Research on Crack Propagation Behavior of UHPC-NC Interface Under Stress Wave

LAI Haopeng; QIU Hao; LIAO Feiyu; QIU Huasheng; LIAN Fayan

doi:10.3724/j.gyjzG23083029

Volume 54 Issue 11

Nov. 2024

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LAI Haopeng, QIU Hao, LIAO Feiyu, QIU Huasheng, LIAN Fayan. Research on Crack Propagation Behavior of UHPC-NC Interface Under Stress Wave[J]. INDUSTRIAL CONSTRUCTION, 2024, 54(11): 95-102. doi: 10.3724/j.gyjzG23083029

Citation:

LAI Haopeng, QIU Hao, LIAO Feiyu, QIU Huasheng, LIAN Fayan. Research on Crack Propagation Behavior of UHPC-NC Interface Under Stress Wave[J]. INDUSTRIAL CONSTRUCTION, 2024, 54(11): 95-102. doi: 10.3724/j.gyjzG23083029

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Research on Crack Propagation Behavior of UHPC-NC Interface Under Stress Wave

doi: 10.3724/j.gyjzG23083029

1. College of Transportation and Civil Engineering, Fujian Agriculture and Forestry University, Fuzhou 350108, China;
2. Digital Fujian Intelligent Transportation Technology IOT Laboratory, Fujian Agriculture and Forestry University, Fuzhou 350108, China;
3. China Construction Fourth Engineering Division Corp. Ltd., Guangzhou 510665, China;
4. Fujian Tangtou Construction Engineering Group, Quanzhou 362500, China

Received Date: 2023-08-30
Available Online: 2024-12-05

Abstract

Abstract

For the ultra-high performance concrete (UHPC) overlaying normal concrete (NC) structures, the reliable interface performance between UHPC and NC is the foundation for achieving their good co-work behavior. The paper focused on the experimental and theoretical research on the crack propagation at the interface of these UHPC-NC configurations under stress waves. A bi-material notched semi-circle bent (BNSCB) configuration was proposed, and the impact tests were conducted on the BNSCB specimens using a split Hopkinson pressure bar system (SHPB), examining the differences in the interfacial impact performance between UHPC with different strengths and NC. Based on the finite element method and crack propagation gauge, the complex stress intensity factor (CSIF) at the crack tip of the interface of BNSCB specimen was calculated. The results showed that: 1) under stress wave action, interface cracks in the BNSCB specimens tended to propagate along the aggregate-cement matrix interface; 2) the maximum velocity of interface crack propagation in the BNSCB specimen did not exceed the Rayleigh wave velocity of UHPC; 3) the parameter K₂ at the crack tip of the BNSCB specimen was much smaller than K₁, and the parameter K₁ played a dominant role in crack initiation; 4) there was no obvious relations between the parameter K₂ in CSIF and UHPC strength grades.
- UHPC-NC interface,
- bi-material notched semi-circle bent specimen,
- split Hopkinson impact test,
- complex stress intensity factor,
- interfacial fracture

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References(19)

References

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