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Mechanistic insights into the role of brucite in magnesium phosphate cement: Regulating hydration kinetics, microstructure evolution, and sustainability
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DOI：10.1016/j.susmat.2026.e02168.png)
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Abstract
En 中文
Magnesium phosphate cement (MPC) is recognized for its rapid setting and high early strength, yet its application is limited by the high energy demand and carbon emissions associated with dead-burned MgO production. In this study, natural brucite was used as a partial replacement for MgO to evaluate its effects on hydration kinetics, microstructure evolution, mechanical properties, and environmental impact. The incorporation of brucite lowers the early-stage pH and provides heterogeneous nucleation sites, thereby accelerating hydration. However, this leads to rapid, non-equilibrium crystallization of K-struvite with low crystallinity, resulting in a porous microstructure and reduced early strength. With continued curing, the gradual dissolution of brucite releases Mg2+, sustaining hydration and promoting pore refinement. Consequently, the microstructure becomes denser, and compressive strength recovers and further improves at appropriate replacement levels. The optimal performance is achieved at a 10% substitution level, reaching 103.1 MPa. Additionally, moderate brucite incorporation reduces drying shrinkage and enhances volume stability. From a sustainability perspective, replacing MgO with brucite significantly reduces both energy consumption and CO2 emissions, with maximum reductions of 18.4% and 23.9%, respectively. These findings demonstrate that brucite incorporation offers an effective strategy to regulate hydration behavior, tailor microstructural evolution, and reduce environmental impact, providing a promising pathway toward the development of high-performance and sustainable MPC systems.
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