Fly Ash from Co-Burning Bituminous Coal and Biomass--Effect on Properties of Cement

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Title: Fly Ash from Co-Burning Bituminous Coal and Biomass--Effect on Properties of Cement

Author(s): J. Matolepszy and E. Tkaczewska

Publication: Special Publication

Volume: 242

Issue:

Appears on pages(s): 165-174

Keywords: biomass; cement; compressive strength; fly ash; heat of hydration; microstructure; porosity

Date: 4/1/2007

Abstract:
This paper presents possibilities of use of fly ashes from co-burning bituminous coal and other fuels in cement production process. Both fly ashes coming from co-burning bituminous coal and biomass and the ones from coal combustion were analysed. The physical and chemical properties of the fly ashes were examined by determination of fineness, chemical and phase composition, pozzolanic activity and structure of the glassy phase. Cement samples with different content of the fly ashes were prepared. The following properties of the samples were tested: porosity, compressive strength as well as heat of hydration. The results show that cement samples containing fly ashes from co-burning bituminous coal and biomass had demonstrated adverse features like higher porosity, lower compressive strength after specified ages, than the ones containing fly ashes from bituminous coal combustion. The investigations of microstructure of the cements were also carried out by SEM.