Application of high-strength ECC in the repair and reinforcement of deep vertical shaft lining

被引：0

作者：

Cai, Haibing ^{[1
]}

Zang, Long ^{[1
]}

Hu, Shi ^{[1
]}

Li, Xiaofang ^{[2
]}

Pang, Changqiang ^{[1
]}

Wu, Qianqian ^{[2
]}

机构：

[1] School of Civil Engineering and Architecture, Anhui University of Science and Technology, No.168 Taifeng Street, Shannan New District, Anhui, Huainan

[2] School of Urban Construction, Anhui Wenda University of Information Engineering, Hefei

来源：

Journal of Engineering and Applied Science | 2024年 / 71卷 / 01期

关键词：

High-strength ECC; Impermeability; Microstructure; Orthogonal test; Shaft lining remediation;

D O I：

10.1186/s44147-024-00558-9

中图分类号：

学科分类号：

摘要：

In this paper, river sand, fly ash, modified desulfurization gypsum, an expansion agent, and a water-reducing agent are incorporated into an engineered cementitious composite (ECC) to study the physical and mechanical properties and impermeability of the ECC. The mechanism of PVA fibers is also analyzed. Fiber grating sensing technology is used to monitor the shaft lining in real-time and assess its engineering application effectiveness. The results show that the optimal mix ratio of high-strength ECC is 20% silica fume, 4% desulfurization gypsum, 6% expansion agent, and 1.9% water-reducing agent. When the compressive strength of the ECC exceeds 60 MPa, the ultimate tensile strain reaches 2.84%, the ultimate bending strength reaches 14.06 MPa, and the impermeability grade reaches P8, indicating good flow performance. These properties meet the requirements of actual engineering for ECC strength and durability. The long-term monitoring results of the shaft lining concrete strain are significantly below the early warning value, indicating that shaft lining repair and reinforcement are effective. This study provides a research basis for the application of ECC in shaft lining repair engineering. © The Author(s) 2024.

引用

共 40 条

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