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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>
>
>
>
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