What you will have for sure, is a dust problem. When you crush limestone fine enough to use on our model railroads, you also create a lot of dust. You would have to thoroughly wash the product, then let it dry. If still dusty, repeat process. I used to work in the stone crushing business, but never wanted to use stone from our plant, due to trying to clean it before use.
Also, some limestone is so soft, that it will dissolve if you add water, say, as in securing the ballast.
Jeff
