Name: RAFAEL VANCINI SCHIMITH BERGHE
Publication date: 29/01/2024
Examining board:
Name |
Role |
|---|---|
| GIOVANNA PATRÍCIA GAVA | Examinador Externo |
| RAFAEL DORS SAKATA | Examinador Externo |
| RONALDO PILAR | Coorientador |
| RUDIELE APARECIDA SCHANKOSKI | Presidente |
Summary: Among the viable strategies for reducing CO2 emissions by the cement industry is a reduction in the amount of clinker in cement, through the partial replacement of supplementary cementitious materials (SCMs). However, the potential decline in supplies of the most widely used SCMs has been driven by interest in research into other materials. In this context, we present ferronickel slag (FNS), obtained in the production of ferronickel alloys in a rotary electric furnace, which currently has no commercial value, being stored in yards or discarded in landfills. Therefore, the present work sought to analyze the prediction of the addition of FNS in the production of composite Portland cements, following the prescriptions of ABNT NBR 16697 (2018) “Portland Cement – equirements”. The cements were produced at 10%, 20% and 30% mass replacement of clinker by FNS, and were compared to the requirements of the Brazilian standard and to a cement with the addition of 20% limestone filler (FC-20). The materials used in the
manufacture of cements were molded and characterized using SEM, x-ray fluorescence, Blaine, laser granulometry, specific mass. Furthermore, we converted the R3 assay to evaluate the reactivity of FNS and limestone. The gypsum content in the cements was defined using the isothermal conduction calorimetry test. The cement tests were carried out in accordance with the prescriptions of ABNT NBR 16697 (2018). According to the results, FNS proved to be viable as a mineral addition, presenting all standard requirements for composite cements (CP II) in the three replacement levels. The cements FNS-10 and FNS-20 were classified as class 40 and the cement FNS-30 as class 30. In the specification resistance tests, a gain in resistance was combined with 91 days
of the cements composed with FNS, indicating a greater hydraulic activity in advanced ages. The incorporation of 20% of FNS was considered the optimal content for incorporation into the cement in this research.
Keywords: Ferronickel slag; NBR 16697; portland cement requirements; addition; additional cementitious materials.
