Investigation of Mechanical and Microstructural Properties of Fiber-Reinforced Geopolymer Concrete with GGBFS and Metakaolin: Novel Raw Material for Geopolymerisation

Reddy, K. Chandrasekhar

doi:10.1007/s12633-020-00780-z

Cited by 10 publications

(7 citation statements)

References 20 publications

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“…According to [ 87 ], better compression strength is shown by higher-grade geopolymer concrete, which implies that water absorption must be significantly reduced. Cement concrete absorbed 2.6% of the water.…”

Section: Resultsmentioning

confidence: 99%

“…As a result, geopolymerisation was hindered, which had an adverse effect on compressive strength. According to [ 87 ], a MK-GGBFS/CFR geopolymer was subjected to SEM examination at the age of one day. The findings indicate that the primary constituents of the geopolymer are alumina, silica, and iron.…”

Section: Resultsmentioning

confidence: 99%

“…According to [ 87 ], when compared to other fillers, GGBFS is off-white and thus produces excellent cement concrete. GGBFS is made from iron, a by-product of blast furnaces.…”

Section: Methodsmentioning

confidence: 99%

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A Review on Fresh, Hardened, and Microstructural Properties of Fibre-Reinforced Geopolymer Concrete

Baskar¹,

Annadurai²,

Sekar³

et al. 2023

Polymers

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Alternative eco-friendly and sustainable construction methods are being developed to address growing infrastructure demands, which is a promising field of study. The development of substitute concrete binders is required to alleviate the environmental consequences of Portland cement. Geopolymers are very promising low-carbon, cement-free composite materials with superior mechanical and serviceability properties, compared to Ordinary Portland Cement (OPC) based construction materials. These quasi-brittle inorganic composites, which employ an “alkali activating solution” as a binder agent and industrial waste with greater alumina and silica content as its base material, can have their ductility enhanced by utilising the proper reinforcing elements, ideally “fibres”. By analysing prior investigations, this paper explains and shows that Fibre Reinforced Geopolymer Concrete (FRGPC) possesses excellent thermal stability, low weight, and decreased shrinking properties. Thus, it is strongly predicted that fibre-reinforced geopolymers will innovate quickly. This research also discusses the history of FRGPC and its fresh and hardened properties. Lightweight Geopolymer Concrete (GPC) absorption of moisture content and thermomechanical properties formed from Fly ash (FA), Sodium Hydroxide (NaOH), and Sodium Silicate (Na2SiO3) solutions, as well as fibres, are evaluated experimentally and discussed. Additionally, extending fibre measures become advantageous by enhancing the instance’s long-term shrinking performance. Compared to non-fibrous composites, adding more fibre to the composite often strengthens its mechanical properties. The outcome of this review study demonstrates the mechanical features of FRGPC, including density, compressive strength, split tensile strength, and flexural strength, as well as its microstructural properties.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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A Review on Fresh, Hardened, and Microstructural Properties of Fibre-Reinforced Geopolymer Concrete

Baskar¹,

Annadurai²,

Sekar³

et al. 2023

Polymers

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“…Metakaolin is a viable supplementary cementitious material for concrete that is readily available. Utilisation of this material can improve the mechanical properties, durability, and efficacy of concrete structures [35][36][37][38]. Even though availability and cost can differ, proper quality control and source selection of metakaolin can guarantee consistent and reliable performance.…”

Section: Introductionmentioning

confidence: 99%

Analysis of the properties of recycled aggregates concrete with lime and metakaolin

