Cinza de forno de olaria e cinza da palha de bambu: caracterização para uso como adição mineral ativa com cimento Portland

Abstract

The exploitation of non-renewable natural resources and the disposal of residues are environmental concerns very present in all sectors of society and industry. Trying to mitigate impacts from cement production the factories has been incorporating residues in significant quantities into these cements. The use of that residues, in Brazil, are normalized by ABNT NBR 12653. The potteries are very present in the economic sector of Presidente Epitácio and the ash is the main solid residue generated. Bamboo has emerged as an excellent material to replace wood, with rapid growth and still excellent carbon sequestrator. This work aims to characterize the pottery kilns ash (PKA) and bamboo straw ash (BSA) and verify if these materials have the necessary characteristics for use as a pozzolanic material with Portland cement. The methodological process contemplates the production of the ashes that goes through the processes of firing, sieving and grinding. After this process, chemical, granulometric and mineralogical characterization tests are carried out where X-ray fluorescence, laser granulometry and x-ray diffraction tests are performed, respectively. Finally, the indirect evaluation of pozolanicity is carried out with the production of mortars. Among the mortars we have with substitutions of 10%, 20% and 30% of the mass of cement by ash. The PKA did not present the necessary characteristics in the characterization tests and led to large compressive strength deficits in the mortars produced. The BSA presents the characteristics sought in the pozzolanic materials including leading to the gain of resistance in the tests with greater quantity of substitution, at 91 days, being possible to use it as pozolánico material with Portland cement.