They're an odd shape and while strong, when you start cutting into anything made of fiberglas resins, you start ruining the thing that makes them strong - the matting they're made up from. You also could have problems from the materials themselves, are they made to be near animals? Outgassing, resin shards, etc.
It's industrial waste that's going to need a reprocessing scheme in order to be less of a problem than the coal it's trying to replace.
I completely agree with you about the coal and good points on off gassing. Just even the tip half would be alright for something as it looks like they're reenforced fairly well. Hell, I'd experiment making an earthship home out of them.
I'm sure that uses can be found for them, but we simply don't have any yet. Maybe using a section as reinforcement in concrete (aka the world's largest rebar) may be viable.
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