摘要
为了研究冲击气压和礁灰岩粒径在冲击载荷下对珊瑚砂混凝土动态劈裂强度、能量耗散和分形维数等参数的影响,文中以不同粒径礁灰岩为粗骨料制作出珊瑚砂混凝土,利用分离式霍普金森压杆系统,并以不同的冲击气压对粒径不同的珊瑚砂混凝土试件进行高应变率动态劈裂力学试验。研究结果表明,珊瑚砂混凝土的动态劈裂强度随着冲击气压的增加而增加,礁灰岩粒径为16~20 mm时,试件劈裂强度最大;当礁灰岩粒径为5~10 mm时,不同冲击气压下的耗散能均为最小值,珊瑚砂混凝土抗冲击性能好;各实验组的破碎分形维数在2.2~2.6,小于普通混凝土,说明珊瑚砂混凝土较普通混凝土韧性和阻裂性能均有所提高,这对南海岛礁建设工程具有实际指导意义。
In order to study the effects of impact pressure and reef limestone particle size on the dynamic splitting strength,energy dissipation and fractal dimension of coral sand concrete under impact load.In this experiment,coral sand concrete was made from reef limestone with different particle sizes as coarse aggregates,and the dynamic spliting mechanical test of high strain rate was carried out on the coral sand concrete specimens with different particle sizes by using the separated Hopkinson pressure system and different impact pressures.The results show that the dynamic splitting strength of coral sand concrete increases with the increase of impact pressure,and the splitting strength of the specimen is the highest when the particle size of reef limestone is 16-20 mm.When the particle size of the reef limestone is 5-10 mm,the dissipation energy under different impact pressures is the minimum,and the impact resistance of coral sand concrete is good.The fractal dimension of crushing in each experimental group was between 2.2 and 2.6 compared with that of ordinary concrete,indicating that the toughness and crack resistance of coral sand concrete were improved compared with ordinary concrete,which has practical engineering guiding significance for the construction of islands and reefs in the South China Sea.
作者
柯健平
穆朝民
Ke Jianping;Mu Chaomin(School of Safety Science and Engineering Anhui University of Science Technology,Huainan,Anhui 232001;State Key Laboratory of Mining Response and Disaster Prevention and Control in Deep Coal Mines,Huainan,Anhui 232001)
出处
《江西建材》
2023年第10期8-13,共6页
Jiangxi Building Materials
基金
国家重点研发计划课题《单体洞室与洞室群局部分析与安全评价技术》(项目编号:2021YFC3100802)。
