Effect of alkali treatment on physical–chemical properties of sisal fibers and adhesion towards cement-based matrices

Castoldi, Raylane de Souza; Souza, Lourdes Maria Silva de; Souto, Felipe; Liebscher, Marco; Mechtcherine, Viktor; Silva, Flávio de Andrade

doi:10.1016/j.conbuildmat.2022.128363

Cited by 36 publications

(11 citation statements)

References 75 publications

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“…In a study of Castoldi et al, 26 the alkaline hydrolysis (5 wt% NaOH) of sisal fibers has significantly enhanced pullout properties of treated fibers compared to the untreated fibers (approximately +118% of the peak debonding load and +67% of the interfacial bond strength). The improved adhesion could be related to the removal of components present initially at the fibers surface.…”

Section: Vegetable Fiber Pre-treatmentsmentioning

confidence: 97%

See 1 more Smart Citation

Assessment of vegetable fiber-matrix adhesion and durability, in cement-based and polymer-based composite: Principles from literature review

Closse,

Onesippe Potiron,

Arsene

et al. 2023

Journal of Composite Materials

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This paper presents some principles of research done on the assessment of fiber-matrix adhesion and durability in cement-based and polymer-based composites reinforced with vegetable fibers. Natural vegetable fibers are light, biodegradable and low-cost; however, their compatibility with both matrices - which are generally hydrophobic- is poor, because of their hydrophilic character. This review presents the different strategies proposed in literature to improve (1) interfacial bonding between matrix and fibers and (2) sustainability of composite materials reinforced by vegetable fibers. In order to achieve these goals, searchers investigate chemical or/and physical treatments of fibers and/or matrix modification of composites materials. The impacts of these strategies are followed in terms of mechanical properties, thermal properties, morphology and water absorption of the composite materials. Authors proposed to focus on the influence of aging on these characteristics in order to estimate durability.

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Section: Vegetable Fiber Pre-treatmentsmentioning

confidence: 97%

“…The processes described in literature are listed in Figure 1 for polymer (in green) 13,[15][16][17][18][19][20][21][22][23][24][25] and cement matrices (in blue). [26][27][28][29][30] The effects of adhesion improvement between fiber and matrix on properties and durability of polymers or cements are briefly mentioned:…”

Section: Introductionmentioning

confidence: 99%

Assessment of vegetable fiber-matrix adhesion and durability, in cement-based and polymer-based composite: Principles from literature review

Closse,

Onesippe Potiron,

Arsene

et al. 2023

Journal of Composite Materials

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“…Alkali treatment also results in an increased aspect ratio of the smaller fiber particles and makes the fiber surface rough, which helps in increasing the interfacial bonding between fiber and the matrix material [14]. Castoldi et al [15] carried out alkali treatment (1, 5 and 10 wt.% NaOH) of sisal fibers. The SEM images showed an increased roughness on the longitudinal surface of the treated fiber which is attributed to the removal of hemicellulose and lignin.…”

Section: Introductionmentioning

confidence: 99%

Influence of MXene, graphene nanoplatelet and multi-walled carbon nanotube on mechanical properties, swelling and flammability behaviour of hybrid sisal/glass fibre reinforced epoxy laminate composites

