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<p>To examine the effects of water content at positive and negative temperature on the mechanical behavior of the rock–concrete interface, Brazilian split tests were performed on rock–concrete composites. The fracture surface microstructure was analyzed using scanning electron microscopy (SEM). The key findings are as follows: (1) At 20&#xa0;°C, the nominal tensile strength of the specimens gradually decreases with increasing water content. In contrast, at − 20&#xa0;°C, the tensile strength initially increases and then decreases as water content rises. (2) At 20&#xa0;°C, higher water content increases the likelihood of adhesion failure at the interface. Conversely, at − 20&#xa0;°C, elevated water content favors cohesion failure within the interface region. (3) Quantitative analysis of SEM images using digital image processing revealed that at 20&#xa0;°C, the voidage increases with higher water content. However, at − 20&#xa0;°C, the voidage first decreases and then increases as water content rises. These findings provide valuable insights for civil engineering design and construction in both positive and negative environments.</p>

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Influence of moisture content on failure behavior of the rock–concrete interface at positive and negative temperatures under tensile loading

  • 期刊论文

  • 发表日期：

    2026年4月8日

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  • Lin Luo,
  • Xiong Liu,
  • Ronghua Shu,
  • Jiadong Qiu,
  • Yingjie He,
  • Shaowei Liu,
  • Ziwen Zhang

摘要

To examine the effects of water content at positive and negative temperature on the mechanical behavior of the rock–concrete interface, Brazilian split tests were performed on rock–concrete composites. The fracture surface microstructure was analyzed using scanning electron microscopy (SEM). The key findings are as follows: (1) At 20 °C, the nominal tensile strength of the specimens gradually decreases with increasing water content. In contrast, at − 20 °C, the tensile strength initially increases and then decreases as water content rises. (2) At 20 °C, higher water content increases the likelihood of adhesion failure at the interface. Conversely, at − 20 °C, elevated water content favors cohesion failure within the interface region. (3) Quantitative analysis of SEM images using digital image processing revealed that at 20 °C, the voidage increases with higher water content. However, at − 20 °C, the voidage first decreases and then increases as water content rises. These findings provide valuable insights for civil engineering design and construction in both positive and negative environments.