Preparation, Performance Optimization, and Environmental Benefits of Precisely Carbonated Reactive Magnesia Cement
DOI:
https://doi.org/10.54691/7ayf8v47Keywords:
Reactive Magnesia Cement; Precise Carbonation; Backfiring Suppression; Carbon-Negative Material; Phase Composition Regulation.Abstract
This study addresses the technical challenges of high carbon emissions in traditional Portland cement and the tendency of Magnesia Oxychloride Cement (MOC) to undergo "backfiring" (oxidative cracking). A novel preparation method for reactive magnesia cement is proposed, based on precise control of CO₂ concentration (10⁻³.⁴–10⁻⁰.⁷ atm), which promotes the stable formation of hydromagnesite (Mg₅(CO₃)₄(OH)₂·4H₂O). This significantly enhances material strength (compressive strength up to 120 MPa) and weather resistance. Combining PHREEQC thermodynamic simulations and X-ray diffraction analysis, the regulatory mechanisms of additives (FeSO₄·7H₂O/KH₂PO₄) on MOC phase composition were elucidated. The results show that this cement achieves a net carbon sequestration of 0.12 tons per ton over its lifecycle, reducing emissions by 82% compared to traditional cement. Additionally, the calcination temperature of raw materials is lowered by 73% (700–1000°C vs. 1450°C). Reactive magnesia cement is cost-effective, eco-friendly, and holds significant development potential.
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