resumo
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Substitution of 17 wt.% of Ordinary Portland Cement by biomass fly ash in the formulation of a commercial screed mortar. Substitute Ordinary Portland Cement (OPC) by biomass fly ash (BFA) reduce the environmental impact produced by cement-based materials, and at the same time, decreased the economic and environmental burden associated with the landfilling of this waste. This study aims to evaluate the recycling of BFA as supplementary cementitious materials (SCMs) in a commercial screed mortar formulation. Two BFA varieties, both resulting from fluidized bed combustion of forest residues, were used to replace 17, 50, and 67 wt.% of OPC. The influence of simple pre-treatment processes of the BFA, such as sieving and grinding, in the fresh and hardened state properties of the mortars, was evaluated. The BFAs were characterized in terms of chemical (XRF) and mineralogical (XRD) composition, particle size distribution (laser diffraction-COULTER) and morphology (SEM). The prepared formulations were characterized in terms of workability, mass loss upon curing, bulk density, sorptivity (by immersion and capillary), flexural and compressive strength and durability to 25 freeze-thaw cycles. Both of the BFAs are potential SCMs. Substitution of 17 wt.% OPC with BFA complied with the product technical requirements for compressive and flexural strength (10 and 3 MPa, respectively), with the ground and sieved and just sieved BFAs perform slightly better than the as-received BFA.palavras-chave
BOTTOM ASH; COMBUSTION
categoria
Chemistry, Multidisciplinary; Engineering, Multidisciplinary; Materials Science, Multidisciplinary; Physics, Applied
autores
Capela, MN; Tobaldi, DM; Tarelho, LAC; Seabra, MP; Labrincha, JA
nossos autores
David Maria Tobaldi
Investigador
João António Labrincha Baptista
Professor Catedrático
Maria Paula Seabra
Professor Auxiliar
Marinélia Capela
InvestigadorProjectos
InPaCTus - Innovative Products and Technologies from Eucalyptus Project (InPacTus)
agradecimentos
This work was supported by Portugal 2020 through the European Regional Development Fund (in the frame of Operational Competitiveness and Internationalization Program) in the scope of the project INPACTUS, POCI/01/0247/FEDER/21874 and in the scope of the project CICECO, UIDB/50011/2020 and UIDP/50011/2020 cofinanced by national funds through the FCT/MEC. Thanks are due to FCT/MCTES for the financial support to CESAM (UIDP/50017/2020 and UIDB/50017/2020) through national funds.