About Jalli (Blue Metal)
Jalli, also known as blue metal or crushed stone aggregate, is an essential component of concrete. It's produced by crushing hard granite rocks into specific sizes. The name "blue metal" comes from the bluish-grey color of crushed granite.
Uses of Jalli
- RCC Work: Essential ingredient in reinforced cement concrete
- Foundation: Provides strength to building foundations
- Slabs & Roofs: Used in roof slab concrete mix
- Columns & Beams: Structural concrete elements
- Road Construction: Base layer for roads
- Railway Ballast: Track bed material
20mm vs 40mm - Which to Use?
| Application | Recommended Size |
|---|---|
| RCC Slabs (residential) | 20mm |
| Columns & Beams | 20mm |
| Foundation (PCC) | 40mm |
| Footings | 40mm |
| Road Base | 40mm |
| Mass Concrete | 40mm |
Quality Specifications
- Material: Crushed granite stone
- Shape: Angular/cubical
- Impact Value: Less than 30%
- Water Absorption: Less than 2%
- Flakiness Index: Less than 25%