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<p>This study investigates the durability of mineral-coated carbon fiber yarns in cement-based composites under harsh environmental conditions, including alkaline exposure, freeze-thaw (FpT), and freeze-thaw salt (FTS) cycles. Carbon, basalt, and glass fibers were initially tested in a cement pore solution (pH 12.6), where carbon fibers retained over 90% of their tensile strength after 28 days, outperforming the others. Carbon fibers were then coated with cementitious composites using a continuous roll-to-roll method at different water-to-cement (w/c) ratios of 0.6, 0.8, and 1.0. After 56 FT and FTS cycles, up to 40% reduction in bending strength was observed. Fibers with 0.6 w/c coating performed best, attributed to improved coating density. ESEM revealed mineral crystal formation on fiber surfaces, enhancing tensile performance in alkaline environments. MIP analysis showed increased matrix porosity after FT/FTS cycles, facilitating water and chloride ingress and accelerating degradation. Overall, the study demonstrates that optimizing the coating quality of carbon fibers, particularly at a 0.6 w/c ratio which significantly improves their resistance to cyclic freeze-thaw damage, providing a pathway for durable carbon fiber-reinforced cementitious composites.</p>

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Durability assessment of carbon fiber yarns in cementitious composites under freeze thaw and alkaline exposure

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2025年10月11日

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  • Asad Naeem,
  • Muhammad Saqib Khan,
  • Muhammad Imran Khan,
  • Abdulmoez Abdulwhab Al Ismaeel,
  • Md. Arifuzzaman,
  • Kaffayatullah Khan

摘要

This study investigates the durability of mineral-coated carbon fiber yarns in cement-based composites under harsh environmental conditions, including alkaline exposure, freeze-thaw (FpT), and freeze-thaw salt (FTS) cycles. Carbon, basalt, and glass fibers were initially tested in a cement pore solution (pH 12.6), where carbon fibers retained over 90% of their tensile strength after 28 days, outperforming the others. Carbon fibers were then coated with cementitious composites using a continuous roll-to-roll method at different water-to-cement (w/c) ratios of 0.6, 0.8, and 1.0. After 56 FT and FTS cycles, up to 40% reduction in bending strength was observed. Fibers with 0.6 w/c coating performed best, attributed to improved coating density. ESEM revealed mineral crystal formation on fiber surfaces, enhancing tensile performance in alkaline environments. MIP analysis showed increased matrix porosity after FT/FTS cycles, facilitating water and chloride ingress and accelerating degradation. Overall, the study demonstrates that optimizing the coating quality of carbon fibers, particularly at a 0.6 w/c ratio which significantly improves their resistance to cyclic freeze-thaw damage, providing a pathway for durable carbon fiber-reinforced cementitious composites.