Influence Of Fiber Type Research Articles

Influence of Fiber Type on Electrical, Thermal and Mechanical Properties of Glass Fiber Reinforced Polymer Composites for Insulation Panel Applications

Influence of Fiber Type on Electrical, Thermal and Mechanical Properties of Glass Fiber Reinforced Polymer Composites for Insulation Panel Applications

High-strength fiber-reinforced concrete: assessing the impact of polyvinyl alcohol, glass, and polypropylene fibers on structural integrity and cost efficiency

This study delves into the realm of high-strength fibre reinforced concrete (HSFRC), a pivotal material in contemporary construction, with a focus on elucidating its mechanical robustness and durability enhancements facilitated by fibre reinforcement. Previous research on HSFRC has provided mixed results and often neglected the cost implications. However, this study incorporates an array of fibres, encompassing steel, polypropylene, and polyvinyl alcohol, in varied proportions as well as their cost implications to provide a comprehensive evaluation of their impact. Through standardized tests such as compression strength, splitting-tensile strength, flexure strength, water permeability, and ultrasonic pulse velocity tests, alongside an exhaustive cost–benefit analysis, the study uncovers the substantial influence of fiber type and proportion on HSFRC 's properties. Noteworthy findings indicate that both fiber type and fiber ratio can change the strength and durability properties of concrete considerably, however, the use of 1.5% glass fiber gives the best results, in improving the properties of HSC. Moreover, despite the initial higher costs associated with HSFRC production, its protracted durability and diminished maintenance requisites yield substantial long-term economic advantages. Consequently, it is inferred that judicious selection of fiber types and proportions plays a pivotal role in maximizing the performance and cost-effectiveness of HSFRC, thereby advocating for its broader integration within the construction sector. Subsequent research endeavours should concentrate on fine tuning fiber content and types to further elevate HSFRC 's properties.

Void geometry analysis and multifaceted characterisation of cementitious mortar reinforced with short carbon and glass fibres – A comparative study

This paper presents comprehensive experimental and numerical studies on void analysis, durability performance, electrical properties, and microstructural behaviour of fibre-reinforced cementitious composites (FRCC) with varying short carbon and glass fibre volume fractions. Durability and electrical properties are evaluated based on the hydrochloric acid effect, water absorption, drying shrinkage and electrical resistivity changes over time. The incorporation of CF and GF remarkably limits drying shrinkage, primarily attributed to the bridging and bonding effects of fibres within the matrix. The addition of 1.0 % carbon fibre significantly decreases the electrical resistivity and improves acid resistance performance. Furthermore, for the first time, the influence of fibre type and quantity on the formation of elongated and eccentric voids is investigated by using X-ray computed tomography (micro-CT). The results demonstrate that higher porosity leads to lower strength and durability performance, while a greater occurrence of elongated voids contributes to increased length change in shrinkage.

Influence of fiber types on the properties of the artificial cold-bonded lightweight aggregates

Abstract The cold-bonded pelletizing method is often employed in aggregate production since it uses less energy and helps reduce issues with gas emissions, contributing to economic and environmental benefits. In this study, fly ash was chosen as the raw material and used to partially replace cement in manufacturing artificial aggregate. Three types of fibers (polypropylene, polystyrene, and glass fiber) in different volume fractions were used to investigate their effect on the properties of the artificial cold-bonded lightweight aggregate. After the manufacturing process, aggregates were cured with a 28-day water curing. Their specific gravity, water absorption, density, impact value, and crushing value were tested to analyze the properties of the cold-bonded artificial aggregate. Results show that adding various volume fractions of PS, glass, and PP fibers during pelletization caused a more stable generation of aggregates with enhanced mechanical and physical properties.

