Physical &amp; mechanical properties of fiber reinforced metakaolin-based geopolymer concrete

Moradikhou, Amir Bahador; Esparham, Alireza; Avanaki, Mohammad Jamshidi

doi:10.1016/j.conbuildmat.2020.118965

Cited by 93 publications

(42 citation statements)

References 44 publications

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“…The flexural strength for samples with 1% addition of fibers was 9 MPa and for samples without reinforcement and with 0.5% fibers addition it was below 7.2 MPa [78]. Recently also the hybrid composition included PP and glass fibers [79] and compositions with PP and PO fibers are investigated [80].…”

Section: Use Of Synthetic Fibers In Hybrid Reinforcementmentioning

confidence: 99%

Mechanical Properties of Short Polymer Fiber-Reinforced Geopolymer Composites

2020

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The article describes the state of the art in reinforced geopolymers, taking into consideration various types of polymer fiber reinforcements, such as polypropylene, polyethylene, or polylactic acid. The description is focused on the usage of polymer short fibers and the mechanical properties of the geopolymer composites. However, to show a wider research background, numerous references are discussed concerning the selected studies on reinforcing geopolymer composites with long fibers and fabrics. The research method applied in the article is the critical analysis of literature sources, including a comparison of new material with other materials used in similar applications. The results of the research are discussed in a comparative context and the properties of the composites are juxtaposed with the properties of the standard materials used in the construction industry. Potential applications in the construction industry are presented. Moreover, the contemporary research challenges for geopolymer materials reinforced with fibers are presented.

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Section: Use Of Synthetic Fibers In Hybrid Reinforcementmentioning

confidence: 99%

Mechanical Properties of Short Polymer Fiber-Reinforced Geopolymer Composites

2020

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“…(GP with 1% SF) The applied load and counterweight amount necessary for creep test stands were calculated, considering the compressive strength values represented in Table 1. As Moradikhou states [27], the compressive strength improvement due to fiber incorporation is slight. However, with 5% PPF and 1% SF incorporation, the compressive strength is significantly lower.…”

Section: Resultsmentioning

confidence: 88%

Long-Term Properties of Different Fiber Reinforcement Effect on Fly Ash-Based Geopolymer Composite

et al. 2021

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Geopolymer composites have been around only for 40 years. Nowadays, they are used in buildings and infrastructures of various kinds. A geopolymer’s main benefit is that it is a green material that is partially made by utilizing waste products. The carbon footprint from geopolymer matrix manufacturing is at least two times less than Portland cement manufacturing. Due to the nature of the geopolymer manufacturing process, there is a high risk of shrinkage that could develop unwanted micro-cracks that could reduce strength and create higher creep strains. Because of this concern, a common strategy to reduce long-term strains of the material, such as shrinkage and creep, is to add fiber reinforcement that would constrain crack development in the material. This article aims to determine how various kinds and amounts of different fiber reinforcement affect fly ash-based geopolymer composites’ creep strains in compression. Specimen mixes were produced with 1% steel fibers, 1% polypropylene fibers, 5% polypropylene fibers, and without fibers (plain geopolymer). For creep and shrinkage testing, cylindrical specimens Ø46 × 190 mm were used. The highest creep resistance was observed in 5% polypropylene fiber specimens, followed by 1% polypropylene fiber, plain, and 1% steel fiber specimens. The highest compressive strength was observed in 1% polypropylene fiber specimens, followed by plain specimens, 1% steel fiber specimens, and 5% polypropylene fiber-reinforced specimens. The only fiber-reinforced geopolymer mix with improved long-term properties was observed with 1% polypropylene fiber inclusion, whereas other fiber-introduced mixes showed significant decreases in long-term properties. The geopolymer composite mix with 1% polypropylene fiber reinforcement showed a reduction in creep strains of 31% compared to the plain geopolymer composite.

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“…Higher PP fiber content decreased compressive strength due to workability issue. Decrease in workability weakens the interaction between fibers, causes voids in the binder matrix, and leads to defects in interfacial transition zones, resulting in a decrease in compressive strength 9,12,76–79 . It has been reported in various studies that addition fibers at optimum ratio increases the compressive strength of GPC 9,12,39 .…”

Section: Resultsmentioning

confidence: 99%

“…Decrease in workability weakens the interaction between fibers, causes voids in the binder matrix, and leads to defects in interfacial transition zones, resulting in a decrease in compressive strength. 9,12,[76][77][78][79] It has been reported in various studies that addition fibers at optimum ratio increases the compressive strength of GPC. 9,12,39 GPC samples with 6 mm length PP fibers exhibited higher compressive strength.…”

Section: Compressive Strengthmentioning

confidence: 99%

Influence of fiber characteristics on sulfate resistance of ambient‐cured geopolymer concrete

Kantarcı

2022

Structural Concrete

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The brittle nature of geopolymer concretes (GPCs) and curing process required in their production are factors that limit their practical applications. It was not detected any study investigating the effect of polypropylene (PP) fiber length and fiber content on sulfate resistance of GPC. The aim of this study is to investigate the effect of PP fibers used in different content and length on sulfate resistance of GPC cured under laboratory conditions. For this purpose, 6 and 12 mm length PP fibers were added to GPC at rate of 0.5, 1.0, and 1.5% by volume of concrete. Samples were cured in laboratory conditions for 28 days, and then exposed to 5% MgSO 4 solutions. After the sulfate effect, the changes in physical and mechanical properties of GPC such as compressive strength, tensile strength, weight, ultrasonic pulse velocity (UPV), apparent porosity, and external appearance were investigated. In addition, microstructural analyzes were carried out with scanning electron microscope (SEM). As a result, it was determined that PP fiber additive at rate of 0.5% by volume significantly increased the sulfate resistance by preventing crack growth thanks to bridging function occur between binder phase and interface regions. Since the increased fiber length made it difficult to distribute the fibers homogeneously, 6 mm long PP fibers were more effective in improving the sulfate resistance.

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Physical & mechanical properties of fiber reinforced metakaolin-based geopolymer concrete

Cited by 93 publications

References 44 publications

Mechanical Properties of Short Polymer Fiber-Reinforced Geopolymer Composites

Mechanical Properties of Short Polymer Fiber-Reinforced Geopolymer Composites

Long-Term Properties of Different Fiber Reinforcement Effect on Fly Ash-Based Geopolymer Composite

Influence of fiber characteristics on sulfate resistance of ambient‐cured geopolymer concrete

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