Desempenho mecânico e análise da corrosão das armaduras em concretos produzidos com adição de resíduos de rochas ornamentais

Abstract

This research evaluates the reinforcement steel corrosion process induced by chloride ions in concrete containing ornamental rock waste (ORW) as mineral addition. Physical, chemical, mineralogical analysis and particle size distribution of ORW were performed. Concrete mixtures were produced with three levels of water/ cement ratio -0.45; 0.55 and 0.65 -and four levels of ORW addition -0, 5, 10 and 15% -by weight of the binder. Consistency of fresh concrete and compressive strength of hardened concrete were evaluated; water absorption and capillary absorption of concrete were performed as durability features. The concrete specimens were exposed to wet and dry cycles and corrosion potential monitoring test. Finally, the colorimet-ric method (AgNO3 of 0,1 mol/L) was performed. Results show that the 5% ORW content ratio is beneficial to concrete at mechanical and durability perspectives against chloride ion attack.