摘要
为研究塑性混凝土抗压强度与损伤特征随浸水时间的变化规律,对4组不同浸水时长条件下的塑性混凝土样品进行了单轴压缩试验与声发射信号测试,根据塑性混凝土受压损伤时所释放的声发射信号定量探讨了细观结构的损伤规律。结果表明,塑性混凝土的应力-应变曲线可分为弹性变形、塑性屈服、断裂破坏和残余变形4个变形阶段;随浸水时长增加,混凝土抗压强度与弹性模量逐渐递减,声发射信号峰值增加;塑性混凝土的声发射信号累积值与细观结构损伤程度的演化规律较为同步,CT图像从细观损伤的角度验证了试验的有效性。
In order to study the change law of strength and damage characteristics of plastic concrete with soaking time,uniaxial compression and acoustic emission monitoring tests were carried out on four groups of concrete under different soaking time conditions.According to the acoustic emission signals released by plastic concrete samples when they were damaged by compression,the degree of structural damage was quantitatively discussed.The results show that the stress-strain curve of concrete can be divided into four deformation stages:elastic deformation,plastic deformation,fracture failure and residual deformation.With the increase of immersion time,the strength and elastic modulus of concrete decrease gradually,and the peak value of acoustic emission signal increases.The change characteristics of acoustic emission signal accumulation value are synchronized with the evolution law of concrete structure damage,which verifies the validity of the experiment from the perspective of mesoscopic damage.
作者
王丹净
WANG Dan-jing(School of Mechanics and Civil Engineering,China University of Mining and Technology,Xuzhou 221000,China;School of Art and Design,Wuxi Vocational and Technical College of Commerce,Wuxi 214000,China)
出处
《水电能源科学》
北大核心
2021年第12期156-159,共4页
Water Resources and Power
基金
国家重点研发计划(2017YFC500702)
国家自然科学基金项目(51678563)
江苏省高等职业院校专业带头人高端研修资助项目(2020GRFX089)。
关键词
塑性混凝土
声发射
浸水时间
应力应变
损伤特征
细观结构
plastic concrete
acoustic emission
soaking time
stress strain
damage characteristics
mesoscopic structure
