INCORPORAÇÃO DE CINZA DE CASCA DE ARROZ VERMELHO NA ELABORAÇÃO DE ARGAMASSA PARA O REPARO DE CANAIS

Abstract

Red rice in Paraíba although produced on a smaller scale than white rice produces similarly a high content of peel, often not harvested. The ash from the burning of the rice husk is a pozzolanic material that, because it is rich in silica (SiO2), has characteristics for applicability in the manufacture of mortars. The objective of this study was to evaluate the performance of red-husk ash mortars in the repair of cracks in masonry channels. The ash of the red rice hull (CCAV) comes from the red rice mill in the city of Pedra Branca - PB. The bark underwent three firing treatments with temperatures of 500 ° C - 600 ° C - 700 ° C and period of burning time of 2 - 4 - 6 hours respectively, parameters were determined as gray yield, pozolanic activity index , Thermogravimetric (TGA) and differential thermal analysis (DTA). The ashes after characterization were added in 10% partial replacement to Portland cement CPII - F32 in the manufacture of cylindrical specimens measuring 5cm in diameter and 10cm in height for evaluation resistance to simple compression, resistance to diametral compression And tensile stresses compared to test bodies without addition of CCAV. The best performance was that of the ash with burning at 600 ° C - 4h, being used in the preparation of mortar to add the cracks in the channel, where the behavior was analyzed in comparison to the mortar without addition by means of photography and measurement at 1 °, 7th and 14th days. The mortar with addition of CCAV presented superior performance of mechanical resistance, less tendency to the formation of microcracks and pores, as well as greater adhesion and finishing surface in relation to the control.