I cant speak for all slag but being from Pittsburgh there are many slag driveways near my house that have been there for years. All the old timers say that the blast furnace slag was the best because it is real jagged and locks together with very little compaction. Check this link it has a few descriptions of different types. This company is near my house if i look out my upstairs window i see a slag pile 10 stories high. Home Page
Hope this helps,
Mike
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