Avaliação de argilas industriais formuladas com resíduo de vidro na produção de agregado sintético

Abstract

The present work has the objective to characterize technologically five clays used in ceramics sectors in Brazil. Its potential to produce synthetic aggregate of calcined clay to replace brittle in concrete production was evaluated. The clays were characterized by granulometry, plasticity index, X - ray diffraction, differential thermal and gravimetric analysis, dilatometric analysis, X - ray fluorescence, organic matter content, cation exchange capacity, specific area. Test specimens were produced by uniaxial pressing at 30 MPa in a rectangular (60x20x12 mm3) and cylindrical (20 in height and 20 mm in diameter) and fired at 1100oC. It was observed that 1-PIN, 2-IN and 4 -MA were the ones that presented better results of water absorption, compressive strength and apparent specific mass due to the range of flux oxides presented (4.5 to 5.9%), fire loss between (3.8 and 8.8 %) and low organic matter content (<3.4%). The specimens of the ceramic formulations without and with incorporation of 5,10 and 20% of packaging glass waste were fired and subsequently characterized. It was observed that, after fired at 1100oC, all the formulations presented parameters of mechanical resistance to compression, water absorption and specific mass comparable to those of the gravel, with the exception of the mass containing 20% of waste that presented the same results when fired at 1000oC, contributing to reduce the fired temperature and reduce the environmental impact.