Nascimento, Rubens Maribondo doMedeiros, Ana Beatriz Azevedo deIngunza, Maria del Pilar DuranteGalindo, Antônio Carlos2021-12-202021-12-202020MEDEIROS, Ana Beatriz Azevedo de; INGUNZA, Maria del Pilar Durante; GALINDO, Antônio Carlos; NASCIMENTO, Rubens Maribondo do. Avaliação de resíduos de mineração de rochas cristalinas para uso como agregado em concreto segundo sua petrografia, índices físicos e resistência mecânica. Matéria (Rio de Janeiro), [S.L.], v. 25, n. 4, p. 1-1, 2020. Disponível em: https://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-70762020000400353&tlng=pt. Acesso em: 31 mar. 2021. http://dx.doi.org/10.1590/s1517-707620200004.1195.1517-7076https://repositorio.ufrn.br/handle/123456789/45484Currently, 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 capacityAttribution 3.0 Brazilhttp://creativecommons.org/licenses/by/3.0/br/Resíduos de mineraçãoAgregado em concretoPetrografiaÍndices físicosResistência mecânicaMechanical resistanceMining wasteConcrete aggregatePetrography-physical indexesarticle10.1590/S1517-707620200004.1195