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高温处理后活性粉末混凝土动力学行为及本构模型研究

DOI: 10.11858/gywlxb.2012.04.001, PP. 361-368

Keywords: 分离式霍普金森压杆,活性粉末混凝土,高温,动态力学性能,本构模型,扫描电镜

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Abstract:

利用分离式霍普金森压杆系统,采用铅片作为整形器,分别对常温下及400、600、800℃高温处理后的活性粉末混凝土(ReactivePowderConcrete,RPC)试样进行单轴冲击压缩实验,研究高温后RPC材料的动态力学性能,建立高温处理后材料的率型本构模型。结果表明:经不同高温处理后的RPC材料的动态抗压强度和韧性指标均有较明显的应变率敏感性,而峰值应变、初始弹性模量受应变率影响不大;不同应变率下,400℃以上高温处理后RPC材料的单轴动态压缩力学性能有所降低。扫描电镜分析表明,高温处理后RPC材料微观结构的劣化是宏观力学性能降低的根本原因。对ZWT粘弹性本构模型进行了修正,修正后的模型适用于混凝土材料经高温处理后的率型本构关系的分析。

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