Tuesday, May 20, 2008

[papercreters] Re: Thought

--- In papercreters@yahoogroups.com, Lawrence Arnold <larystoy@...> wrote:
> Will the block eventually dry to the 16 1/2 pounds of inert
> materials?

Not likely, unless you put it into a kiln and cook the heck out of it.
Even kiln dried hard woods maintain 7 or 8 percent water. Green wood
is 50 to 100 percent moisture content (depending on the area, type of
wood, etc). Also, the concrete bonds with some of the water, holding
something in the neighborhood of 15% water by volume, if I remember right.

I would expect protected papercrete (ie inside a humidity controlled
environment such as a house) to end up with a moisture content of
10-12 percent, roughly equivalent of cured wood, over the long term.
That would put your final weight at something close to 18.5 pounds at
final weight. You are at about twice that at the moment (~24%).

Remember, all these numbers can be radically affected by the humidity,
direct exposure to water or other moisture, the types of fiber used,
type of cement, etc. And I am no chemistry major, so all figures are
approximate. =P

- Ernie


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