Year: 2026
Type: article
Abstract: This study evaluates the performance of cement mortar utilizing 100% carbonated electric arc furnace (EAF) steel slag substitute for sand. Raw slag underwent aqueous carbonation, achieving a 2% CO2 uptake by transfer CaO into CaCO3, verified via XRD and TGA. Three formulations, a reference, untreated slag (100SS), and carbonated slag (100SS-C), were assessed for mechanical and volumetric properties. While 100SS reduced baseline strengths compared to the control, carbonation mitigated these deficits. Specifically, the 100SS-C mixture demonstrated a 4.27% increase in flexural strength and enhanced compressive performance relative to 100SS. Furthermore, precipitated CaCO3 densified the microstructural matrix and obstructed capillary pores, significantly reducing drying shrinkage. These findings confirm viability of carbonated EAF slag in mortar, presenting approach to waste valorization, resource conservation, and carbon sequestration.
Authors: Tien-Dung Nguyen, Ngoc-Phuong Pham, Thanh-Cuong Nguyen, Dinh-Bach Ngo, Tan-Dat Nguyen
Institution: University of Da Nang
Subfield: Mechanical Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: diamond
Funder: Đại học Đà Nẵng
OpenAlex ID: W7202168573
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