Monday, September 10, 2007

[papercreters] Re: Nick- Hollow PC

I agree that this is an interesting idea.

I'm not sure exactly what the original intent is, but I would not
consider packing the stone or gravel inside a papercrete wall in
hopes that the stone would bear a load. Putting a load on that
gravel will tend to cause it to act similarly to a fluid.
The "container" of a fluid must have the tensile strength to hold the
pressure of that fluid or it will fail. Papercrete does have a
little tensile strength, especially when the slurry is compressed,
but it doesn't have a lot.

This contrasts greatly with sandbags or tires. Both those items are
specifically designed to handle large tensile loads.

At the very least, test!!! Before trying to support a load with a
hollow papercrete wall filled with stone, please be sure failure
testing validates it can handle the expected loads.

If, however, it is not a load bearing wall, this may hold a thermal
mass. Whether it is the best way to hold a thermal mass in a
building depends upon what options are practical for the situation.


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