EVALUATION OF THE REOLOGY OF MIXED MORTARS CONTAINING RES-IDUE FROM THE PRODUCTION OF TITANIUM DIOXIDE (URM)

Reference	Presenter	Authors (Institution)	Abstract
04-024	José da Silva Andrade Neto	Albuquerque, D.M.(Federal University of Bahia); Andrade Neto, J.d.(Federal University of Bahia); Amorim Júnior, N.S.(Federal University of Bahia); RIBEIRO, D.V.(Federal University of Bahia);	As a consequence of the intense population growth and consumption around the world, there is a considerable increase in the amount of waste generated in the various pro-duction systems. The inadequate disposal of these wastes leads to several environmen-tal problems, such as contamination of water sources, groundwater and soil. As a re-sult, multidisciplinary efforts have been made to find suitable alternatives for the re-use of these wastes. Among the industries that present potential for the reuse of these materials, the civil construction industry stands out, through the incorporation of these wastes into cement matrixes. The unreacted ore (URM), waste generated in the pro-duction of titanium dioxide, can be found in this context, even though it still does not presents a policy of reuse and recycling in an effective way, and it is currently disposed in a controlled landfill. Thus, the present study aims to analyze the impact of the addi-tion of this residue on the rheological properties of mixed mortars (white Portland ce-ment and hydrated lime). After the physical, chemical and mineralogical characteriza-tion of the URM, Portland cement and hydrated lime, reference mortar (0% URM) was molded with a 1: 1: 5: 1.3 (cement: lime: sand: water), and with additions of 5%, 10% and 15% of URM, in relation to the mass of the cement. These mortars were evaluated for their freshness, by means of determination of Incorporated Air Content, Mass Den-sity and Water Retention, and their rheological properties, through Flow-Table, Rota-tional Rheometry and Squeeze-Flow. The study results indicate that the addition of URM results in a more rigid structure, which increases the flow stress and the viscosity of the mortar, that is, it decreases its workability.
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