20.500.12556/DiRROS-28021 Utilization potential of steel slag for CO2 sequestration and as a filler aggregate in mortars Steel slag is an abundant by-product of steelmaking and a promising candidate for CO2 sequestration due to its favorable chemical composition and mineralogy. In this study, the CO2 sequestration capacity of the processed steel slag Ekominit was analyzed. Ekominit is a mineral product obtained by processing a mixture of electric arc furnace (EAF) stainless steel slag and ladle slag, currently used only for simple engineering constructions. The study demonstrated a promising sequestration capacity of 127.4 g CO2 per kg of Ekominit, measured using direct semi-dry carbonation under ambient pressure at 40 ± 0.5 °C, 80 ± 3.2% relative humidity, and 20 ± 0.1 vol% CO2 for 5 days, which is within the typical range reported for carbonated steel slags (100–150 gCO2/ kgslag). Although Ekominit did not show sufficient potential as a supplementary cementitious material in mortar, the results confirmed that its incorporation as a filler—with or without carbonation treatment—enhances both the flowability and compressive strength of the mortar. This research emphasizes the dual-function potential of Ekominit: it captures CO2, contributing to the decarbonization of the steel sector, and enables its reuse in construction materials, even improving the performance of mortars when using such carbonated Ekominit as fillers. Through such industrial symbiosis, environmental impact is further reduced by substituting virgin raw materials with secondary products. slag carbonation sequestration aggregates žlindra karbonatizacija sekvestracija agregat true false true Springer Nature Angleški jezik Slovenski jezik © The Author(s) 2026 Neznano 2026-03-06 10:26:57 2026-03-06 10:34:03 2026-03-07 03:51:42 0000-00-00 00:00:00 2026 0 0 str. 1-14 issue 1 Vol. 12 Feb. 2026 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 2026-02-27 54 2199-3831 10.1007/s40831-026-01463-6 270428675 https://doi.org/10.1007/s40831-026-01463-6 0 a14c36cd-193e-11f1-81cd-001a4af901a5 https://dirros.openscience.si/Dokument.php?lang=slv&id=41339 RAZ_Loncnar_Mojca_2026.pdf RAZ_Loncnar_Mojca_2026.pdf 1 0B0C78FD8A788FF0296C5C7FB345BD71 9534a8c0b1a82cef8679ca1cae80191e8bec4fe9403675c4e20f3c5da7efc2c4 5d5249e1-193f-11f1-81cd-001a4af901a5 https://dirros.openscience.si/Dokument.php?lang=slv&id=41343 Zavod za gradbeništvo Slovenije 0 0 0