Mechanical properties and fractography of cement-based composites reinforced by natural piassava and jute fibers

Teixeira, Felipe Pinheiro; Lima, Victor Nogueira; Moutinho, Daniel J.; Fujiyama, Roberto Tetsuo

doi:10.1590/0366-69132022683853174

Cited by 3 publications

(1 citation statement)

References 23 publications

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“…However, it should be noted that a significantly strong bond between fiber and matrix does not guarantee the ductility of the material by itself, since in addition to the quality of the interface, the quality of the fiber and matrix individually must be considered. Therefore, fiber tensile strength, matrix microstructure, and fiber length, alignment, and content are important to the process of mitigating crack propagation [42]. Furthermore, in the case of composites with aligned fibers, attention should be paid to the number of reinforcement layers, the distance between them, and the thickness and quality of the matrix covering layer, in order to enhance the fiber's action in controlling the opening of cracks [32,43].…”

Section: Introductionmentioning

confidence: 99%

On the mechanical properties and crack pattern analysis of a strain-hardening cement-based composite reinforced by natural sisal fibers

et al. 2022

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Besides the strength enhancement and strain improvement (strain-hardening behavior), the use of natural fibers as reinforcement in cement-based matrices can also be highlighted as an economical and eco-friendly alternative for the future of the construction industry. In the present work, cement-based composites reinforced by natural sisal fibers were produced and tested under direct tensile loading. The Portland cement was partially replaced by pozzolans (metakaolin -MK and fly ash -FA), aiming to produce a calcium hydroxide-free matrix to ensure the durability of the fibers. The natural sisal fibers were used in a 5% volume fraction (in mass), divided into three layers. The mechanical properties of composite plates were compared to other literature results and demonstrated to be compatible with recent research. The crack pattern was analyzed by Digital Image Correlation (DIC) for a better understanding of their failure mechanisms. The material presented a tensile strength increase after the first crack formation, marked by multiple cracking partners from this point. Finally, a comparison between direct (LVDTs) and indirect (DIC) methods of strain measurement was done and demonstrated minor results for the DIC, approximately 84% of those obtained from the LVDTs.

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Section: Introductionmentioning

confidence: 99%

On the mechanical properties and crack pattern analysis of a strain-hardening cement-based composite reinforced by natural sisal fibers

et al. 2022

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Wood Residue of Jatobá (Hymenaea courbaril) and Short Fiber of Malva in Composites

Da Costa,

Banna,

Fujiyama

2023

RGSA

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Theoretical reference: The composites are formed by combining two or more materials, enabling improvements in properties and a variety of applications. These materials are highlighted by presenting low cost and enabling environmentally friendly alternatives. Method: Quantitative study, In this work, composites of polyester matrix reinforced by mauve fibers, jatoba wood residues and hybrid mauve/residue system, were analyzed mechanically and microstructurally. The fabrication of the composites began with the cut of the mauve fibers in the lengths of 5, 10 and 15 mm. In the manufacture of the specimens, terephthalic polyester resin was used with incorporation of fibers and residue. The specimens were produced in silicone molds, for the tensile strength tests and scanning electron microscopy (SEM) analysis. Results and conclusion: From the results obtained in the tensile test, it is observed that the resistance of the composites with mauve fibers of 15 mm (25,09 MPa) and hybrids in the proportions of 75% fiber/25% residue (26,06 MPa). In the microstructural characterization, the composites analyzed presented factors that contributed to the improvement and reduction of performance in the results of tensile strength. Implications of the research: It presents important and overwhelming results on composite materials with wood waste and mallow fibers, providing an alternative for inserting waste and fibers into materials with good properties and low cost. Originality/value: The compounds stand out for their simple and viable manufacturing method, in addition to superior results in relation to proven properties. Given the need to search for new materials with good properties and with minimal impacts on the environment.

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Comparison of theoretical and experimental maximum stress of polyester composite and aligned sisal fibers

Dias,

Junior,

de Mendonca Maia

et al. 2024

SAE Technical Paper Series

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<div class="section abstract"><div class="htmlview paragraph">Natural fibers such as sisal, jute, and curauá have lengths that allow the production of aligned specimens. In the case of sisal fiber, this length varies from 700 to 1100 mm, making it possible to manufacture composites with lengths that fit the dimensions provided for in specific standards such as ASTM D3039M. This work seeks to evaluate the mechanical resistance of a composite of natural Sisal fiber aligned 0° unidirectional in the form of a plate, making a comparison in the tension obtained with experimental data through the universal testing machine EMIC with the theoretical data applying the mixing rule. The methodology used to manufacture these plates was manual, which fits the proposal of using little equipment or technology to obtain these composite materials. On the occasion, glass plates and double-sided tape were used so that the fibers maintained their alignment and it was possible to manufacture them. The results were satisfactory and within expectations for this type of orientation and fiber, obtaining a maximum tension of 147.10 MPa for the experimental test and 147.24 obtained theoretically by the mixture rule equation. Experimental data usually differ from theoretical ones and one of the proposals of this work is to evaluate the possible possibilities of factors that influence this differentiation.</div></div>

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Mechanical properties and fractography of cement-based composites reinforced by natural piassava and jute fibers

Cited by 3 publications

References 23 publications

On the mechanical properties and crack pattern analysis of a strain-hardening cement-based composite reinforced by natural sisal fibers

On the mechanical properties and crack pattern analysis of a strain-hardening cement-based composite reinforced by natural sisal fibers

Wood Residue of Jatobá (Hymenaea courbaril) and Short Fiber of Malva in Composites

Comparison of theoretical and experimental maximum stress of polyester composite and aligned sisal fibers

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