Quote:
Originally Posted by redpoint5
Things should be made strong enough, and no stronger, otherwise it is waste.
I'm not thinking open cell, as that would be a disaster. Just wondering if twice as much sidewalk could be poured for the same amount of concrete.
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I don think so:
You are replacing sand with air. (bubbles)
Or one filler with another.
(Doing so negates the acquisition and transport cost of sand.
vs
Xanthan and dishwasher liquid.
I wonder what the maths looks like?)
I AM thinking open cell!

Imagine roads without standing water!
But now we're thinking: "What else can one add to make it (tensiley) stronger?"
Or
to open cell it when the bubbles are still tiny?
(Mattress foam is 'opened' by exploding hydrogen on one side)