Reference Presenter Authors
04-031 José da Silva Andrade Neto Andrade Neto, J.d.(Federal University of Bahia); Mariani, B.B.(Universidade Federal da Bahia); Amorim Júnior, N.S.(Federal University of Bahia); RIBEIRO, D.V.(Federal University of Bahia); The production of cement, the building material most consumed worldwide, generate a high environmental impact by consuming a high amount of raw material and energy, besides a high CO2 emission. One of the widely adopted practices by the industry to decrease the environmental impact is the co-processing. This practice is a proper environmental alternative for industrial wastes disposal and, depending on the chemical composition of the waste used on the raw meal, it has the potential of reduce the amount of energy and CO2 emissions during the Portland clinker’s production. In this context, the present paper aims to evaluate the hydration process of alternative cements that were produced from clinker co-processed with unreacted ore (URO), waste from TiO2 production. It was studied four different cements produced from clinkers with different raw meals composition, with the lime saturation factor (LSF) set at 98%, varying the content of incorporated TiO2 in 0% (reference), 0.5%, 1.0% and 2.0%. The raw meals were calcined at 1340°C and the resulting clinkers were mixed and ground with gypsum, resulting in the cements. The produced cements and a CP V ARI RS, commercially available in the metropolitan region of Salvador, were, characterized physically, chemically and mineralogically. The hydration process of these cements was evaluated by calorimetry, X-ray diffractometry (XRD) and scanning electron microscopy (SEM). It was observed that the incorporation up to 1.0% of TiO2 favored the hydration reactions, accelerating the process and resulting, thus, in a higher formation of the hydrated phases.
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