Valorização de resíduos de uma indústria de pré-moldados de compósitos geopoliméricos como adição pozolânica

Abstract

The objective of this study is to characterize the industrial solid waste generated by a geopolymeric composites precast industry in Goiás and use them in the production of mortar, in partial replacement of cement in the contents of 5%, 10%, 15% and 25%, due to its probable pozzolanic effect. For the research, the residue underwent crushing in a hammer mill and sieving in a #40 mesh, carried out in the industry itself. It was then taken to the laboratory of the Federal Institute of Goiás - Campus Goiânia, where physical-chemical analyzes were carried out to verify if the residue meets the parameters established by ABNT NBR 12653: 2014 Pozzolanic Materials – Requirements. The residue showed potential to be used as pozzolana, as in the particle size analysis only 19% was retained on sieve #325 and the moisture content also met the parameters of the aforementioned standard. However, the fire loss content and the alkali content available in were higher than the standard requirements, due to the fact that the residue contains tire shavings and sodium hydroxide (NaOH) in its composition. In relation to the performance index with Portland cement at 28 days, the mortar with 5% residue in its composition met the standard conditions. The performance with lime did not obtain the desired result, as when adding more water to the mortar to obtain the consistency index, the resistance decreased. After analysis, it was realized that the residue does not qualify as pozzolan but can be used as a filler.