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Q(t)=ṁCpΔT
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What is this? I might be building a shed soon.
Neighbor works for a company that builds large transmission lines. He said they use foam now rather than concrete in many cases. It's as strong as concrete in this situation, meaning stronger than surrounding soil which is all it really has to be. It penetrates cracks and fissures much better and when set up will hold as good or better than concrete. Keep in mind that these poles are usually set over 10' deep, so it's providing stability more than structural strength. It sets HARD, you aren't going to dig it out with a screwdriver unless it's accompanied by a hammer.
They actually use it now in mud-jacking of foundations. They have to be careful with the mix and know just how much to put in but it actually lifts the slab where grout/concrete doesn't. It also doesn't degrade over time unless exposed to sunlight.
Don't doubt the power of a chemical reaction, which is what happens when this stuff expands. Gunpowder is another impressive reaction that most of us enjoy from time to time.
 

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Smart Ass Conservative
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