Posted by Mark - IN. on September 10, 2014 at 17:01:27 from (73.51.22.90):
In Reply to: Fly ash? posted by Notjustair on September 09, 2014 at 20:18:44:
Fly ash leaves the coal fired power plants in huge bulk semis pretty much non-stop. Its the ash left over from burnt coal. You won't be getting it long though. The power plants used to get paid by concrete companies for it that used it as hardener when mixed with the concrete. Problem is that a couple of years ago the EPA defined it as hazardous waste, so now the power plants have to pay to have it removed, and I'm not certain that concrete companies can even use it anymore. Of the six coal fired plants near me, two have been shut down and completely dismantled, three of four units of another have been shut down and the fourth shutting down in a year. Two are having their three combined units converted to gas, and only one is staying coal fired because its on Lake Michigan. The EPA is forcing them out of business, so your chances of getting fly ash is diminishing with our power sources.
About a decade ago I had to replace a phone cable that was the only cable inside a 1" rigid conduit at one of the plants. Problem is that over the decades, fly ash had filled it mixed with pigeon crap since the pigeons roosted over it, along with rain water. It packed shut for about 10'. I took me about 8 hours to make it through. Fly ash mixed with pigeon crap and rain water and then allowed to dry and harden might be harder than concrete.
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