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 kind of lifetime can one expect from concrete that is exposed to  
temperature cycling such as Denver, CO ?
What kind of lifetime can one expect from concrete that is underground  
( 10 degrees C ) or inside a heated basement ?
What sayest the august members of the PIClist ?

What can be done to extend the life of existing concrete ?

Best
Gus

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