[AT] Scrap iron

[Guy Fay]

Actually, a lot of civil engineering schools sponsor concrete canoe race 
teams- UW Madison holds the championship this year. They make some 
pretty exotic mixes, the stuff will float. The trick is to get the 
strength in there. Vermiculite is a common ingrediant.
GUy

Gene Waugh wrote:

>Mike,
>
>This won't help anything, but just as a point of interest... ALUMINUM is 
>heavier than concrete, but it's harder to fit tightly in a drum without a 
>lot of heat.
>
>George Willer
>-----------------------------------------------------
>
>Man, George, I sure just learned something!  I see that aluminum is about
>164 lbs/cu ft, and concrete is 90 - 125 lbs / cu ft.  Who woulda thunk it!!
>
>Thanks,
>
>Gene
>
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