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<p>To promote the application of lightweight aggregate concrete in sulfate-rich environments, the evolution of its interfacial bonding behavior with normal concrete (NC) had to be clarified. Therefore, the direct shear test was employed to investigate the interfacial bonding behavior of full lightweight ceramsite concrete and NC in a sulfate environment. The experimental parameters included sulfate concentrations and erosion times. The interfacial behavior was assessed based on failure modes, load-slip curves, shear strength, shear stiffness, and fracture energy. The results showed that at concentrations of 5&#xa0;wt% and 7&#xa0;wt%, the failure mode of the specimens shifted unfavorably as erosion continued. With the increase of erosion time, the interfacial shear strength and fracture energy firstly increased and then significantly decreased to form an inflection point, and the increase of concentration led to an earlier appearance of the inflection point. The interfacial fracture energy was much more affected by sulfate than the interfacial shear strength. After 150 days of erosion, the fracture energy K value decreased to 49.8%–57.5%. In addition, equations for the evolution of interfacial shear strength, shear stiffness, and fracture energy were established.</p>

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Evolution of interfacial shear behavior between full lightweight ceramsite concrete and normal concrete under sulfate erosion

  • 期刊论文

  • 发表日期：

    2025年10月17日

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  • Hongbing Zhu,
  • Zhengfa Guo,
  • Zhenghao Fu,
  • Yu Xiao,
  • Siyu Wen

摘要

To promote the application of lightweight aggregate concrete in sulfate-rich environments, the evolution of its interfacial bonding behavior with normal concrete (NC) had to be clarified. Therefore, the direct shear test was employed to investigate the interfacial bonding behavior of full lightweight ceramsite concrete and NC in a sulfate environment. The experimental parameters included sulfate concentrations and erosion times. The interfacial behavior was assessed based on failure modes, load-slip curves, shear strength, shear stiffness, and fracture energy. The results showed that at concentrations of 5 wt% and 7 wt%, the failure mode of the specimens shifted unfavorably as erosion continued. With the increase of erosion time, the interfacial shear strength and fracture energy firstly increased and then significantly decreased to form an inflection point, and the increase of concentration led to an earlier appearance of the inflection point. The interfacial fracture energy was much more affected by sulfate than the interfacial shear strength. After 150 days of erosion, the fracture energy K value decreased to 49.8%–57.5%. In addition, equations for the evolution of interfacial shear strength, shear stiffness, and fracture energy were established.