Ting Wang¹, Zhiqiang Wang^1,*, Yin Yang¹, Jianhui Zhou^2,*

Journal of Renewable Materials, Vol.10, No.2, pp. 527-540, 2022, DOI:10.32604/jrm.2022.017955 - 30 August 2021

Abstract The acoustic emission (AE) technique can perform non-destructive monitoring of the internal damage development of bamboo and wood materials. In this experiment, the mechanical properties of different bamboo and wood (bamboo scrimber, bamboo plywood and SPF (Spruce-pine-fir) dimension lumber) during four-point loading tests were compared. The AE activities caused by loadings were investigated through the single parameter analysis and K-means cluster analysis. Results showed that the bending strength of bamboo scrimber was 3.6 times that of bamboo plywood and 2.7 times that of SPF dimension lumber, respectively. Due to the high strength and toughness of… More > Graphic Abstract

Assima Dauletbek¹, Haitao Li^1,2,*, Rodolfo Lorenzo³, Ileana Corbi⁴, Ottavia Corbi⁴, Mahmud Ashraf⁵

Journal of Renewable Materials, Vol.10, No.2, pp. 273-300, 2022, DOI:10.32604/jrm.2022.017805 - 30 August 2021

Abstract Over the past decade, the physical and mechanical performances of laminated bamboo lumber (LBL)–a bamboo-based structural material, have been extensively studied using experimental, analytical, and numerical approaches. This paper presents a review of existing knowledge in the literature about the mechanical properties of LBL. The paper involved the review of the response of LBL to different types of loading such as tension, bending, compression, and shear. Based on results of the literature reviewed, the strength of LBL parallel to grain was 90–124 MPa with MOE of 10700 MPa in tension, 29.55–72.60 MPa, and MOE of 8396–11022 MPa in compression,… More >

Wenli Gu¹, Shiyi Zeng¹, Assima Dauletbek², Bin Xu^1,3,*, Xinzhou Wang¹, Man Yuan¹, Yanni Gu¹

Journal of Renewable Materials, Vol.10, No.2, pp. 385-399, 2022, DOI:10.32604/jrm.2022.016457 - 30 August 2021

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

Ke Zhou^1,2, Haitao Li^1,2,*, Assima Dauletbek^1,2, Dong Yang^1,2, 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 - 27 July 2021

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 >

Yousef Y. Sewar¹, Zhancheng Zhang¹, Xinmiao Meng^1,*, Mohammed Y. Wahan¹, Hanxiao Qi^1,2, Qahtan M. Al-Shami^1,3, Shijiao Luo¹

Journal of Renewable Materials, Vol.10, No.1, pp. 219-235, 2022, DOI:10.32604/jrm.2021.016013 - 27 July 2021

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

Xihua Liu¹, Min Luo¹, Xiaofei Chen¹, Changjun Ding^2,*

Phyton-International Journal of Experimental Botany, Vol.90, No.6, pp. 1697-1709, 2021, DOI:10.32604/phyton.2021.015295 - 28 June 2021

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 π_T 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 >

Wenting Ren^1,3, Fei Guo², Minghui Liu^1,3, Haocheng Xu^1,3, Hankun Wang^1,3, Yan Yu^1,2,*

Journal of Renewable Materials, Vol.9, No.12, pp. 2291-2301, 2021, DOI:10.32604/jrm.2021.015973 - 22 June 2021

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 >

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 - 22 June 2021

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

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 - 12 May 2021

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 >

Qingfang Lv¹, Tongchen Han¹, Ye Liu^2,*, Yi Ding¹, Yujie Lu¹

Journal of Renewable Materials, Vol.9, No.10, pp. 1757-1779, 2021, DOI:10.32604/jrm.2021.015536 - 12 May 2021

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