Does bored pier concrete need a specific slump for pouring into the hole?

Yes — pouring into a narrow, deep hole genuinely needs a more flowable mix (a higher slump) than a standard slab pour, so the concrete fully fills the pier without leaving voids or getting stuck partway down.

This is a genuine specification your concrete supplier and contractor manage on the day, matched to your pier’s depth and diameter, not something left to whatever mix happens to be on the truck.

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