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I bought a 12-ounce can from the dollar store...
I bought some plastic toolboxes from the dollar store...
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Good for you. I thought this would be about wood shavings.
What I took away from the videos that I watched was that it gets crumbly if the foam bubbles are too large. IIRC somewhere in the 5-10 micron range(?). Using shaving cream is a good kludge, maybe you can find out about what size the bubbles are.
Curing time isn't going to be hours. Concrete is stiff enough to walk in on 48 hours and continues to gain strength for a month. Eventually you will have some test samples.
Earlier today I was reading about carbon neutral/negative concrete:
CONCRETE THOUGHTS
The material that built the modern world is also destroying it. Here’s a fix
Yesterday it was:
https://en.wikipedia.org/wiki/Autoclaved_aerated_concrete
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When AAC is mixed and cast in forms, several chemical reactions take place that give AAC its light weight (20% of the weight of concrete) and thermal properties. Aluminum powder reacts with calcium hydroxide and water to form hydrogen. The hydrogen gas foams and doubles the volume of the raw mix creating gas bubbles up to 3mm (⅛ inch) in diameter. At the end of the foaming process, the hydrogen escapes into the atmosphere and is replaced by air.
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