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Bonding performance of polymer waterproof coating and expansive soil
Min Ma1,2, Benfu He2, Haijun Huang3
1School of Civil Engineering, Guangxi Polytechnic of Construction, Nanning, 530007, China.
Scientific Reports
|March 11, 2026
Summary
Polymer waterproof coating (PWC) bond strength in expansive soil is primarily influenced by soil density, then water content. Optimal PWC application requires high soil density and near-optimum water content for robust bonding.
Area of Science:
- Geotechnical Engineering
- Materials Science
Background:
- Expansive soils pose challenges in construction due to volume changes.
- Polymer waterproof coatings (PWC) are used to mitigate soil issues.
- Understanding PWC-soil bonding is crucial for infrastructure stability.
Purpose of the Study:
- Investigate bonding performance between PWC and expansive soil.
- Analyze the influence of soil water content, density, and PWC thickness on bond strength.
- Develop predictive models for bond strength in engineering applications.
Main Methods:
- Conducted 40 expansive soil pull-out tests.
- Varied soil water content (12-27%), soil density (1.6-2.0 g/cm³), and PWC thickness (0.8-1.5 mm).
- Systematically analyzed the effects of these parameters on bond strength.
Main Results:
- Soil density is the most significant factor (0.7010), followed by water content (0.2778).
- Bond strength increases with soil density and is maximized at 2.0 g/cm³.
- Bond strength exhibits a quadratic relationship with water content, peaking near 15.1%.
Conclusions:
- Recommended parameters for PWC application: soil density ≥ 1.8 g/cm³, water content near optimum, and PWC thickness of 1.5 mm.
- The 'soil-nail' effect of the pulled-out soil body enhances bonding.
- Findings provide a scientific basis for PWC use in expansive soil projects.
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