article
Avaliação de resíduos de mineração de rochas cristalinas para uso como agregado em concreto segundo sua petrografia, índices físicos e resistência mecânica
Fecha
2020Registro en:
1517-7076
10.1590/S1517-707620200004.1195
Autor
Nascimento, Rubens Maribondo do
Medeiros, Ana Beatriz Azevedo de
Ingunza, Maria del Pilar Durante
Galindo, Antônio Carlos
Resumen
Currently, mining waste has been take an important role as a raw material in environmental sustainability
programs, with the objective of minimizing the impacts resulting from mining activity. Given this, this research proposes to analyze pegmatite mining waste for use in aggregate for concrete. The samples were petrographically characterized according to their reactive potential to the Alkali-Aggregate Reaction under
standard ABNT 15577-3 and tests were performed to evaluating the physical indexes and mechanical
strength. It was found among the dimensions of pegmatites that two of them shows innocuous for alkaliaggregate reaction, because it contains levels of deleterious phases for RAA below the limit acceptable by the norm. Though, the other samples showed potential reactivity to RAA, because either contains deformed
quartz, or both deleterious phases identified according to the standard used: deformed quartz and microgranular. The mechanical resistance assumed values below the average values presented by the consulted literature. This fact is justified by the degree of alteration observed in the studied samples. Mining residues were found to have been subjected to weathering, resulting in a drop in expected mechanical strength values. Considering the physical indexes, the samples showed good results regarding the moisture absorption capacity