Fly ash as a raw material for geopolymerisation-mineralogical composition and morphology

Korniejenko, Kinga; Łach, Michał; Marczyk, Joanna; Ziejewska, Celina; Halyag, NP; Mucsi, Gábor

doi:10.1088/1757-899x/706/1/012006

Cited by 17 publications

(27 citation statements)

References 28 publications

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“…The physical parameters of the fly ash also supported geopolymerization, including the content of particles under the size of 45 μm is ca. 88% [27,28]. This supports the reactivity of the raw material.…”

Section: Methodssupporting

confidence: 72%

The impact of the curing process on the efflorescence and mechanical properties of basalt fibre reinforced fly ash-based geopolymer composites

et al. 2020

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Efflorescence is one of the limitations of the widespread use of geopolymers. This problem is caused by excess unreacted sodium oxide remaining inside materials. Unreacted sodium oxide creates white efflorescence on the surface of the produced material in the form of sodium carbonate heptahydrate Na2CO3∙ 7H2O. It decreases not only the aesthetic value of the final products, but also the mechanical properties of the material. The aim of this article is to analyse the influence of the curing method on the appearance of efflorescence on geopolymer composites reinforced by short basalt, especially on mechanical properties. Class F fly ash from the ‘Skawina’ coal-fired power plant (located in Skawina, Lesser Poland, Poland) was used as raw material for the geopolymerization process. The article compares two methods of curing: typical laboratory conditions (in the air) and samples submerged in water. Three series of fly ash-based geopolymer were cast: basalt fibres were added as 1% and 2% by weight of fly ash and one control series without any fibres. The investigation was performed using visual analysis, including microstructure investigation, and the testing of mechanical properties (compressive strength at ambient temperature) after 28 days.

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Section: Methodssupporting

confidence: 72%

The impact of the curing process on the efflorescence and mechanical properties of basalt fibre reinforced fly ash-based geopolymer composites

et al. 2020

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“…It has good physical parameters -the content of particle under the size 45 μm is ca. 88% [25,26]. The fly ash contains a lot of spherical particles and has good workability [26].…”

Section: Methodsmentioning

confidence: 99%

“…88% [25,26]. The fly ash contains a lot of spherical particles and has good workability [26]. The mineralogical structure investigations show the large amount of DOI 10.18502/keg.v5i4.6800…”

Section: Methodsmentioning

confidence: 99%

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Mechanical Properties of Basalt Fiber Reinforced Fly Ash-Based Geopolymer Composites

Korniejenko

Mucsi

Halyag

et al. 2020

KEG

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This article analyses the influence of a short basalt fibre admixture on the mechanical properties of geopolymers, especially compressive strength. This preliminary research is the first step towards the development of a composite for fire resistant applications in civil engineering. This study investigates the behaviour of a fly ash based geopolymer containing basalt fibres. Fly ash from the coal power plant ‘Skawina’ (located in: Skawina, Lesser Poland, Poland) was used as the raw material. The chemical composition of this fly ash is typical for class F. Three series of fly ash based geopolymers were cast. In the first, short basalt fibres were added as 1% by weight of fly ash, in the second short basalt fibres were added as 2% by weight of fly ash and the third functioned as a control series without any fibres. Each series of samples were tested on compressive strength after 28, 14 and 7 days, and specimen density was determined. Additionally, microstructural analysis was carried out after 28 days. The results show that the addition of basalt fibres can improve the mechanical properties of geopolymer composites. Keywords: geopolymer, basalt fibre, composites, fire resistance

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“…The solid geopolymers based on the fly ash from the CHP plant in the city called Skawina (Lesser Poland region, Poland) and sand in ratio 1:1. This fly ash has the physical and chemical properties that support the geopolymerization process [42][43][44]. The second geopolymers according to the metakaolin and sand in ratio 1:1.…”

Section: Methodsmentioning

confidence: 99%

Impact of Flax Fiber Reinforcement on Mechanical Properties of Solid and Foamed Geopolymer Concrete

Korniejenko

Łach

Hebdowska-Krupa

et al. 2020

Adv. technol. innov.

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The main objective of this study is to develop the advanced composites for civil engineering applications as material for the building industry, especially for an insulation purpose. The research processes include several steps. Firstly, the prototype elements, such as bricks and elevation elements were performed from eco-friendly composite -flax fiber reinforced geopolymer. The elements were designed to take into consideration for environment. Geopolymers are environmentally friendly, sustainable, and resource efficient, including energy demand. Next, the wall was built from these elements and exposed during the three months in a relevant environment. The main conclusion of the research is that the kind of fibers is important for the mechanical properties of the composite, including the fact that for those different fibers could be more beneficial for different raw materials, giving higher strength properties. The significant influence on the mechanical properties of the composites has the adhesion between fiber and material used as a matrix. The adhesion depends among others on the previous treatment of the fibers.

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Fly ash as a raw material for geopolymerisation-mineralogical composition and morphology

Cited by 17 publications

References 28 publications

The impact of the curing process on the efflorescence and mechanical properties of basalt fibre reinforced fly ash-based geopolymer composites

The impact of the curing process on the efflorescence and mechanical properties of basalt fibre reinforced fly ash-based geopolymer composites

Mechanical Properties of Basalt Fiber Reinforced Fly Ash-Based Geopolymer Composites

Impact of Flax Fiber Reinforcement on Mechanical Properties of Solid and Foamed Geopolymer Concrete

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