Modificação de pastas de cimentação com nanopartículas de C-S-H sob diferentes temperaturas

• Ano de defesa: 2019
• Autor(a) principal: Pedrosa Consición, Herman Camilo
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal do Rio de Janeiro; Brasil; Instituto Alberto Luiz Coimbra de Pós-Graduação e Pesquisa de Engenharia; Programa de Pós-Graduação em Engenharia da Nanotecnologia; UFRJ
• Palavras-chave em Português: Nanopartículas de C-S-H; Cimento Portland tipo G; Hidratação do cimento; CNPQ::ENGENHARIAS
• Link de acesso: http://hdl.handle.net/11422/14024

This work analyzes the feasibility of adding a commercial product based on C-S-H nanoparticles used in the construction industry, as nucleation points source, in cement pastes used in oil and gas wells, with the objective of improving their mechanical performance. The effects of the nanoparticles on the hydration reaction kinetics and the mechanical properties of the pastes were studied in Portland cement Class G matrices under temperature conditions that can be found in oil and gas reservoirs. Acceleration of the cement hydration reaction and modification of the mechanical properties of the pastes were identified. Nanomechanical characterization results allowed concluding that the addition of C-S-H nanoparticles promotes the generation of low-density C-S-H and decreases the production of high-density C-S-H.