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

被引：0
|
作者：
Xu J. [1 ,2 ]
Tang Y. [1 ]
Chen Y. [3 ]
Chen Z. [4 ,5 ]
机构：
[1] College of Civil Engineering, Nanjing Tech University, Nanjing
[2] International Center for Integrated Protection Research of Engineering Structures, Nanjing Tech University, Nanjing
[3] College of Civil Engineering and Architecture, Guangxi University of Science and Technology, Liuzhou
[4] College of Civil Engineering and Architecture, Guangxi University, Nanning
[5] Key Laboratory of Disaster Prevention and Structural Safety of Chinese Ministry of Education, Guangxi University, Nanning
来源：
Zhendong yu Chongji/Journal of Vibration and Shock | 2022年 / 41卷 / 14期
关键词：
concrete; dynamic property; energy absorption density; marine aggregate; static property; strain rate;
D O I：
10.13465/j.cnki.jvs.2022.14.031
中图分类号：
学科分类号：
摘要：
In order to investigate the dynamic properties of seawater-marine aggregate concrete, a separated Hopkinson pressure bar ( SHPB ) test facility was employed to conduct dynamic loading tests 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 amount of nine specimens was tested under static loading. The results show that the failure surface 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，and dynamic strength increase factor of fresh water-river sand-crushed stone concrete and seawater-marine aggregate concrete increase with the increase of strain rate. Under the same strain rate, seawater-sea sand-coral concrete has the largest dynamic peak stress and fresh water-river sand-crushed stone concrete has 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. The Comite Euro-International du Beton ( CEB ) -based predictive curve can basically reflect the relationship between the 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. © 2022 Chinese Vibration Engineering Society. All rights reserved.
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页码：233 / 242
页数：9
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