Assessment of mechanical and microstructural properties of geopolymers produced from metakaolin, silica fume, and red mud

Mendes, Beatryz Cardoso; Andrade, Igor Klaus Rocha; Carvalho, José Maria de; Pedroti, Leonardo Gonçalves; Júnior, André de Oliveira

doi:10.1111/ijac.13635

Cited by 22 publications

(9 citation statements)

References 64 publications

(124 reference statements)

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“…GPC with an NS content of 6%. A few high peaks were found GPC when Nanomaterial was added, revealing the presence of SiO 2 , Ca 3 SiO 3 , and CaCO 3 phases [ 91 ].…”

Section: Influences Of Nanomaterials On Fresh and Hardened Properties...mentioning

confidence: 99%

Review on the Relationship between Nano Modifications of Geopolymer Concrete and Their Structural Characteristics

et al. 2022

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The main objective of this review is to study some important nanomaterials and their impact on the performance of geopolymer concrete. This paper is an investigation into trends and technology in the development of different nanomaterials to develop higher structural performance geopolymer concrete. The effect of the alkaline to binder and sodium silicate to sodium hydroxide ratio on the performances of geopolymer performances is studied. The relationship between setting time and slump is evaluated through the ternary plot, the variation in compressive strength values is evaluated using the kernel density plot, and the relationship between split tensile and flexural strength is investigated using the scattering interval plot. Regression analysis is carried out among water absorption and bulk-density result values obtained from previous literature. As the molarity and alkaline to binder (A/B) ratios increase, the strength development of geopolymer concrete increases up to a specific limit. The addition of a small quantity of nanomaterials, namely, nano silica, nano alumina, carbon nano tubes, and nano clay, led to the maximum strength development of geopolymer concrete. Incorporating these nanomaterials into the geopolymer significantly refines the structural stability, improving its durability. The various products in GP composites emerging from the incorporation of highly reactive SEM, XRD, and FTIR analysis of nanomaterials reveal that the presence of nanomaterials, which enhances the rate of polymerization, leads to better performance of the geopolymer.

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“…GPC with an NS content of 6%. A few high peaks were found GPC when Nanomaterial was added, revealing the presence of SiO 2 , Ca 3 SiO 3 , and CaCO 3 phases [ 91 ].…”

Section: Influences Of Nanomaterials On Fresh and Hardened Properties...mentioning

confidence: 99%

Review on the Relationship between Nano Modifications of Geopolymer Concrete and Their Structural Characteristics

et al. 2022

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“…[88] It was used as a single precursor [21,42,63,81,85,87,[89][90][91][93][94][95]100]. In the case of binary [21,[43][44][45]57,73,88,92,[95][96][97][98][99]101,102] and ternary [101,102] precursors, it was used together with a variety of conventional and/or alternative sources [21,[43][44][45]57,73,88,92,[95][96][97][98][99]101]. Mixed precursors containing different ratios of RH, RHA, MK, POFA, and GGBFS were also investigated [79].…”

Section: It Was Used As a Precursormentioning

confidence: 99%

“…It was used as an ingredient of AA for GGBFS [28,29] and FA-based AABs [119]. Additionally, it was utilised in binary and ternary precursors with a variety of conventional and/or alternative feedstocks [28,58,72,80,98,99,120,[122][123][124]. Moreover, a one-part geopolymer was investigated by calcinating RM with SH pellets [121,124].…”

Section: It Was Used As An Aa With Shmentioning

confidence: 99%

The Obstacles to a Broader Application of Alkali-Activated Binders as a Sustainable Alternative—A Review

et al. 2023

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This paper aims to raise awareness regarding the obstacles limiting alkali-activated binders’ (AABs) application as a sustainable solution in the construction industry. Such an evaluation is essential in this industry, which has been introducing a wide range of alternatives to cement binders yet achieved limited utilisation. It has been recognised that technical, environmental, and economic performance should be investigated for the broader adoption of alternative construction materials. Based on this approach, a state-of-the-art review was conducted to identify the key factors to consider when developing AABs. It was identified that AABs’ adverse performance compared to conventional cement-based materials mainly depends on the choice of which precursors and alkali activators to employ and the regionalised practices adopted (i.e., transportation, energy sources, and data on raw materials). In light of the available literature, increasing attention to incorporating alternative alkali activators and precursors by utilising agricultural and industrial by-products and/or waste seems to be a viable option for optimising the balance between AABs’ technical, environmental, and economic performance. With regard to improving the circularity practices in this sector, employing construction and demolition waste as raw materials has been acknowledged as a feasible strategy.

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“…6 Iron ore tailings (IOT) have been widely studied in recent years as a blend material for conventional ordinary Portland cement (OPC)-based composites and alkaliactivated-based composites as fine aggregate, filler, raw material for clinker production, and as a precursor for alkali-activated materials. [7][8][9][10][11][12] Research has been done about the use of mine tailings to develop alkali-activated materials for application as construction and building materials [13][14][15] ; however, there is a scarce number of studies using the IOT in alkali-activated composites, as well as using the IOT as the main precursor to the alkali-activation.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and properties of alkali‐activated iron ore tailings blended with metakaolin

Silva

Barbosa

Ferreira

et al. 2023

Int J Applied Ceramic Tech

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In this study, synthesis, microstructural characteristics, mechanical properties, and environmental compatibility of alkali‐activated binders derived from iron ore tailings (IOT)—with partial replacement with metakaolin (MK)—were investigated. The binders were produced with a NaOH solution, IOT, and MK. A thermal cure at 100°C was used and the MK was applied as a partial replacement of IOT in three proportions (10, 20, and 30 wt%). The IOT‐based specimens presented an average of 98.0 and 18.0 MPa at 7 days age of curing for compressive and flexural strength, respectively. The mechanical properties of the alkali‐activated binders with MK decreased as the substitution ratio increased. By the microstructural analysis, it was found a zeolite‐type phase in alkali‐activated IOT, while in the binders blended with MK, three new mineral phases were identified. Furthermore, Fourier transform infrared, quantitative X‐ray diffraction, and environmental analysis suggest that the Fe species present in IOT acted in the alkali‐activation reaction.

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Assessment of mechanical and microstructural properties of geopolymers produced from metakaolin, silica fume, and red mud

Cited by 22 publications

References 64 publications

Review on the Relationship between Nano Modifications of Geopolymer Concrete and Their Structural Characteristics

Review on the Relationship between Nano Modifications of Geopolymer Concrete and Their Structural Characteristics

The Obstacles to a Broader Application of Alkali-Activated Binders as a Sustainable Alternative—A Review

Synthesis and properties of alkali‐activated iron ore tailings blended with metakaolin

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