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#53 slag, also known as #53 steel slag, dense-graded slag, slag road base, or compactable slag aggregate, is a heavy-duty blend of processed steel slag ranging from larger stone down to fine particles. It is commonly produced as approximately 1 1/2-inch-minus material, although exact gradation may vary by supplier and regional specification.
The combination of coarse aggregate and fines allows #53 slag to compact into a dense, firm, and highly stable foundation. Larger particles provide strong load-bearing support, while the finer material fills the spaces between the stone and helps the blend lock together under pressure. When properly graded and mechanically compacted, it creates a durable base that resists rutting, shifting, and settlement under repeated traffic and heavy equipment loads.
#53 slag is widely used in roadway, industrial, commercial, and site-development projects because of its density, toughness, and long-term structural performance. Its rough, angular texture promotes strong interlock, making it a dependable choice beneath asphalt, concrete, gravel surfaces, driveways, parking areas, and other high-traffic improvements.
Common Applications of #53 Slag
- Road base and highway construction
- Driveway and access-road base preparation
- Parking lots and high-traffic areas
- Base layer beneath asphalt or concrete
- Construction entrances and haul routes
- Heavy-equipment yards and staging areas
- Site grading and structural stabilization
- Industrial and commercial pavement projects
