Self-compacting concrete (SCC) is a material with high workability and moderate viscosity when compared to conventional concrete. Due to its advantages, the SCC has been investigated in the last decades and the research studies the use of new components in its structure and the search for the improvement of its performance, both in the fluid and in the hardened state. The goal of this study was to evaluate the behavior of self-compacting mortars with limestone filler and with the addition of sugarcane bagasse ash (SBA) partially replacing the small aggregate. To reach this goal, initially, a rate of replacement of natural sand by SBA was set. Afterwards, slump-flow and funnel-V tests were carried out in order to check the behavior of the mortars in the fresh state. After checking the behavior of the mortars in their fresh state, the different mix proportions that achieved the best aspects of fluidity and viscosity was selected, and, for self-compacting mortars, specimens were molded to determine tensile strength at 28 days, and compressive strength at 7 and 28 days. The experimental analyses demonstrated an increase in viscosity and reduction in fluidity with increasing content of limestone filler, facilitating the obtaining of self-compacting mortars. Regarding the performance of the material in the hardened state, the mortars showed a slight increase in tensile and compressive strength due to the filler effect of fines. It was possible to replace 40% of the small aggregate with SBA.

RESUMOO presente trabalho analisa o comportamento de argamassas autoadensáveis no estado fresco para produção de concreto autoadensável ao realizar adições minerais de cinza de bagaço de cana-de-açúcar e sílica ativa. A metodologia utilizada, desenvolvida por Okamura e Ouchi (2003), consiste na análise da deformabilidade da argamassa a partir do teste de mini slump e da viscosidade pelo ensaio funil V para verificar sua capacidade autoadensável. Pelo ensaio de compacidade determinou-se uma porcentagem ótima de substituição de areia por CBC de 40%, em massa. A relação aglomerantes/agregados 1:2 conferiu argamassas autoadensáveis sem a ocorrência de exsudação e segregação dos materiais. Então, realizou-se adições de sílica ativa nos teores de 5%, 7,5% e 10% e concluiu-se que esta adição não influencia significativamente nas propriedades autoadensáveis da argamassa, causando aumento da viscosidade e redução da fluidez. Palavras-chave: reologia, sílica ativa, cinza do bagaço de cana-de-açúcar, autoadensável, resíduos agroindustriais. ANALYSE OF RHEOLOGY OF SELF-COMPACTING MORTARS WITH MINERALS ADDITIONS OF ACTIVE SILICA AND SUGARCANE BAGASSE ASH.ABSTRACT This paper analyses the comportament of self-compacting mortars when is added mineral additions of Sugarcane Bagasse Ash and Active Silica. The metodology used, developed by Okamura and Ouchi (2003), consisting of the analyse of deformability of mortar from the mini slump test and of the analyse of viscosity by funnel V test to verify its self-compacting capacitity. The optimum percentage of sand replace by Sugarcane Bagasse Ash was determinate by compactness test, and it was 40%, by mass. The relation binders/aggregates 1:2 produced selfcompacting mortars without exudation and segregation of materials. Then, Active Silica was added in contents 5%, 7,5% and 10% and it was concluded that this addition does not influence significantly to self-compacting properties of mortar, because it increases viscosity and it reduces the fluidity.