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INDOT #9 slag, also known as #9 steel slag, INDOT slag aggregate, fine slag stone, or specification-grade slag, is a small, angular aggregate produced from processed steel slag to meet applicable Indiana Department of Transportation requirements. It is a finely graded material intended for projects that need consistent sizing, smooth placement, and dependable surface stability.
Its hard, fractured particles spread evenly and settle together more securely than rounded gravel, helping create a firm, uniform layer with strong resistance to wear. The smaller aggregate size also makes INDOT #9 slag easy to place around pavers, pavement edges, utility trenches, and other areas where accurate grading and a refined finish are important.
INDOT #9 slag is widely used in roadway, commercial, industrial, and hardscape construction because it combines the workability of fine aggregate with the strength and durability of processed steel slag. It performs well in leveling, surface finishing, aggregate mixes, and light-duty construction applications that require specification-grade material and consistent performance.
Common Applications of INDOT #9 Slag
- Leveling beneath pavers, patios, and walkways
- Fine aggregate in concrete and asphalt mixes
- Surface finishing over compacted aggregate base
- Utility trench bedding and finishing layers
- Driveway and access-area top dressing
- Hardscape and pavement-edge preparation
- Fine grading around structures and utilities
- Municipal and infrastructure construction projects
