Composite sleeper, also known as synthetic sleeper, is a type of railway sleeper made from continuous glass fiber-reinforced polyurethane foam material. It combines the characteristics of glass fiber-reinforced plastic composite and foam materials, offering advantages such as high strength, light weight, insulation, chemical resistance, and similarity to wood properties. Widely used in high-speed railways and subways, especially in situations where the use of concrete sleepers is limited.
● Strong support
Composite sleepers provide strong support, ensuring stability for railway tracks.
● Lightweight Design
Being lightweight makes handling, transportation, and installation more convenient.
● Insulation Properties
The material's insulation capabilities enhance safety by reducing electrical conductivity.
● Chemical Resistance
Composite sleepers resist chemicals, ensuring durability in various environmental conditions.
● Wood-Like Properties
Similar to wood, they allow for easy nailing and riveting during installation.
● Low Maintenance
Their durable nature translates to lower maintenance needs compared to traditional materials.
| Item | JIS E1203:2007 Strength | (CJ/T399-2012) GNEE Sleeper Strength |
|
| Material Strength | Bending Strength | min. 70 N/mm2 | min. 80 N/mm2 |
| Young 's modulus in flexure | min. 6000 N/mm2 | min. 7000 N/mm2 | |
| Withstand bending load | min. 170 kN | min. 170 kN | |
| Longitudinal compressive strength | min. 40 N/mm2 | min. 50 N/mm2 | |
| Shearing strength | min. 7 N/mm2 | min. 7 N/mm2 | |
| Adhesion shearing strength | min. 7 N/mm2 (base-material breakage) | min. 7 N/mm2 (base-material breakage) | |
| Electrical Properties | Alternating-current breakdown voltage | min. 20 kV | min. 20 kV |
| Direct-current insulation resistance | min. 1 X 1010 Ω | min. 1 X 1010 Ω | |
| Pulling Strength | Track spike pulling strength | min. 15 kN | min. 20 kN |
| Screw spike pulling strength | min. 30 kN | min. 40 kN | |
| Unit volume mass | 0.74土 0.1 g/cm3 | 0.74土 0.1 g/cm3 | |
| Amount of water absorption | max. 10 mg/cm2 | max. 10 mg/cm2 | |
Material Preparation ➔ Mixing ➔ Molding ➔ Curing ➔ Finishing ➔ Quality Control ➔ Packaging
