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Pockets / slots on concrete shearwall for slab reinforcing bar splice

Pockets / slots on concrete shearwall for slab reinforcing bar splice

Pockets / slots on concrete shearwall for slab reinforcing bar splice

(OP)
Hi All,

When casting concrete shear walls by means of climbing shutter if the wall is to be cast through multiple floor slabs, the connection with the slab could be achieved by means of slots provided for slab reinforcement to pass through. What good methods could one employ to avoid air-entrapment and consolidation problems within the slots when casting the slab?

How effective is it forming say 20’ overcast at sloping bird-mouth above the slots?

Thanks.

RE: Pockets / slots on concrete shearwall for slab reinforcing bar splice

I usually use 'Z' shaped dowels and the one leg of the Z and part of the 'shank' are cast into the wall with the remaining part of the shank and the other leg of the Z cast into a keyway and field bent to continue into the slab.

Difficult to describe, I'll see if I can locate a detail.

Dik

RE: Pockets / slots on concrete shearwall for slab reinforcing bar splice

(OP)
Thanks for your response Dik,

I'm not quite sure how the Z shaped bar you mention work, but if it requires field re-bending like a pull-out bar shown on the attached detail its won't be desirable with larger diameter reinforcing bars as it usually causes them to kink.

RE: Pockets / slots on concrete shearwall for slab reinforcing bar splice

(OP)
Anybody sad

RE: Pockets / slots on concrete shearwall for slab reinforcing bar splice

It's like your detail, but Z shaped to provide a standard hook and not a U.

Dik

RE: Pockets / slots on concrete shearwall for slab reinforcing bar splice

I don't like to have blockouts in the wall and would rather have inserts that can provide anchorage into the wall and the slab reo is threaded to fix into the inserts. The blockouts in my opinion will lose the bearing cause of the small settlement when placing the slab concrete.

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