[PSUBS-MAILIST] concrete

[Marc de Piolenc]

Is that yield strength compression only, or tension and compression? If 
the latter, it is optimistic. The great weakness of un-reinforced 
Portland cement concrete is of course poor tensile strength. The 
stiffness, on the other hand, is high, and accounts for good structural 
stability in concrete structures due to buckling resistance.

If it were possible to guarantee pure and consistent compressive 
stressing, then even sidewalk-grade concrete, with no steel, could be 
used at very great depths.

Marc

On 4/12/2014 10:34 AM, Sean T. Stevenson wrote:
> Hank,
>
> There are countless varieties of concrete, all with different mechanical
> properties, so it is difficult to make an effective comparison, but just
> for fun, I ran your scenario (6' OD, 4in thick shell) with average
> material properties for ordinary concrete, and it turns out it's good to
> over 1000 fsw!  See below.
>
> Sean
>
>
>
>
>
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