Now Is the Time We Live Like Bamboo Shinohara, Norimitsu
Japanese Journal of Radiological Technology,
2020, 20200101, Volume:
76, Issue:
7
Journal Article
This reprint covers the latest developments in the field of eco-polymeric materials and natural polymer processing and utilization, highlighting cutting-edge research focusing on the processing of ...advanced polymers and their composites. It demonstrates that the field of eco-polymeric materials and natural polymers is still gaining increased attention. Innovative approaches as well as advanced applications of eco-polymeric materials and natural polymers in different fields, such as energy, environment, biomedical, biomaterial, and engineering, are reported in this reprint.
Category:
Hindfoot
Introduction/Purpose:
Tibiotalocalcaneal (TTC) fusion is a salvage procedure for post-traumatic as well as neuropathic cases. Many of these cases are characterised by some or other ...form of loss of talus resulting in a defect. At TTC fusion, prevention of shortening following such a defect is a challenge. Though allografts have helped solve this issue, they may not be easily available in developing countries. A retrospective analysis of prospectively collected data of 14 cases of TTC fusion with loss of talus is presented here. Cases were managed with innovative defect bridging ‘Bamboo Hut’ technique.
Methods:
Cases with either preoperative or perioperative loss of talus who required bridging of defect were included in the present study. Resultant defect following excision of the talus was bridged with two or three vertically placed fibular strut grafts. Grafts were snugly tied with each other with sutures to prepare a construct like a hut supported with wooden steaks (Bamboo). Fixation was carried out with indigenous TTC nail with a built-in compression device to generate compression of grafts between tibia and calcaneus.
Results:
Present series comprised of 6 post-traumatic cases, 7 cases of diabetic Charcot neuroarthropathy and 1 case of neuroarthropathy following operated meningomyelocele. Cases were followed up for an average period of 36 months with the average time to union being six months. All posttraumatic cases went on to the bony union but two out of eight neuropathy cases ended up in fibrous union with collapse & loss of fixation. Wound healing issues were noticed in two cases. None of the cases required amputation.
Conclusion:
With non-availability of allografts, prevention of shortening at TTC fusion is a challenge. This issue can be successfully managed with innovative ‘Bamboo Hut’ grafting technique, supported with in-built compression of the fusion site with the use of an indigenous nail.
In this study, bamboo fiber/high-density polyethylene (HDPE) composites were prepared, and the effects of nano-TiO sub(2) on their thermal properties and crystallization behavior were investigated ...via thermal gravimetric analysis (TGA), differential scanning calorimetry (DSC), X-ray diffraction (XRD), and Fourier transform infrared spectroscopy (FTIR). The results show that the addition of nano-TiO sub(2) improved the thermal stability and had a dual function in the crystallization behavior of the composites. On one hand, it functioned as a nucleating agent. The addition of 2 wt % nano-TiO sub(2) promoted the crystallization, which caused the increase of the crystallization rate and crystallinity degree, as well as the micronization of the crystalline grain. On the other hand, intermolecular hydrogen bonds and covalent bonds were formed between nano-TiO sub(2) and the polymer matrix, which hindered the crystallization of the composites. When the content of nano-TiO sub(2) was continually increased, the inhibitory effect of the crystallization was gradually enhanced, which resulted in a decrease in the crystallization rate and crystallinity degree of the composites. copy 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014, 131, 39846.
•Laminated bamboo and bamboo scrimber are value added EBPs, most popular for structural applications.•Bamboo scrimber has higher density and higher mechanical strength as compared to laminated ...bamboo.•High performance EBps can be achieved by optimizing the size of bamboo strips, resin concentration, processing temperature, and pressure.•BRC elements (like beam, column and panels) can withstand higher temperatures in comparison with round bamboo and EBPs.•Use of water resistant coatings and wrapping of thin wire is beneficial to overcome the bamboo-concrete bonding issues.•High strength- heat resisting fibers are useful to control the concrete spalling in BRC elements at elevated temperatures.
Laminated bamboo and bamboo scrimber are value-added engineered forms of bamboo produced in standard shape and size, with better physical and mechanical characteristics that make them highly attractive for structural applications. Other than engineered bamboo, bamboo as a reinforcement can be used to replace steel bars in concrete structures. The present study summarizes the progress in research work carried out for establishing bamboo as a sustainable construction material covering the different aspects, namely, the processing of bamboo, physical and mechanical properties, and fire performance of bamboo-based structural elements. The chemical and thermal treatment of bamboo, along with the optimization of various processing parameters, significantly influence the physical and mechanical behaviour of engineered bamboo elements. Bamboo scrimber is having better mechanical properties as compared with laminated bamboo elements. Bamboo undergoes a pyrolysis process above 150 °C and losses mass and strength at elevated temperatures. The charring rate for bamboo scrimber is lower than the laminated bamboo, and the use of fire-retardant coating materials is highly significant in controlling the heat release rate and suppressing the release of toxic gases. Bamboo reinforcement of around 4% is an optimum value to control the cracking and enhance the strength and toughness of the concrete matrix. The use of water replant coatings, and mechanical anchorage are recommended to enhance the bond strength of bamboo reinforcement and cement matrix. Bamboo-reinforced concrete (BRC) elements coated with the fire-protective compound can withstand higher temperatures (500 °C or more) without concrete spalling. BRC panels are highly suitable for constructing lightweight and cost-efficient walling systems. This review work illustrates the potential of engineered bamboo and BRC elements to meet the growing demand for low-cost housing.
