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<p>Traditional concrete exhibits limited effectiveness in enhancing the fiber-matrix interface in carbon fiber reinforced concrete (CFRC). In this work, KH560 was employed to modify the surface of carbon fibers (CF), aiming to improve their bonding interaction with the cement matrix. The enhancement mechanism was investigated using a multi-scale analytical approach, with particular emphasis on interfacial adhesion and overall mechanical performance. Macro-scale mechanical testing revealed that, at a CF content of 0.6%, KH560-modified CFRC achieved a 9% improvement in compressive performance and a 25% gain in flexural resistance compared to its unmodified counterpart. Microscopic analyses (SEM, XRD, FTIR) indicated that KH560 enhanced interfacial bonding, optimized the pore structure, and induced condensation reactions between CF and KH560, leading to the formation of Si–O–C and Si–O–Si bonds, thereby increasing interfacial bond strength. Molecular dynamics (MD) simulations further demonstrated that KH560-treated CF improved interfacial adhesion with the cement matrix through hydrogen bonding and ionic interactions, resulting in a structurally stable interface at the molecular level. A graphical abstract is provided below.</p> Graphical abstract <p></p>

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Multi-scale investigation of interfacial enhancement in KH560-modified carbon fiber reinforced concrete

  • 期刊论文

  • 发表日期：

    2025年6月3日

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  • Hongliang Jiang,
  • Yong Feng,
  • Lijuan Li,
  • Longteng Lv,
  • Sharafat Ali

摘要

Traditional concrete exhibits limited effectiveness in enhancing the fiber-matrix interface in carbon fiber reinforced concrete (CFRC). In this work, KH560 was employed to modify the surface of carbon fibers (CF), aiming to improve their bonding interaction with the cement matrix. The enhancement mechanism was investigated using a multi-scale analytical approach, with particular emphasis on interfacial adhesion and overall mechanical performance. Macro-scale mechanical testing revealed that, at a CF content of 0.6%, KH560-modified CFRC achieved a 9% improvement in compressive performance and a 25% gain in flexural resistance compared to its unmodified counterpart. Microscopic analyses (SEM, XRD, FTIR) indicated that KH560 enhanced interfacial bonding, optimized the pore structure, and induced condensation reactions between CF and KH560, leading to the formation of Si–O–C and Si–O–Si bonds, thereby increasing interfacial bond strength. Molecular dynamics (MD) simulations further demonstrated that KH560-treated CF improved interfacial adhesion with the cement matrix through hydrogen bonding and ionic interactions, resulting in a structurally stable interface at the molecular level. A graphical abstract is provided below.

Graphical abstract