Reactivity and self-hardening of fly ash from the fluidized bed combustion of wood and peat

[Display omitted] •Hydration of fly ash from fluidized bed combustion of biomass and peat is studied.•Self-hardening strength is dependent on soluble Al, Si, Ca and S.•Ettringite is the most important identified reaction product.•Sulfur is a limiting component for ettringite formation. An investigat...

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Bibliographic Details
Published in:Fuel (Guildford) 2014-11, Vol.135, p.69-75
Main Authors: Illikainen, Mirja, Tanskanen, Pekka, Kinnunen, Päivö, Körkkö, Mika, Peltosaari, Olli, Wigren, Valter, Österbacka, Jan, Talling, Bob, Niinimäki, Jouko
Format: Article
Language:English
Subjects:
Applied sciences
Biomass
Biomass fly ash
Energy
Energy. Thermal use of fuels
Ettringite
Exact sciences and technology
Fluidized bed combustion
Fuels
Hydration
Natural energy
Self-hardening
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Summary:[Display omitted] •Hydration of fly ash from fluidized bed combustion of biomass and peat is studied.•Self-hardening strength is dependent on soluble Al, Si, Ca and S.•Ettringite is the most important identified reaction product.•Sulfur is a limiting component for ettringite formation. An investigation into the self-hardening of fly ash from the fluidized bed combustion of wood, peat and forest industry residuals shows the self-hardening strength of eight different ash samples after 28days of curing at room temperature followed by 7days at 50°C to be dependent on its reactive calcium, aluminium and sulphate content. The main reaction products were ettringite and hydrocaluminate. Sulphate was found to be the most typical limiting component for ettringite formation.
ISSN:0016-2361
1873-7153
DOI:10.1016/j.fuel.2014.06.029