Study on the relationship between the double-sided shear strength of ECC and the critical fracture toughness of mode II

To avoid the risk of Type II fracture failure in building structures under pure shear forces, which involves complex experimental elements and is difficult to effectively control. Therefore, studying the relationship between shear strength and type II critical fracture toughness has become particularly crucial. This article studied the uniaxial ultimate tensile strength, cubic compressive strength, double-sided shear strength, and type II critical fracture toughness of ECC using different mix proportions. The results showed that the initiation strength σfti and ultimate tensile strength σftu of ECC with different ratios were found to be M10 > M1 > M2 > M8 > M3 through tensile tests; The compressive strength of ECC cubes with different mix ratios was obtained as M10 > M1 > M8 > M2 > M3, and compared with Nissan fibers, it was found that the influence of fiber types on the compressive strength of ECC was not significant; Linear fitting was performed on the tensile strength, cubic compressive strength, and double-sided shear strength of ECC, and strong correlations were found. The linear fitting coefficient R2 between shear strength and critical fracture toughness is as high as 0.98, indicating that this fitting relationship curve can further understand the mutual influence between shear strength and critical fracture toughness of ECC at different stress levels, and estimate complex Type II fracture toughness through relatively simple shear strength fs, which helps predict the bearing capacity of the structure and provides theoretical support for the improvement and optimization design of ECC.

Investigating the influence of fibre type and content on the toughness and ductility of geopolymer mortar with acoustic emission technology

The in-depth investigation on the toughness and ductility strengthening mechanism by fibres is essential to efficiently design geopolymer composites with high toughness and ductility. This paper investigates the influence of fibre type (steel and PP fibre) and fibre content (0 %, 0.5 %, 1.0 %, and 1.5 %) on the flexural performance of geopolymer mortar (GPM) with acoustic emission (AE) technology. The results reveal that GPM specimens with steel fibre exhibit higher ultimate flexural strength compared to those with PP fibre. Additionally, both flexural toughness and ductility of GPM specimens exhibit an increasing trend with fibre content. A novel finding is that steel fibre displays a greater sensitivity to external load than PP fibre, which explains the distinctive load-deflection characteristics observed in GPMs with steel and PP fibre. Furthermore, steel fibre is found to be more advantageous in improving flexural strength and toughness, while PP fibre exhibits a more favourable effect on enhancing ductility. The AE results confirm that the bond strength between matrix and steel fibre is higher than that between PP fibre and matrix. Moreover, the inclusion of PP and steel fibre increase the proportion of shear cracks caused by fibre-matrix debonding and fibre pullout. These increasing shear cracks are responsible for tortuous flexural paths in fibre-reinforced GPMs. Significantly, the flexural toughness of GPMs with fibres are found to exhibit a positive correlation with the proportion of shear cracks. These findings can contribute to the optimization of GPM design for various applications where enhanced toughness and ductility are required.

Comprehensive analysis of 3D printed PA6.6 and fiber‐reinforced variants: Revealing mechanical properties and adhesive wear behavior

AbstractWhile 3‐dimensional (3D) printing technology is advancing rapidly, commonly used filament materials are struggling to meet growing expectations. Polyamide (PA) is a material with high potential to replace commonly used low‐performance filament materials, thanks to its cost‐effectiveness and optimal material properties compared to advanced engineering materials. To explore this potential, the thermal, thermomechanical, and mechanical properties (at different temperatures), as well as the wear characteristics, of PA, short carbon fiber reinforced‐PA (SCFR‐PA), and short glass fiber reinforced‐PA (SGFR‐PA) filaments were comparatively examined in this study. Differential scanning calorimeter analysis (DSC), Dynamic Mechanical Thermal Analysis (DMA), uniaxial tensile tests, and Shore D hardness tests were conducted on the 3D printed specimens. The yield strength decreased by 48% and 73%, respectively, for neat PA as compared to room temperature when tested at 40 °C and 60 °C, while for SCFR‐PA, it decreased by 40% and 60%, and for SGFR‐PA, it decreased by 33% and 48%, respectively. The findings obtained from wear tests conducted on both bottom and top surfaces have demonstrated that glass reinforcement yields better results than carbon reinforcement. The experimental findings have been compared with SEM images, revealing their consistency.Highlights This study focuses on the performance evaluation of 3D printed PA and its composites. The mechanical properties of the materials at different temperatures were compared. Adhesive wear behavior is not directly related to fiber type, wear surface or hardness. Morphological analysis was conducted to elucidate the influence of fiber type on mechanical properties and wear behavior.

