Alkali activation of recycled ceramic aggregates from construction and demolition wastes

• Autor(a) principal: Gaibor, N. Y.
• Data de Publicação: 2020
• Outros Autores: Coelho, J., Leitão, Dinis, Miranda, Tiago F. S., Tavares, P., Cristelo, N.
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
• Texto Completo: http://hdl.handle.net/1822/67479
• topic: Alkali-activated cement; Ceramic; Mechanical properties; Physical properties; Waste treatment; Cerámica; Cemento activado alcalinamente; Tratamiento de residuos; Propiedades mecánicas; Propiedades físicas; Engenharia e Tecnologia::Engenharia Civil; Science & Technology

Environmental concerns are becoming increasingly more significant worldwide, thus creating the urgent need for new sustainable alternatives in the industrial sector. The present study assesses the fundamental properties of ceramic residue (CR) originated by demolition operations, specifically, the floor and wall tiles and sanitaryware furniture, for further incorporation in the construction sector, namely in alkali-activated bind- ers, mixed with other better-known precursors - fly ash (FA) and ladle furnace slag (LFS). Different CR/FA and CR/LFS weight ratios were considered and analyzed by mechanical behavior and microstructural analysis, which included uniaxial compression strength (UCS) tests, Scanning Electron Microscopy (SEM), X-ray Energy Dispersive Analyser (EDX), X-ray diffraction (XRD) and Fourier Transform Infrared Spectroscopy (FTIR). Results obtained showed that the combination of CR and FA or LFS, activated with sodium silicate, produced UCS values higher than 20 MPa and 59 MPa, respectively, after 90 days curing.