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Mechanical Behavior of Geopolymeric Composites Reinforced with Natural Fibers
Abstract Geopolymers may be described as solid and stable synthesized aluminosilicate materials, whose properties are generally believed to provide a high compressive strength at early ages and demonstrate a very brittle deformation capacity in its pure form. The work in hand presents the results of an experimental investigation on the mechanical behavior of geopolymeric composites reinforced with natural fibers. The used source of silica and alumina was metakaolin, and the alkaline activator solution was composed of sodium silicate (Na2SiO3) and sodium hydroxide (NaOH). The matrix chemical reactions were investigated by diffraction (XRD) and SEM observation. Uni and bi-directional arrangements of natural fibers (sisal and jute) were used as reinforcement. The matrix was subjected to compressive loading to verify its mechanical capacity. The composites were subjected to flexural and tensile loading in order to evaluate their mechanical response and crack formation. The composites reinforced with natural fibers showed a strain and deflection hardening behavior with multiple crack formation under tensile and flexural loading. Although there were distinctions in the responses of both reinforcements, they were able to modify the matrix initial brittle behavior, making them a ductile material.
Mechanical Behavior of Geopolymeric Composites Reinforced with Natural Fibers
Abstract Geopolymers may be described as solid and stable synthesized aluminosilicate materials, whose properties are generally believed to provide a high compressive strength at early ages and demonstrate a very brittle deformation capacity in its pure form. The work in hand presents the results of an experimental investigation on the mechanical behavior of geopolymeric composites reinforced with natural fibers. The used source of silica and alumina was metakaolin, and the alkaline activator solution was composed of sodium silicate (Na2SiO3) and sodium hydroxide (NaOH). The matrix chemical reactions were investigated by diffraction (XRD) and SEM observation. Uni and bi-directional arrangements of natural fibers (sisal and jute) were used as reinforcement. The matrix was subjected to compressive loading to verify its mechanical capacity. The composites were subjected to flexural and tensile loading in order to evaluate their mechanical response and crack formation. The composites reinforced with natural fibers showed a strain and deflection hardening behavior with multiple crack formation under tensile and flexural loading. Although there were distinctions in the responses of both reinforcements, they were able to modify the matrix initial brittle behavior, making them a ductile material.
Mechanical Behavior of Geopolymeric Composites Reinforced with Natural Fibers
Trindade, Ana C. C. (author) / Arêas, Isadora O. M. (author) / Almeida, Daniela C. T. (author) / Alcamand, Himad A. (author) / Borges, Paulo H. R. (author) / Silva, Flávio A. (author)
2017-09-05
9 pages
Article/Chapter (Book)
Electronic Resource
English
Geopolymeric Composites Containing Industrial Waste Reinforced with Arundo donax Fibers
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