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<p>Ultra-high performance concrete (UHPC) has garnered increasing attention in the construction industry due to its exceptional mechanical properties and durability. However, its widespread application remains constrained by high costs and significant shrinkage. The incorporation of coarse aggregate (CA) offers a viable solution to mitigate these limitations. This study systematically investigates the cube compressive strength, axial compressive strength, splitting tensile strength, and size effect of UHPC with CA (UHPC-CA) under various loading conditions. A total of 72 specimens with varying CA contents were tested, revealing that CA content significantly influences the failure modes of UHPC-CA under different stress states. With increasing CA content, the compressive strengths exhibited a general upward trend, whereas the splitting tensile strength initially declined before stabilizing. Compared to compressive strength, a more pronounced size effect was observed in splitting tensile strength, particularly in specimens with higher CA content. Based on regression analysis of the experimental results, empirical equations were proposed to predict axial compressive and splitting tensile strengths as functions of cube compressive strength. Furthermore, a mesoscale finite element model was developed in ABAQUS to simulate the mechanical behavior of UHPC-CA, incorporating a non-uniform field representation of the compressive strength of mortar matrix to capture the inherent heterogeneity of UHPC-CA. The strong agreement between numerical and experimental results, both in terms of failure patterns and compressive strength, underscores the reliability of the proposed model in evaluating the influence of CA content on the strength characteristics and size effect of UHPC-CA.</p>

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Experimental investigation on the mechanical performance and its size effect of ultra-high performance concrete containing coarse aggregate

  • 期刊论文

  • 发表日期：

    2025年6月23日

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  • Qin Wang,
  • Zhihao Tong,
  • Deng Li,
  • Le Huang

摘要

Ultra-high performance concrete (UHPC) has garnered increasing attention in the construction industry due to its exceptional mechanical properties and durability. However, its widespread application remains constrained by high costs and significant shrinkage. The incorporation of coarse aggregate (CA) offers a viable solution to mitigate these limitations. This study systematically investigates the cube compressive strength, axial compressive strength, splitting tensile strength, and size effect of UHPC with CA (UHPC-CA) under various loading conditions. A total of 72 specimens with varying CA contents were tested, revealing that CA content significantly influences the failure modes of UHPC-CA under different stress states. With increasing CA content, the compressive strengths exhibited a general upward trend, whereas the splitting tensile strength initially declined before stabilizing. Compared to compressive strength, a more pronounced size effect was observed in splitting tensile strength, particularly in specimens with higher CA content. Based on regression analysis of the experimental results, empirical equations were proposed to predict axial compressive and splitting tensile strengths as functions of cube compressive strength. Furthermore, a mesoscale finite element model was developed in ABAQUS to simulate the mechanical behavior of UHPC-CA, incorporating a non-uniform field representation of the compressive strength of mortar matrix to capture the inherent heterogeneity of UHPC-CA. The strong agreement between numerical and experimental results, both in terms of failure patterns and compressive strength, underscores the reliability of the proposed model in evaluating the influence of CA content on the strength characteristics and size effect of UHPC-CA.