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Any negative consequences to high fly ash content in structural concrete? My sub just poured a foundation with 40% fly ash content. I specified 20% -25% because I had heard somewhere that content above 35% can have adverse consequences. Any thoughts, experiences to share?
 

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What does the engineer have to say?

Fly ash is a retarder and can delay finishing of a slab, but the ultimate strength can be the same.
 
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