Anti-corrosion and deterioration performance of ECC-RC composite structure for shield tunnel segment under chloride attack

ZHAO De-bo; ZHANG Jie-wei; CUI Hong-zhi; BAO Xiao-hua; CHEN Xiang-sheng; CAO Cheng-yong; SHEN Jun

doi:10.19818/j.cnki.1671-1637.2025.03.010

Volume 25 Issue 3

Jun. 2025

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ZHAO De-bo, ZHANG Jie-wei, CUI Hong-zhi, BAO Xiao-hua, CHEN Xiang-sheng, CAO Cheng-yong, SHEN Jun. Anti-corrosion and deterioration performance of ECC-RC composite structure for shield tunnel segment under chloride attack[J]. Journal of Traffic and Transportation Engineering, 2025, 25(3): 160-177. doi: 10.19818/j.cnki.1671-1637.2025.03.010

Citation:

ZHAO De-bo, ZHANG Jie-wei, CUI Hong-zhi, BAO Xiao-hua, CHEN Xiang-sheng, CAO Cheng-yong, SHEN Jun. Anti-corrosion and deterioration performance of ECC-RC composite structure for shield tunnel segment under chloride attack[J]. Journal of Traffic and Transportation Engineering, 2025, 25(3): 160-177. doi: 10.19818/j.cnki.1671-1637.2025.03.010

Citation:

ZHAO De-bo, ZHANG Jie-wei, CUI Hong-zhi, BAO Xiao-hua, CHEN Xiang-sheng, CAO Cheng-yong, SHEN Jun. Anti-corrosion and deterioration performance of ECC-RC composite structure for shield tunnel segment under chloride attack[J]. Journal of Traffic and Transportation Engineering, 2025, 25(3): 160-177. doi: 10.19818/j.cnki.1671-1637.2025.03.010

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Anti-corrosion and deterioration performance of ECC-RC composite structure for shield tunnel segment under chloride attack

doi: 10.19818/j.cnki.1671-1637.2025.03.010

ZHAO De-bo^{1, 2, 3},
ZHANG Jie-wei^{1, 2, 3},
CUI Hong-zhi^{1, 2, 3},
BAO Xiao-hua^{1, 2, 3
,
,},
CHEN Xiang-sheng^{1, 2, 3},
CAO Cheng-yong^{1, 2, 3},
SHEN Jun^{1, 2, 3}

1.
State Key Laboratory of Intelligent Geotechnics and Tunnelling, Shenzhen University, Shenzhen 518060, Guangdong, China
2.
Key Laboratory of Coastal Urban Resilient Infrastructures, Shenzhen University, Shenzhen 518060, Guangdong, China
3.
College of Civil and Transportation Engineering, Shenzhen University, Shenzhen 518060, Guangdong, China

Funds:

National Key R&D Program of China 2021YFB2601000

National Natural Science Foundation of China 52178292

National Natural Science Foundation of China 52090084

More Information

Corresponding author: BAO Xiao-hua (1983-), female, professor, PhD, bxh@szu.edu.cn
Received Date: 2024-09-20
Accepted Date: 2025-03-12
Rev Recd Date: 2024-12-05
Publish Date: 2025-06-28

Abstract

Abstract

To boost the service performance of shield tunnel structure in an underground chloride environment, the engineered cementitious composite (ECC) with excellent cracking resistance were utilized to form an ECC-reinforced concrete (RC) composite structure for segments. The characteristics of single-sided chloride ion attack and sustained-loading coupling of the surrounding rock in the service environment of the tunnel were taken into consideration. A sustained-loading-accelerated corrosion testing apparatus and the eccentrically compressed specimens simulating the working state of the tunnel segment were designed. Electrochemical corrosion experiments and the tests of mechanical properties after corrosion deterioration were conducted on ECC-RC composite and conventional RC segment specimens. The corrosion deterioration rule and uneven corrosion characteristic of the steel bars of the two specimens were investigated at different sustained-loading levels. The mechanism of enhancing anti-corrosion deterioration performance with the ECC external layer was then revealed. Experimental results show that due to the dense structure and micro-cracking properties of the ECC layer, ECC-RC specimens are 6.8-7.2 times higher than conventional RC specimens in the applied voltage under the same current. The steel bar corrosion ratio of ECC-RC specimens is significantly lower than that of conventional RC specimens. It indicates that the shield tunnel segment with ECC-RC composite structure sees a significant increase in the anti-corrosion performance. Deteriorated ECC-RC specimens have higher loading capacity but smaller ultimate deflection than their RC counterparts with the same sustained-loading level. The sustained-loading level highly influences the corrosion deterioration patterns and bearing capacities of specimens. The ultimate bearing capacity of the deteriorated specimens is negatively correlated with the sustained-loading level at the corrosion stage. Compared with the ultimate bearing capacity of the non-deterioration specimens, when the loading capacity increases 1/10, the ultimate bearing capacity of RC tunnel segments drops by 2.6%, while that of ECC-RC composite tunnel segments decreases by 4.2%. The sustained-load steel bar in RC specimens presents significant uneven longitudinal corrosion. Pitting corrosion tends to occur at the location of cracks with sustained loading. The uneven corrosion becomes severer with the higher sustained-loading level. Due to the multiple micro-cracking mode of the ECC layer under sustained loading, the steel bar in ECC-RC specimens shows relatively uniform corrosion.
- tunnel engineering,
- ECC-RC composite structure,
- accelerated corrosion,
- lining segment,
- uneven corrosion,
- service performance

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References(38)

References

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Anti-corrosion and deterioration performance of ECC-RC composite structure for shield tunnel segment under chloride attack

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