Agradecimentos: The authors would like to acknowledge CAPES - Coordination for the Improvement of Higher Education Personnel, Brazil for providing a Master's Scholarship for one of the authors (Carvalho, E. V.); the Laboratory of Materials (School of Technology, University of Campinas), for...

Agradecimentos: The authors would like to acknowledge CAPES - Coordination for the Improvement of Higher Education Personnel, Brazil for providing a Master's Scholarship for one of the authors (Carvalho, E. V.); the Laboratory of Materials (School of Technology, University of Campinas), for providing all the materials and equipment used in the research; Professor Lisandro Pavie Cardoso and Msc Guilherme A. Calligaris from the Laboratory of Materials Preparation and Characterization (Institute of Physics Gleb Wataghin - IFGW, University of Campinas) for the DRX analysis; Melanie Eldridge for English reviewing and Errol Zeiger for scientific English editing

Abstract: Ceramic companies worldwide produce large amounts of polishing tile waste, which are piled up in the open air or disposed of in landfills. These wastes have such characteristics that make them potential substitutes for cement and sand in the manufacturing of concrete products. This paper...

Abstract: Ceramic companies worldwide produce large amounts of polishing tile waste, which are piled up in the open air or disposed of in landfills. These wastes have such characteristics that make them potential substitutes for cement and sand in the manufacturing of concrete products. This paper investigates the use of ceramic tile polishing waste as a partial substitute for cement and sand in the manufacturer of concrete paving blocks. A concrete mix design was defined and then the sand was replaced with wastes from three production lines (porcelain tile, porous tile and stoneware tile) of a Brazilian ceramic tile industry in the percentages of 5%, 10%, 15%, 20%, 25% and 30%. Another group of concrete was produced with porcelain tile waste replacing the cement. The concretes were characterized using a slump test. Paving blocks were produced and subjected to compression strength, water absorption and porosity tests. Compression strength values were compared to Brazilian Standards for paving blocks. A reduction in slump was observed for all concretes as the percentage of waste addition increased, in relation to the control concrete. The compression strength values were higher for concrete cured for 28 days, and all blocks met the standard requirement of 35 MPa for light vehicle traffic at a curing age of 7 days. The strength values obtained when the porcelain tile waste replaced sand were higher than when this waste replaced cement, and those values were even higher than the control concrete, and met the standard requirement of 50 MPa for heavy vehicle traffic. Water absorption values tended to decrease as sand was replaced by ceramic tile wastes, due to the filler effect. These results show that it is possible to replace 30% of fine aggregate or 20% of cement with ceramic tile wastes and produce paving blocks suitable for use in heavy vehicle traffic. Thus, this research demonstrates that the use of ceramic tile waste as a component of concrete for paving blocks manufacturing is technically feasible

COORDENAÇÃO DE APERFEIÇOAMENTO DE PESSOAL DE NÍVEL SUPERIOR - CAPES

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