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Study on Bonding Characteristics of Polymer Grouted Concrete-Soil Interface
Lina Wang1, Xiaodong Yang1, Yueliang Diao2
1School of Water Conservancy and Transportation, Zhengzhou University, Zhengzhou 450001, China.
Polymers
|August 10, 2024
Summary
A novel polymer grout effectively repairs concrete-soil interfaces, crucial for geotechnical engineering and diaphragm wall reinforcement. This material fills voids, chemically bonds soil particles, and enhances structural integrity under shear stress.
Area of Science:
- Geotechnical Engineering
- Materials Science
- Civil Engineering
Background:
- Interfacial shear damage is a major challenge for diaphragm walls and surrounding soils.
- Polymer grouting is a common repair method, but its use at concrete-soil interfaces is limited.
Purpose of the Study:
- To introduce a new polymer grouting material for reinforcing the concrete-soil interface.
- To investigate the bonding characteristics and shear damage mechanisms of the treated interface.
Main Methods:
- Direct shear tests were conducted to evaluate bonding and damage modes.
- Digital Image Correlation (DIC) technology was used to analyze the entire shear damage process.
- Scanning Electron Microscopy (SEM) was employed for microscopic analysis of soil structure.
Main Results:
- The polymer effectively fills soil pores and penetrates the concrete-soil interface.
- Chemical reactions with soil moisture create strong adhesion, reinforcing the interface.
- Increased normal stress reduced horizontal displacement and compressive strain, while decreasing maximum vertical displacement and strain in the cured soil.
- SEM confirmed significant reductions in soil porosity (52-59%) across tested polymers.
Conclusions:
- The developed polymer grouting material shows significant potential for repairing and reinforcing concrete-soil interfaces.
- The material's ability to chemically bond soil particles and reduce porosity enhances interfacial strength and stability.
- Findings support further research into diaphragm wall repair and reinforcement applications.
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