Experimental study on mechanical properties of precast cracked concrete under different cooling methods
Experimental study on mechanical properties of precast cracked concrete under different cooling methods
复制标题
不同冷却方式下预制开裂混凝土力学性能试验研究
DOI：
10.1016/j.conbuildmat.2021.124141
复制
发表时间：
2021-09
影响因子：
7.4
通讯作者：
Pengfei Liu
中科院分区：
文献类型：
--
作者：
Yu Zhao;Ding Ding;Jing Bi;Chaolin Wang;Pengfei Liu
为了研究高温后混凝土的力学性能和裂缝扩展规律，对预制裂缝角度不同的混凝土试件进行不同高温和不同冷却方式处理，然后进行单轴压缩试验。对经历不同高温的混凝土进行T2谱测试，以检测其孔隙变化。试验过程中采用声发射监测混凝土的破坏过程。通过扫描电镜和X射线衍射对损伤试件的成分进行分析，对比分析了应力-应变曲线、孔隙率变化与混凝土宏观和微观性能的关系。在本研究中，一定范围的高温显著提高了混凝土的单轴抗压强度。当温度高于一定值时，单轴抗压强度迅速下降。通过扫描电镜观察发现，经过高温和降温处理后，混凝土试件内部骨料与水泥的结合程度不同。高温和水冷对混凝土的破坏程度远远大于空冷。常温试件和高温处理后试件在测试过程中的声发射信号和能量释放有很大的不同。本文从细观和微观两个角度解释了混凝土开裂试件在高温和不同冷却方式处理后的力学现象。
In order to investigate the mechanical properties and crack propagation of concrete after high temperature, the concrete specimens with different angles of prefabricated cracks are treated with different high temperatures and different cooling methods and then subjected to uniaxial compression. The T2 spectrum is performed on the concrete that has experienced different high temperatures to detect its pore changes. Acoustic emission is used to monitor the destruction process of the concrete during the test. The composition of the damaged specimen by scanning electron microscope and X-ray diffraction are analyzed, then the relationship between the stress–strain curve, porosity change and macroscopic and microscopic properties of concrete are compared and analyzed. In this study, a certain range of high temperature significantly increased the uniaxial compressive strength of concrete. Then, the uniaxial compressive strength decreased rapidly when the temperature is higher than a certain level. It is observed that the bonding degree of concrete aggregate and cement inside the damaged specimen is different after high temperatures and cooling methods treated by using scanning electron microscope. The damage degree of concrete caused by high temperature and water cooling is far greater than that of air cooling. The acoustic emission signal and energy release between the normal temperature specimen and the specimen after high temperature treatment in the test process are quite different. This paper explains the mechanical phenomena of cracked concrete specimen after being treated with high temperature and different cooling methods from the microscopic and mesoscopic perspectives.
登录
查看更多内容
高温下钢筋混凝土十字形柱的抗震性能
影响因子：
5.5
作者：
Yuzhuo Wang;Tiangui Xu;Ziqing Liu;Guoqiang Li;Jian Jiang
通讯作者：
Jian Jiang
影响因子：
3.4
作者：
R. Izadifard;A. Khalighi;Mehrdad Abdi Moghadam;Hossein Balouei Pirnaeimi
通讯作者：
R. Izadifard;A. Khalighi;Mehrdad Abdi Moghadam;Hossein Balouei Pirnaeimi
含有两个缺陷的类岩石材料在单轴压缩下的开裂和应力应变行为
影响因子：
6.2
作者：
Zhao, Yanlin;Zhang, Lianyang;Tang, Jingzhou
通讯作者：
Tang, Jingzhou
DOI：
10.1016/j.ijheatmasstransfer.2016.03.033
发表时间：
2016-07-01
影响因子：
5.2
作者：
Ju, Yang;Liu, Jinhui;Ge, Zhishun
通讯作者：
Ge, Zhishun
影响因子：
11.4
作者：
Annerel, E.;Taerwe, L.
通讯作者：
Taerwe, L.