Bodduru

Singh

Kassa

et al. 2023

Mater. Res. Express

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The research work aims to utilize one of the cheapest and most abundantly available natural fibre, sisal fibre, to fabricate a hybrid nanocomposite possessing high performance efficiency. Glass fibre (GFC), sisal fibre (SFC) and hybrid glass/sisal fibre reinforced epoxy laminate composites (HFC) were prepared and subsequently, three of the most promising nano-fillers, MXene (HFCMXN), Graphene nanoplatelet (HFCGNP) and Multi-walled carbon nanotube (HFCCNT), were added into the hybrid composite. The fabricated composites were comprehensively assessed and analysed for their mechanical properties, swelling and flammability behaviour. It was observed that the glass fibre reinforced composite had lowest void content (6.3%) and glass/sisal fibre reinforced laminate had the highest void content (17.2%). The addition of nano-fillers did not further enhance the void content owing to the relatively uniform dispersion of the nanoparticle, which was particularly ensured during the whole fabrication process. The incorporation of nano-fillers led to a significant enhancement in the mechanical properties; tensile and flexural strength being highest for composites containing two dimensional nano-fillers. The GFC exhibited minimum weight gain (2.25%) and least swelling thickness (1.66%) upon soaking. Among hybrid composites, nano-filler reinforced composites had relatively less weight gain post in comparison to the hybrid composite without any nano-filler. HFCGNP had a weight gain of 6.69%, as opposed to 8.51% observed in case of HFC. The nano-fillers acted as an effective water barrier that reduced the tendency of water absorption. Furthermore, upon flammability test it was found that the burning rate decreased in order of GFC, HFC, HFCCNT, HFCMXN, HFCGNP and SFC. The addition of nano-fillers led to a decrease in the burning rate owing to the promising flame retardant properties of graphene which suppressed flame propagation and helped in extinguishing the flame.

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“…Numerous studies have investigated the long-term durability of natural fibers in cementitious binders, addressing the challenges of fiber treatments. Castoldi et al 18 developed an effective method using NaOH immersion to reduce sisal fiber moisture absorption. However, this necessitated specialized equipment and a lengthy treatment involving washing, drying, temperature variations, and expensive alkali solution.…”

Section: Introductionmentioning

confidence: 99%

“…Numerous studies have investigated the long‐term durability of natural fibers in cementitious binders, addressing the challenges of fiber treatments. Castoldi et al 18 . developed an effective method using NaOH immersion to reduce sisal fiber moisture absorption.…”

Section: Introductionmentioning

confidence: 99%

Abaca fiber as an efficient reinforcement for high mechanical performance in metakaolin‐based geopolymers

Constâncio Trindade,

Sood,

Silva

et al. 2023

Int J Applied Ceramic Tech

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This study introduces an innovative method for efficiently integrating abaca fibers into a potassium‐based geopolymer (KGP) material. Geopolymers often suffer from brittleness, and composite designs have been explored as a solution to enhance their strength and ductility. While synthetic reinforcements are commonly employed due to their consistent properties, natural fibers offer a renewable and eco‐friendly alternative. However, their widespread use has been hindered by complex and time‐consuming treatments, resulting in variable morphologies that affect fiber‐matrix adhesion. It is worth noting that previous research has primarily focused on alkali‐activated and cementitious applications, leaving a knowledge gap in understanding its interactions with calcium‐free, metakaolin‐based geopolymers. Consequently, this study aimed to simplify the conversion of raw abaca into uniformly chopped filaments, facilitating their integration into KGPs at levels of up to 7 wt%. The mechanical evaluation revealed exceptional performance, with compressive strengths reaching up to 45 MPa. A thorough analysis confirmed robust, fiber‐matrix adhesion and identified the presence of lignin and cellulose, significantly contributing to the fiber's strength. Flow table tests showcased their versatility, transitioning from high flowability (1 wt%) to complete shape retention (7 wt%). Furthermore, all variations exhibited great ductility, multiple cracking formation, and minimal variability in mechanical properties.

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Effect of alkali treatment on physical–chemical properties of sisal fibers and adhesion towards cement-based matrices

Cited by 36 publications

References 75 publications

Assessment of vegetable fiber-matrix adhesion and durability, in cement-based and polymer-based composite: Principles from literature review

Assessment of vegetable fiber-matrix adhesion and durability, in cement-based and polymer-based composite: Principles from literature review

Influence of MXene, graphene nanoplatelet and multi-walled carbon nanotube on mechanical properties, swelling and flammability behaviour of hybrid sisal/glass fibre reinforced epoxy laminate composites

Abaca fiber as an efficient reinforcement for high mechanical performance in metakaolin‐based geopolymers

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