Steel slag has many properties which make it a viable alternative to the more commonly used crushed limestone.
Even relative to the hardest minerals, steel slag is a hard material, which makes it very durable.
The international standard measurement for hardness is the mohs hardness scale.
Steel Slag has a mohs hardness value of 6. In comparison, Granite has a mohs rating of 4, and Limestone has a mohs rating of 3.
Benefits of using Steel Slag vs Limestone