OT: Global Warming?

I may be a BOOB, but i do not see what you are talking about (somethig poked my eyes out..)

Nope. See "concrete outgassing". "Generally, concrete itself is inert. There has been talk about cement and concrete outgassing. Some people have theorized that concrete, during the curing process, traps chemicals other than carbon dioxide and water, that over time outgas or come out of the concrete. To date, this has not been proved. And even if true, I believe it?s extremely minimal. Concrete is like a two-component epoxy. When it sets up, it locks up. There is very little movement of anything going in or out of it, even on a theoretical level."

What does happen is that if you epoxy coat a contrete floor when it's cold, some of the trapped air in the cracks will be released when the floor warms up producing bubbles in the coating: Also, since concrete contains considerable amounts of water, if you heat concrete to above the boiling point, the water will turn to gas, and create a small explosion. That's why you don't want to be welding on a concrete floor.

--
Jeff Liebermann     jeffl@cruzio.com 
150 Felker St #D    http://www.LearnByDestroying.com 
Santa Cruz CA 95060 http://802.11junk.com 
Skype: JeffLiebermann     AE6KS    831-336-2558

You didn't read the text because you were distracted ?:-) ...Jim Thompson

-- | James E.Thompson | mens | | Analog Innovations | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | San Tan Valley, AZ 85142 Skype: Contacts Only | | | Voice:(480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at

| 1962 | I love to cook with wine. Sometimes I even put it in the food.

I think there is a lot of CO2 released when they make concrete.. (well the cement part.)

George H.

Bazookas on a par with the Motorola original, "The Silver Bullet" ;-) ...Jim Thompson

--
| James E.Thompson                                 |    mens     | 
| Analog Innovations                               |     et      | 
| Analog/Mixed-Signal ASIC's and Discrete Systems  |    manus    | 
| San Tan Valley, AZ 85142   Skype: Contacts Only  |             | 
| Voice:(480)460-2350  Fax: Available upon request |  Brass Rat  | 
| E-mail Icon at http://www.analog-innovations.com |    1962     | 
              
I love to cook with wine.     Sometimes I even put it in the food.

Text??? Was not distracted, was attracted!

If you're focusing on concrete outgassing, you're too old.

If you can't recognise silicone when you see it, you are too dim...

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Bill Sloman, Sydney

G > If you're focusing on concrete outgassing, you're too old. BS > If you can't recognise silicone when you see it, you are too dim... What makes you think they're not "natural", Slowman? Jealousy?

Nah, he has bigger ones.

No, a sense of proportion. A feature that you clearly lack.

--
Bill Sloman, Sydney

krw spends too much time with obese Americans. My BMI is 24. Jim Thompson might compete on pectoral volume, but probably couldn't manage the perkiness that properly packaged silicone can offer.

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Bill Sloman, Sydney

How can anyone get a good look at the concrete with those two in the way?

You can see enough of the concrete through the interstices. One lump of concrete looks very like another. Silicone ditto.

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Bill Sloman, Sydney

It's not the outgassing but the manufacture of cement that produces the CO2 . You add in some other factors, like the average formula proportion of cem ent to concrete, and you get about 400 lbs CO2 per cubic yard of concrete. A cubic yard is not much, and concrete is considered very non-green ( contr ibuting a full 5% to man generated carbon dioxide). The National Science Fo undation published a report establishing that the finished concrete does in fact re-absorb CO2 from the atmosphere but the highest reasonable estimate over something like 20 years is 5% of that 400 lbs or 20lbs. The industry knows it has a problem and, since there is absolutely no alternative to con crete in many large scale civil engineering projects, the research has turn ed to applying nanotechnology to the mix in the hope of producing concrete with radically improved structural characteristics and greatly improved lon gevity thereby requiring reduced maintenance and replacement. MIT is very b ig into this field.

[snip]

What concrete ?:-) I see tile. ...Jim Thompson

--
| James E.Thompson                                 |    mens     | 
| Analog Innovations                               |     et      | 
| Analog/Mixed-Signal ASIC's and Discrete Systems  |    manus    | 
| San Tan Valley, AZ 85142   Skype: Contacts Only  |             | 
| Voice:(480)460-2350  Fax: Available upon request |  Brass Rat  | 
| E-mail Icon at http://www.analog-innovations.com |    1962     | 
              
I love to cook with wine.     Sometimes I even put it in the food.

Thanks for the info. Looks like the CO2 is half from the chemical reaction and the other half from whatever is burned to produce the necessary heat.

One interesting effect is that by adding titanium dioxide to the mix, the concrete reduces smog:

--
Jeff Liebermann     jeffl@cruzio.com 
150 Felker St #D    http://www.LearnByDestroying.com 
Santa Cruz CA 95060 http://802.11junk.com 
Skype: JeffLiebermann     AE6KS    831-336-2558

Two? Mikek

G > If you're focusing on concrete outgassing, you're too old. BS > If you can't recognise silicone when you see it, you are too dim... G > What makes you think they're not "natural", Slowman? Jealousy? BS > No, a sense of proportion. A feature that you clearly lack. I look forward to your reference citations!