Alena Sicakova; Viola Hospodarova; Nadezda Stevulova; Vojtech Vaclavik; Tomas Dvorsky
Abstract
In this paper, the experimental work providing the testing of cement mixture containing two types of cellulosic fibers, namely fibers from bleached wood pulp and recycled waste paper fibers, is given. Fibers are described by selected characteristics such as length, density, and pH. They were applied ...
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In this paper, the experimental work providing the testing of cement mixture containing two types of cellulosic fibers, namely fibers from bleached wood pulp and recycled waste paper fibers, is given. Fibers are described by selected characteristics such as length, density, and pH. They were applied as additive to the cement composite/plaster while they were dosed in different amounts: 0.2 %, 0.3 % and 0.5 % of the weight of both the filler and binder. Mixtures without fibers were prepared as reference samples. Density, water absorption, thermal conductivity, flexural and compressive strength were studied following by analyses of differences between resulting values. The observed differences in the physical, mechanical and thermal properties were found to be influenced by the properties (such as type, amount and other characteristics) of cellulosic fibers.
Noor Md. Sadiqul Hasan; Habibur Rahman Sobuz; Abubakar Sharif Auwalu; Nafisa Tamanna
Abstract
This paper investigates of an experimental research that was conducted to study the effect of natural kenaf fiber on concrete production which implements in the sustainable construction industry as a low-cost material. Concrete produced with kenaf fiber reinforced concrete (KFRC) with fiber volume contents ...
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This paper investigates of an experimental research that was conducted to study the effect of natural kenaf fiber on concrete production which implements in the sustainable construction industry as a low-cost material. Concrete produced with kenaf fiber reinforced concrete (KFRC) with fiber volume contents are increasing 0%, 1%, 3% and 5% in the mix proportions. The concrete fresh properties consisting slump and density are determined in the laboratory. The compressive strength, compacting factor test, modulus of rupture, surface strength, and direct shear test of KFRC specimens are investigated and compared to the properties of conventional concrete specimens. A total number of 36 concrete cubes with the size of 150 mm x 150 mm x 150 mm were tested for compressive strength, 36 Concrete beams with the size of 100 mm x 100 mm x 350 mm were tested for flexural strength, and also 36 concrete small beams with the size of 100 mm x 100 mm x 350 mm were tested for direct shear test. All of the specimens were cured for 7, 14 and 28 days before testing. The experimental results indicate that the mechanical and fresh properties of KFRC are decreased then the conventional concrete specimens with the increased of kenaf fiber content. It is also observed that the additions of fiber decreased the ultimate load of the concrete for compressive strength, modulus of rupture and direct shear test. However, kenaf fiber concrete enhanced more toughness and ductility behaviour compared with the conventional concrete. Finally, it concluded that kenaf fiber is a suitable material that could potentially be used to produce low-cost ‘green’ concrete which has higher toughness and reduce the cracking propagation in the concrete structural applications.
Satnam Singh; Pardeep Kumar;S.K. Jain
Abstract
Composites are one of the most advanced and adaptable engineering materials. The strength of any composite depends upon volume/weight fraction of reinforcement, L/D ratio of fibers, orientation angles and other factors. The present work focuses on determination of mechanical properties of pure epoxy ...
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Composites are one of the most advanced and adaptable engineering materials. The strength of any composite depends upon volume/weight fraction of reinforcement, L/D ratio of fibers, orientation angles and other factors. The present work focuses on determination of mechanical properties of pure epoxy and random oriented glass fiber (mat) reinforced epoxy at 10% and 20% weight fractions of glass fibers. The test specimens were prepared and tested according to ASTM standards. The experimental results revealed that with increase in weight fraction of reinforcement, the tensile strength and flexural strength increased by 14.5 % and 123.65% for 20 % glass reinforced composites over pure epoxy. The numerical results obtained were in good agreement to the experimental results. However increased reinforcement increases the brittleness of material which may results in low impact strength. This study further can be used to optimize the weight fraction of glass fibers, to achieve a combination of strength without compromising the impact strength of composites.