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Re: W/C ratio

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Harold Sprague wrote:

>The old theory is that if you lower the w/c ratio you will have less
shrinkage.  A lower w/c ratio will reduce bleed water and reduce
permeability,
but has not much effect on shrinkage. <

What is your basis for this statement?  I don't think that this is an
accurate
statement.  Less water in a concrete mix should translate into lower
shrinkage.  However, if one obtains a lower water-cement ratio by increasing
the cement content, then nothing is gained.  So it depends upon how one
obtains a lower w-c ratio.