Mortar Effect of Rice Husk Ash Burning on Fluidized Flow and Sliding Grid

Abstract

The rice in the south of Brazil is one of the main economy activities, which produce a large volume of waste coming from the beneficiation industries. The main goal of this research is evaluate the feasibility of use of rice husk ash, burning on fluidized flow (FF) and sliding grid (SG) for mortars. The characterization methods of rice husk ash (RHA) included loss on ignition, particle size distribution by laser, x-ray diffraction, x-ray fluorescence spectrometer, pozzolanic activity index and specific mass. Mortar specimens were molded with the proportion of 1:3 in mass and water/binder ratio of 0.51. The Portland cement was replaced by RHA with the proportion of 10%, 15% and 20%. Compressive strength, water absorption, air voids content, hydration-releasing heat curves, mercury intrusion porosimetry and scanning electron microscope were performed for all mortars. The mechanical performance of mortar with RHA replacement, shows to be satisfactory and feasible alternative for the final waste disposal.