Posted by Janicholson on July 07, 2019 at 06:44:41 from (199.17.6.141):
In Reply to: slag posted by randy1 on July 07, 2019 at 02:57:44:
I am a slag understander. Slag is the limestone and silicate residual material from the blast furnace smelting process of Iron or into pig iron. (also the weld cover on SMAW welds, but not being discussed) The slag is tapped into thermal gondola cars and dumped, cooled, and crushed. It contains multiple gaseous bubbles and inclusions. It is hard in places and bubbly soft in others. When crushed to 3/4", and the fines are left in it, it becomes a good road base. It will wear out in 8 to 10 years of driving on it, and needs periodic shaping to keep a crown, but as it breaks down, the fines create a solid non washing foundation. New layers on top get a bit squirrely at first unless they have substantial fines. It will soon settle down. When first applied, it may have a sulpherous smell. It is cheap. Works, and says put when settled in. Jim
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