Study on axial compressive behavior and stress–strain relationship of fiber-reinforced alkali-slag recycled concrete

Fiber-reinforced alkali-slag recycled concrete, a novel green building material with high-efficiency solid-waste utilization, can effectively utilize waste slag and recover coarse aggregates. However, no relevant research has been conducted on the mechanical properties under axial compression. Therefore, this study investigated the influence of fiber type, fiber content, and recycled coarse aggregate content on the axial compression mechanical properties of fiber-reinforced alkali-slag recycled concrete. The results show that an appropriate amount of steel, basalt, and polypropylene fibers can effectively improve the axial compressive strength, peak compressive strain, and elastic modulus of alkali-activated slag recycled concrete. The axial compressive strength, peak compressive strain, and elasticity can be enhanced by 10.6–31.9%, 26.0–29.3%, and 1.4–69.1%, respectively. Basalt fibers had the worst effect, while steel fibers had the best effect. A small proportion of recycled coarse aggregate can slightly increase the axial compressive strength and peak compressive strain while significantly reducing the elastic modulus. An axial compression stress–strain model of the fiber-reinforced alkali-slag recycled concrete was established. These results provide basic theoretical support for the comprehensive and effective exploitation of waste slag and building waste.

Influence of Fiber Types on the Mechanical Properties and Physical Behavior of Polymer-Based Repair Mortars

Influence of Fiber Types on the Mechanical Properties and Physical Behavior of Polymer-Based Repair Mortars

Effect of Different Natural Fibers on Mechanical and Disintegration Properties of Compostable Biobased Plastics

ABSTRACT This study evaluates the economic and degradation properties of natural fiber-reinforced PHBH (Poly(3-hydroxybutyrate-co-3-hydroxyhexanoate)). Compounds containing the compostable biobased plastic PHBH and 30 mass% of cotton, merino wool, wood fibers, and hemp fibers were produced, and 0.4 mm thick foils were manufactured using a laboratory hot press. Samples for mechanical characterization were produced by injection molding and were buried in bioactive soil for 16 weeks to determine the influence of fiber type on the disintegration speed in soil. The disintegration was measured by subsequent excavation, determination of dry mass loss and visual inspection. All kinds of natural fibers generally improve disintegration speed. The most significant improvement was reached by samples containing cotton and wool, respectively, which experienced similar mass loss, followed by the ones containing hemp fibers. The smallest increase in disintegration speed was achieved by samples containing wood fibers. Mechanical properties and cost-saving potential increased in the cotton and hemp samples. * Long version of a presentation at Composites Meet Sustainability – Proceedings of the 20th European Conference on Composite Materials, ECCM20. 26–30 June, 2022, Lausanne, Switzerland

Study on Mechanical and Flow Properties of Cemented Sulfur Tailings Backfill Considering the Influence of Fiber Type, Fiber Content and Addition Method

Previous studies have confirmed that for cemented tailings backfill, mechanical properties are improved through the addition of fiber. However, for fiber-reinforced cemented sulfur tailings backfill (FRCSTB), physical and flow properties are still unknown. In this paper, the changes in fluidity, splitting tensile strength (STS) and uniaxial compressive strength (UCS) of cemented sulfur tailings backfill (CSTB) are analyzed in detail. Secondly, regarding the addition of glass fiber and polypropylene fiber, the changes in the fluidity, STS and UCS of the CSTB, resulting from the fiber length, fiber content and method of fiber addition used, were analyzed. Moreover, the relationship between the UCS and fiber content is established. Finally, the mechanism behind the influence of fiber and sulfur content on the mechanical properties of CSTB is revealed. The results indicate that with the increase in sulfur content, the fluidity of the tailings slurry exhibits exponential growth. During the process of increasing sulfur content, the UCS and STS of CSTB initially increase and then decrease, reaching maximum values at 12% sulfur content. Similarly, at a fiber content of 0.6%, the UCS and 28d STS of CSTB reach their maximum values. In terms of enhancing the mechanical properties of CSTB, the effectiveness of glass fibers surpasses that of polypropylene fibers. In addition, regarding the improvement of the UCS of CSTB, the mixed addition of fibers is obviously worse than that of fiber alone. However, in terms of enhancing the STS of CSTB, the mixed addition of fibers outperforms the single addition of polypropylene fiber. From a microscopic perspective, polypropylene and glass fiber are able to form strong cohesion with the cement–tailings matrix and effectively prevent the formation and expansion of pores and cracks.

