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Re: Concrete
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Posted by Matt Clark on July 23, 2004 at 13:47:39 from (12.30.136.108):
In Reply to: Concrete posted by tlak on July 23, 2004 at 06:03:06:
I ain't being a smarta**, but portland is "made", not mined. Using cement kiln, they add lime, some metals and a bunch of other stuff, heat it under open flame to about 1800 F, and it comes out in round balls (clinkers) which are then milled into powder or cement. It doesn't take many people to run a kiln, but they can only make so much. There's no such thing as running slow or fast...they just run and continuously. Many now burn waste oils and hazardous wastes (solvents, paints, etc.) which is a really cheap fuel for them, and helps the waste disposal industry by making a home for stuff that otherwise would be pretty expensive to dispose of. I just toured a cement kiln in Ohio a few month ago, and it's quite an operation...huge!! We were looking to them as a resource to burn scrap tires (which are really beneficial to their process) but they tell me they hardly buy any coal or gas anymore, but instead others pay to have their wastes burned. Capacity hasn't changed, but their market has expanded dramatically overseas, and they've contracted a lot of their production for several months. Thus the "shortage" here...
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The 8N and the Fox - by Zane Sherman. Dec. 13 1998, Renfroe, Alabama. Last niht I dreamed about the day that I plowed the field of about 10 acres over on what Jimmy and Dandy called the Ledbetter field. I was driving the 1948 8N Ford tractor that Jimmy bought in 48 new This was prebably in about 1951 and maybe even befor the house was built. This would have made me to be about16 years old and I drove the tractor for nothing and would have paid to drive it if I had had any money which I didn't, but neit
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