What makes to be the best ready mix concrete for precast/prestressed product?

im working in a precast/prestressed/ and post-tensioning const. company as a QC.

Answer:
i think that any brand of sack mix is going to yield the same results.. my advice to you is to use enough water to hydrate your mix, but make sure your slump stays low enough that you aren't altering your breaks. Are you throwing in some coarse aggregate? That can increase your break strength.

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