Verma,

Chouksey,

Meena

et al. 2023

Mater. Res. Express

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In recent years, the use of alternative materials in cementitious systems has attracted considerable interest due to their potential for augmenting the durability and performance of concrete. This research is investigating the use of three such materials as partial cement replacements in concrete: Recycled Concrete Aggregate (RCA), Limestone, and Metakaolin. RCA is a byproduct of the demolition of concrete structures that can be recycled as aggregate. Incorporating RCA into concrete reduces the environmental impact of waste disposal and reduces the carbon burden. Due to its pozzolanic properties, limestone, a sedimentary rock composed primarily of calcium carbonate, can be used as a substitute for cement. By substituting a portion of cement with limestone, the cement manufacturing process can substantially reduce carbon dioxide emissions. Metakaolin, a thermally treated form of kaolin clay, is yet another alternative material with pozzolanic properties. When used as a partial cement replacement, metakaolin increases the concrete’s strength, durability, and chemical resistance. It also contributes to lowering hydration heat and mitigating alkali-silica reactions, thereby enhancing the durability of concrete structures. In this investigation, cement is replaced by limestone powder which is varied from 0% to 50% and the addition of metakaolin of 20% in every mix design. RCA is also incorporated in the mix design as a replacement for coarse aggregate by 20%. In the experimental investigation, various tests were conducted on each mix slump test, density, compressive strength, sulphate attack, mass loss, x-ray diffraction (XRD), and scanning electron microscope (SEM). After the investigation, the compressive strength improved by 15.07%, when metakaolin was added, and when LS was used to replace 10% of the cement, the compressive strength increased by 13.49%. The features of the combinations were negatively impacted when more cement was substituted. Following an investigation of hydration products, filler and dilution effects were found, both of which have the potential to be connected to improved mix quality. A mix that contains 20% metakaolin and 10% limestone powder may be considered the ideal mix owing to its superior strength and sulphate resistance when compared to normal concrete. It consists of less effect on slump value and density, the compressive strength was increased, and minimum mass loss after the sulphate attack. M3 mix best performer among all mix designs. It shows that the mix design with 20% metakaolin and 10% limestone powder is best-suitable for future recommendations.

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“…[15][16][17] Geopolymer concrete has a growing concern in many areas as an alternative construction material to ordinary concrete in the context of environmental preservation and sustainable development. 18,19 Fly ash and slag are the key raw materials used in the production of geopolymers. In recent years, there has been a lot of interest in the properties of geopolymer paste formed from blast furnace slag or fly ash.…”

Section: Introductionmentioning

confidence: 99%

Investigation on the impact of elevated temperature on sustainable geopolymer composite

Verma,

Meena,

Singh

et al. 2023

Advances in Mechanical Engineering

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Geopolymer concrete (GPC) is an eco-friendly, sustainable, cementless and green concrete. It could be an alternative to the conventional concrete. In alkaline circumstances, the alumina and silica concentration in geopolymer concrete creates the geopolymer bond, while regular concrete creates C-S-H (calcium silicate hydrate bond). The final result of the geopolymer bond does not include any water. At elevated temperatures, geopolymer concrete would thus be more stable. Due to its greater strength and durability quality, geopolymer concrete may be the ideal replacement for ordinary portland cement (OPC) concrete. This research intends to examine how specimens of geopolymer concrete and regular concrete respond to exposure to increased temperatures between 100°C and 800°C. Mass loss, ultrasonic pulse velocity, compressive strength, X-ray diffraction, thermogravimetric analysis and derivative thermogravimetric analysis were all examined throughout the experimental examination. Both concrete specimens lose mass or weight as the exposure temperature rises; OPC concrete samples spalls at 600°C, while GPC sample fail at 800°C. GPC specimens lose around 12% of their original mass after being exposed to temperatures of 800°C, while OPC specimens lose about 7%. The GPC specimens maintained 60% of their initial compressive strength after being exposed to a temperature of 700°C, but the OPC concrete specimens only kept 52%. With each increase in exposure to extreme temperatures, the peaks of quartz and cristobalite are lowered. Only the form or structure of the mineral oxide would change; the chemical linkages would remain. The GPC samples subjected to temperatures of 100°C exhibit effective thermal stability than all other specimens exposed to extreme temperatures. As the exposure temperature rises, the GPC specimens become more thermally stable. According to the experimental findings, the GPC specimens’ bonding structure makes them more resistant to high temperatures than regular concrete specimens. Micropores are present in the voids of the geopolymer matrix, while mesopores and micropores are present in the voids of the OPC matrix. While OPC bonding is C-S-H formed by the hydration of lime and silica contained in the cement, the geopolymer bonding did not include the water content in the final or end result of geopolymerisation for strengthening.

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Investigation of Mechanical and Microstructural Properties of Fiber-Reinforced Geopolymer Concrete with GGBFS and Metakaolin: Novel Raw Material for Geopolymerisation

Cited by 10 publications

References 20 publications

A Review on Fresh, Hardened, and Microstructural Properties of Fibre-Reinforced Geopolymer Concrete

A Review on Fresh, Hardened, and Microstructural Properties of Fibre-Reinforced Geopolymer Concrete

Analysis of the properties of recycled aggregates concrete with lime and metakaolin

Investigation on the impact of elevated temperature on sustainable geopolymer composite

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