Crack detection for wading-concrete structures using water irrigation and electric heating

doi:10.1007/s11709-022-0926-x

Front. Struct. Civ. Eng.

2023, Vol. 17

Issue (3) : 368-377 https://doi.org/10.1007/s11709-022-0926-x

RESEARCH ARTICLE

Crack detection for wading-concrete structures using water irrigation and electric heating

Jiang CHEN^1,^2,³, Zizhen ZENG³, Ying LUO³, Feng XIONG^1,^2,³, Fei CHENG⁴(

)

¹. Failure Mechanics and Engineering Disaster Prevention Key Laboratory of Sichuan Province, Sichuan University, Chengdu 610065, China
². MOE Key Laboratory of Deep Earth Science and Engineering, Sichuan University, Chengdu 610065, China
³. College of Architecture and Environment, Sichuan University, Chengdu 610065, China
⁴. College of Biomass Science and Engineering, Sichuan University, Chengdu 610065, China

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Abstract

Cracking in wading-concrete structures has a worse impact on structural safety compared with conventional concrete structures. The accurate and timely monitoring of crack development plays a significant role in the safety of wading-concrete engineering. The heat-transfer rate near a crack is related to the flow velocity of the fluid in the crack. Based on this, a novel crack-identification method for underwater concrete structures is presented. This method uses water irrigation to generate seepage at the interface of a crack; then, the heat-dissipation rate in the crack area will increase because of the convective heat-transfer effect near the crack. Crack information can be identified by monitoring the cooling law and leakage flow near cracks. The proposed mobile crack-monitoring system consists of a heating system, temperature-measurement system, and irrigation system. A series of tests was conducted on a reinforced-concrete beam using this system. The crack-discrimination index ψ was defined, according to the subsection characteristics of the heat-source cooling curve. The effects of the crack width, leakage flow, and relative positions of the heat source and crack on ψ were studied. The results showed that the distribution characteristics of ψ along the monitoring line could accurately locate the crack, but not quantify the crack width. However, the leakage flow is sensitive to the crack width and can be used to identify it.

Keywords structural health monitoring underwater concrete structure fiber Bragg grating crack detection temperature tracer method

Corresponding Author(s): Fei CHENG

Just Accepted Date: 25 December 2022 Online First Date: 07 April 2023 Issue Date: 24 May 2023

Cite this article:

Jiang CHEN,Zizhen ZENG,Ying LUO, et al. Crack detection for wading-concrete structures using water irrigation and electric heating[J]. Front. Struct. Civ. Eng., 2023, 17(3): 368-377.

URL:

https://academic.hep.com.cn/fsce/EN/10.1007/s11709-022-0926-x
https://academic.hep.com.cn/fsce/EN/Y2023/V17/I3/368

Fig.1 Scheme of a crack-monitoring system for underwater concrete structures: (a) uncracked; (b) cracked.

Fig.2 Scheme of the implementation of a constant-level water tank.

Fig.3 Sketch of the thermal effect near a crack.

Fig.4 Sketch of test specimen.

Fig.5 Test site in still water.

Fig.6 Sectional view of sensing-heating element.

Fig.7 Layout of measuring points.

Fig.8 Semilogarithmic graph of time–history curves of Γ.

Fig.9 Test site in flowing water.

Fig.10 Comparison of the time–history curves of lgΓ in still water and flowing water.

Fig.11 Distribution of ψ with different crack widths and leakage flows: (a) w = 0.2 mm; (b) w = 0.4 mm; (c) w = 0.6 mm; (d) w = 1.0 mm; (e) w = 1.6 mm.

Fig.12 Distribution of ψ under different crack widths and leakage flows.

Fig.13 Relationship between q_w and ψ for measuring point #5.

Fig.14 Relationship between ψ and w for measuring point #5.

Fig.15 Relationship between q_w and w.

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