Work

Evaluation of steel slags in CO2 sequestration and as supplementary cementitious material

Year: 2025

Type: article

Abstract: This work presents the results of enforced carbonation experiments realised on steel slags, sourced from various European plants and proposes carbonation as a viable valorization method. All samples demonstrated rapid carbonation reactions and effectively sequestered substantial amounts of CO 2 . Calcite and silica gel were identified as the main reaction products. The mineralogical and chemical compositions of the slags played a crucial role in influencing the carbonation process. This transformation altered the slags' properties, converting them from latent hydraulic materials into pozzolanic supplementary cementitious materials. However, carbonation alone did not significantly enhance composite cement performance. To optimize the cement composition, the addition of calcium sulphate, hydration accelerators, or a combination of both, depending on the characteristics of the slag used, was necessary.

Source: Construction and Building Materials

DOI: 10.1016/j.conbuildmat.2025.142271

Authors: Giada Biava, Maciej Zajac, Antonio Princigallo, Laura E. Depero, Mohsen Ben Haha, Elza Bontempi

Institutions: National Interuniversity Consortium of Materials Science and Technology, University of Brescia

Language: English

Topic: Concrete and Cement Materials Research

Subfield: Civil and Structural Engineering

Field: Engineering

Domain: Physical Sciences

SDGs: Responsible consumption and production, Climate action

Open Access status: hybrid

Estimated APC paid: $4,540