Estudo da Produção e Aplicação em Pastas Cimentícias de Sílica Gel Proveniente das Cinzas da Casca do Arroz.

Abstract

The experimental program of this research was developed in order to evaluate the silica gel performance in cement based pastes. Thus, parameters of silica gel from rice husk ash were studied extraction. The incorporation of silica gel was made by the partial replacement of 0%, 2,5% e 5% of the cement mass in 0,45 water-cementitious material (w/cm) paste, and 0%, 5%, 7% in 0,5 w/cm paste. The silica gel behavior was evaluated based on X- ray diffraction, thermal analysis and compressive strength after 3, 7 and 28 days of curing. The results showed that is possible the production of pastes with excellent mechanical performance from the silica gel application as pozzolan. In particular, the compressive strength of the silica gel paste was about 46% higher than the reference paste. Moreover, there was a decrease of the more than 50% of calcium hydroxide content in the silica gel paste, indicating the pozzolanic activity of the silica gel produced in this work.