Name: LYLIAN GRAMLICH NOVELLI
Publication date: 31/01/2024
Examining board:
Name |
Role |
|---|---|
| ALEXANDRE LIMA DE OLIVEIRA | Examinador Externo |
| CÉZAR AUGUSTO CASAGRANDE | Coorientador |
| RAFAEL DORS SAKATA | Examinador Externo |
| RONALDO PILAR | Presidente |
Summary: The manufacture of ferronickel alloys results in the significant production of by-products, such as granulated ferronickel slag (EFN), generated in the pyrometallurgy process to produce the ferronickel alloy. In order to propose a destination for this by-product, the use of EFN as a supplementary cementitious material in high-performance concrete was studied. For this study, concretes containing 10%, 20% and 30% replacement, by mass, of Portland cement with EFN were dosed, for a w/c ratio of 0.35. The following tests were carried out: consistency, fresh specific mass, chemical reactivity (R³). absorption by immersion and capillarity, penetration of chloride ions, compression resistance and calorimetry. Based on the results, it is observed that up to 10% of cement replacement with EFN does not affect mechanical resistance at 91 days. With other replacement levels, they showed a drop in compressive strength, but required lower consumption of Portland cement per MPa. The presence of EFN led to increases in the induction period, between 14 and 22% higher than the reference mixture. Electrical conductivity decreased by up to 26.82% for concrete containing 30% EFN, when compared to references. Finally, it can also be observed that EFN presents chemical reactivity according to the accelerated test prescribed by ASTM C1897:2020, reaching a total released value of 144 J/g.
