Avaliação do ciclo de vida de concretos contendo agregados reciclados de diferentes origens

• Ano de defesa: 2020
• Autor(a) principal: Belisário, Elisa Silva
• 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 Civil; UFRJ
• Palavras-chave em Português: ACV; RCD; Concreto; CNPQ::ENGENHARIAS::ENGENHARIA CIVIL
• Link de acesso: http://hdl.handle.net/11422/25631

The growing generation of construction and demolition waste (CDW) creates aesthetic, environmental and public health problems. Thus, alternatives such as the reuse of CDW in the form of recycled aggregates have been studied. This work used the methodology of life cycle assessment (LCA) to evaluate the environmental performance of concretes with different fractions of recycled concrete aggregates (RCA) from different origins, taking into account the mechanical strengths and durability. The results show that the use of RCA avoids impacts related mainly to the abiotic depletion potentials, however, the global warming potential is not significantly altered. Considering that the mixture composition allowed the concretes to reach the expected mechanical strength, the structural efficiency impact indicators showed that the use of RCA is environmentally viable. However, the mortar / paste adhered to the RCA, directly influences the durability of the mixes, especially when using fine ARC in high performance concrete. Thus, the use of fine RCA with a paste adhered of up to 30% and total absorption of up to 6% is recommended only in concretes exposed to non-aggressive conditions. For coarse RCA, the results indicated that its use in fractions of 60% is more advantageous than in smaller quantities.