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<p>The effects of various fly ash (FA) contents on the durability and mechanical properties of recycled fine aggregate high ductility cementitious composites (RFA-HDCC) prepared with recycled fine aggregates (RFA) to fully replace natural fine aggregates was investigated. The results indicated that a 50% FA content significantly increased the compressive strength of RFA-HDCC by 13.93%. However, a further increase in FA content led to a drastic decrease. The increased fly ash content substantially reduced the flexural and tensile strength; however, it markedly increased the matrix strain capacity, resulting in a 53.73% increase in the peak strain when FA was raised to 70%. Regarding durability, the increase in FA content negatively affected the chloride ion permeability and carbonation resistance. However, the increase in FA content initially improved the frost resistance of RFA-HDCC, peaking at 50% FA and deteriorating at 60% and 70% FA content.</p>

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Effect of Fly Ash Contents on the Durability and Mechanical Properties of Recycled Fine Aggregate High Ductility Cementitious Composites

  • 期刊论文

  • 发表日期：

    2025年10月29日

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  • Xinjie Wang,
  • Olivier Byiringiro,
  • Jiagai Yang,
  • Pinghua Zhu,
  • Xiancui Yan,
  • Hui Liu

摘要

The effects of various fly ash (FA) contents on the durability and mechanical properties of recycled fine aggregate high ductility cementitious composites (RFA-HDCC) prepared with recycled fine aggregates (RFA) to fully replace natural fine aggregates was investigated. The results indicated that a 50% FA content significantly increased the compressive strength of RFA-HDCC by 13.93%. However, a further increase in FA content led to a drastic decrease. The increased fly ash content substantially reduced the flexural and tensile strength; however, it markedly increased the matrix strain capacity, resulting in a 53.73% increase in the peak strain when FA was raised to 70%. Regarding durability, the increase in FA content negatively affected the chloride ion permeability and carbonation resistance. However, the increase in FA content initially improved the frost resistance of RFA-HDCC, peaking at 50% FA and deteriorating at 60% and 70% FA content.