Compounds in alkaline activation in binary systems between ceramic waste and blast furnace
DOI:
https://doi.org/10.46421/entac.v20i1.6268Keywords:
Ceramic waste, Blast furnace slag, Alkaline activation, Ambient temperature curingAbstract
Ceramic waste, made up of silicon and aluminum, has the potential for use in the development of alkali-activated materials, and granulated blast furnace slag can be a source of calcium that composes binary systems. This research evaluated pastes made by alkali-activation of recycled brick powder (RBP) combined with granulated blast furnace slag (GBFS) and sodium hydroxide activating solution. The precursors were characterized, and after molding and curing the pastes at ambient temperature, compression resistance, XRD, SEM, and FTIR tests validated the occurrence of alkaline activation in the formulations proposed for ages 28 days and 91 days. The PRT50EGAF50 paste presented the highest compressive strength among the samples analyzed (58.39MPa, at 91 days). The formation of dense and cohesive matrices identified in the micrographs, the appearance of the halo between 28o and 30o in XRD, in addition to the displacement of the FTIR bands towards lower wavenumbers, can be related to the presence of amorphous gels, such as CASH, CSH and NASH, indicating effective activation of the aluminosilicates of the residues under study.
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