Influence of Fiber Type on the Performance of Reinforced Concrete Beams Made of Waste Aggregates: Experimental, Numerical, and Cost Analyses

The structural performance of concrete structures requires swelling the bending and shear characteristics of reinforced concrete (RC) beams. The bending characteristics of RC beams consisting of waste granite aggregate (WGA), steel fibers (SF), polypropylene fibers (PF), and glass fibers (GF) are assessed in this research. Twenty-one 2,000 mm×200 mm×250 mm RC beams were cast and tested. WGA was sorted and utilized instead of natural coarse aggregates (NA), with three mass replacement fractions: 0%, 50%, and 100%. Besides, SF, PF, and GF were utilized separately at three fractions of 0%, 0.5%, and 1%. Beams were loaded under a four-point bending arrangement, and the ultimate bending resistance, deformability, stiffness and crack development were recorded and assessed. Also, an evaluation of experimental results and existing design standards in terms of maximum crack width has been carried out. Moreover, a cost-sensitivity examination has been made to analyze the effectiveness of using various fibers in terms of cost. Experiments revealed that the impact of PF on enhancing the load-bearing capability of beams with WGA was greater than that of strengthened with SF and GF. However, the impact of GF on the ultimate deformability of WGA RC beam samples was superior to that of PF and SF. PF has a greater influence on enhancing the flexural capacity of RC beams than SF; nevertheless, SF has a greater influence on deformation. The ductility and deformability of RC beams were substantially enhanced when GF was introduced in specimens made with WGA.

Fine-grаined fiber concrete using polypropylene аnd bаsаlt fibers

The purpose of the study is to evаluаte the effect of fibers on the bending strength of fine-grаined concrete sаmples. The results of experimentаl studies of polypropylene аnd bаsаlt fibers for dispersion reinforcement of concrete аre considered. The strength chаrаcteristics of fiber concrete of different compositions hаve been determined. The regulаrities of the influence of fiber type аnd concentrаtion on the strength chаrаcteristics of fiber concrete аre reveаled. The results of determining the bending strength of fine-grаined fiber concrete without аdding fiber (control composition) аnd with the аddition of polypropylene fiber 0.1, 0.5, 1.5, 2.5% of the weight of cement аnd bаsаlt 0.05, 0.1, 0.2, 0.5% of the weight of cement аre presented. It is shown thаt the optimаl limits of the introduction of polypropylene fiber in the mixture of fine-grаined concrete cаn be considered 0.5 % by weight of cement. The introduction of bаsаlt fiber in the mixture of fine-grаined concrete in аn аmount of 0.1 % of the weight of cement cаn increаse the bending tensile strength.

Influence of fiber type and amount of reinforcing fibers on radon exhalation in uranium tailings’ overburden under high temperature environment

Influence of fiber type and amount of reinforcing fibers on radon exhalation in uranium tailings’ overburden under high temperature environment

Influence of Fiber Type and Dosage on Tensile Property of Asphalt Mixture Using Direct Tensile Test.

