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dc.contributor.authorPires, Maikon Moreira de-
dc.contributor.authorLatteshttps://lattes.cnpq.br/6588749235099117por
dc.contributor.advisorKulakowski, Marlova Piva-
dc.contributor.advisorLatteshttp://lattes.cnpq.br/5195306459511343por
dc.contributor.referees1Rêgo, João Henrique da Silva-
dc.contributor.referees1Latteshttp://lattes.cnpq.br/6282100880834079por
dc.contributor.referees2Brehm , Feliciane Andrade-
dc.contributor.referees2Latteshttp://lattes.cnpq.br/8126174297312115por
dc.contributor.referees3Mancio , Mauricio-
dc.contributor.referees3Latteshttp://lattes.cnpq.br/4760250136044505por
dc.date.accessioned2023-09-01T14:50:54Z-
dc.date.issued2023por
dc.identifier.citationPires, Maikon Moreira de. Influência do grau de desidroxilação na reatividade de argilas cauliníticas calcinadas. Dissertação (mestrado) – Universidade do Vale do Rio dos Sinos, Programa de Pós-Graduação em Engenharia Civil, 2023.por
dc.identifier.urihttps://deposita.ibict.br/handle/deposita/418-
dc.description.resumoO elevado consumo de cimento Portland ao redor do mundo, traz consigo a responsabilidade de seus impactos ocasionados ao meio ambiente em virtude de suas elevadas emissões de dióxido de carbono (CO2), originadas no processo de fabricação do clínquer. Dessa forma, uma estratégia adotada visando a redução das emissões de CO2, é a substituição parcial do clínquer por materiais cimentícios suplementares (MCS). Entre os MCS encontram-se as argilas calcinadas, em especial as cauliníticas. As argilas, para se tornarem ativas, ou seja, para que o silício e o alumínio estejam disponíveis para reagir com hidróxido de cálcio, e carbonatos no caso de cimento LC3, necessitam ser ativadas e isso ocorre por meio de temperaturas acima de 500°C. A caulinita é um dos principais argilominerais que compõem o caulim apresentando a composição química Al2Si2O5(OH)4, tratando-se de um filossilicato dioctaédrico de estrutura 1:1. A desidroxilação consiste na remoção dessa hidroxila, desorganizando a estrutura cristalina, disponibilizando sílica e alumina para as reações pozolânicas. Essa pesquisa teve por objetivo avaliar a influência do grau de desidroxilação na reatividade argilas cauliníticas. Para tanto, empregou-se duas argilas cauliníticas denominadas como caulim branco e caulim rosa, que possuem um somatório ∑SiO2;Al2O3;Fe2O3 de 79 e 77%, respectivamente, e somatório de ∑SiO2;Al2O3 de 78% para a branca e 76% para a rosa. Foram empregadas temperaturas de calcinação de 550, 650, 750 e 850ºC e tempos de permanência de 15 e 45 minutos. Foram relacionados o grau de desidroxilação com as características físicas e químicas das argilas, bem como com o consumo de Portlandita (CH), água combinada e resistência à compressão de pastas de cimento. Após a análise dos resultados, foi possível inferir que apesar do grau de desidroxilação influenciar positivamente no consumo de CH e no teor de água combinada, o fator preponderante para o desenvolvimento da reatividade das argilas avaliadas foi a área superficial específica. Sendo os parâmetros químicos das argilas semelhantes, bem como, tamanho de partícula, ordenamento de hidroxilas e regularidade superficial, a maior reatividade da argila caulinítica rosa pode ser atribuída à sua maior área superficial específica (o dobro da A.S.E. do caulim branco).por
dc.description.abstractThe high consumption of Portland cement worldwide brings with it the responsibility for its environmental impacts due to its high carbon dioxide (CO2) emissions originating from the clinker manufacturing process. Thus, a strategy adopted to reduce CO2 emissions is the partial replacement of clinker with supplementary cementitious materials (SCMs). Among the SCMs are calcined clays, especially kaolinitic clays. In order for clays to become active, meaning that silicon and aluminum are available to react with calcium hydroxide and carbonates in the case of LC3 cement, they need to be activated, which occurs through temperatures above 500°C. Kaolinite is one of the main clay minerals that compose kaolin, with a chemical composition of Al2Si2O5(OH)4, being a 1:1 dioctahedral phyllosilicate structure. Dehydroxylation consists of the removal of this hydroxyl, disrupting the crystalline structure and making silica and alumina available for pozzolanic reactions. This research aimed to evaluate the influence of dehydroxylation degree on the reactivity of kaolinitic clays. For this purpose, two kaolinitic clays called white kaolin and pink kaolin were used, with a total sum of ∑SiO2;Al2O3;Fe2O3 of 79% and 77%, respectively, and a sum of ∑SiO2;Al2O3 of 78% for the white clay and 76% for the pink clay. Calcination temperatures of 550, 650, 750, and 850°C were used, with residence times of 15 and 45 minutes. The degree of dehydroxylation was correlated with the physical and chemical characteristics of the clays, as well as with the consumption of Portlandite (CH), combined water, and compressive strength of cement pastes. After analyzing the results, it was possible to infer that although the degree of dehydroxylation positively influenced the consumption of CH and the content of combined water, the most influential factor in the development of reactivity of the evaluated clays was the specific surface area. As the chemical parameters of the clays were similar, as well as particle size, arrangement of hydroxyls, and surface regularity, the higher reactivity of the pink kaolinitic clay can be attributed to its higher specific surface area (twice the SS of the white clay).eng
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dc.description.sponsorshipCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)por
dc.formatapplication/pdf*
dc.languageporpor
dc.publisherUniversidade do Vale do Rio dos Sinos (Unisinos)por
dc.publisher.departmentUniversidade do Vale do Rio dos Sinos (Unisinos)por
dc.publisher.countryBrasilpor
dc.publisher.programPrograma de Pós-Graduação em Engenharia Civilpor
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dc.rightsopenAccesspor
dc.subjectCimento Portland; Argilas cauliníticas calcinadas; Grau de desidroxilação; Reatividade; Área superficial específica.por
dc.subject.cnpqEngenharias Ipor
dc.titleInfluência do grau de desidroxilação na reatividade de argilas cauliníticas calcinadaspor
dc.typemastherThesispor
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