I'm a people!
Person?
By the way, I was trying to figure out how to make concrete from facial hair, but I realized I needed to cut it off first.
Pity. Lappy is not letting me attach the picture of Aircrete floating in water.
Here:
https://youtu.be/aSLJCPR1Prw?t=11m47s
Build a bridge out of it!
Blowtorch:
https://youtu.be/aSLJCPR1Prw?t=12m25s
Dome Gaia says it is rated to 300 PSI, but concrete is far stronger than that.