Navegando por Autor "Silva, Gabriel Moreira Santos"

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    Avaliação da viabilidade técnica de uma cinza do bagaço da cana-de-açúcar, beneficiada por moagem, para produção de concretos
    (2023-04-17) Silva, Gabriel Moreira Santos; Galvão, Simone Perruci; http://lattes.cnpq.br/1523292800241605; http://lattes.cnpq.br/1025369292967009
    Brazil, the largest sugar and ethanol producer in the world, has a large supply of sugarcane bagasse ash (SCBA) as waste from the agro-industry. Intending to reduce the environmental impact caused by this industry and contribute to the valorization of SCBA, this study investigated the technical feasibility of using SCBA in addition to Portland cement for the production of precast concrete elements. The ash collected from the industry was processed by dry grinding in a ball mill, optimizing the processing time for a fineness range of 1600 m²/kg. The processing time was improved for the first seven hours, reaching a Blaine fineness of 1400 m²/kg, renaming the sample to CB-1400, and proceeding with further characterization tests of the material regarding the pozzolanic properties of the ashes and the properties of concrete, such as slump, compressive strength, and water absorption. For comparison, concrete without ash (REF), with ash “in natura” without grinding (CB-SM) and with favored ash (CB-1400) were produced and two types of curing (wet curing and air curing) were performed. The results indicated that only the CB-1400 has possible pozzolanic potential and filler effect. In the evaluation of the concrete, in the fresh state, only the mixture with CB-1400 maintained the slump of reference. As for the properties of concrete in the hardened state, it was observed that the air curing process, practiced in the industry, did not significantly influence the strengths at 7 days and 28 days; as for the wet curing condition, the concrete CB-1400 showed higher compressive strength than the reference mix. As for water absorption capacity, all concretes were within the tolerance designated by NBR 8451-1 (2020). The SCBA benefited from the grinding followed by monitoring the fineness of the particles proved to be a viable alternative for concrete production and can contribute to reducing the environmental impacts of this agro-industry while generating economic value for the material.