Avaliação do desempenho de cimentos Portland com incorporação de escória de ferroníquel moída como material cimentício suplementar para estabilização de solos
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Data
2025-09-19
Autores
Dutra, Felipe Oliveira
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Universidade Federal do Espírito Santo
Resumo
With the growing demand for sustainable pavement engineering solutions, ferronickel slag (FNS) has emerged as a promising substitute for conventional Portland cement clinker. Although FNS exhibits pozzolanic potential, its use in powder form for natural soil stabilization remains underexplored. In this study, laboratory-formulated cements (CFN cements) were produced by partially replacing clinker with milled and sieved FNS powder in varying proportions (e.g., CFN30 = 30% FNS replacement relative to clinker). These binders were evaluated through unconfined compressive strength (UCS), resilient modulus (RM), physicochemical dosage (PC), and Atterberg limit (AL) tests. Two soil types were investigated: red soil (RS; A-6 plastic clay) and purple soil (PS; A-4 silty soil), both stabilized with CFN formulations at a fixed dosage of 7% by dry soil mass. The results revealed a clear inverse linear relationship between clinker replacement level and mechanical performance, as reflected in UCS and RM values. Despite this trend, Tukey’s test (95% confidence) showed that CFN10 and CFN30 were statistically equivalent to Type I cement (ASTM C150), while CFN50 and CFN70 matched the performance of Type IS cement (ASTM C595), except for CFN70 in RS mixtures at 63 days. For RM, all binders performed similarly in RS mixtures, whereas in PS compositions, statistical differences emerged only at 63 days, with CFN30 and CFN50 equivalent to Type I cement and CFN70 to Type IS cement. RS mixtures consistently exhibited superior strength and stiffness compared to PS mixtures, highlighting the influence of soil mineralogy and granulometry. PC dosage confirmed the greater efficiency of RS, requiring only 8% cement for stabilization versus 10% for PS with the same CFN binder. AL results further indicated stronger pozzolanic reactivity in RS-based mixtures. These findings demonstrate the technical viability of FNS powder as a supplementary cementitious material (SCM) for soil stabilization and support its integration into sustainable pavement technologies. This approach aligns with global efforts to reduce clinker consumption, promote circular economy practices, and minimize environmental impacts.
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Misturas solo-cimento , Aglomerantes pozolânicos , Materiais cimentícios suplementares