Análise das propriedades mecânicas do concreto com adição de cinza de casca de arroz em comparação com metacaulim e sílica ativa

Abstract

Currently many segments of the economy aim to turn their activities more and more sustainable. A strand extensive researched is the use of materials that are considered to be a waste in other industrial activities. Once concrete is a material widely use at Brazilian construction industry, the use of industrial waste on its composition might bring great environmental benefits. The Brazilian agribusiness has grown a lot lately, the growth on the rice production stood out. A sub product of rice is the husk, which when burned produces an ash, which has already been used commercially, as an concrete’s addition. Despite all of this, it is unknown the performance of rice husk ash (RHA) when compared, on the same study, with others mineral additions commonly used on the Brazilian market , such as Sílica Fume (SF) and Metacaulim (M). Therefore, this study aims to compare the effect of adding rice husk ash (RHA) on the concrete comparing the results with the use of sílica fume and metaculim. The study analyzed the substitution of 8% cement volume by RHA, SF and M on 30 MPa Fck concrete.The material analyzed were characterize physically and chemically. The parameters analyzed were elastic modulus, specific mass, compressive strength, porosity and the relation cost-compressive strength. Results show similar performances for evaluated samples, however the SF and RHA are more economically competitives.