Mechanical Behavior of Geopolymeric Composites Reinforced with Natural Fibers

Trindade, Ana Carolina Constâncio; Arêas, Isadora O. M.; Almeida, Daniela C. T.; Alcamand, Himad Ahmed; Borges, Paulo Henrique Ribeiro; Silva, Flávio Alves da

doi:10.1007/978-94-024-1194-2_45

Cited by 6 publications

(5 citation statements)

References 12 publications

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“…They observed an ultimate tensile strength of 6.31 MPa and an ultimate flexural strength of 15.21 MPa whereas the modulus of elasticity was recorded at 14.92 GPa. They revealed that the jute-fiber-reinforced geopolymer composite exhibited a strain capacity of 28.34 mm [ 153 ].…”

Section: Geopolymers and Natural Fiber-reinforced Compositesmentioning

confidence: 99%

Geopolymers and Fiber-Reinforced Concrete Composites in Civil Engineering

et al. 2021

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This paper discusses the influence of fiber reinforcement on the properties of geopolymer concrete composites, based on fly ash, ground granulated blast furnace slag and metakaolin. Traditional concrete composites are brittle in nature due to low tensile strength. The inclusion of fibrous material alters brittle behavior of concrete along with a significant improvement in mechanical properties i.e., toughness, strain and flexural strength. Ordinary Portland cement (OPC) is mainly used as a binding agent in concrete composites. However, current environmental awareness promotes the use of alternative binders i.e., geopolymers, to replace OPC because in OPC production, significant quantity of CO2 is released that creates environmental pollution. Geopolymer concrete composites have been characterized using a wide range of analytical tools including scanning electron microscopy (SEM) and elemental detection X-ray spectroscopy (EDX). Insight into the physicochemical behavior of geopolymers, their constituents and reinforcement with natural polymeric fibers for the making of concrete composites has been gained. Focus has been given to the use of sisal, jute, basalt and glass fibers.

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Section: Geopolymers and Natural Fiber-reinforced Compositesmentioning

confidence: 99%

Geopolymers and Fiber-Reinforced Concrete Composites in Civil Engineering

et al. 2021

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“…Geopolymers exhibit a fragile behavior with low deformation capacity as is typical of ceramics 10 . The use of reinforcements has been well explored in distinct forms to enhance their strength and ductility, such as additions of: sand 10 and chamotte 10‐12 as particulate reinforcements; as well as incorporations of synthetic (PVA, 13 PE, 14 carbon, 15 glass, 16 steel 9 ), mineral (basalt 11,17 ) and natural (bamboo, 18 jute, 8 sisal 19 ) fibers. Basalt fibers appear to be an interesting compatible material to be incorporated into geopolymer binders due to their high tensile strength, alkali resistance, 11 durability, and resistance to elevated temperatures 16 …”

Section: Introductionmentioning

confidence: 99%

Mechanical behavior of K‐geopolymers reinforced with silane‐coated basalt fibers

2020

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Geopolymers are a well-known class of amorphous ceramic materials based on inorganic-polymers with high contents of alumina and silica (made from metakaolin and fumed silica). 1,2 They are manufactured under ambient temperatures through the combination of the aluminosilicate source with an alkali solution, based on Na or K, in a SiO 2 environment. 1,3 During curing in solution, they undergo distinct processes of formation via: (a) dissolution, (b) polycondensation; and (c) precipitation. 3,4 Several designs have been evaluated in the literature, 2,3,5,6 and their main formulation is based on M 2 O•Al 2 O 3 •xSiO 2 •yH 2 O 1,5 ; where M represents the alkali (Na or K); and x and y are determined according to the molar ratios desired. Their applications have been growing in recent years, encompassing different purposes and markets, such as: (a) fire-resistant structures; 3,7 (b) nuclear waste encapsulation 4,7 ; (c) alternatives to cement-based materials. 8,9

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“…Poletanovic et al [71] found that hemp fiber had no significant effects on the density, water absorption, compressive strength, and bending strength of the composite material, but significantly increased the toughness and energy absorption capacity of the material. Trindade et al [72] used sisal and jute single fibers as reinforcing materials and found that these fibers could change the brittleness of the matrix. Na et al [73] used alkali-treated kenaf fiber as the geopolymer reinforcement, which improved the toughness of the composite by 473%.…”

Section: Influence Of Different Kinds Of Fibers On the Mechanical Pro...mentioning

confidence: 99%

Effect of Wet–Dry Cycling on Properties of Natural-Cellulose-Fiber-Reinforced Geopolymers: A Short Review

Lv,

He,

Pang

et al. 2023

Molecules

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To study the long-term properties of cement-based and geopolymer materials exposed to outdoor environments, wet–dry cycles are usually used to accelerate their aging. The wet–dry cycling can simulate the effects of environmental factors on the long-term properties of the composites under natural conditions. Nowadays, the long-term properties of geopolymer materials are studied increasingly deeply. Unlike cement-based materials, geopolymers have better long-term properties due to their high early strength, fast hardening rate, and wide range of raw material sources. At the same time, natural cellulose fibers (NCFs) have the characteristics of abundant raw materials, low price, low carbon, and environmental protection. The use of NCFs as reinforcements of geopolymer matrix materials meets the requirements of sustainable development. In this paper, the types and properties of NCFs commonly used for geopolymer reinforcement and the polymerization mechanism of geopolymer matrix materials are summarized. By analyzing the properties of natural-cellulose-fiber-reinforced geopolymers (NCFRGs) under non-wet–dry cycles and NCFRGs under wet–dry cycles, the factors affecting the long-term properties of NCFRGs under wet–dry cycles are identified. Meanwhile, the degradation mechanism and mechanical properties of NCFRG composites after wet–dry cycles are analyzed. In addition, the relationship between the properties of composites and the change of microstructure of fiber degradation is further analyzed according to the results of microscopic analysis. Finally, the effects of wet–dry cycles on the properties of fibers and geopolymers are obtained.

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Mechanical Behavior of Geopolymeric Composites Reinforced with Natural Fibers

Cited by 6 publications

References 12 publications

Geopolymers and Fiber-Reinforced Concrete Composites in Civil Engineering

Geopolymers and Fiber-Reinforced Concrete Composites in Civil Engineering

Mechanical behavior of K‐geopolymers reinforced with silane‐coated basalt fibers

Effect of Wet–Dry Cycling on Properties of Natural-Cellulose-Fiber-Reinforced Geopolymers: A Short Review

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