The natural arc‐shaped bamboo laminated lumber (ABLL) maintained the natural structure of bamboo material. It had significance for its various applications in bamboo industry. This article took the ...thickness (T) and width (W) of the ABLL as the research object. The first mathematical model determined the relationship among the size of the bamboo tubes, the number of divisions and the thickness (T) of the ABLL. In order to avoid forming incomplete arc‐shaped bamboo corners during the process of sawing of ABLL into square lumber, we used Mathlab analysis to obtain the appropriate numbers of divisions were 4–6 parts. Moreover, the thickness (T) of ABLL was found to be 37–62 mm. The second mathematical model determined the relationship between the size of the equal‐arc shaped bamboo split and the width (W) of ABLL. The proposed mathematical models provided a grading basis for the material selection in the processing of ABLL, optimized the utilization of bamboo, and was of great significance for high‐quality preparation of ABLL.
The natural arc‐shaped bamboo laminated lumber (ABLL) maintains the natural structure of bamboo material. Two mathematical models for the ABLL thickness (T) and width (W) were established. The proposed mathematical models provided a grading basis for the material selection in the processing of ABLL, optimized the utilization of bamboo, and was of great significance for high‐quality preparation of ABLL.
Bamboo is a promising natural fiber source for developing sustainable and green textile materials. Different fiber treatment techniques have been explored to produce natural bamboo textile fibers ...(BTF) with enhanced physical and chemical characteristics suitable for yarn processing and fabric weaving. This study presents a facile, low-cost, and environmentally friendly technique of transforming natural bamboo raw fiber into a yarn-spinnable BTF that can be developed into an all-natural fiber-based blended yarn. The combined alkali and multi-enzyme treatment of natural BTF resulted in a notable enhancement in the linear density, tenacity, and elongation by 106%, 30%, and 13%, respectively. The improvement in the physical properties of the fibers is highly correlated to the reduction in the non-cellulosic components such as lignin, residual gum, fats, and waxes by 29%, 56%, and 72%, respectively, which also led to an increase in surface roughness and crystallinity of the fibers. The alkali-enzymatic treated bamboo textile fiber underwent a further mechanically intensive process to attain nearly similar dimensions with cotton fibers that serve as its carrier fiber to produce natural fiber-blended yarns containing both the excellent properties of cotton and bamboo. Thin and thick cotton-bamboo blended yarns ranging from 60 tex to 120 tex were prepared and shown to have comparable characteristics such as tenacity and elongation, which are applicable in the weaving of medium-weight and heavyweight fabrics. The alkali-enzymatic fiber treatment of BTF strongly shows its viable potential in manufacturing green and environmental-friendly natural bamboo textile materials.
Display omitted
•Alkali degumming and multi-enzymatic treatment of natural bamboo textile fibers.•Green approach for reducing the non-cellulosic fiber components in raw bamboo fibers.•Strong, fine, and highly cellulosic natural bamboo textile fibers were produced.•Thin and thick bamboo-blended yarns were developed and made into mediumweight Bamboo-blended fabrics.•Effective and sustainable technique to produce natural and eco-friendly bamboo textile materials.
At current rates, the building industry is the major contributor to gas emissions and energy consumption in the world, placing unprecedented pressure to find alternative and sustainable construction ...materials, particularly in regions where urbanization and population growth are expected to rise. Coincidentally, bamboo culms are a sustainable and abundant resource with the potential to be used as a structural element in those regions, however, their organic nature and inherent incompatibility with modern design and construction procedures have hampered their formal utilization. This article presents the details of an innovative workflow based on the philosophy that the quality and reliability of bamboo structures can be computationally managed through the digitization of individual structural bamboo elements. The workflow relies on reverse-engineering processes that integrate and make bamboo culms compatible with modern data-management platforms such as Building Information Modelling. A case study based on a reconstruction project of bamboo houses in Lombok, Indonesia is presented to illustrate the proposed workflow. This work showed that digitization and management are not just to represent shapes and information regarding bamboo culms through computer software, but can also control the quality, sustainability, and structural behavior of a bamboo structure during its entire service life.
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