a deep eutectic solvent (DES), which provided a theoretical basis for the value-added utilization of BP. Using DES as the reaction medium and reagent, the BP was grafted with a sulfonic acid group to form a gel substance in water, ANFs and nanocellulose gel were obtained by More > Graphic Abstract

    Study on Preparation of Lignin-Containing Nanocellulose from Bamboo Parenchyma

  • Open Access

    ARTICLE

    Slenderness Ratio Effect on the Eccentric Compression Performance of Chamfered Laminated Bamboo Lumber Columns

    Ke Zhou1,2, Haitao Li1,2,*, Assima Dauletbek1,2, Dong Yang1,2, Zhenhua Xiong3, Rodolfo Lorenzo4, Kun Zhou5, Ileana Corbi6, Ottavia Corbi6

    Journal of Renewable Materials, Vol.10, No.1, pp. 165-182, 2022, DOI:10.32604/jrm.2021.017223

    Abstract Eccentric compression tests on 15 chamfered laminated bamboo lumber (LBL) columns with a height ranging from 600 to 3000 mm were conducted in order to study the eccentric mechanical performance. The failure of all specimens was caused by the crack of bamboo fiber in the tensile region. When the ultimate strength was reached, except specimens with a height of 600 mm, all other specimens could bear large deformation, showing good ductility. The lateral displacements of the specimens under eccentric compression were approximately parabolic in the direction of column height. The ultimate bending moment of LBL… More >

  • Open Access

    ARTICLE

    Mechanical Properties and Constitutive Relationship of the High-Durable Parallel Strand Bamboo

    Yousef Y. Sewar1, Zhancheng Zhang1, Xinmiao Meng1,*, Mohammed Y. Wahan1, Hanxiao Qi1,2, Qahtan M. Al-Shami1,3, Shijiao Luo1

    Journal of Renewable Materials, Vol.10, No.1, pp. 219-235, 2022, DOI:10.32604/jrm.2021.016013

    Abstract Engineered bamboo has recently received lots of attention of civil engineers and professional researchers due to its better mechanical performance than that of softwood timber. Parallel strand bamboo is one important part of engineered bamboo for its excellent durable performance compared to the laminated veneer bamboo. The required curing temperature in hot-pressing process is usually higher than 120°C to reduce the content of nutritional ingredients and hemy cellulose, and to avoid the decay from the environment and insects. Nonetheless, the appearance of engineered bamboo gets darker with the increase of temperature during the hot-pressing process.… More > Graphic Abstract

    Mechanical Properties and Constitutive Relationship of the High-Durable Parallel Strand Bamboo

  • Open Access

    ARTICLE

    Identification of Single Nucleotide Polymorphisms and Analysis of Linkage Disequilibrium in Different Bamboo Species Using the Candidate Gene Approach

    Xihua Liu1, Min Luo1, Xiaofei Chen1, Changjun Ding2,*

    Phyton-International Journal of Experimental Botany, Vol.90, No.6, pp. 1697-1709, 2021, DOI:10.32604/phyton.2021.015295

    Abstract Bamboos are one of the most beautiful and useful plants on Earth. The genetic background and population structure of bamboos are well known, which helps accelerate the process of artificial domestication of bamboo. Partial sequences of six genes involved in nitrogen use efficiency in 32 different bamboo species were analyzed for occurrence of single nucleotide polymorphisms (SNPs). The nucleotide diversity θw and total nucleotide polymorphisms πT of the sequenced DNA regions was 0.05137 and 0.03332, respectively. Both πnonsyn /πsyn and Ka/Ks values were <1. The nucleotide sequences of these six genes were inferred to be relatively… More >

  • Open Access

    ARTICLE

    The Arrangement and Size of Cellulose Microfibril Aggregates in the Cell Walls of Sclerenchyma Fibers and Parenchyma Tissue in Bamboo

    Wenting Ren1,3, Fei Guo2, Minghui Liu1,3, Haocheng Xu1,3, Hankun Wang1,3, Yan Yu1,2,*

    Journal of Renewable Materials, Vol.9, No.12, pp. 2291-2301, 2021, DOI:10.32604/jrm.2021.015973

    Abstract Understanding the assembly and spatial arrangement of bamboo cell wall components is crucial for its optimal utilization. Bamboo cell walls consist of aggregates of cellulose microfibrils and matrix. In the present study, the size and arrangement of cellulose microfibril aggregates in the cell walls of sclerenchyma fibers and parenchyma cells in moso bamboo were investigated with NMR and FE-SEM. The NMR measurement showed that the characteristic sizes of the microfibril aggregates of fibers and parenchyma cells were approximately 25.8 nm and 18.8 nm, respectively. Furthermore, high-resolution SEM showed the size of microfibril aggregates varied little More >

  • Open Access

    ARTICLE

    Prediction of Mechanical Properties of Structural Bamboo and Its Relationship with Growth Parameters

    Pengcheng Liu, Ping Xiang, Qishi Zhou*, Hai Zhang, Jiefu Tian, Misganu Demis Argaw

