海水海洋骨料混凝土霍普金森压杆动态力学性能试验研究

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振动与冲击 ›› 2022, Vol. 41 ›› Issue (14) : 233-242.

论文

徐金俊1,2，唐月月1，陈宇良3，陈宗平4,5

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Split-Hopkinson pressure bar tests on dynamic properties of concrete made of seawater and marine aggregates

XU Jinjun1,2， TANG Yueyue1， CHEN Yuliang3， CHEN Zongping4,5

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摘要

为研究海水海洋骨料混凝土动态受压力学行为，采用155 mm大直径分离式霍普金森压杆（separated Hopkinson pressure bar ，SHPB）试验装置开展了15个淡水河砂碎石混凝土、15个海水海砂碎石混凝土和15个海水海砂珊瑚混凝土在不同冲击气压下的动力荷载试验研究，并分别与各自混凝土（累计9个）在静力荷载作用下的受压性能进行了对比分析。研究结果表明：淡水河砂碎石混凝土和海水海砂碎石混凝土的破坏面在于骨料与水泥浆体的界面区，而海水海砂珊瑚混凝土的薄弱点为珊瑚骨料本身；淡水河砂碎石混凝土和海水海洋骨料混凝土的破碎程度、峰值应力、峰值应变、能量吸收密度、动态强度放大系数均随应变率的增加而增大；在同级应变率下，海水海砂珊瑚混凝土的动态峰值应力最大，海水海砂碎石混凝土的次之，淡水河砂碎石混凝土的最小，而应变延性系数正相反；海水海砂珊瑚混凝土的动态峰值应变和能量吸收密度比海水海砂碎石混凝土和淡水河砂碎石混凝土的大；基于欧洲混凝土规范CEB的预测曲线基本能反映海水海洋骨料混凝土动态强度放大系数与应变率之间的关系，而相应的吻合程度也体现了海水海砂珊瑚混凝土比淡水河砂碎石混凝土和海水海砂碎石混凝土的应变率效应更加显著。
关键词：海洋骨料；混凝土；静力性能；动力性能；能量吸收密度；应变率

Abstract

In order to investigate the dynamic properties of seawater-marine aggregate concrete, separated Hopkinson pressure bar（SHPB） test facility was employed to conduct the dynamic loading test on fifteen fresh water-river sand-crushed stone concrete specimens, fifteen seawater-sea sand-crushed stone concrete specimens and fifteen seawater-sea sand-coral concrete specimens under different impact pressures. For comparison, each concrete in total nine specimens was tested under static loading. The results show that the failure plane of flesh water-river sand-crushed stone concrete and seawater-sea sand-crushed stone concrete exhibits in the interface region of aggregate-cement mortar, while the weak point of seawater-sea sand-coral concrete is the coral aggregate itself. The damage degree, peak stress, peak strain, energy absorption density, dynamic strength increase factor of fresh water-river sand-crushed stone concrete and seawater-marine aggregate concrete increase with an increase of strain rate. For the same strain rate, seawater-sea sand-coral concrete have the largest dynamic peak stress and fresh water-river sand-crushed stone concrete have the smallest one, while the strain ductility coefficient is the opposite. The dynamic peak strain and energy absorption density of seawater-sea sand-coral concrete are higher than those of fresh water-river sand-crushed stone concrete and seawater-sea sand-crushed stone concrete. Comite Euro-International du Beton (CEB)-based predictive curve can basically reflect the relationship between dynamic strength increase factor and strain rate of seawater-marine aggregate concrete, and the corresponding degree of coincidence demonstrates that the strain rate effect of seawater-sea sand-coral concrete is more significant than that of fresh water-river sand-crushed stone concrete and seawater-sea sand-crushed stone concrete.
Keywords：marine aggregates; concrete; static properties; dynamic properties; energy absorption density; strain rate

导出引用

徐金俊1,2，唐月月1，陈宇良3，陈宗平4,5. 海水海洋骨料混凝土霍普金森压杆动态力学性能试验研究[J]. 振动与冲击, 2022, 41(14): 233-242

XU Jinjun1,2， TANG Yueyue1， CHEN Yuliang3， CHEN Zongping4,5. Split-Hopkinson pressure bar tests on dynamic properties of concrete made of seawater and marine aggregates[J]. Journal of Vibration and Shock, 2022, 41(14): 233-242

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