Experimental study on bonding properties and deformation characteristics of polyurethane polymer mortar-concrete interface

Authors

Zhong-ming JIANG, School of Hydraulic and Environmental Engineering, Changsha University of Science & Technology, Changsha, Hunan 410114, China; Key Laboratory of Water-Sediment Sciences and Water Disaster Prevention of Hunan Province, Changsha University of Science & Technology, Changsha, Hunan 410114, ChinaFollow
Zhao-feng SHI, School of Hydraulic and Environmental Engineering, Changsha University of Science & Technology, Changsha, Hunan 410114, China
Xue YANG, School of Hydraulic and Environmental Engineering, Changsha University of Science & Technology, Changsha, Hunan 410114, China
Xiang TIAN, School of Civil Engineering, Changsha University of Science & Technology, Changsha, Hunan 410114, China
Zhe-zhen XIAO, School of Hydraulic and Environmental Engineering, Changsha University of Science & Technology, Changsha, Hunan 410114, China
Chen-zhi LIU, School of Hydraulic and Environmental Engineering, Changsha University of Science & Technology, Changsha, Hunan 410114, China
Xiang-yi HUANG, School of Hydraulic and Environmental Engineering, Changsha University of Science & Technology, Changsha, Hunan 410114, China

Abstract

Polymer mortar (PM) is recognized as a promising material for constructing the sealing layer of man-made caverns used in compressed air energy storage (CAES) systems, owing to its excellent airtightness, crack resistance, and deformation adaptability. This paper investigates the bonding properties and deformation adaptability of polyurethane polymer mortar (PPM) with lining concrete in man-made cavern gas storage, focusing on the effects of powder, polymer content, and mixture ratio variations on the PPM-concrete interface. Additionally, the failure characteristics and mechanisms of the interface are analyzed. The results indicate that the primary failure mode of the PPM-concrete interface is material separation on both sides. The relationship between interfacial shear stress and displacement exhibits two-stage approximate linear deformation characteristics prior to the stress peak, with a maximum shear strain of 11.05% during failure. Variations in powder and polymer content, as well as mixture ratio, significantly impact the interfacial bond strength. The maximum bond strength was about 1.21 MPa, while the lowest average bond strength was 0.237 MPa. The interfacial strength and deformability of the PPM-concrete interface satisfy the requirements for underground gas storage in CAES systems.

Recommended Citation

JIANG, Zhong-ming; SHI, Zhao-feng; YANG, Xue; TIAN, Xiang; XIAO, Zhe-zhen; LIU, Chen-zhi; and HUANG, Xiang-yi (2025) "Experimental study on bonding properties and deformation characteristics of polyurethane polymer mortar-concrete interface," Rock and Soil Mechanics: Vol. 45: Iss. 12, Article 3.
DOI: 10.16285/j.rsm.2024.5585
Available at: https://rocksoilmech.researchcommons.org/journal/vol45/iss12/3