__._,_.___----- Original Message -----From: slurryguySent: Wednesday, August 15, 2007 12:14 PMSubject: [papercreters] Re: Compressing SlurryIntersting idea.
I've often manually shaken a form to get a thick slurry to stettle.
My gut says vibrating a watery or spongy slurry won't help much, but
it is certainly worth testing the idea to find out for sure. My gut
instincts have been wrong before.
A good simple small scale experiment might be to vibrate the side of
a small form using a palm sander. Comparing that sample with one
that was not vibrated and with one that was compressed would be
educational. All samples would need to use the same recipe of course.
--- In papercreters@yahoogroups. , "Dan Nave" <Dan.Nave@..com .> wrote:
>
> Has anyone done any papercreting/testing with one of those vibrator
> probes that they use to get air voids out of concrete? When they
pour a
> large area like a dam, bridge footing, or roadways you often see
them
> insert a vibrating probe into it to get out the voids.
>
> This could have an impact on the shrinkage/form of the block after
> drying, the strength, water absorption, and the insulation value.
Maybe
> better, maybe worse, but I think it would be worth trying if anyone
has
> access to something like this.
>
> Dan
> _____________________ _________ ___
> Re: boric acid one more thing
> Posted by: "mdumiller" mdmiller1@... mdumiller
> Date: Sun Aug 12, 2007 1:35 pm ((PDT))
>
> I haven't tested this theory, but I think the amount of water
> reabsorption of cured papercrete is related to the amount of
original
> water in the mix as poured/used. As the water evaporates from
curing
> PC, creating airspace voids in the pC, rewetting will tend to
permit
> water back into these itsy spaces. The fibers are probably encased
> in portland and don't absorb much, which is why a block that is
> rewetted dries so quickly.
>
> I'm guessing that if you took two identical just-poured pc blocks
and
> squeezed all the water out of one of them and let them both dry,
the
> one with the water squeezed out is smaller and of higher density
and
> probably won't absorb as much water. It contains less air space,
> even though they both contain the same amount of paper and other
> material.
>
> On the other hand, if you don't put in enough portland to coat the
> fiber, then the paper fibers themselves will saturate and become
part
> of the equation, and in this case, I think you're right.
>
> In situations where you expect to have PC exposed to a lot of
> moisture, based on this theory, it would be wise to compress the
> blocks while wet to eliminate water. Obviously this could impact
the
> insulative properties of the finished product. And this is just a
> theory, so don't do anything based on this untested crazy idea.
>
>
> Compressing Slurry -was- Insulation Value
> Posted by: "slurryguy" slurryguy@... slurryguy
> Date: Mon Aug 13, 2007 12:21 pm ((PDT))
>
> Compressing slurry can take many forms. Following are a few
ideas.
> NONE OF WHICH I'VE TRIED AT A PRODUCTION SCALE. I've played with
all
> these concepts successfully on a SMALL SCALE. Experiment all you
> want at your own risk. Be careful out there gang.
>
> Compressing slurry to make blocks might be easiest. I envision a
> contraption similar to the Cinva system for making compressed earth
> or adobe blocks. Imagine if a cinva were built using a perforated
> box? Water could easily drain out as the block is getting
> compressed. Think of a big industrial strength potato ricer!
(btw,
> a regular potato ricer works really well for small scale
> experiments. Make sure you clean it before returning it to the
> kitchen or incur the wrath of the family cook!!! slurryguy claims
no
> responsibility for injuries resulting from flying cookware thrown
by
> angry cooks.) Several hundred psi seems reasonable in a block
> press. It would also be easy to reclaim the water draining out of
a
> press and recycle it back into the next batch of slurry.
>
> Compressing slurry in a block making slipform like Judith uses
might
> be as simple as laying some lumber across the top of the form just
> covering the slurry, but not overlapping the form. The vehicle
> towing the mixer might be driven over the top after some initial
> draining, thereby compressing the mix into the form. I wonder if
the
> slurry might try to ooze out from under the sides of such a form,
so
> I'm not certain if this would work well. If someone tries it,
please
> be careful to not damage your vehicle. This concept may need to
have
> some bugs worked out to make it work.
>
> Compressing slurry while slipforming would be more difficult, but
> still could be done. Imagine someone were using a wall system
> similar to the diagram posted in the photos section for a bailing
> twine reinforced wall. With each lift of slurry poured into the
> slipform, a box beam could be laid across the top of the slurry so
> that it nests inside the slipform. Long strap clamps could be
looped
> over the wall and attached to the rebar staples embedded in the
> foundation as shown in the diagram. The box beam would obviously
be
> removed before the next lift of slurry were poured.
>
> Cast in place walls could be compressed in a similar manner to that
> described for slipforming.
>
> I cannot think of a good method to compress sprayed slurry. The
> variables about the shape and location of the potential surfaces
are
> too many to wrap my feeble brain around.
>
>
> --- In papercreters@yahoogroups. , <bob@> wrote:com
> >
> > Good thinking- I like the thought process. If your form has a
> trough on top
> > with a water repellent barrier- then you could use water to
> compress the
> > slurry-more water more compression. What is water about 8 pounds
to
> the
> > gallon? Bob C
> >
>
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