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<p>This study investigates the impact of lightweight fillers on the mechanical behavior of lightweight engineered cementitious composites (LECC). The effects of four types of fillers on the mechanical properties and microstructure of LECC are evaluated through uniaxial compression, single-crack tension, and three-point bending fracture toughness tests. The strain-hardening index of LECC is determined to assess the suitability of different fillers. The experimental results show that the density of the prepared LECC ranges from 683 to 1068&#xa0;kg/m<sup>3</sup>, approximately 60-70% lower than conventional concrete. The specimens exhibit typical tensile strain-hardening behavior with exceptional tensile ductility. Among the fillers, hollow glass microspheres (HGM) effectively reduce the density, achieving a minimum LECC density of 683&#xa0;kg/m<sup>3</sup>, while maintaining favorable compressive and tensile properties, with a tensile strain capacity of up to 4.7%. Microstructural analysis reveals that the regular spherical morphology of the microspheres contributes to a more homogeneous and compact matrix, enhancing fiber/matrix interfacial properties and improving the strain-hardening index, which enhances the tensile deformation capability of LECC. Meanwhile, the smooth surface of the HGM leads to weak adhesion with the cement matrix, reducing fracture toughness and acting as crack initiation sites for multiple cracking, thus promoting the multiple cracking capacity of LECC.</p>

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Study on the Influence of Lightweight Filler Introduction on Mechanical Properties and Microstructure of LECC

  • 期刊论文

  • 发表日期：

    2025年11月11日

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  • Ming-Zhao Chen,
  • Rong-Xin Guo,
  • Fei Li,
  • Yi-Fan Li,
  • Ying-Xiong Zhang,
  • Chao-Shu Fu

摘要

This study investigates the impact of lightweight fillers on the mechanical behavior of lightweight engineered cementitious composites (LECC). The effects of four types of fillers on the mechanical properties and microstructure of LECC are evaluated through uniaxial compression, single-crack tension, and three-point bending fracture toughness tests. The strain-hardening index of LECC is determined to assess the suitability of different fillers. The experimental results show that the density of the prepared LECC ranges from 683 to 1068 kg/m3, approximately 60-70% lower than conventional concrete. The specimens exhibit typical tensile strain-hardening behavior with exceptional tensile ductility. Among the fillers, hollow glass microspheres (HGM) effectively reduce the density, achieving a minimum LECC density of 683 kg/m3, while maintaining favorable compressive and tensile properties, with a tensile strain capacity of up to 4.7%. Microstructural analysis reveals that the regular spherical morphology of the microspheres contributes to a more homogeneous and compact matrix, enhancing fiber/matrix interfacial properties and improving the strain-hardening index, which enhances the tensile deformation capability of LECC. Meanwhile, the smooth surface of the HGM leads to weak adhesion with the cement matrix, reducing fracture toughness and acting as crack initiation sites for multiple cracking, thus promoting the multiple cracking capacity of LECC.