高强混凝土抗压强度预测模型:基于母岩弹性模量
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1.中国铁道科学研究院;2.高速铁路轨道系统全国重点实验室

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TU521.4

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国家铁路局标准科研,铁路机制砂场建设及混凝土质量控制标准研究(2023JS007); 国铁集团课题,铁路工程再生混凝土设计理论与性能调控(L2022G009)


A Prediction Model for the Compressive Strength of High-strength Concrete: Based on the Elastic Modulus of Parent Rock
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1.China Academy of Railway Sciences;2.National Key Laboratory of High Speed Railway Track System

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    摘要:

    机制骨料母岩的弹性模量是影响高强混凝土力学性能的重要因素。本文创新了峰值压应力下粗骨料与砂浆的受力假定,基于粗骨料—砂浆协调变形机理建立了先串联后并联的高强混凝土抗压强度预测模型。采用不同弹性模量的花岗岩和白云岩粗骨料制备了C60高强混凝土,结果表明花岗岩、白云岩粗骨料混凝土抗压强度预测值与实测值相差在10%以内,该模型可为预应力混凝土构件早期张拉龄期的确定及后期结构变形控制提供参考。

    Abstract:

    The elastic modulus of the parent rock for manufactured aggregates is a key factor influencing the mechanical properties of high-strength concrete. This study introduces a novel approach to assumptions about the forces acting on coarse aggregates and mortar under peak compressive stress. Based on the mechanism of coordinated deformation between coarse aggregates and mortar, a prediction model for the compressive strength of high-strength concrete has been developed, which initially considers a series configuration followed by a parallel arrangement. High-strength C60 concrete was created using granite and dolomite coarse aggregates with varying elastic moduli. The findings indicate that the predicted compressive strengths of the concrete made with granite and dolomite aggregates differ from the actual measured values by less than 10%. This model can serve as a reference for determining the appropriate tensioning age of prestressed concrete members and for controlling structural deformation in later stages.

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  • 收稿日期:2024-09-28
  • 最后修改日期:2024-12-11
  • 录用日期:2024-12-31
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