Materials & Required Properties of Ballast

Materials Used for Ballast

1. Broken stone
2. Gravel
3. Coarse sand
4. Brick bats
5. Selected earth

Required Properties

• Aggregate Abrasion Values: Maximum 30%
• Aggregate Impact Test: Maximum 20%
• Soundness: Maximum 10%
• Elongation Index: Maximum 50%
• Flakiness Index: Maximum 50%
• Specific Gravity: Minimum 2.65
• Water Absorption: Maximum 1%