I think a lot depends on the quality of the concrete, the quality of  
the pour, and the environment.

For example, the costal defense batteries here in Western WA were  
built around the turn of the century from the best concrete then  
available: imported from Belgium around the Horn. After being exposed  
to wet and occasionally freezing conditions for 100 years, the  
concrete is still in excellent shape.

Aside from sealing the surface of the concrete somehow, I'm not sure  
what could be done after the fact to improve lifespan.

-Pete

On Aug 29, 2009, at 5:37 PM, AGSCalabrese wrote:

> A contractor told me today that concrete has a service life of 80  
> years.
> He said 40 years getting stronger and then 40 years of decline.
> This seems odd to me.   I am looking at my dwelling that was built in
> 1908.  The concrete foundation does not look like it is deteriorating.
> I recently cut a hole into the foundation and it was a b**ch.
> ( difficult )
>
> What sayest the august members of the PIClist ?
>
> If true, can anything be done to extend the life of concrete ?
>
> Best
> Gus
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