Pozzolanic effect of porcelain polishing residue in Portland cement
2015
Jacoby, Pablo Cardoso | Pelisser, Fernando
Ceramic tiling is used on a large scale by the construction industry. The production process of tiles produces porcelain polishing residues (PPR), one of the main residues in the sludge, with loss rates above 1%. Since it is a residue that is impure for reuse in the process, it ends up being discarded in landfills. However, considering its characteristics, its fineness and chemical composition, its potential as a pozzolanic material was evaluated for use in the manufacture of cement-based construction materials in order to improve their yield. Tests were conducted on mortar and cement pastes using substitutions of 5%, 10% and 20% cement by PPR. The results of compressive strength (at 84 days) determined for the mortars showed an increase of 18%, with reduced cement consumption per MPa/m3 for mortar of 11.5 kg MPa−1 m−3 at 0% and 7.5 kg MPa−1 m−3 at 20% residue content. Thermogravimetric analysis revealed that the portlandite formed by cement was consumed by the silica present in the residue, forming calcium silicate hydrate (C–S–H), which characterizes a pozzolanic reaction. This effect contributed to the study and to the applications of supplementary cementitious materials, while optimizing the use of Portland cement and reducing the environmental impact of carbon dioxide emissions originating from its production.
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