> > On the other hand, very small bubbles are sometimes added 
> to the mix 
> > to make it handle frost better.  The name for this escapes 
> me at the moment.
> > 
> > Tony
> 
> Air Entrainment. Pretty important for outdoor concrete in 
> freezing climates.
> http://en.wikipedia.org/wiki/Air_entrainment
> 
> -Denny


Ah, that's it.  I used to live in an area where that was important.  I don't
like being cold.

Done since 1930!  Some of those old guys were pretty smart.

Tony

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