Hydraulic clinkerless binder on the fluid sulfocalcic fly ash basis

Škvára, František; Šulc, Rostislav; Snop, Roman; Peterová, Adéla; Šídlová, Martina

doi:10.1016/j.cemconcomp.2018.06.020

Cited by 16 publications

(14 citation statements)

References 18 publications

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“…Kang and Choi [115] determined that the optimal range of free-CaO content of FBCFA was 9-17%. Škvára et al [116] found the use of polycarboxylate based plasticizer necessary for this ternary mix (FBCFA, conventional fly ash and Ca(OH) 2 ) in order to achieve similar properties to OPC.…”

Section: Mixtures Of Industrial Waste Materialsmentioning

confidence: 99%

Utilization of Fly Ashes from Fluidized Bed Combustion: A Review

et al. 2020

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Traditionally fly ash is thought to be glassy, spherical particle originating from pulverized coal combustion (PCC) at temperature up to 1700 °C. However, nowadays fluidized bed combustion (FBC) technology is spreading quickly around the world as it is an efficient and environmentally friendly method. FBC is also able to utilize mixtures of low-grade solid fuels (e.g., coal, lignite, biomass, and waste) that have fluctuating quality, composition, and moisture contents. However, this leads to a high variation in the produced fly ash quality, unlike PCC fly ash, and hence challenges when attempting to utilize this fly ash. In this study, the utilization of fluidized bed combustion fly ash (FBCFA) was reviewed using the Scopus database. The most promising utilization target for FBCFA from biomass combustion is as a fertilizer and soil amendment. In construction, the FBCFA from various fuels is utilized as cement replacement material, in non-cement binders, as lightweight aggregates and cast-concrete products. Other types of construction applications include mine backfilling material, soil stabilizer, and road construction material. There are also other promising applications for FBCFA utilization, such as catalysts support material and utilization in waste stabilization.

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Section: Mixtures Of Industrial Waste Materialsmentioning

confidence: 99%

Utilization of Fly Ashes from Fluidized Bed Combustion: A Review

et al. 2020

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“…The use of FBC-ash is significantly more complicated compared to that of FA. However, it turns out that even this type of CCP may find a significant application in construction works [ 15 , 16 ].…”

Section: Introductionmentioning

confidence: 99%

A Study of Physicochemical Properties of Stockpile and Ponded Coal Ash

et al. 2022

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The article describes chemical and also selected physical properties of ponded high temperature fly ash (FA) and bottom ash (BA) from a Mělník lignite power plant located in the Czech Republic. The research was carried out on samples obtained from drills with a depth of up to 54 m and the age of the samples retrieved from the lowest layers of the stockpile dating back to 1960. At the same time, a comparison was made with fresh fly ash and fresh bottom ash obtained from the identical power plant. The study analyzed a total of 98 stockpile samples. The properties selected were studied across the entire stockpile, namely moisture content, specific density, specific surface, carbon content, elemental and phase composition, pH, electrical conductivity and leachability. SEM analyses were also performed. The performed measurements of chemical properties proved the chemical stability of the material even after several decades of storage in the stockpile. The largest changes are evident in the results of the analyses related to the leachability of SO3, Cl− and F−. In contrast, the pH does not change significantly, and the composition is pH neutral or alkaline. Regarding ponded BA, particle disintegration was noted depending on the increasing core borehole depth.

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“…% by weight of the FBC ash. The water to binder ratio in the range of 20 -65 % FBC ash is used to prepare the mixtures [22][23]. This work builds on our previous research [21,23] in which the SCB pastes or mortars were subjected to an F-T test in water or 3 % NaCl.…”

Section: Introductionmentioning

confidence: 99%

Degradation of a Sulfocalcic Binder in a Mixture With Cement Due to Freezing and Thawing

Pulcova¹

2022

Ceramics - Silikaty

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The paper deals with the freeze-thaw (F-T) resistance of pastes prepared from a mixture of Portland cement (CEM) and a new clinker-free calcium sulfate binder (SCB) based on sulfocalcic fly ash (FBC ash). Pastes with varying ratios of these two binders were prepared and their F-T corrosion resistance in water and a 3 % NaCl solution was investigated. Furthermore, the paste aeration effect on the F-T resistance and the change in the phase composition of the paste during F-T cycling was studied. The results showed that the F-T resistance of the CEM-SCB mixtures was higher compared to the pastes prepared from the unmixed binders alone. All the mixed CEM-SCB pastes showed an undisturbed or slightly disturbed surface in both the water and 3 % NaCl environments, i.e., excellent F-T corrosion resistance after 100 and 200 F-T cycles in an environmental test chamber. A change in the ettringite content over time was observed.

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Hydraulic clinkerless binder on the fluid sulfocalcic fly ash basis

Cited by 16 publications

References 18 publications

Utilization of Fly Ashes from Fluidized Bed Combustion: A Review

Utilization of Fly Ashes from Fluidized Bed Combustion: A Review

A Study of Physicochemical Properties of Stockpile and Ponded Coal Ash

Degradation of a Sulfocalcic Binder in a Mixture With Cement Due to Freezing and Thawing

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