Influence of Fly Ash Denitrification on Properties of Hybrid Alkali Activated Composites

Procházka, Lukáš; Boháčová, Jana; Vojvodíková, Barbara

doi:10.20944/preprints202201.0395.v1

Cited by 2 publications

(2 citation statements)

References 31 publications

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“…Previous research [ 45 ], using the same raw materials (GGBS and fly ash), which were activated with potassium water glass with silicate modulus of 2, showed almost no effect of demineralized water on the compressive strength. On the other hand, there was a significant effect of demineralized water on the flexural strength.…”

Section: Resultsmentioning

confidence: 95%

“…The biggest decrease was achieved by the GGBS mixture, which can be explained by the fact that this mixture had the highest amount of calcium, which was the most prone to leaching. However, if we accept the same condition as for resistance to freeze-thaw, that the drop in strength must not fall below 75% of the reference series, then all the mixtures met this condition [ 45 ].…”

Section: Resultsmentioning

confidence: 99%

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Effect of Admixtures on Durability and Physical-Mechanical Properties of Alkali-Activated Materials

2022

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The results of ground granulated blast furnace slag (GGBS) tests in alkali-activated systems show that, with its use, it is possible to produce promising materials with the required properties. Unfortunately, GGBS is becoming a scarce commodity on the market, so the effort is to partially replace its volume in these materials with other secondary materials, while maintaining the original properties. This paper focuses on a comparison of two basic types of mixtures. The first mixture was prepared only from ground granulated blast furnace slag (GGBS) and the second type of mixture was prepared with admixtures, where the admixtures formed a total of 30% (15% of the replacement was fly ash after denitrification—FA, and 15% of the replacement was cement by-pass dust—CBPD). These mixtures were prepared with varying amounts of activator and tested. The experiment monitored the development of strength over time and the influence of different types of aggressive environments on the strength characteristics. Thermal analysis and FTIR were used in the experiment to determine the degradation products. The paper provides an interesting comparison of the resistance results of different composites in aggressive environments and at the same time an evaluation of the behavior of individual mixtures in different types of aggressive environment. After 28 days of maturation, the highest strengths were obtained with mixtures with the lowest doses of activator. The difference in these compressive strengths was around 25% in favor of the mixtures with only GGBS; in the case of flexural strength, this difference was around 23%. The largest decreases in strength were achieved in the XA3 environment. This environment contains the highest concentration of sulfate ions according to the EN 206-1 standard. The decreases in compressive strength were 40–45%, compared to the same old reference series. The surface degraded due to sulfate ions. Calcium sulphate dihydrate was identified by FTIR, thermal analysis and SEM as a degradation product.

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Section: Resultsmentioning

confidence: 95%

Section: Resultsmentioning

confidence: 99%

Effect of Admixtures on Durability and Physical-Mechanical Properties of Alkali-Activated Materials

2022

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A Comprehensive Review on Fly Ash-Based Geopolymer

Luhar

2022

J. Compos. Sci.

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The discovery of an innovative category of inorganic geopolymer composites has generated extensive scientific attention and the kaleidoscopic development of their applications. The escalating concerns over global warming owing to emissions of carbon dioxide (CO2), a primary greenhouse gas, from the ordinary Portland cement industry, may hopefully be mitigated by the development of geopolymer construction composites with a lower carbon footprint. The current manuscript comprehensively reviews the rheological, strength and durability properties of geopolymer composites, along with shedding light on their recent key advancements viz., micro-structures, state-of-the-art applications such as the immobilization of toxic or radioactive wastes, digital geopolymer concrete, 3D-printed fly ash-based geopolymers, hot-pressed and foam geopolymers, etc. They have a crystal-clear role to play in offering a sustainable prospect to the construction industry, as part of the accessible toolkit of building materials—binders, cements, mortars, concretes, etc. Consequently, the present scientometric review manuscript is grist for the mill and aims to contribute as a single key note document assessing exhaustive research findings for establishing the viability of fly ash-based geopolymer composites as the most promising, durable, sustainable, affordable, user and eco-benevolent building materials for the future.

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Influence of Fly Ash Denitrification on Properties of Hybrid Alkali Activated Composites

Cited by 2 publications

References 31 publications

Effect of Admixtures on Durability and Physical-Mechanical Properties of Alkali-Activated Materials

Effect of Admixtures on Durability and Physical-Mechanical Properties of Alkali-Activated Materials

A Comprehensive Review on Fly Ash-Based Geopolymer

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