Effect of porcelain tile polishing residue on geopolymer cement

Reference	Presenter	Authors (Institution)	Abstract
04-105	Fernando Pelisser	Pelisser, F.(Universidade Federal de Santa Catarina); Ramos, G.A.(Universidade Federal de Santa Catarina); Gleize, P.J.(Universidade Federal de Santa Catarina); Bernardin, A.M.(Universidade do Extremo Sul Catarinense); Poffo, C.M.(Universidade Federal de Santa Catarina);	The polishing of ceramic tiles surface produces high amounts of residual sludge, which requires deposition in controlled landfills. However, porcelain tile polishing residue (PPR) can be used as a partial source of aluminosilicate to produce geopolymer cement. Therefore, in this work, a geopolymeric cement based on PPR and metakaolin was developed using sodium hydroxide (NaOH) and sodium silicate (Na2SiO3) as activator solution. A 23+1 factorial design was used with three factors: PPR content (15, 30 and 45 mass % in relation to metakaolin); NaOH (5, 6 and 7 mass %) and Na2SiO3 (48, 50 and 52 mass %). After synthesis, the samples were characterized by mechanical (compressive strength and dynamic modulus) and structural analysis by X-ray diffraction (Rietveld method). The highest compressive strength was 72 MPa, obtained at 28 days (cured at 23°C) in the composition containing 15% of PPR and 85% metakaolin, corresponding to a chemical composition with 53% SiO2, 25% Al2O3 and 11% Na2O, and the lowest degree of crystallinity of 14%. The results showed that PPR can be used as an alternative source of raw material to produce geopolymer cement, while contributing to the reuse of an industrial waste.
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