Dissertação Mestrado Profissional em Tecnologias Ambientais

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https://repositorio.ifal.edu.br/handle/123456789/582

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Navegando Dissertação Mestrado Profissional em Tecnologias Ambientais por Orientador "Souza, Ronny Francisco Marques de"

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    Análise da viabilidade técnica da incorporação de conchas de mexilhão-dourado na produção de blocos vazados de concreto para alvenaria
    (INSTITUTO FEDERAL DE ALAGOAS - Ifal, 2025-09-29) Silva, Fabrícia Moreira da; Marques, Sheyla Karolina Justino; https://orcid.org/0000-0001-7554-2275; http://lattes.cnpq.br/3917387578549073; Souza, Ronny Francisco Marques de; https://orcid.org/0000-0002-8943-0247; http://lattes.cnpq.br/7651317326903869; Silva, Alline Gomes Lamenha e; http://lattes.cnpq.br/6999138868720208; Silva, Larissa Bezerra da; https://orcid.org/0000-0002-1617-5425; http://lattes.cnpq.br/7496665681376824
    Limnoperna fortunei (golden mussel) is an invasive species whose rapid proliferation in freshwater systems has generated environmental and economic impacts, resulting in large volumes of biomass without an adequate destination. In this context, the present study evaluated the technical feasibility of incorporating golden mussel shells as a partial replacement for fine aggregate in the production of hollow concrete masonry blocks. The experimental procedure consisted of four stages: shell collection, physicochemical characterization (granulometry, Xray diffraction, X-ray fluorescence, and thermogravimetric analysis), production of concrete specimens, and technological testing. Concrete mixtures were prepared with 0%, 10%, 20%, 30%, 40%, and 50% replacement of natural sand by crushed shells, and cylindrical specimens were molded in accordance with NBR 5738. The specimens were subjected to water absorption, compressive strength, and scanning electron microscopy tests. The results showed that replacement levels of up to 30% maintain mechanical performance compatible with the requirements for structural and non-structural concrete blocks, while the 50% replacement level is suitable only for non-structural (partition) blocks. The findings confirm that golden mussel shells can be used as a subproduct in cementitious matrices, providing a sustainable alternative for waste recovery and contributing to the reduction of natural resource consumption in the construction sector.
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    Análise do desempenho de argamassa de assentamento com substituição parcial do agregado miúdo por embalagens cartonadas trituradas
    (Instituto Federal de Educação Ciência e Tecnologia de Alagoas, 2022-10-20) Carvalho, Juliana Lira Brito de; Marques, Sheyla Karolina Justino; http://lattes.cnpq.br/3917387578549073; Souza, Ronny Francisco Marques de; http://lattes.cnpq.br/7651317326903869; Rapôso, Áurea Luiza Quixabeira Rosa e Silva; http://lattes.cnpq.br/7600867517446003; Gondim, Priscylla Cinthya Alves; http://lattes.cnpq.br/7727315802596668
    Due to its composition, post-consumer carton packs have great potential to be used as an input in the manufacture of new products. In this context, this research aimed to analyze the performance of partial replacement of fine aggregate by triturated carton packages in the development of a masonry mortar. The methodology was divided into the following steps: elaboration of a systematic literature review; collection, preparation and comminution of carton packages; characterization of raw materials; definition of the reference and experimental compositions; performance of technological tests; and analysis of results. In the fine aggregate, granulometric analysis was performed. The by-product, Triturated Cartons Packages (ECT), was characterized by Chemical Analysis by X-Ray Fluorescence (XRF) and Scanning Electron Microscopy (SEM). The proportion of 1:6 of volume of cement and fine aggregate was adopted as reference and experimental compositions were determined with substitutions of 5%, 10% and 15% of volume of aggregate by ECT, being molded and tested 5 specimens for each composition. The tests of Consistency Index, Compressive Strength, Water Absorption by Immersion and SEM of Fracture Surface were performed. It was carried out the correlation analysis between the average values of the properties and the percentage of ECT replacement. As for the results of the Consistency Index test, the mortars with ECT replacement showed a small reduction, but they remained in the range presented in the literature. Regarding Compressive Strength, the mortars with replacement of 5%, 10% and 15% showed average values of 7.57 MPa, 6.52 MPa and 6.07 MPa, respectively. Mortars with ECT showed a low rate of Water Absorption by Immersion, when compared to literature data. The statistical analysis revealed that all properties studied have strong correlation with the percentage of ECT replacement. The SEM of the Fractured Surface found the highest number of voids and the presence of microcracks in the samples with the highest percentages of ECT. Finally, the accomplishment of this study proved to be relevant in the context of the development of new technical materials, presenting to the market the mortar with triturated post-consumer carton packages.