This study is to develop a composite material sleepers based on synthetic resin instead of neck sleepers applied to martial bridges. For this purpose, the properties of various polyols with various functional groups for the improvement of strength were evaluated, and the aim was to improve the physical properties by modifying isocyanate and expanding the reaction sites. The physical properties of polyurethane were evaluated according to the type and content of additive for the improvement of the physical strength of polyurethane

ABSTRACT
 1. 서 론
 2. 본문
 3 결론
 References

• 박상민(유원플렛폼) | Park Sang-Min
• 이준희(유원플렛폼) | Lee Jun-Hee
• 백인철(한국철도공사 융합기술연구처) | Back In-Chul
• 최해균(유원플렛폼) | Choi Hae-kyun
• 최영길(한국철도공사 융합기술연구처) | Choi Young-Gil
• 황철현(유원플렛폼) | Hwang Chul-Hyun