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Re: Fly Ash

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I agree with Brent Koch's reply - since effects of fly ash on shrinkage can
vary, you should ask your concrete supplier to provide shrinkage test data
to
support claims that the addition of fly ash will reduce shrinkage of that
mix.
 If the addition of fly ash reduces the water content due to improved
workability, that may help reduce shrinkage.  PCA states "The most important
controllable factor affecting shrinkage is the amount of water per unit
volume
of concrete...some finely divided mineral admixtures such as fly ash have
little or no effect on drying shrinkage.  Drying shrinkage can be evaluated
in
accordance with ASTM C157."