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INDOT #11 slag, also known as #11 steel slag, INDOT fine slag aggregate, or specification-grade slag stone, is a small, angular aggregate produced from processed steel slag to meet Indiana Department of Transportation gradation and quality requirements. Its controlled particle distribution provides consistent placement, dependable interlock, and long-lasting durability for paving, utility, and construction applications. INDOT classifies #11 as a coarse-graded aggregate rather than a dense-graded material, so it should not be described as a fines-heavy compactable base.
The hard, fractured particles settle securely and resist wear under traffic and changing site conditions. Its smaller size makes the material easy to spread around pipes, pavement layers, trenches, and confined work areas while supporting water movement through the aggregate.
INDOT #11 slag is commonly selected for specification-driven projects that require a durable, consistently graded aggregate with the strength and toughness of processed steel slag. It performs well in asphalt and concrete mixes, utility installations, surface layers, and other applications where accurate placement and dependable performance are important.
Common Applications of INDOT #11 Slag
- Asphalt and concrete aggregate mixes
- Pipe bedding and utility trench support
- Surface finishing over compacted aggregate base
- Pavement and roadway construction
- Drainage layers around utilities and structures
- Driveway and access-area top dressing
- Fine grading around construction features
- Municipal and infrastructure projects
