Dynamic split tests of UHPFRC discs and failure mechanism analysis based on <b>μ</b>XCT images

YAO Yong; YANG Zhenjun; ZHANG Xin; PANG Miao; LI Yaqi; YU Kelai

doi:10.11883/bzycj-2022-0243

Volume 43 Issue 5

May 2023

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Article Navigation > Explosion And Shock Waves > 2023 > 43(5): 053103

YAO Yong, YANG Zhenjun, ZHANG Xin, PANG Miao, LI Yaqi, YU Kelai. Dynamic split tests of UHPFRC discs and failure mechanism analysis based on μXCT images[J]. Explosion And Shock Waves, 2023, 43(5): 053103. doi: 10.11883/bzycj-2022-0243

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YAO Yong, YANG Zhenjun, ZHANG Xin, PANG Miao, LI Yaqi, YU Kelai. Dynamic split tests of UHPFRC discs and failure mechanism analysis based on μXCT images[J]. Explosion And Shock Waves, 2023, 43(5): 053103. doi: 10.11883/bzycj-2022-0243

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Dynamic split tests of UHPFRC discs and failure mechanism analysis based on μXCT images

doi: 10.11883/bzycj-2022-0243

1.
College of Engineering and Architecture, Zhejiang University, Hangzhou 310058, Zhejiang, China
2.
Hubei Provincial Key Laboratory of Geotechnical and Structural Safety, School of Civil Engineering, Wuhan University, Wuhan 433000, Hubei, China

Received Date: 2022-06-07
Rev Recd Date: 2022-12-06

Available Online: 2023-04-18

Publish Date: 2023-05-05

Abstract

Abstract

In order to better investigate the dynamic tensile properties and damage mechanism of ultra-high performance fibre reinforced concrete (UHPFRC), dynamic split tests with the strain rates of 1.72－7.42 s^-1 were carried out by a split Hopkinson pressure bar for UHPFRC discs with the fibre volume fractions of 0－3%. The surface crack propagation processes of the UHPFRC discs were captured by a high-speed camera and the images were analyzed by the digital image correlation (DIC) technique for strain evolution. Micro X-ray computed tomography (μXCT) scanning of the UHPFRC disc specimens before and after the dynamic tests was also conducted. The 3D images of the internal micro structures of the specimens with a voxel resolution of 56.7 μm were reconstructed, and they were then processed to statistically quantify the distribution, volume fractions and sizes of pores, fibres and cracks. Moreover, the dynamic failure mechanisms, such as pullout from the matrix, bending and breakage of steel fibres, crack propagation and merging in the mortar, etc., were visualized and analyzed. The main results obtained are as follows. (1) The addition of 1%－3% steel fibres raises the static and dynamic splitting strength by 84%－131% and 47%－87%, respectively. The dynamic increase factor (ratio of dynamic to static strength) is 1.07－1.72. (2) DIC images demonstrate that the fibres lead to more dispersed cracks, slower crack propagation, higher energy consumption and higher ductility. (3) The μXCT image analysis shows that the fibre volume fraction is 1.04%－2.47%, consistent with the designed proportion, while the porosity is 0.98%－1.71%. Fibres reduce the porosity and the number of pores, but increase their average volume and equivalent diameter. The increase of crack-bridging fibres reduces the volume and width of main cracks and raises the surface roughness and the relative surface area of cracks, resulting in the increase of strength, energy dissipation, toughness and ductility of specimens. The research data are useful for improvement of dynamic design guidelines and optimization for UHPFRC materials and structures.
- dynamic splitting,
- ultra-high performance fibre reinforced concrete,
- micro X-ray computed tomography,
- fracture mechanism,
- digital image correlation

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