1. College of Civil Engineering, Nanjing Tech University, Nanjing 211816, China;
2. International Center for Integrated Protection Research of Engineering Structures, Nanjing Tech University,Nanjing 211816, China;
3. College of Civil Engineering and Architecture, Guangxi University of Science and Technology, Liuzhou 545006, China;
4. College of Civil Engineering and Architecture, Guangxi University, Nanning 530004, China;
5. Key Laboratory of Disaster Prevention and Structural Safety of Chinese Ministry of Education, Guangxi University, Nanning 530004, China
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
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 Jinjun1,2， TANG Yueyue1， CHEN Yuliang3， CHEN Zongping4,5. Split-Hopkinson pressure bar tests on dynamic properties of concrete made of seawater and marine aggregates. JOURNAL OF VIBRATION AND SHOCK, 2022, 41(14): 233-242.
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