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<p>Recycling fly ash (FA) in cement composites for sand conservation due to its overexploitation for construction activities is necessary, contributing to environmental sustainability and a developed circular economy. This study investigated the mechanical-durability properties of high-performance concrete (HPC) with FA replacing sand at 35, 50, and 65%, and compared with control HPCs and those incorporating 35% Ground granulated blast furnace slag (GGBS) and 10% silica fume (SF) as partial cement substitutes. The findings showed that HPCs utilizing FA exhibited long-term performance comparable to those incorporating GGBS or SF regarding compressive and flexural strengths, porosity, water capillary absorption, surface resistivity, and chloride penetration resistance. Notably, the estimated time to corrosion of reinforcements in structures using FA-HPCs indicated an extended service life, around 7.3–9.4 times longer than that of control HPC. Additionally, an evaluation of the environmental-economic efficiency per service life confirmed the most effectiveness of FA-HPCs with a reduction in material cost, energy consumption, and carbon dioxide emissions at approximately 86.44–88.11, 86.36–89.04, 86.39–89.05%, respectively.</p>

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Recycling fly ash in high-performance concrete for sand conservation: durability, service life, and environmental benefits

  • 期刊论文

  • 发表日期：

    2025年3月9日

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  • Quan Van Ho,
  • Tuan H. Nguyen,
  • Phuong N. Pham,
  • Phuong H. N. Luong,
  • Phat Nguyen,
  • Rafat Siddique

摘要

Recycling fly ash (FA) in cement composites for sand conservation due to its overexploitation for construction activities is necessary, contributing to environmental sustainability and a developed circular economy. This study investigated the mechanical-durability properties of high-performance concrete (HPC) with FA replacing sand at 35, 50, and 65%, and compared with control HPCs and those incorporating 35% Ground granulated blast furnace slag (GGBS) and 10% silica fume (SF) as partial cement substitutes. The findings showed that HPCs utilizing FA exhibited long-term performance comparable to those incorporating GGBS or SF regarding compressive and flexural strengths, porosity, water capillary absorption, surface resistivity, and chloride penetration resistance. Notably, the estimated time to corrosion of reinforcements in structures using FA-HPCs indicated an extended service life, around 7.3–9.4 times longer than that of control HPC. Additionally, an evaluation of the environmental-economic efficiency per service life confirmed the most effectiveness of FA-HPCs with a reduction in material cost, energy consumption, and carbon dioxide emissions at approximately 86.44–88.11, 86.36–89.04, 86.39–89.05%, respectively.