Mechanical Properties of Natural Fiber Reinforced Foamed Concrete

Castillo-Lara, Joaquin F.; Flores‐Johnson, E.A.; Valadez-González, Alex; Herrera‐Franco, Pedro J.; Carrillo, J.G.; Gonzalez‐Chi, P.I.; Li, Q. M.

doi:10.3390/ma13143060

Cited by 80 publications

(42 citation statements)

References 39 publications

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“…The presented diagram confirms that, depending on many factors (e.g., foam addition pressure, which was different in these tests), the obtained results may be different. This is also confirmed by the results of other scientists; e.g., Castillo-Lara et al [83] obtained 1.42 ± 0.05 MPa for foamed concrete with density of 706 ± 8 kg/m 3 . Meanwhile, She et al [67] achieved 3.61 MPa for foamed concrete with 800 kg/m 3 .…”

Section: Compressive Strengthsupporting

confidence: 88%

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Characteristics of Lightweight Concrete Based on a Synthetic Polymer Foaming Agent

2020

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The components of foamed concrete have a significant effect on its properties. Protein-based foamed concrete is used much more often. This study aims to assess the properties of foamed concrete with a density of around 500, 700, 800 and 1000 kg/m3 formed by using a synthetic polymer-based foaming agent. The distribution of pores, wet and dry density and compressive strengths were evaluated. In addition, the creep deformations of foamed concrete with different densities were measured. The difference in density of up to 170 kg/m3 for the highest densities was obtained. Foamed concrete with higher densities (700 and 800 kg/m3) showed similar characteristics of pores, which were different from those of samples with a density of 500 kg/m3. Compressive strength equal to 5.9 ± 0.2, 5.1 ± 0.2, 3.8 ± 0.3 and 1.4 ± 0.2 MPa was obtained for foamed concrete with a density of 500, 700, 800 and 1000 kg/m3, respectively. The obtained compressive strengths were higher than those found in the literature for the foamed concrete with the same densities. With increasing density, smaller creep deformations were obtained. Creep deformations were 509, 495 and 455 με for samples with densities of around 500, 700 and 1000 kg/m3 respectively. Deformation under long-term loading took place up to 90 days, regardless of the density of the foamed concrete.

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Section: Compressive Strengthsupporting

confidence: 88%

“…Images showing the failure of foamed concrete samples with different densities are presented in Figure 8. The comparison image was obtained by Castillo-Lara et al [83] for unreinforced foamed concrete with 706 kg/m 3 density. Brittle behavior of foamed concrete specimens with higher density can be observed.…”

Section: Compressive Strengthmentioning

confidence: 99%

Characteristics of Lightweight Concrete Based on a Synthetic Polymer Foaming Agent

2020

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“…Foamed concrete (FC) has recently become widespread building material for thermal insulation and structural purposes [ 1 , 2 ]. FC’s growing interest caused its excellent thermal isolation performance, the ability to dispose of various waste and other important features.…”

Section: Introductionmentioning

confidence: 99%

Fibre-Reinforced Foamed Concretes: A Review

et al. 2020

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Foamed concrete (FC) is a high-quality building material with densities from 300 to 1850 kg/m3, which can have potential use in civil engineering, both as insulation from heat and sound, and for load-bearing structures. However, due to the nature of the cement material and its high porosity, FC is very weak in withstanding tensile loads; therefore, it often cracks in a plastic state, during shrinkage while drying, and also in a solid state. This paper is the first comprehensive review of the use of man-made and natural fibres to produce fibre-reinforced foamed concrete (FRFC). For this purpose, various foaming agents, fibres and other components that can serve as a basis for FRFC are reviewed and discussed in detail. Several factors have been found to affect the mechanical properties of FRFC, namely: fresh and hardened densities, particle size distribution, percentage of pozzolanic material used and volume of chemical foam agent. It was found that the rheological properties of the FRFC mix are influenced by the properties of both fibres and foam; therefore, it is necessary to apply an additional dosage of a foam agent to enhance the adhesion and cohesion between the foam agent and the cementitious filler in comparison with materials without fibres. Various types of fibres allow the reduction of by autogenous shrinkage a factor of 1.2–1.8 and drying shrinkage by a factor of 1.3–1.8. Incorporation of fibres leads to only a slight increase in the compressive strength of foamed concrete; however, it can significantly improve the flexural strength (up to 4 times), tensile strength (up to 3 times) and impact strength (up to 6 times). At the same time, the addition of fibres leads to practically no change in the heat and sound insulation characteristics of foamed concrete and this is basically depended on the type of fibres used such as Nylon and aramid fibres. Thus, FRFC having the presented set of properties has applications in various areas of construction, both in the construction of load-bearing and enclosing structures.

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“…Unlike artificial fibers, natural fibers (NFs) are eco-friendly, renewable, recyclable, and disposable, and have other advantages such as low cost, light-weight, and good mechanical properties [ 10 , 11 ]. Brittle materials reinforced with natural fibers exhibit equivalent mechanical performance as with synthetic fibers [ 12 , 13 , 14 ].…”

Section: Introductionmentioning

confidence: 99%

Reinforcing Mechanisms of Coir Fibers in Light-Weight Aggregate Concrete

et al. 2021

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Due to the requirement for developing more sustainable constructions, natural fibers from agricultural wastes, such as coir fibers, have been increasingly used as an alternative in concrete composites. However, the influence of coir fibers on the hydration and shrinkage of cement-based materials is not clear. In addition, limited information about the reinforcing mechanisms of coir fibers in concrete can be found. The goal of this research is to investigate the effects of coir fibers on the hydration reaction, microstructure, shrinkages, and mechanical properties of cement-based light-weight aggregate concrete (LWAC). Treatments on coir fibers, namely Ca(OH)2 and nano-silica impregnation, are applied to further improve LWAC. Results show that leachates from fibers acting as a delayed accelerator promote cement hydration, and entrained water by fibers facilitates cement hydration during the whole process. The drying shrinkage of LWAC is increased by adding fibers, while the autogenous shrinkage decreases. The strength and toughness of LWAC are enhanced with fibers. Finally, three reinforcement mechanisms of coir fibers in cement composites are discussed.

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Mechanical Properties of Natural Fiber Reinforced Foamed Concrete

Cited by 80 publications

References 39 publications

Characteristics of Lightweight Concrete Based on a Synthetic Polymer Foaming Agent

Characteristics of Lightweight Concrete Based on a Synthetic Polymer Foaming Agent

Fibre-Reinforced Foamed Concretes: A Review

Reinforcing Mechanisms of Coir Fibers in Light-Weight Aggregate Concrete

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