Strength Deterioration Mechanism of Interface between Soil–Rock Mixture and Concrete with Different Degrees of Roughness under Freeze–Thaw Cycles
Publication: Journal of Cold Regions Engineering
Volume 38, Issue 4
Abstract
The hydrothermal field status of soil–rock mixture–concrete interface changes significantly under freeze–thaw cycles, which causes pore structure changes, interface debonding, and cracking; therefore, the shear strength deteriorates and the safe operation of buildings in cold regions is affected. Indoor direct shear and nuclear magnetic resonance (NMR) tests and numerical simulations were conducted to explore the strength deterioration mechanism at the interface between the soil–rock mixture and concrete with different roughness degrees under freeze–thaw cycles in this study. The results suggest that freeze–thaw cycles have little effect on the rotation and displacement of particles, and roughness has a considerable effect. There are primarily three types of pores in the interface layer: (1) micropores; (2) mesopores; and (3) macropores. By increasing the number of freeze–thaw cycles, the T2 spectral peaks of the pore structures shifted to the upright side and the total T2 spectral area increases. The increase in the roughness degrees tends to increase the proportion of mesopores and enhances the interfacial strength. The results could benefit research on soil–rock and concrete interface systems and provide effective guidance for the construction, operation, and maintenance of pile foundation engineering in cold regions.
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Data Availability Statement
All data that support the findings of this study are available from the corresponding author upon reasonable request.
Acknowledgments
The research is funded by the National Natural Science Foundation of China (Nos. 42071100, 42271144, and 41971095), and the Project of Shaanxi Province Qinchuangyuan scientists and engineers team construction (No. 2022KXJ-086).
Author contributions: Liyun Tang: Conceptualization, writing – review and editing; Yiheng Li: Methodology, writing – original draft; Yongtang Yu: Software; Long Jin: Resources; Zhigang Gao: Investigation; Di Wu: Supervision; Qiang Sun: Validation; Hailiang Jia: Data curation; Tao Luo: Review.
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Published In
Journal of Cold Regions Engineering
Volume 38 • Issue 4 • December 2024
Copyright
© 2024 American Society of Civil Engineers.
History
Received: Aug 25, 2022
Accepted: Dec 21, 2023
Published online: Sep 2, 2024
Published in print: Dec 1, 2024
Discussion open until: Feb 2, 2025
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