This project investigated the use of two types of thermoplastic pipes, High-Density Polyethylene (HDPE) and Poly-vinyl Chloride (PVC), as cross-drains under highways. Pipes ranging from 0.3 m (12 in.) to 1.5 m (60 in.) in diameter were evaluated under deep fills, minimum cover, and construction loads. In addition to a comprehensive literature review, an analytical study into the allowable fill heights for thermoplastic pipes and a field study to observe the installation and performance of the pipe in service conditions were conducted. Based on the study findings, recommendations regarding how and when thermoplastic pipe should be installed are provided.

1. Introduction
2. Objective and scope
3. Literature review
4. Analytical evaluation
5. Field Installation Evaluation
6. Summary and Conclusions
Acknowledgements
References

• Kang, Junsuk(Assistant Professor, Department of Civil Engineering and Construction Management, Georgia Southern University) | 강준석 Corresponding author
• James S. Davidson(Professor, Department of Civil Engineering, Auburn University)
• Lim, Jeong-Hyeon(Research Assistant, School of Civil, Environmental and Architectural Engineering, Korea University) | 임정현
• Kang, Young Jong(Professor, School of Civil, Environmental and Architectural Engineering, Korea University) | 강영종