Re: [papercreters] Re: Fireproof ratio question for papercrete

Clyde writes:  "I use perlite at a 4 to 1 ratio to cement as it gives a more solid
block"

More solid than what?   Is the ratio based on volume or weight?

 

"I use perlite as 50% of the total mix"

Again what is this based on and how does it relate to the above ratio?

 

"greater levels of cement and aggregate do not seem to affect the flow of heat until the material would be so dense as to conduct from particle to particle...Probally in excess of 80%"

Greater amounts of cement and aggregate will definitely decrease the R-factor.   What does 80% mean?

 

"-even with all the perlite I still dont get the strength I need till I have at least 3.5 sacks of cement?

Perlite will not give you strength, so that is to be expected, and that is not why it should be used.   Cement gives you strength, perlite gives you lightweight insulation and fireproofing.

 

curious that is also when I gain fire resistance-

Again it is to be expected that perlite gives fire resistance, and so does cement for that matter, so this makes no sense.   I will post a table of cement to perlite ratios today.

 

Neal 

 

-------------- Original message --------------
From: "clydetcurry" <clyde@evesgarden.org>

I use perlite at a 4 to 1 ratio to cement as it gives a more solid
block - I use perlite as 50% of the total mix - greater levels of
cement and aggregate do not seem to affect the flow of heat until the
material would be so dense as to conduct from particle to particle
Probally in excess of 80% -even with all the perlite I still dont get
the strength I need till I have at least 3.5 sacks of cement? yard -
curious that is also when I gain fire resistance- ever made an omelot
without eggs- use enough cement- Clyde--- In
papercreters@yahoogroups.com, sire@... wrote:
>
> It would be good to have a source for these numbers. I believe
Judith is using less cement than that in her latest fire test.
>
> I have been looking at Perlite instead/in addition to paper. If
fire prevention is your concern, perlite is the answer. You can use
6 to 8 cubic feet of perlite per 1 sa ck of cement, which is not only
easy on your pocketbook but kind to the environment. Also, the less
cement you use the greater insulation value you get.
>
> Neal
>
> -------------- Original message --------------
> From: "clydetcurry" <clyde@...>
> as a dry weight ratio a yard of finished papercrete requires at
least 85 lbs.of paper -fire resistance requires at least 3 1/2 sacks
of cement@ 94 lbs each or 330 lbs - so that is like 4 lbs sof cement
per 1 lb. of paper- not the other way around - folks are way to cheap
with the portland- carefull -Clyde---
> In papercreters@yahoogroups.com,
> "Ernie Phelps" <eepjr24@> wrote:
> >
> > --- In papercreters@yahoogroups.com, "gmkdart" <gkrautha@> wrote:
> > >
> > > However, I am co ncerned about flammability-- it seems the
general rule is a 4:1 mix of portland cement to paper. My question is,
are these dry weights?
> >
> > I would look at your source for the 4:1 ratio to answer that
question. Everyone on the list has slightly different mixes they use
in different situations. I don't need mine to be fireproof at the
moment, but I need it to stand up to weather. So I use about 3:1 wet
pulp to dry portland by volume. For fireproofing, I would probably be
inclined to up the inerts by adding lime, portland or sand.
> >
> > - Ernie
> >
>

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