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Re: Placing Concrete in Vault

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Moni -

I'd specify a "pea gravel" mix (3/8" aggregate), plus the superplasticizer,
but I wouldn't increase the slump past 4" or so.  Using the higher slump
(6"-7") can potentially cause curing and cracking problems, especially since
your walls are so thick.

Just my opinion.

Bruce Resnick, SE
Parker Resnick Str. Eng.