Effect of hornification on the structure, tensile behavior and fiber matrix bond of sisal, jute and curauá fiber cement based composite systems

Ferreira, Saulo Rocha; Silva, Flávio de Andrade; Lima, Paulo Roberto Lopes; Filho, Romildo Dias Toledo

doi:10.1016/j.conbuildmat.2016.10.004

Cited by 144 publications

(95 citation statements)

References 36 publications

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“…Weibull statistics was used for the ultimate stress values, mostly to determine the reliability of the results. Following the indications presented in previous studies [5,16], the parameters were obtained by plotting the following relation:…”

Section: Resultsmentioning

confidence: 99%

Mechanical response of geopolymer composites reinforced with distinct types of fibers

Trindade¹,

Borges²,

Silva³

2018

Proceedings of the 4th Brazilian Conference on Composite Materials

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Ceramic materials, such as geopolymers, have been increasingly used in civil construction as a compatible, green-friendly, and even more efficient alternative. They are obtained through the mixture of an aluminosilicate source, with an alkali solution, and its mechanical properties may vary according to its molar ratios, curing regimes and processing conditions. Geopolymers present compatible mechanical and durable responses, despite their characteristic brittle behaviour. Fiber reinforcement appear as an interesting solution to overcome this vulnerability. Particulate, discrete and textile forms of distinct fibers can be used as reinforcements, resulting in sustainable solutions (natural fibers) and even ultraductility performance (synthetic fibers). This study presents an experimental evaluation of distinct geopolymer composites reinforced with natural (sisal, jute and curauá) and synthetic fibers (PVA). The geopolymer mixture was produced with metakaolin in a sodium based solution. Compression, tensile and pull-out tests were performed. Scanning electron microscopy (SEM) was used to investigate the hardened geopolymer microstructure. Despite presenting distinct quantitative responses, all composites exhibited strain-hardening behaviour with multiple cracking formation.

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Section: Resultsmentioning

confidence: 99%

Mechanical response of geopolymer composites reinforced with distinct types of fibers

Trindade¹,

Borges²,

Silva³

2018

Proceedings of the 4th Brazilian Conference on Composite Materials

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show abstract

“…Luna and Lizarazo-Marriaga [3] pointed out that the cross-section area measurement must be carried out on a plane perpendicular to the longitudinal axis of the fiber and proposed a method to determine the cross-section area of Guadua angustifolia bamboo fibers. There are some papers in the literature [1,[4][5][6][7][8][9] in which mechanical properties of natural fibers, like tensile strength and elastic modulus, were computed using cross-section measurements obtained through image analysis of SEM (scanning electron microscope) images. Besides not considering the slope of fibers with respect to the image plane, those papers do not take into account possible fibers crush and dismantling during cutting procedure and the fiber shrinking due to the high vacuum in the SEM.…”

Section: Introductionmentioning

confidence: 99%

On the Measurement of Cross-Sectional Area of Natural Fibers

Gomes¹,

Teixeira²,

Lima³

et al. 2018

Proceedings of the 4th Brazilian Conference on Composite Materials

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The measurement of cross-sectional area of natural fibers is fundamental in the determination of their mechanical properties. Several authors investigated the mechanical behavior of natural fibers and reported, for samples of same species, different values for tensile strength and elastic modulus. This variability can be due to many factors, such as plant variability, damage during processing or cutting, testing conditions and accuracy. This work presents a method for the measurement of cross-sectional area natural fibers that guarantees the dimensional integrity of the fiber and in which the measurement is performed on a plane perpendicular to its longitudinal axis. It comprises sample preparation, image acquisition on a reflected light microscope, and image analysis using the open source software Fiji/ImageJ. The method was applied to curaua, hemp, and sisal samples.

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“…Composites reinforced with vegetable fibers have the potential to become the final choice of green material, since it is a material of renewable origin, has wide availability and low relative cost [1]. However, it has disadvantages, such as low chemical adhesion, high water absorption capacity.…”

Section: Introductionmentioning

confidence: 99%

“…The hornification reduces the water absorption capacity of the fibers and improves fibermatrix bonding, that is because it causes structural changes in the cellulosic fibers from the wetting and drying cycles in the fibers [4,5,6]. In addition to simple and low energy consumption, this procedure increases the degree of crosslinking in the fiber microstructure, reduces the volumetric changes of natural fibers as well as promotes changes in their mechanical properties [1].…”

Section: Introductionmentioning

confidence: 99%

“…According to Ferreira et al [5], the hornification in sisal fibers provides improvement in interfacial adhesion to the matrix. The treatment applied consisted of immersion in water for three hours followed by a slow drying, of 16 hours, at 80 ° C. In another research, Ferreira et al [1] applied the same treatment to different fibers, subjected to 5 and 10 washing cycles. The results indicated a variation in treatment efficiency.…”

Section: Introductionmentioning

confidence: 99%

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Futher Analyses on Hornification Promotion by Washing Cycles on Natural Vegetable Fibers

Mendes¹,

Hugen²,

Santos³

et al. 2018

Proceedings of the 4th Brazilian Conference on Composite Materials

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Several treatments on natural fibers are presented by literature as effective process to mitigate the high water absorption and reduce dimensional variation. The wetting and drying cycles treatment is pointed as an efficient treatment since they promote the stiffening of the polymer structure of the fiber cells, known as hornification. One of the main characteristics of this process is the greater dimensional stability of the fibers. In this context, the objective of the present research is to investigate the influence of wetting time, fiber/water ratio and number of wetting and drying cycles on the treatment and its effect on sisal fibers chemical and mechanical properties. The treatment of the fibers was performed in water at room temperature (T = 22 °C), varying wetting time (1h and 3h) and fiber/water ratio (1:10 and 1:40), drying process 80°C during 15 hours. Direct tensile tests, thermogravimetry analysis (TG) and infrared spectroscopy (FTIR) were performed on raw, pre-washed and treated fibers. The results revealed that lower fiber/water ratios are better to hornification promotion. Immersion times of 3 hours were efficient to increase stiffness in all studied cases.

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Effect of hornification on the structure, tensile behavior and fiber matrix bond of sisal, jute and curauá fiber cement based composite systems

Cited by 144 publications

References 36 publications

Mechanical response of geopolymer composites reinforced with distinct types of fibers

Mechanical response of geopolymer composites reinforced with distinct types of fibers

On the Measurement of Cross-Sectional Area of Natural Fibers

Futher Analyses on Hornification Promotion by Washing Cycles on Natural Vegetable Fibers

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