Alkali activation of recycled ceramic aggregates from construction and demolition wastes

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 f...

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Published inMateriales de construcción (Madrid) Vol. 70; no. 339; pp. 222 - e222
Main Authors Gaibor, N., Coelho, J., Leitão, D., Miranda, T., Tavares, P., Cristelo, N.
Format Journal Article
LanguageEnglish
Published Madrid Consejo Superior de Investigaciones Científicas 01.09.2020
Subjects
Aggregates
alkali-activated cement
By products
ceramic
Ceramics industry
Compression tests
Compressive strength
Construction industry
Demolition
Dispersion
Energy consumption
Fly ash
Fourier transforms
Infrared analysis
Infrared spectroscopy
Mechanical properties
Microstructural analysis
Natural resources
Particle size
physical properties
Recycling
Sanitary ware
Scanning electron microscopy
Slag
Sodium silicates
Sustainability
Waste disposal
waste treatment
X-ray diffraction
Portugal
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Summary: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 binders, 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.
ISSN:0465-2746
1988-3226
DOI:10.3989/mc.2020.13619