    Journal of Renewable Materials, Vol.9, No.12, pp. 2223-2239, 2021, DOI:10.32604/jrm.2021.015544

    Abstract Bamboo is a renewable natural building material with good mechanical properties. However, due to the heterogeneity and anisotropy of bamboo stalk, a large amount of material performance testing costs are required in engineering applications. In this work, longitudinal compression, bending, longitudinal shear, longitudinal tensile, transverse compression and transverse tensile tests of bamboo materials are conducted, considering the influence of the bamboo nodes. The mechanical properties of the whole bamboo stalk with the wall thickness and outer circumference are explored. Through univariate and multiple regression analysis, the relationship between mechanical properties and wall thickness and perimeter More > Graphic Abstract

    Prediction of Mechanical Properties of Structural Bamboo and Its Relationship with Growth Parameters

  • Open Access

    ARTICLE

    Effect of the Proportion of Bamboo Scraps on the Properties of Bamboo Scraps/Magnesium Oxychloride Composites

    Long Zheng, Yiqiang Wu, Shu Wang, Guoan Sheng, Baorong Sun, Yingfeng Zuo*

    Journal of Renewable Materials, Vol.9, No.10, pp. 1729-1739, 2021, DOI:10.32604/jrm.2021.015143

    Abstract This study was designed to solve the problem of large waste volume from bamboo processing residues in recent years. Using magnesium oxychloride (MO) cementitious material as the main material and bamboo residue (BR) as the reinforcing material, a BR/MO composite material was prepared. The effects of BR amount on the molding properties, mechanical strength, and water resistance of BR/MO composites were examined and discussed. Scanning electron microscopy (SEM), X-ray diffractometry (XRD), and thermogravimetric analysis were used to characterize composite microscopic morphology, crystalline structure, and heat resistance. The results showed that, when the BR content was… More >

  • Open Access

    ARTICLE

    An Experimental and Analytical Study on Cross-Laminated Bamboo Rocking Walls with Friction Dampers

    Qingfang Lv1, Tongchen Han1, Ye Liu2,*, Yi Ding1, Yujie Lu1

    Journal of Renewable Materials, Vol.9, No.10, pp. 1757-1779, 2021, DOI:10.32604/jrm.2021.015536

    Abstract

    Cross-laminated bamboo (CLB) have a high strength to weight ratio and stable bidirectional mechanical properties. Inspired by the investigation on cross-laminated timber (CLT) rocking walls, CLB rocking walls with conventional friction dampers (CFDs) are studied in this paper. To investigate the mechanical properties of the CLB rocking wall, seven tests are conducted under a cyclic loading scheme, and different test parameters, including the existence of the CFDs, the moment ratio, and the loading times, are discussed. The test results show a bilinear behavior of the CLB rocking wall. The small residual displacements of the CLB rocking

    More > Graphic Abstract

    An Experimental and Analytical Study on Cross-Laminated Bamboo Rocking Walls with Friction Dampers

  • Open Access

    ARTICLE

    The Measurement of the Local Slip in Bamboo-Reinforced Concrete Beams Using Moment-Curvature and Bond-Stress

    Muhtar*

    Journal of Renewable Materials, Vol.9, No.9, pp. 1631-1646, 2021, DOI:10.32604/jrm.2021.015452

    Abstract This paper presents a method of measuring local slip in bamboo-reinforced concrete beams. Local slips (so) are calculated by reducing the elongation of the bamboo reinforcement (ebo) with the elongation of the concrete (eco). The elongation of bamboo reinforcement (ebo) is determined in two ways, namely, read directly through a straingauge mounted on the bamboo reinforcement and calculated based on the force analysis or curvature moment as a control. The elongation of the concrete (eco) is calculated using force analysis or curvature moment. The process of calculating curvature moments and bond stress employs the Excel program. The steps… More > Graphic Abstract

    The Measurement of the Local Slip in Bamboo-Reinforced Concrete Beams Using Moment-Curvature and Bond-Stress

  • Open Access

    ARTICLE

    Visualizing Complex Anatomical Structure in Bamboo Nodes Based on X-ray Microtomography

    Elin Xiang1,2, Shumin Yang1,*, Chunjie Cao3, Xinge Liu1, Guanyun Peng4, Lili Shang1, Genlin Tian1, Qianli Ma1, Jianfeng Ma1

    Journal of Renewable Materials, Vol.9, No.9, pp. 1531-1540, 2021, DOI:10.32604/jrm.2021.015346

    Abstract In recent years, bamboo has been widely used in a broad range of applications, a thorough understanding of the structural characteristics of bamboo nodes is essential for better processing and manufacturing of biomimetic materials. This study investigated the complex anatomical structure for the nodes of two bamboo species, Indocalamus latifolius (Keng) McClure and Shibataea chinensis Nakai, using a high-resolution X-ray microtomography (μCT). The results show that the vascular bundle system in the nodal region of I. latifolius and S. chinensis is a net-like structure composed of horizontal and axial vascular bundles. Furthermore, the fiber sheath surrounding metaxylem vessels tended More >

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