ACI-318 6.4.6 - under-poured column/shearwall

[boffintech]

Say you have a concrete placement for an elevated slab and a column or shearwall from below that slab is found to have been under-poured. How under-poured does a vertical element from below have to be before you start to consider ACI-318 6.4.6?

ACI-318 6.4.6 — Beams, girders, or slabs supported by columns or walls shall not be cast or erected until concrete
in the vertical support members is no longer
plastic.

 

[JAE]

If you are placing concrete on a form system that doesn't rely on the supporting columns, but rather the floor below, then probably not an issue.

 

[hokie66]

This provision is to allow the column or wall concrete to consolidate before the horizontal structure is cast, thus avoiding a gap at the top of the column. So if it is only a few inches or even a foot, no problem.