摘要
利用自主研制的高温SHPB试验系统对混凝土进行冲击压缩试验,研究不同温度、不同应变率对混凝土冲击变形特性的影响。结果表明:温度相同时,混凝土应变率随冲击弹速的增大而增大,弹速相同时,应变率随温度的变化由大到小依次为200℃,800℃,600℃,常温,400℃;随着应变率的增大,混凝土峰值应变与冲击韧性在同一温度下不断提高,弹性模量在常温下显著降低,在高温下略有起伏;同一应变率下,温度越高,峰值应变越大,弹性模量越小,且冲击韧性在400℃之前逐渐增大,400℃之后开始下降,高温下混凝土冲击韧性的应变率效应较常温时有所提高。
The impact compression test of concrete was performed by using a self-developed high temperature split Hopkinson pressure bar （SHPB） testing system. The effects of different temperatures and different strain rates on impact deformation characteristics of concrete were investigated. The results show that the strain rate increases with increasing impact velocity at a fixed temperature, and the strain rate varies with temperature at a fixed impact velocity ranging from high to low as follow： 200 ℃, 800 ℃, 600 ℃, room temperature, 400 ℃. With the rising of strain rate, the peak ＇strain and impact toughness of concrete increase constantly at the same temperature, the elastic modulus decreases obviously at room temperature and changes slightly at high temperatures. Under the same strain rate, the higher the temperature, the larger the peak strain, the smaller the elastic modulus, and the impact toughness increases lower than 400 ℃ and decreases higher than 400 ℃. The strain rate sensitivity on impact toughness at high temperature is more distinct than that at room temperature.
出处
《硅酸盐通报》
CAS
CSCD
北大核心
2014年第5期1082-1087,共6页
Bulletin of the Chinese Ceramic Society
基金
国家自然科学基金资助项目(51378497
51208507)
关键词
混凝土
高温
分离式霍普金森压杆
冲击变形
concrete
high temperature
split hopkinson pressure bar （SHPB）
impact deformation
