ACI-318 110.15 ù column loads through floor sys
ACI-318 110.15 ù column loads through floor sys
(OP)
Say you have an elevated slab, your columns are 12Ksi, your slab is 5ksi, and you have 24dx24w beams. The 12ksi mix is 8-10" slump mix (high range water reducer) and really runs laterally in the form. So the contractor it going to puddle the 12ksi mix through the depth of the beams and follow the instructions below:
ACI318 10.15.1 — Concrete of strength specified for the column shall be placed in the floor at the column location.
Top surface of the column concrete shall extend 2 ft
into the slab from face of column. Column concrete
shall be well integrated with floor concrete, and shall
be placed in accordance with 6.4.6 and 6.4.7.
The contractor wants to use Stay-form to block-out the 2' zone around the column through the depth of the beams. This will prevent the 12ksi mix from running away. Stacking concrete at the columns doesn't work and placing the 12ksi at a low enough slump to prevent running risks too fast a set and a potential cold joint.
http://amico-stayform.com/
Will the use of this product satisfy the requirements of 10.15.1? Of course the two concrete mixes will not be "well integrated" but both mixes will be well consolidated on either side of the Stay-form.
Any thoughts?
ACI318 10.15.1 — Concrete of strength specified for the column shall be placed in the floor at the column location.
Top surface of the column concrete shall extend 2 ft
into the slab from face of column. Column concrete
shall be well integrated with floor concrete, and shall
be placed in accordance with 6.4.6 and 6.4.7.
The contractor wants to use Stay-form to block-out the 2' zone around the column through the depth of the beams. This will prevent the 12ksi mix from running away. Stacking concrete at the columns doesn't work and placing the 12ksi at a low enough slump to prevent running risks too fast a set and a potential cold joint.
http://amico-stayform.com/
Will the use of this product satisfy the requirements of 10.15.1? Of course the two concrete mixes will not be "well integrated" but both mixes will be well consolidated on either side of the Stay-form.
Any thoughts?






RE: ACI-318 110.15 ù column loads through floor sys
This could be a potential problem in that with a cold joint you would have a whole set of development lengths to consider....your shear capacity at your beams would be possibly affected, etc.
My initial thought would be to use the forms, but use them not as "stay" forms but rather as temporary forms, allowing separate placements of the two types of concrete, then once the concrete is in place, pulling the forms vertically up and then vibrating around the perimeter to mix and integrate the two mixes.
RE: ACI-318 110.15 ù column loads through floor sys
RE: ACI-318 110.15 ù column loads through floor sys
RE: ACI-318 110.15 ù column loads through floor sys