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Dynamic behaviour of normal-strength carbonate aggregate concrete at temperatures up to 800℃

机译：普通碳酸盐骨料混凝土在800℃以下的动力特性

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摘要

The impact resistance of normal-strength carbonate concrete at elevated temperatures up to 800℃ was experimentally studied using a split Hopkinson pressure bar (SHPB). The SHPB impact tests focused on the effects of concrete design strengths, high temperature and strain rate on the dynamic behaviour of concrete at elevated temperatures. The stress-time and strain-time curves of the tested specimens were recorded to analyse the impact behaviour of concrete at elevated temperatures. The influences of static compressive strength, high temperature and strain rate on the dynamic peak strength of concrete are discussed. The test results show that the strain rate effect of concrete at elevated temperature is significantly different from that of concrete at room temperature. Within the scope of the SHPB impact tests in this work, the strain rate effects of concrete at 200℃ and 300℃ are obviously higher than at room temperature. Concrete heated to 400℃ was found to recover to around the same level of the dynamic strength increase factor (DIF) values of concrete at 20℃. The strain rate effects of concrete at 600℃ and 800℃ deteriorated sharply compared with those of concrete at room temperature and lower than 600℃ This paper also shows that a previously recommended formula for the DIF is not suitable for predicting the dynamic behaviour of concrete at temperatures higher than 400℃.
机译：使用剖开式霍普金森压力棒（SHPB），通过实验研究了普通强度碳酸盐混凝土在高达800℃的高温下的抗冲击性。 SHPB冲击测试的重点是混凝土设计强度，高温和应变率对高温下混凝土动力特性的影响。记录测试样品的应力时间曲线和应变时间曲线，以分析混凝土在高温下的冲击行为。讨论了静态抗压强度，高温和应变率对混凝土动态峰值强度的影响。试验结果表明，高温下混凝土的应变率效应与室温下混凝土的应变率效应明显不同。在这项工作的SHPB冲击试验范围内，混凝土在200℃和300℃的应变率效应明显高于室温。发现加热到400℃的混凝土在20℃时恢复到与混凝土的动态强度增加因子（DIF）值相同的水平。与室温和低于600℃的混凝土相比，混凝土在600℃和800℃的应变率效应急剧下降。本文还表明，先前推荐的DIF公式不适用于预测混凝土的动态特性。温度高于400℃。

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  • 来源
    《Magazine of Concrete Research》 |2014年第20期|975-990|共16页
  • 作者

    Jingsi Huo; Penq Wang; Qi Yu; Yuanming He;

  • 作者单位

    China Ministry of Education Key Laboratory of Building Safety and Energy Efficiency, College of Civil Engineering, Hunan University, Changsha, PR China;

    China Ministry of Education Key Laboratory of Building Safety and Energy Efficiency, College of Civil Engineering, Hunan University, Changsha, PR China;

    China Ministry of Education Key Laboratory of Building Safety and Energy Efficiency, College of Civil Engineering, Hunan University, Changsha, PR China;

    China Ministry of Education Key Laboratory of Building Safety and Energy Efficiency, College of Civil Engineering, Hunan University, Changsha, PR China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
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