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The steel industry produces basic oxygen furnace slag (BOFS), a secondary material that might be utilized in the building sector in place of natural aggregates. The problem with using BOFS as a component of an aggregate is that it causes volume growth within the matrix of concrete when free magnesium oxide (f-MgO) or free calcium oxide (f-CaO) constituents in BOFS combine to generate magnesium hydroxide (Mg(OH)₂) or calcium hydroxide (Ca(OH)₂). Two possible solutions to the BOFS expansion issue are CO₂ curing (mineral sequestration) and the geopolymerization process. This research examined the characteristics of expansion and compressive strength of geopolymer mortar based on BOFS under various curing conditions and times. Four distinct curing regimes air, water, steam, and a combination of steam and CO₂ were assessed. Additionally, two different durations of 6 and 12 h for both CO2 and steam curing were compared. The strength of compression associated with the BOFS-based geopolymer is increased by combining CO₂ and steam curing and by bare steam curing, according to the results, while the curing regime does not affect the water expansion characteristics. For the development of compressive strength and stabilizing the water expansion curve fluctuation, a 12 h curing period is preferable than a 6 h curing period, for both steam and CO₂ curing.

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Compressive Strength and Expansion Characteristics of BOFS-Based Geopolymer Mortar Under Different Curing Regimes

  • 会议论文

  • 发表日期：

    2025年

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  • Zarina Onopriyenko,
  • Chang-Seon Shon,
  • Dichuan Zhang,
  • Jong Ryeol Kim

摘要

The steel industry produces basic oxygen furnace slag (BOFS), a secondary material that might be utilized in the building sector in place of natural aggregates. The problem with using BOFS as a component of an aggregate is that it causes volume growth within the matrix of concrete when free magnesium oxide (f-MgO) or free calcium oxide (f-CaO) constituents in BOFS combine to generate magnesium hydroxide (Mg(OH)₂) or calcium hydroxide (Ca(OH)₂). Two possible solutions to the BOFS expansion issue are CO₂ curing (mineral sequestration) and the geopolymerization process. This research examined the characteristics of expansion and compressive strength of geopolymer mortar based on BOFS under various curing conditions and times. Four distinct curing regimes air, water, steam, and a combination of steam and CO₂ were assessed. Additionally, two different durations of 6 and 12 h for both CO2 and steam curing were compared. The strength of compression associated with the BOFS-based geopolymer is increased by combining CO₂ and steam curing and by bare steam curing, according to the results, while the curing regime does not affect the water expansion characteristics. For the development of compressive strength and stabilizing the water expansion curve fluctuation, a 12 h curing period is preferable than a 6 h curing period, for both steam and CO₂ curing.