In engineering practice, fiber addition is a frequently used method to improve the tensile property of asphalt mixture. However, the optimum fiber type and dosage have not been determined by direct tensile tests. In this paper, monotonic tensile tests were conducted on three kinds of stone mastic asphalt (SMA13) mixtures, that is, granular-lignin-fiber-reinforced SMA (GFSMA), flocculent-lignin-fiber-reinforced SMA (FFSMA), and basalt-fiber-reinforced SMA (BFSMA) at different fiber dosages to probe the influence of fiber dosage on their tensile mechanical indexes (tensile strength, ultimate strain, elastic modulus, and strain energy density) and to determine the optimum dosage of each kind of fiber. The results showed that with the elevation of fiber dosage, the tensile strength, elastic modulus, and strain energy density of all three kinds of asphalt mixtures increased first and then decreased, while the ultimate strain increased constantly. The optimum dosage was 0.50 wt%, 0.45 wt%, and 0.50 wt% for granular lignin fiber, flocculent lignin fiber, and basalt fiber, respectively. On this basis, strain-controlled direct tensile fatigue tests were conducted on the three kinds of asphalt mixtures at the corresponding optimum fiber dosage. The results indicated that asphalt mixture reinforced with 0.50 wt% granular lignin fiber exhibited ideal direct tensile fatigue performance with respect to fatigue life and accumulative dissipated energy. Therefore, granular lignin fiber is recommended as the favorable fiber type, and its optimum dosage is 0.50 wt%. Moreover, scanning electron microscopy (SEM) demonstrated that the essence of the impact of fiber dosage and type on the tensile property of SMA is whether the reinforcement effect on the mixture matrix outweighs the negative effect of the defects between fiber and mixture matrix, or whether the reverse applies.

Influence of fiber type and carbohydrase supplementation on nutrient digestibility, energy and nitrogen balance, and physiology of sows at mid and late gestation.

Carbohydrase supplementation in grow-finish pig diets improves energy, nutrient digestibility, and gastrointestinal function, but their efficacy in gestation diets is understudied. The experimental objective was to evaluate the efficacy of a multicarbohydrase to improve digestion, energetics, and various physiological functions in gestating sows fed soluble and insoluble fiber diets. On day 28 of gestation, 36 sows (186 ± 4.6 kg body weight), blocked by parity, were randomly assigned to a 2 × 2 factorial arrangement of dietary treatments (n = 9). Factors included fiber type of insoluble (IF; 20% dried distiller grains with solubles) or soluble fiber (SF; 20% sugar beet pulp) and with (+) or without (-) enzyme (0.05%, Rovabio Advance P10; Adisseo, Antony, France). Diets were fed from days 28 to 109 of gestation at a feeding level of 2.1 kg (SID-Lys 11 g/d and 4.5 net energy-Mcal/d). Two separate 9-d metabolism periods were conducted on days 50 to 59 (mid) and 99 to 108 (late) of gestation. During each period, days 1 to 3 served as an adaptation period, days 4 to 7 total urine and feces were collected (96-h) and followed by a 48-h lactulose-mannitol study. Serum and plasma were collected on days 50 and 99. Data were analyzed as repeated records using a linear mixed model with block as a random effect and fiber type, enzyme, and period and their interactions as fixed effects. Sows fed SF+ had increased serum IL-1ra (Fiber × Enzyme P = 0.035), and IL-2 (Fiber × Enzyme P = 0.042). In the presence of IF, multicarbohydrases increased serum lipopolysaccharide-binding protein, but not when supplemented with SF (Fiber × Enzyme P = 0.028). Circulating IL-8 and TNF-α were decreased in sows fed multicarbohydrases (P < 0.05). Multicarbohydrase supplementation increased the apparent total tract digestibility (ATTD) of gross energy (GE), dry matter, and neutral detergent fiber by 2.8%, 3.4%, and 8.3%, respectively (P < 0.05). Compared to IF-, the ATTD of hemicellulose was 5.3% greater in sows fed IF+ but did not differ from SF- and SF+ (Fiber × Enzyme P = 0.037). Sows fed IF+ had the greatest ATTD of insoluble dietary fiber (Fiber × Enzyme P = 0.011). Sows fed multicarbohydrases excreted less energy in their urine (519 vs. 469 GE kcal/d; Enzyme P = 0.033) and in their feces (985 vs. 900 GE kcal/d; Enzyme P = 0.003). This resulted in an improvement in both digestible energy (Enzyme P < 0.01) and metabolizable energy (Enzyme P = 0.041), irrespective of fiber type. In conclusion, multicarbohydrase supplementation increased the digestibility and energetic contribution of fiber, irrespective of adaptation time or fiber type, but modulation of inflammatory responses was unique to dietary fiber type.

