resumo
Ordinary Portland Cement is the most widely used binder in the construction sector; however, a very high carbon footprint is associated with its production process. Consequently, more sustainable alternative construction materials are being investigated, namely, one-part alkali activated materials (AAMs). In this work, waste-based one-part AAMs binders were developed using only a blast furnace slag, as the solid precursor, and sodium metasilicate, as the solid activator. For the first time, mortars in which the commercial sand was replaced by two exhausted sands from biomass boilers (CA and CT) were developed. Firstly, the characterization of the slag and sands (aggregates) was performed. After, the AAMs fresh and hardened state properties were evaluated, being the characterization complemented by FTIR and microstructural analysis. The binder and the mortars prepared with commercial sand presented high compressive strength values after 28 days of curing-56 MPa and 79 MPa, respectively. The mortars developed with exhausted sands exhibit outstanding compressive strength values, 86 and 70 MPa for CT and CA, respectively, and the other material's properties were not affected. Consequently, this work proved that high compressive strength waste-based one-part AAMs mortars can be produced and that it is feasible to use another waste as aggregate in the mortar's formulations: the exhausted sands from biomass boilers.
palavras-chave
FLY-ASH; PORTLAND-CEMENT; COMPRESSIVE STRENGTH; GEOPOLYMER MORTARS; REACTION-KINETICS; SLAG; ABSORPTION
categoria
Chemistry, Physical; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering; Physics, Applied; Physics, Condensed Matter
autores
Goncalves, M; Vilarinho, IS; Capela, M; Caetano, A; Novais, RM; Labrincha, JA; Seabra, MP
nossos autores
Ana Caetano
Estudante de doutoramento
Inês Lousada Silveirinha Borges Vilarinho
Investigador Júnior
João António Labrincha Baptista
Professor Catedrático
Margarida Gonçalves
Bolseiro de investigação
Maria Paula Seabra
Professor Auxiliar
Marinélia Capela
Investigador
Rui Miguel Novais
Professor AuxiliarProjectos
InPaCTus - Innovative Products and Technologies from Eucalyptus Project (InPacTus)
agradecimentos
This work is financed by Portugal 2020 through the European Regional Development Fund (ERDF) in the frame of the Operational Competitiveness and Internationalization Programme (POCI) in the scope of the project INPACTUS, POCI-01-0247-FEDER-21874 and in the scope of the project CICECO-Aveiro Institute of Materials, UIDB/50011/2020 & UIDP/50011/2020, cofinanced by national funds through the FCT/MEC. The authors would like to thank the project THERMACORE-Performance of a wall or slab with a thermally active core in buildings in Portugal, POCI-01-0145-FEDER-030364, through the financial support of FCT-Fundacao para a Ciencia e Tecnologia/MCTES. Novais wishes to thank FCT for supporting his work (Ref. CEECIND/00335/2017 and 2020.01135.CEECIND).