Development of highly reactive partially calcined dolomite precursor: Synergistic effect CaO and MgO

Abstract This study introduces a novel rapid calcination method for partially calcined dolomite (PCD) precursors, offering a transformative approach to sustainable cementitious materials. Unlike traditional partial calcination, which involves prolonged thermal treatment, this rapid process (0–5 min) minimizes energy consumption and CO₂ emissions by leveraging the distinct decomposition kinetics of MgCO 3 and CaCO 3 . This method's tailored Mg/Ca ratio significantly enhances hydration kinetics, producing a core‐shell microstructure that synergistically balances early strength and long‐term durability. Thermodynamic modeling and experimental analyses reveal that the early hydration is dominated by CaO, forming calcium silicate hydrate (C‐S‐H). In contrast, the gradual hydration of MgO supports long‐term stability through magnesium silicate hydrate (M‐S‐H) and hydrotalcite phases. This method provides a scalable pathway for upcycling low‐grade dolomite into high‐performance cementitious materials, offering a sustainable solution for the construction industry.