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RE: Increase of f'c over time

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> -----Original Message-----
> From: Barclay, George
> Gentlemen,
> I am performing a job that involves the capacity of structural plain
> concrete.  The new (heavy equipment) demand exceeds the flexural
> capacity of
> the member using the original concrete strength given in the 1960
> construction documents.  The client obviously wants to avoid
> modification of
> the structure.  He has good reasons which I will not go into here, for
> length of the discussion.  I know that concrete strength increases over
> time.  I spoke with one of my grad school professors from whom I
> originally
> heard of this increase.  He said that he wouldn't be surprised if the
> strength of the concrete had as much as doubled over that amount of time.


Prof. Neville's book, already recommended, has a number of interesting
charts and references. One that may be useful is ACI Materials Journal, Vol
88, No. 6 (1991): S. L. Wood, Evaluation of the long-term properties of

Peter James, P.Eng

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