ATIVIDADE POZOLÂNICA DAS CINZAS DE BAGAÇO DE CANA DE AÇÚCAR SUBMETIDAS À DIFERENTES TRATAMENTOS

Abstract

Most agro-industrial residues generated by industrial processes are not disposed of correctly in the environment, causing soil pollution. That said, the use of agro-industrial waste by partially replacing cement with sugarcane bagasse ash (SBA), in mortars and concrete, is beneficial as long as these residues are pozzolanic. For this purpose, this work aimed to analyze the pozzolanic activity of CBCA, submitted to different treatments, namely: ashes in natura, ashes calcined at 400 ° C and at 600 ° C for 3 hours, empirical latex ash and crushed ash. To assess the pozzolanicity of the residues, methods of physical and chemical analysis were used, namely: determination of performance with Portland cement at 28 days and determination of fixed calcium hydroxide - Chapelle method, respectively. The approach of these methods aimed to identify which one is more efficient, in terms of viability and reliability of the results. The results were different between the methods of analysis of pozzolanic activity, with empirically re-burnt ashes having a higher index of pozzolanic activity, 65.62%, in the cement method at 28 days, while in natura ash obtained better results in Chapelle method. However, no CBCA treatment reached the minimum requirement of NBR 5752 (ABNT, 2014) of 90% pozzolanic activity and 330 mgCaO / g, as the particle size and carbon content in the CBCAs directly interfere with pozonality.