Estudo Comparativo do Concreto Auto Adensável com Cinza da Casca de Arroz sem Controle de Queima e Sílica Ativa

Abstract

The addition of rice husk ash (CCA) contributes to the sustainability of construction. Since it is applied in self-compacting concrete (CAA), it reduces production costs for concrete, reduces negative environmental impacts and improves some of its physical and mechanical properties. In this research, the technical feasibility was analyzed using two traces: a reference with addition of active silica of 10% and another one with additions of 5%, 10% and 20% of CCA without control of burning, for each Water / binder ratio were 0.47, 0.55 and 0.65 by the IPT / EPUSP method according to TUTIKIAN. Then, its properties of axial compression strength, tensile strength in diametrical compression, modulus of deformation and absorption of water by immersion were analyzed. For this study, materials from the Palmas region were used: Portland V-ARI cement, active silica, gravel 0, medium sand, superplasticizer additive, and ash from the rice husk without burning control. The results demonstrated that it is feasible to add CCA in the cement according to the studied contents, in a way that contributed to its resistance, to the reduction of cement consumption and the preservation of natural resources.