Influence of fibres characteristics on the engineering properties of geopolymer concrete- a review

Growing environmental consciousness in the construction sector encourages the utilization of alternate binders to partially or completely replace ordinary Portland cement (OPC), as its manufacturing generates CO2, which pollutes the environment. Geopolymer concrete (GPC) have emerged as an environmentally acceptable construction material because it can be prepared using industrial wastes, thereby minimizing CO2 emissions and utilizing the wastes which would otherwise become sources of pollution. Apart from environmental benefits, GPC is more durable and shows better mechanical properties than OPC-based concrete. However, GPC exhibits quasi-brittle behavior. To address this shortcoming, numerous studies have been carried out on the development, evaluation, and deployment of fiber reinforcement in GPC. In this article, the state-of-the-art of fiber-reinforced GPC is addressed, with an emphasis on the influence of fiber type, dosage, aspect ratio, etc., on the engineering properties. Based on the literature review, challenges and future prospects have also been discussed. The goal of this research is to develop a solid scientific and conceptual understanding of fiber-reinforced GPC, which will aid in the selection of the most efficient fiber for various GPC construction applications.

微胶囊-纤维水泥基复合材料的动态压缩性能

The microcapsule-based self-healing cementitious materials have good repaire performance. However, the mechanical performance is weakened due to the introduction of microcapsules. The addition of fibers can improve the cracking performance and form an effective complement to the microcapsules. In order to study the influence of fiber type and strain rate on the compressive properties of microcapsule self-healing cement-based materials, we design three strain rate loading tests are on experimental specimens of three mix proportion types, namely polyvinyl alcohol (PVA) fibers, polyamide (PA) fibers and PVA-PA hybrid fibers through the cube compression test and the split Hopkinson pressure bar (SHPB) test. The results show that when the strain rate is <inline-formula><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" id="M2"><mml:msup><mml:mrow><mml:mn mathvariant="normal">10</mml:mn></mml:mrow><mml:mrow><mml:mo>-</mml:mo><mml:mn mathvariant="normal">5</mml:mn></mml:mrow></mml:msup><mml:mtext> </mml:mtext><mml:msup><mml:mrow><mml:mi mathvariant="normal">s</mml:mi></mml:mrow><mml:mrow><mml:mo>-</mml:mo><mml:mn mathvariant="normal">1</mml:mn></mml:mrow></mml:msup></mml:math></inline-formula>, the compressive strength of self-healing cement-based materials decreases by 12.96%, 8.91% and 9.03% after adding PVA, PA and PVA-PA, respectively. With the increase of the strain rate, the compressive strength of the material increases, and the dynamic growth factor of the material has a linear relationship with the strain rate. At low strain rate, fibers can improve the energy absorption capacity of the material. The dissipated energy and energy dissipation factor are improved. This study could provide experimental basis for improving self-healing performance of concrete materials under dynamic conditions.

Fresh and hardened properties of high-performance fiber-reinforced concrete containing fly ash and rice husk ash: Influence of fiber type and content

Fresh and hardened properties of high-performance fiber-reinforced concrete containing fly ash and rice husk ash: Influence of fiber type and content

Fracture performance of fibre-reinforced epoxy foam

Low density aramid and carbon fibre-reinforced epoxy foam has been synthesised with the aim of improving mechanical properties, principally fracture performance. The foam properties measured were fracture energy, compressive strength, and density. The influence of fibre type, loading, and length was investigated. In addition, composite face-sheet bond tests were performed to ascertain how effective toughness transferred from individual component to composite structure. In general, the addition of fibres improved the mechanical performance of reinforced samples compared to the control foam. Increases in compressive strength were moderate whilst fracture energy was increased by up to 107% from 124 J/m2 to 256 J/m2 by the addition of 0.75 mm aramid fibres. Increased fracture energy of the foam and the presence of fibres on the foam surface, caused an increase in face-sheet bond propagation fracture toughness of 50% from 277 J/m2 to 416 J/m2.