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<p>Using solid waste as a substitute for conventional cement has become an important way to reduce carbon emissions. This paper attempted to utilize steel slag (SS) and fly ash (FA) as supplementary cementitious material by utilizing CO<sub>2</sub> mineralization curing technology. This study examined the dominant and interactive influences of the residual water/cement ratio, CO<sub>2</sub> pressure, curing time, and SS content on the mechanical properties and CO<sub>2</sub> uptake rate of CO<sub>2</sub> mineralization curing SS-FA-Portland cement ternary paste specimens. Additionally, microstructural development was analyzed. The findings demonstrated that each factor significantly affected compressive strength and CO<sub>2</sub> uptake rate, with factor interactions becoming more pronounced at higher SS dosages (&gt;30%), lower residual water/cement ratios (0.1–0.15), and CO<sub>2</sub> pressures of 0.1–0.3 MPa. Microscopic examinations revealed that mineralization primarily yielded CaCO<sub>3</sub> and silica gel. The residual w/c ratio and SS content significantly influenced the CaCO<sub>3</sub> content and crystallinity of the mineralization products. Post-mineralization curing, the percentage of pores larger than 50 nm significantly decreased, the proportion of harmless pores smaller than 20 nm increased, and pore structure improved. This study also found that using CO<sub>2</sub> mineralization curing SS-FA-Portland cement solid waste concrete can significantly reduce the negative impact on the environment.</p>

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CO2 mineralization curing steel slag-fly ash-Portland cement ternary paste: Mechanical properties, microstructure and life cycle assessment

  • 期刊论文

  • 发表日期：

    2025年7月1日

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  • Guo-yang Yi,
  • Wei Tian,
  • Jun-jie Shi,
  • Jian Guo,
  • Xu Cheng

摘要

Using solid waste as a substitute for conventional cement has become an important way to reduce carbon emissions. This paper attempted to utilize steel slag (SS) and fly ash (FA) as supplementary cementitious material by utilizing CO2 mineralization curing technology. This study examined the dominant and interactive influences of the residual water/cement ratio, CO2 pressure, curing time, and SS content on the mechanical properties and CO2 uptake rate of CO2 mineralization curing SS-FA-Portland cement ternary paste specimens. Additionally, microstructural development was analyzed. The findings demonstrated that each factor significantly affected compressive strength and CO2 uptake rate, with factor interactions becoming more pronounced at higher SS dosages (>30%), lower residual water/cement ratios (0.1–0.15), and CO2 pressures of 0.1–0.3 MPa. Microscopic examinations revealed that mineralization primarily yielded CaCO3 and silica gel. The residual w/c ratio and SS content significantly influenced the CaCO3 content and crystallinity of the mineralization products. Post-mineralization curing, the percentage of pores larger than 50 nm significantly decreased, the proportion of harmless pores smaller than 20 nm increased, and pore structure improved. This study also found that using CO2 mineralization curing SS-FA-Portland cement solid waste concrete can significantly reduce the negative impact on the environment.