Particle size effect on pozzolanic activity of rice husk ash (RHA) with high content of amorphous silica

Abstract:

The rice husk ash (RHA) is a pozzolanic mineral admixture to cement that has been increasingly studied in recent years. It has high amorphous silica content and is classified as highly reactive pozzolan with properties similar to silica fume, when it is produced with controlled burning process and finely ground. This study evaluated the effect of fineness on pozzolanic activity of the RHAs with high content of amorphous silica. For this, it was carried on a study of the calcination temperature effect in amorphous silica content of RHAs, and then the RHA samples were produced with high amorphous silica content with different milling times. A laser particle size distribution, X-ray, specific surface, diffraction, modified Chapelle, performance index with Portland cement to seven days, were performed. According to the presented results, it is observed with decreasing the particle size and consequently increasing of specific surface Blaine of RHAs with high content of amorphous silica influences less on its calcium hydroxide consumption but it has a more important effect in the increasing of mortars’ compression strength.


Reference:
PINHEIRO, Divino Gabriel Lima; RÊGO, João Henrique da Silva; QUARCIONI, Valdecir Angelo; LIMA, Sérgio Soares; BERGMANN, Carlos Pérez. Efeito da granulometria na atividade pozolânica da Cinza de Casca de Arroz (CCA) com alto teor de sílica amorfa. In: CONGRESSO BRASILEIRO DE CIMENTO, 7., 2016, São Paulo. Anais… CD. 08 p.

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