Estudo da influência da cinza de casca de arroz nos tempos de pega do cimento.

Abstract

The rice husk ash (CCA) is an agro-industrial waste which can be applied to replace cement partially, by agricultural buildings, reducing costs and environmental problems. Its applicability due to the high content of Silica present in its chemical constitution. The aim of this work is to determine and compare the influence in initial and ending setting times of wasting CCA replacement on cement, in different percents and, consequently, in the required amount of water in the normal consistence paste. Further, the compressive strength is also evaluated. The applied CCA is wasting, originally from Pelotas – RS and it was processed in ball windmills for two hours. The adopted replacement percents were: 0% (reference), 6%, 10%, 15%, 33% and 50%. The tests have been done according to ABNT current rules. According to these tests, the amount demanded grows bigger with the replacement content and the same occurs in relation to the setting times. About the compressive strength, the cement with 15% replacement has registered the higher