Effect of alkali-silica treatments of miscanthus fibres on chemical and micro-morphological modifications

Ntimugura, Fabrice; Wilson, Kyra; Vinai, Raffaele; Walker, Pete

doi:10.1016/j.clema.2023.100182

Cited by 4 publications

(1 citation statement)

References 31 publications

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“…A marked thickening of the cell wall and collapse of the lumen were also seen in the cross-section of BF/Ts (Figure 7e). The latter can be attributed to a change in the cell wall caused by the degradation of lignin and hemicellulose by the alkaline treatment [56,57]. As observed in BF/T, CF/T exhibited a rough surface with visible bulges and grooves, which can be attributed to the removal of waxes on the fiber surface (Figure 7d) [52].…”

Section: Scanning Microscopymentioning

confidence: 83%

Investigation of the Effect of Chemical Treatment on the Properties of Colombian Banana and Coir Fibers and Their Adhesion Behavior on Polylactic Acid and Unsaturated Polyester Matrices

Barrera-Fajardo,

Rivero-Romero,

Unfried-Silgado

2024

Fibers

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In this work, the adhesion behavior of chemically treated banana and coir Colombian fibers embedded in polylactic acid (PLA) and unsaturated polyester resin (UPR) matrices was investigated. Both types of fibers were treated with a 5 wt.% sodium hydroxide solution for one hour. The properties of treated and untreated fibers were determined by scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), and tensile tests. To evaluate the adhesion behavior of the fibers in PLA and UPR matrices, pull-out tests were performed, and the percentage of broken fibers was determined. The results showed that alkaline treatment improved the fibers’ physicochemical, mechanical, and thermal properties. In addition, the alkaline treatment was able to improve the adhesion behavior of coir and banana fibers to PLA and UPR matrices. The banana fibers showed a percentage of broken fibers of 100%, while the coir fibers showed a slight increase in IFSS value. This behavior is attributed to the improvement in surface roughness due to the removal of non-cellulosic composites and impurities.

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Section: Scanning Microscopymentioning

confidence: 83%

Investigation of the Effect of Chemical Treatment on the Properties of Colombian Banana and Coir Fibers and Their Adhesion Behavior on Polylactic Acid and Unsaturated Polyester Matrices

Barrera-Fajardo,

Rivero-Romero,

Unfried-Silgado

2024

Fibers

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Effect of olive-pruning fibres as reinforcements of alkali-activated cements based on electric arc furnace slag and biomass bottom ash

Gómez-Casero,

Sánchez-Soto,

Castro

et al. 2024

Archiv.Civ.Mech.Eng

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In this work, alkali-activated composites using electric arc furnace slag (50 wt%) and biomass bottom ash (50 wt%) were manufactured, adding olive-pruning fibres as reinforcement. The objective of adding fibres is to improve the flexural strength of composites, as well as to prevent the expansion of cracks as a result of shrinkage. For this reason, composites reinforced with olive-pruning fibres (0.5–2 wt%) untreated and treated with three different solutions to improve matrix–fibre adhesion were manufactured. Treatments developed over fibres were a 10 wt% Na2SiO3 solution, 3 wt% CaCl2 solution and 5 wt% NaOH solution. Mechanical properties, physical properties, thermal properties and the microstructure of composites by Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD) and scanning electron microscopy (SEM) were studied to demonstrate the improvement. Alkaline treatment degraded fibre surface, increasing the matrix–fibre adhesion, and as a consequence, flexural strength increased up to 20% at 90 days of curing. Optimal results were obtained with composites reinforced with 1 wt% of olive-pruning fibre treated by a 10 wt% Na2SiO3 solution. Higher quantity of olive-pruning fibre leads to local agglomeration, which weakens the matrix–fibre adhesion. The effect on the compressive strength is less evident, since the addition of fibres produces an admissible decrease (between 0 and 9% using 0.5 or 1 wt% of fibres), except in composites that use olive pruning treated with 10 wt% Na2SiO3 solution, where values remain stable, similar or better to control paste. A greater ductility of the matrix in all composites was observed. Furthermore, the alkali-activated cement matrix was bonded to olive-pruning fibre better than untreated fibre, as it is shown in SEM images. Thus, the results showed that olive-pruning fibres could be used as reinforcement in the manufacturing of alkali-activated materials when they are treated with alkali solutions.

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Reinforcement of alkali-activated cements based matrices using olive pruning fibres as an alternative to traditional fibres

Gómez-Casero,

Pérez-Villarejo,

Castro

et al. 2024

Sustainable Chemistry and Pharmacy

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Effect of alkali-silica treatments of miscanthus fibres on chemical and micro-morphological modifications

Cited by 4 publications

References 31 publications

Investigation of the Effect of Chemical Treatment on the Properties of Colombian Banana and Coir Fibers and Their Adhesion Behavior on Polylactic Acid and Unsaturated Polyester Matrices

Investigation of the Effect of Chemical Treatment on the Properties of Colombian Banana and Coir Fibers and Their Adhesion Behavior on Polylactic Acid and Unsaturated Polyester Matrices

Effect of olive-pruning fibres as reinforcements of alkali-activated cements based on electric arc furnace slag and biomass bottom ash

Reinforcement of alkali-activated cements based matrices using olive pruning fibres as an alternative to traditional fibres

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