Investigation of hydration products of fly ash–slag pastes

Kledyński, Z.; Machowska, Agnieszka; Pacewska, Barbara; Wilińska, Iwona

doi:10.1007/s10973-017-6233-4

Cited by 32 publications

(24 citation statements)

References 28 publications

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“…In the case of PF, the presence of crystalline aluminosilicate phase, probably type of muscovite, is registered. X-ray diffraction patterns confirm general differences in composition of fly ashes coming from conventional and fluidized combustion, and the results agree with literature data, e.g., [42,51,52,54,55].…”

Section: Fly Ashessupporting

confidence: 88%

“…Recently, we studied mixtures composed of fluidized fly ash and blast furnace slag as nonclinker binder in which fly ash was considered as activator for slag. Results of investigation of hydration products arising in such systems were presented in [51]. The results are promising and encourage further research of, e.g., activated systems containing a very high amount of fluidized fly ash and a small amount of cement.…”

Section: Introductionmentioning

confidence: 85%

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Comparative investigation of reactivity of different kinds of fly ash in alkaline media

Wilińska

Pacewska

2019

J Therm Anal Calorim

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Comparison of the influence of temperature and different alkali activators on the reactivity of two types of fly ash (conventional, fluidized) was presented. The main emphasis was put on fluidized fly ash as potential component of binding mixtures containing low amount of cement. Conventional fly ash was used as a reference. It was found that for these materials the key differences affecting products of activation are: availability of calcium and sulfate ions as well as structure of fly ash grains influencing dissolution of aluminate and silicate species. Fluidized fly ash, contrary to conventional fly ash, undergoes reaction in 0.1 M solutions of hydroxides forming mainly ettringite. In the case of 4 M hydroxides, both fly ashes undergo hydration processes. Conventional fly ash formed mainly amorphous aluminosilicate gel, while fluidized fly ash may create zeolitic products especially in the case of elevated temperature of early hydration. Sulfate and alkali ions can be incorporated into aluminosilicate structure of new formed products; however, this process depends strictly on the type of used hydroxide and its concentration. The presence of Ca(OH) 2 , carbonates and alkali sulfates was also registered in the case of hydrated fluidized fly ash.

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Section: Fly Ashessupporting

confidence: 88%

Section: Introductionmentioning

confidence: 85%

Comparative investigation of reactivity of different kinds of fly ash in alkaline media

Wilińska

Pacewska

2019

J Therm Anal Calorim

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“…Overall, SCA met the requirements for structural concrete [117]. Kledynski et al [118] identified the hydration products present in hardened SCA pastes. Their results revealed the progression of the hydration process over time and the formation of products similar to those present in hardened cement pastes.…”

Section: Mixtures Of Industrial Waste Materialsmentioning

confidence: 95%

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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“…Depending on the type of aluminosilicate source material as well as conditions of reaction (such as concentration of alkali and temperature), this product may be zeolitic or amorphous [4-6, 8, 9]. There are also research reports concerning utilisation of fly ash from fluidised combustion of coal as activator for slag component in nonclinker mixture [28,29].…”

Section: Introductionmentioning

confidence: 99%

Influence of selected activating methods on hydration processes of mixtures containing high and very high amount of fly ash

Wilińska

Pacewska

2018

J Therm Anal Calorim

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Binders containing fly ash as cement substitute have been used for many years. Typical amount of fly ash in cement composite does not exceed 35% of mass of binder. Replacement of substantial amount of cement mass by fly ash results in retardation of hydration of binder and deterioration of some concrete properties, e.g. delay in setting time and reduction in early compressive strength. These inconveniences may be reduced using proper method of activation. In this paper, possibilities to activate binding mixtures containing high and very high amount of fly ash and low amount of Portland cement were discussed basing on the literature reports as well as on our own research results. Several activating methods were described, such as mechanical activation, exchanging of part of components of binder (cement, fly ash or both of them) by more reactive fine-grained material, chemical activation by the use of alkaline activators as well as combined methods. Possibilities of using these methods were discussed in relation to amount of fly ash introduced as replacement of cement and kind of fly ash used. Usefulness of calorimetry and thermal analysis methods was also presented.

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Investigation of hydration products of fly ash–slag pastes

Cited by 32 publications

References 28 publications

Comparative investigation of reactivity of different kinds of fly ash in alkaline media

Comparative investigation of reactivity of different kinds of fly ash in alkaline media

Utilization of Fly Ashes from Fluidized Bed Combustion: A Review

Influence of selected activating methods on hydration processes of mixtures containing high and very high amount of fly ash

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