Crack evolution mechanism and CT scale damage characteristics in concrete under hydraulic impacting

被引：0

作者：

Liu J. ^{[1
,2
,3
]}

Zhang D. ^{[1
]}

Wang M. ^{[1
]}

机构：

[1] School of Civil Engineering, Chongqing Jiaotong University, Chongqing

[2] State and Local Joint Engineering Lab of Traffic Civil Engineering Materials, Chongqing Jiaotong University, Chongqing

[3] MOE Engineering Research Center of Bridge Structure and Materials in Mountain Area, Chongqing Jiaotong University, Chongqing

来源：

Zhendong yu Chongji/Journal of Vibration and Shock | 2019年 / 38卷 / 11期

关键词：

Computer tomography (CT) scanning; Concrete; Crack; Damage; Hydraulic impacting;

D O I：

10.13465/j.cnki.jvs.2019.11.011

中图分类号：

学科分类号：

摘要：

Using the CT scanning technology, concrete's meso fracture state was detected in all directions under hydraulic impacting. The mechanical processes of "V" shaped taper crushing core, surface cracks and circumferential cracks in concrete under hydraulic impacting were illustrated based on the CT scanning results and the liquid-solid collision theory. Then concrete failure mechanisms under hydraulic impacting in stages of cracking, expanding, and rupturing were explored and 5 typical hydraulic impact induced cracks evolution characteristics and mechanical mechanisms were revealed. Furthermore, the CT scanning images were processed with the histogram equalization and the threshold segmentation. A damage characterization method based on image gray value was proposed to study the CT scale damage distribution characteristics in concrete under hydraulic impacting. It was quantitatively shown that strong hydraulic impacting can cause obvious damage in aggregate and mortar basic transition zone of the unbroken area in concrete; the closer the distance to induced cracks, the more serious the damage deterioration degree. © 2019, Editorial Office of Journal of Vibration and Shock. All right reserved.

引用

页码：68 / 74

页数：6

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