Hydrothermally Treated Biomass Fly Ash as an Additive for Portland Cement

Rimvydas Kaminskas (), Anatolijus Eisinas, Irmantas Barauskas and Motiejus Gaivenis
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Rimvydas Kaminskas: Department of Silicate Technology, Faculty of Chemical Technology, Kaunas University of Technology, Radvilenu Str. 19, LT-50254 Kaunas, Lithuania
Anatolijus Eisinas: Department of Silicate Technology, Faculty of Chemical Technology, Kaunas University of Technology, Radvilenu Str. 19, LT-50254 Kaunas, Lithuania
Irmantas Barauskas: Department of Silicate Technology, Faculty of Chemical Technology, Kaunas University of Technology, Radvilenu Str. 19, LT-50254 Kaunas, Lithuania
Motiejus Gaivenis: Department of Silicate Technology, Faculty of Chemical Technology, Kaunas University of Technology, Radvilenu Str. 19, LT-50254 Kaunas, Lithuania

Sustainability, 2024, vol. 16, issue 7, 1-15

Abstract: This study aimed to investigate the possibility of using biomass fly ash as a cement additive after hydrothermal modification. The treatment of biomass fly ash involves additional milling and curing under various hydrothermal conditions. Variation of the CaO/SiO 2 ratio was achieved by mixing different samples of biomass fly ash. Samples with a CaO/SiO 2 ratio of 1 and 1.5 were selected for synthesis, and cement samples with different amounts of the synthesized additive were examined. The research employed the following methodologies: XRD, XRF, DSC-TG, ICP-OES, and isothermal calorimetry. It was found that in all the biomass fly ash samples, calcium silicate hydrates already formed after 2 h of hydrothermal synthesis at 200 °C. Analysis of the chemical composition of the liquid medium after hydrothermal maintenance revealed an exceptionally low release of heavy metals from the samples. The synthesised additive accelerated the initial hydration of Portland cement. In total, 5% to 10% of the weight of cement can be replaced by hydrothermally treated biomass fly ash without reducing the compressive strength class of Portland cement samples.

Keywords: biomass fly ash; calcium silicate hydrates; Portland cement; synthesis; hydration (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2024
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