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INDOT #5 slag, also known as #5 steel slag, INDOT slag base, dense-graded slag aggregate, or specification-grade steel slag, is a compactable blend of crushed steel slag, smaller particles, and fines produced to meet applicable Indiana Department of Transportation requirements. It is commonly graded from approximately 1 inch down to fine material, creating a balanced mix that supports tight compaction and strong load-bearing performance.
The larger slag particles provide structural strength, while the smaller material fills the spaces between them and helps the aggregate lock together under pressure. When properly placed, graded, and mechanically compacted, INDOT #5 slag forms a dense, firm foundation that resists shifting, rutting, and settlement under repeated traffic and heavy equipment loads.
INDOT #5 slag is widely used in roadway, industrial, commercial, and infrastructure construction because it combines consistent gradation with the density, toughness, and wear resistance of processed steel slag. It performs especially well in structural base and sub-base applications where long-term stability, dependable compaction, and specification-grade performance are required.
Common Applications of INDOT #5 Slag
- Driveway and access-road base construction
- Road base and sub-base preparation
- Structural fill and site stabilization
- Heavy-duty pads and equipment areas
- Construction entrances and haul routes
- Parking lot and industrial yard preparation
- Base beneath asphalt or concrete pavement
- Municipal and infrastructure construction projects
