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<p>This study explored the feasibility of developing brucite-based manufactured aggregates for carbon sequestration in construction materials. A systematic methodology for pure brucite extraction to produce manufactured aggregates; effect of water-to-solid (w/s) weight ratio (0.50–0.70) and curing conditions (carbonation versus ambient curing) on the mechanical strength and carbon sequestration potential, was investigated. The underlying mechanisms affecting the mechanical properties and carbon sequestration were studied. At an optimal w/s ratio of 0.65, carbonated manufactured aggregates showed a 2.5 times compressive strength than ambient-cured manufactured aggregates and a carbon sequestration potential of 23 wt%. The lower porosity, higher bond energy density for carbonates, and strong C–O bonds explain the improved mechanical strength of carbon-mineralized manufactured aggregates. The study also demonstrated that the absence of an intermittent hydrolysis step in the pure brucite system led to higher carbon sequestration than the reactive magnesia cement system, despite brucite carbonation in both systems.</p>

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Feasibility and mechanistic study on brucite-based carbon-mineralized manufactured aggregates

  • 期刊论文

  • 发表日期：

    2026年3月17日

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  • Xi Chen,
  • Xi Chen,
  • Tangwei Mi,
  • Dhanendra Kumar,
  • En-Hua Yang

摘要

This study explored the feasibility of developing brucite-based manufactured aggregates for carbon sequestration in construction materials. A systematic methodology for pure brucite extraction to produce manufactured aggregates; effect of water-to-solid (w/s) weight ratio (0.50–0.70) and curing conditions (carbonation versus ambient curing) on the mechanical strength and carbon sequestration potential, was investigated. The underlying mechanisms affecting the mechanical properties and carbon sequestration were studied. At an optimal w/s ratio of 0.65, carbonated manufactured aggregates showed a 2.5 times compressive strength than ambient-cured manufactured aggregates and a carbon sequestration potential of 23 wt%. The lower porosity, higher bond energy density for carbonates, and strong C–O bonds explain the improved mechanical strength of carbon-mineralized manufactured aggregates. The study also demonstrated that the absence of an intermittent hydrolysis step in the pure brucite system led to higher carbon sequestration than the reactive magnesia cement system, despite brucite carbonation in both systems.