Carbonation of concretes containing LC³ cements with different supplementary materials

Carlos Eduardo Tino Balestra; Gustavo Savaris; Alberto Yoshihiro Nakano; Ricardo Schneider

doi:10.5433/1679-0375.2022v43n2p161

Carbonatação de concretos contendo cimento LC³ com diferentes materiais suplementares

Autores

Carlos Eduardo Tino Balestra Universidade Tecnológica Federal do Paraná - UTFPr https://orcid.org/0000-0001-7624-7921
Gustavo Savaris Universidade Tecnológica Federal do Paraná - UTFPr https://orcid.org/0000-0002-3311-2426
Alberto Yoshihiro Nakano Universidade Federal do Paraná - UFPr https://orcid.org/0000-0002-3757-1427
Ricardo Schneider Universidade Tecnológica Federal do Paraná - UTFPr https://orcid.org/0000-0001-9501-8489

DOI:

https://doi.org/10.5433/1679-0375.2022v43n2p161

Palavras-chave:

concreto, LC³-50, metacaolim, materiais cimentícios suplementares, clínquer

Resumo

Devido ao processo de clinquerização durante a produção do cimento Portland, grandes quantidades de CO2 são emitidas, aumentando os efeitos relacionados às mudanças climáticas (aproximadamente 5-10% das emissões globais de CO₂ são provenientes da produção de cimento), consequentemente, a busca por alternativas para mitigar esses altas emissões são necessárias. O uso de materiais cimentícios suplementares (SCM) para substituição parcial do clínquer/cimento Portand tem sido objeto de diversas pesquisas, incluindo o uso de cimentos LC³ (Limestone Calcined Clay Cements), onde até 50% do clínquer Portland pode
ser substituído, entretanto, a indústria cimenteira já utilizou outros materiais cimentícios complementares com atividades pozolânicas em cimentos comerciais. Nesse sentido, este trabalho avalia o desempenho de concretos contendo misturas LC³ com a presença de diferentes SCM (sílica ativa, cinza volante, cinza de bagaço de cana e cinza de caroço de açaí) quanto a questões de durabilidade por carbonatação. Os resultados mostraram que todos os concretos com LC³ apresentaram frentes de carbonatação maiores em relação ao concreto de referência, com cimento Portland, devido à menor disponibilidade de cálcio para reagir com o CO₂ que penetra nos poros do concreto, por isso a adoção de procedimentos de cura e revestimentos são recomendados.

Biografia do Autor

Carlos Eduardo Tino Balestra, Universidade Tecnológica Federal do Paraná - UTFPr

Prof. Dr., Depto. Engenharia Civil, UTFPR, Toledo, PR

Gustavo Savaris, Universidade Tecnológica Federal do Paraná - UTFPr

Prof. Dr., Depto. Engenharia Civil, UTFPR, Toledo, PR

Alberto Yoshihiro Nakano, Universidade Federal do Paraná - UFPr

Prof. Dr., Depto. de Engenharia Eletrônica, UTFPR, Toledo, PR

Ricardo Schneider, Universidade Tecnológica Federal do Paraná - UTFPr

Prof. Dr., Depto. de Processos Químicos e Biotecnológicos, UTFPR, Toledo, PR

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