Work

Influence of limestone filler on potassium citrate activated BOF slag binder

Year: 2025

Type: article

Abstract: Basic Oxygen Furnace slag (BOF slag) is a by-product of steelmaking, which is mainly composed of C 2 S and Brownmillerite (C 4 (A, F), which give it cementitious properties. Previous work reveals that citrate salts can activate Brownmillerite to obtain a performant binder based on BOF slag without including any Portland cement. Nevertheless, the C 2 S is still not activated in this system, and its early reactivity remains very low. The effect of limestone on the mechanical properties of the binder and its phase assemblage are investigated and compared to the effect of quartz. The results show that the use of fillers improves the performances of the BOF slag pastes with more hydration products being formed. They highlight the superior effect of fine limestone incorporation, compared to quartz, with a minimum dosage of 9 vol%. The resulting BOF slag binder exhibits an increase in compressive strength of 55 % compared to the reference and a decreased total porosity.

Source: Construction and Building Materials

DOI: 10.1016/j.conbuildmat.2025.143424

Authors: S. Yvars, K. Schollbach, T. Wattez, S. Van der Laan, H.J.H. Brouwers

Institution: Eindhoven University of Technology

Language: English

Topic: Concrete and Cement Materials Research

Subfield: Civil and Structural Engineering

Field: Engineering

Domain: Physical Sciences

SDG: Responsible consumption and production

Open Access status: hybrid

Estimated APC paid: $4,540