Effect of microwave assisted alkali pretreatment and other pretreatment methods on some properties of bamboo fibre reinforced cement composites

Akinyemi, A. Banjo; Omoniyi, E. Temidayo; Onuzulike, Godwin

doi:10.1016/j.conbuildmat.2020.118405

Cited by 77 publications

(25 citation statements)

References 52 publications

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“…At the C=O bond stretching relating to the hemicellulose group, a reduction in the peak transmittance is also observed from 1648.4 cm-1 (untreated BF) to 1627.1 cm -1 (6% NaOH treated BF) (Neto et al, 1996;Shanmugasundaram & Rajendran, 2016). The peak at 1320.1 (raw fibre) and 1306.2 (6% treated fibre) indicates the deformation of cellulose and hemicellulose (C-H bond) (Akinyemi, Omoniyi, & Onuzulike, 2020;Chandrasekar et al, 2017). In comparison, the fingerprints peak at 1062.4 cm -1 (raw BF) and 1041.0 (treated BF) is associated with the deformation of cellulose and lignin due to alkali treatment (Shanmugasundaram & Rajendran, 2016).…”

Section: Chemical Compound Analysis (Ftir) For Treated and Untreated Bfmentioning

confidence: 96%

Optimization of mechanical properties of cellular lightweight concrete with alkali treated banana fiber

Nensok

Mydin

Awang

2021

rdlc

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Recent advancements in construction materials development have involved the utilization of plant-based natural fibers such as kenaf, sisal, coir and banana to replace conventional fibers such as carbon, steel, polypropylene and aramid. However, the main issue with using these fibers is the alkaline cement matrix's durability and compatibility due to high water absorption. Hence, this research focuses on the use of alkali treatment of banana fibers to enhance the mechanical properties of cellular lightweight concrete (CLC). Banana fibers were subjected to 2%, 4%, 6%, 8%, and 10% NaOH treatment before being included in 1200 kg/m3 density CLC. Plain CLC and untreated fiber composites (0% NaOH treatment) were used as the control. Results from the study indicate that compared to the untreated fibre composites and plain control CLC at 28 days, compressive, flexural and splitting tensile strengths increased simultaneously with 6% NaOH fibre treatment to peaks of 40.6% and 59.8%, 63.8% and 117.4%, and 77.4% and 157.8% respectively. The 6% NaOH treatment of BF tremendously improved the mechanical characteristics of single fibers and BFRCLC composites. It is therefore concluded that 6% NaOH treatment of banana fibre was the optimum percentage alkali treatment for use in CLC.

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Section: Chemical Compound Analysis (Ftir) For Treated and Untreated Bfmentioning

confidence: 96%

Optimization of mechanical properties of cellular lightweight concrete with alkali treated banana fiber

Nensok

Mydin

Awang

2021

rdlc

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“…8) and, hence, cannot enhance the maximum flexural strength and impact resistance of the composites [77]. Akinyemi et al [78] studied the effects of different pre-treatment methods on bamboo fiber cement composite materials and observed that microwave-assisted alkali treatment enhanced mechanical properties. Sanchez-Echeverri et al [79] compared the performance of bamboo fiber reinforced cement made from treated and untreated bamboo fibers and reported that the applied alkali treatment produced enhanced flexural strength.…”

Section: Construction Industrymentioning

confidence: 99%

Properties and Applications of Bamboo Fiber–A Current-State-of-the Art

Chen¹,

Li²,

Dauletbek³

et al. 2022

Journal of Renewable Materials

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Fibers are used in many forms in engineering applications-one of the most common being used as reinforcement. Due to its renewable short natural growth cycle and abundance of bamboo resources, bamboo fiber has attracted attention over other natural fibers. Bamboo fiber has a complex natural structure but offers excellent mechanical properties, which are utilized in the textile, papermaking, construction, and composites industry. However, bamboo fibers can easily absorb moisture and are prone to corrosion limiting their use in engineering applications. Therefore, a better understanding of bamboo fiber is particularly important. This paper reviews all existing research on the mechanical characterization of bamboo fiber with an emphasis on the extraction and treatment techniques, and their effect on relevant properties. The chemical composition of bamboo fibers has also been thoroughly investigated and presented herein. Current applications and future opportunities for bamboo fibers in various fields have been presented with a focus on research needs. This work can serve as a reference for future research on bamboo fiber.

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“…On the macroscopic scale, round bamboo is a typical natural fiber-reinforced composite material with thick-walled bamboo fibers as the reinforcing phase and thinwalled porous basic structure as the matrix phase. On the microscopic scale, round bamboo is a nanocomposite with microfibrils as the reinforcing phase and lignin and hemicellulose as the matrix phase (Gillis 1969;Bardage et al 2004;Simmons et al 2016;Akinyemi et al 2020). The drying of round bamboo is an important part of its industrial application.…”

Section: Introductionmentioning

confidence: 99%

Distribution and migration of moisture in round bamboo in response to microwave drying

Chen

Lian

et al. 2021

BioRes

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Characterized by its light weight, high strength, and good flexibility, round bamboo is a natural functional biomaterial with a multi-level structure. Cracking is a key factor hindering its wider application. Moisture changes cause cracking when the round bamboo is dried. Therefore, studying moisture variations in the drying process of round bamboo can effectively reduce or solve the cracking problem. In this study, microwave drying with computer tomography (CT) imaging technology was used to understand the distribution and migration of moisture in round bamboo in the course of drying. The results indicated that water content has a significant correlation with the CT value, which can be used to achieve rapid determination of water content. The radial water content of samples gradually decreased from bamboo green (outer) to bamboo yellow (inner). The axial water content was high in the middle and low on both ends. As the water content decreased, the axial moisture distribution was consistent. The internode moisture mainly moved from the junction of bamboo yellow and bamboo partition, entered the adjacent cavity, and then gradually moved outward. Thus, the microwave drying method can effectively achieve industrial drying of round bamboo and prevent cracking.

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Effect of microwave assisted alkali pretreatment and other pretreatment methods on some properties of bamboo fibre reinforced cement composites

Abstract: h i g h l i g h t s More cellulose extractives were removed through microwave irradiation. Microwave assisted alkaline treatment improved the fibre roughness and ductility. Cementitious composites with microwave treated fibers had optimum performance.

Cited by 77 publications

References 52 publications

Optimization of mechanical properties of cellular lightweight concrete with alkali treated banana fiber

Optimization of mechanical properties of cellular lightweight concrete with alkali treated banana fiber

Properties and Applications of Bamboo Fiber–A Current-State-of-the Art

Distribution and migration of moisture in round bamboo in response to microwave drying

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