American red oak, bug oak, holm oak, mose capped oak,
larch and any Russian red wood.
- Sectional dimension of sleepers shall be 2600*250*150mm
1. min density in 12% moisture: 0. 63~0. 58 gr / cm3
2. stiffness coefficient of the woo between 3 and 4
Compressive strength parallel to fibers / bending strength =
wood stiffness Coefficients moisture: 12%
Note: As for foreign wood species tests for determining
density in 12% moisture and also determining stiffness
coefficient of hardwood and its strength is obligatory.
3. composition coefficient of C. S. I.: 78
Wood strength against 12% moisture
Lumber strength against 12% moisture
C. S. I. = (S 10H) / 20
Min tensile strength of the wood in testing sleeper screw:
Bending strength parallel to fiber: 780~2460 KG / cm2
Tensile strength parallel to fiber: 1200~1350 KG / cm2
Percent of (mixed) stretching:
In axial direction 0. 3-0. 5
In radius direction 5-7: 4
In tangential direction 8. 3-11. 8
In volume direction 15-23
Standards of UIC codes 863 & 863-1.
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