Ref.: MCoMcc37-002
Apresentador: Luana Maria Vilaça da Silveira
Autores (Instituição): Silveira, L.M.(Universidade de São Paulo); Romano, R.C.(Universidade de São Paulo); Pileggi, R.G.(Universidade de São Paulo);
Resumo:
The growing generation of bauxite residue from Bayer process (BR) has pushed research efforts focused on its recycling, particularly in the context of cementitious compositions for sustainable construction. This study investigates the rheological properties of cementitious pastes incorporating BRs from two distinct regions in Brazil. The pastes were designed with varying proportions of BR and cement, and their rheological behavior was evaluated using rotational rheometry and mini-slump tests. The addition of BR from one region resulted in increased yield stress and viscosity, reducing paste flow, while BR from another region improved flow without significant changes in rheological parameters. This last outcome was unexpected and was attributed to the intricate interplay of chemical, mineralogical, and surface properties of the BR, influencing particle mobility and interactions within the pastes. This study emphasizes how the analysis must be done separately, considering all the factors that characterizes the materials involved, as they have physicochemical characteristics that alter the properties of the final product.