Interesting to hear about additives and other things to introduce into
the mix!
I have to admit this is the first time I have ever heard of metakaolin
- I found some info here, but am hoping you can educate me a bit further:
http://en.wikipedia.org/wiki/Metakaolin
Sounds like it has to be heated, similarly to portland. Please teach
me more if you can...
similarly for perlite (which I have heard of but am not familiar with):
http://en.wikipedia.org/wiki/Perlite
Are you using expanded or non expanded perlite (might be a dumb
question, I dont know if both are event used). Sounds like expanded
perlite is heated as well... Sounds like perlite increases the
insulative properties? Can you tell me more about perlite?
Thanks!
Eli
--- In papercreters@yahoogroups.com, "clydetcurry" <clyde@...> wrote:
>
> I aggree with every thing you said - What we have been able to do , so
> far is to extend the portland 20% replacement by weight with
> metakaolin high reactivity pozzalon and then extend that mix by 600%
> with perlite aggregate- its cheap,dimensionally stable,eco freindly
> and fire resistant- and yes sir we still have a long way to go -
> apparently magnesium can be extracted from sea water, the problem
> seems to be that phosphate is the likely element to combine it with---
> In papercreters@yahoogroups.com, "mountainfair" <yahooposting@> wrote:
> >
> > I believe that the difference is that the CO2 that we exhale was taken
> > out of the atmosphere recently, and does not affect the carbon
> > balance, while the CO2 from fossil fuels has been in the ground for
> > millions of years and does affect the atmospheric balance of carbon
> > when released.
> >
> > Also, just as the straw bales and other materials may have been
> > trucked in from out of state, the portland cement you are using was
> > probably trucked in from fairly far away as well.
> >
> > There are some other factors stacked against portland cement - there
> > are currently large debates here in CO over concrete plants that are
> > burning tires in their kilns and releasing dioxins and other nasty
> > stuff that neighboring communities are not happy about.
> >
> > In some areas of the world the limestone used for making cement is
> > stripmined, displacing native people and destroying large amounts of
> > wildlife habitat. The same could be said for a lot of the coal that
> > is used as well, as well as drying up aquifers to transport the coal
> > in slurry form.
> >
> > With adobe and rammed earth, you would also have to ask what is the
> > footprint of running fossil fuel machinery to excavate, sift and mix
> > the dirt and hydraulically compress the earth. Unless, of course,
> > they are running the machinery on biodiesel.
> >
> > Apparently there are emerging alternatives:
> >
> > Carbon neutral concrete:
> >
> > http://www.ecocem.ie/
> >
> > and
> >
> > • ecocement – magnesium based replacement for ordinary (portland)
> > cement which soaks up (sequesters) carbon dioxide as it cures. A sharp
> > contrast to portland cement. Experts predict it will take 10 years for
> > this to be a feature in the market place. We aim to help this
> > innovation get over the market inertia and shrink this time frame.
> >
> >
> >
> >
> > --- In papercreters@yahoogroups.com, "clydetcurry" <clyde@> wrote:
> > >
> > > in other words- if we sit around debating for a year over the
fact we
> > > will exhale more CO2 than building our house would have produced-
> > > amazing- boy am I glad you folks have gotten around to this -
Clyde T.
> > > Curry--- In papercreters@yahoogroups.com, Greg House <ghunicycle@>
> > > wrote:
> > > >
> > > > My father worked in the cement and lime production industries most
> > > of his life. From what I've seen from his work, most cement
kilns are
> > > fired with coal.
> > > >
> > > > Greg
> > > >
> > > > ----- Original Message ----
> > > > From: Mikey Sklar <sklarm-yahoo@>
> > > > To: "papercreters@yahoogroups.com" <papercreters@yahoogroups.com>
> > > > Sent: Wednesday, August 8, 2007 10:32:47 AM
> > > > Subject: Re: [papercreters] Re: 26lbs of CO2 per bag of Portland
> > > >
> > > >
> > > >
> > > >
> > > >
> > > >
> > > >
> > > >
> > > >
> > > >
> > > >
> > > >
> > > >
> > > > When Portland cement is being made from limestone,
> > > natural gas or
> > > >
> > > > propane is used to heat the limestone. White portland would
have a
> > > >
> > > > even higher CO2 footprint as it is cooked longer.
