Influence of calcining temperature on the activation of sugar-cane bagasse:: kinetic parameters

The present paper describes a study of the influence of calcining temperature (800 and 1000 degrees C) on the activation of sugar-cane bagasse. The reaction kinetics in a bagasse ash-lime system were investigated by means of X-ray diffraction patterns and thermogravimetric curves. The kinetic parameters were calculated by applying a kinetic-diffusive model. The results obtained in this study show, on one hand, that the bagasse ash calcined at 800 and 1000 degrees C has a similar pozzolanic activity after 28-90 days of reaction. There were, however important differences with regard to its activation rate. On the other hand, no crystalline compounds from a pozzolanic reaction were detected. The values of the kinetic parameters confirmed the different activation of bagasse ash as a function of the calcining temperature applied.