> > > >
> > > >
> > > >
> > > > On Aug 8, 2007, at 9:21 AM, "slurryguy" <slurryguy@yahoo. com>
> wrote:
> > > >
> > > >
> > > >
> > > > > Does clinker outgas CO2 as it is getting fired? How much?
> > > >
> > > > >
> > > >
> > > > > I'm not disagreeing with your overall point. I actually agree.
> > > >
> > > > >
> > > >
> > > > > --- In papercreters@ yahoogroups. com, Mikey Sklar
> > <sklarm-yahoo@ ...>
> > > >
> > > > > wrote:
> > > >
> > > > >>
> > > >
> > > > >>
> > > >
> > > > >> I have been tormented by a few local adobe and straw bale
> builders
> > > >
> > > > >> for my use of Portland cement. They point out to me that by
using
> > > >
> > > > >> a high energy product that I am destructive to the
environment. I
> > > >
> > > > >> had my doubts and decided to run some numbers this evening
about
> > > >
> > > > >> just how much CO2 was being produced to create a bag of
portland.
> > > >
> > > > >> The answer I came to was less than 26lbs of CO2 per 94lb bag of
> > > >
> > > > >> portland. I suppose I can now point out to the so called green
> > > >
> > > > >> builders who are hauling straw bales or pre made adobes from
> across
> > > >
> > > > >> state boarders that their CO2 footprint is orders of magnitude
> > > >
> > > > > larger
> > > >
> > > > >> than my own.
> > > >
> > > > >>
> > > >
> > > > >> - portland cement 4,700,000 million btu per ton
> > > >
> > > > >>
> > > >
> > > > >> - convert btu's per ton to one bag of Portland (94lbs)
> > > >
> > > > >> * 1 ton 2000lbs
> > > >
> > > > >> * 2000 / 94 = 21.28
> > > >
> > > > >> * 4700000 / 21.28
> > > >
> > > > >> * 22,0864.66 btu's per bag
> > > >
> > > > >>
> > > >
> > > > >> - convert btu's of natural gas to pounds of CO2
> > > >
> > > > >> * 1 million BTUs (NG) will produce 117.08 pounds of CO2
> > > >
> > > > >>
> > > >
> > > > >> - convert btu's per ton of portland to pounds of CO2
> > > >
> > > > >> * 4,700,000 / 1,000,000 = 4.7
> > > >
> > > > >> * 4.7 * 117.08
> > > >
> > > > >> * 550.276 lbs of CO2 per ton of Portland made from Natural Gas
> > > >
> > > > >>
> > > >
> > > > >> - convert lbs of CO2 per ton of Portland to bag of Portland
> > > >
> > > > >> * 550.276 / 21.28
> > > >
> > > > >> * 25.86 lbs of CO2 per bag of Portland
> > > >
> > > > >>
> > > >
> > > > >> When we consider that jet fuel, diesel, and car fuel all
produce
> > > >
> > > > >> about 20 lbs of CO2 per gallon we can see that a bag of
Portland
> > > >
> > > > >> is producing the same amount of CO2 as driving 20 miles in your
> > > >
> > > > >> truck.
> > > >
> > > > >>
> > > >
> > > > >> If you want to bring yourself to neutral on CO2 for your
Portland
> > > >
> > > > >> usage. Consider that the average tree will absorb 26lbs of
> CO2 per
> > > >
> > > > >> year.
> > > >
> > > > >>
> > > >
> > > > >> Keep in mind that we humans on average exhale over 2lbs of
> CO2 per
> > > >
> > > > >> day.
> > > >
> > > > >>
> > > >
> > > > >
> > > >
> > > > >
> > > >
> > > > >
> > > >
> > > > >
> > > >
> > > > >
> > > >
> > > > > Yahoo! Groups Links
> > > >
> > > > >
> > > >
> > > > >
> > > >
> > > > >
> > > >
> > > > >
> > > >
> > > >
> > > >
> > > >
> > > >
> > > >
> > > >
> > > >
> > > >
> > > >
> > > >
> > > >
> > > > <!--
> > > >
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>
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> > > > #ygrp-sponsor #nc {
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> > > > #ygrp-sponsor .ad{
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> > > >
> > >
> >
>
font-family:Arial;font-weight:bold;color:#628c2a;font-size:100%;line-height:122%;}
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> > > >
> > > >
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> >
>
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