undercut/over excavated footing w/flow-able fill
undercut/over excavated footing w/flow-able fill
(OP)
Got a 10'x10' spread footing that needed to be undercut, over excavated in depth, to get down to suitable bearing material (rock).
Used 19yds3 of 4500psi concrete as backfill to get back up to bottom of ftg elevation.
The contractor wants to place the forms, the rebar, the column dowels, and then place the concrete for this foundation later today even though the flow-able fill was placed this morning. To speed up the flow-able fill set time a couple of bags of calcium chloride were used. No rebar was placed in the flow-able fill so no worries there...and this won't affect the rebar in the footing? Right?
Used 19yds3 of 4500psi concrete as backfill to get back up to bottom of ftg elevation.
The contractor wants to place the forms, the rebar, the column dowels, and then place the concrete for this foundation later today even though the flow-able fill was placed this morning. To speed up the flow-able fill set time a couple of bags of calcium chloride were used. No rebar was placed in the flow-able fill so no worries there...and this won't affect the rebar in the footing? Right?






RE: undercut/over excavated footing w/flow-able fill
BA
RE: undercut/over excavated footing w/flow-able fill
RE: undercut/over excavated footing w/flow-able fill
Too late for plastic; already poured. The EOR wanted and got a 2'x2'x6"D key in the middle and a rough surface overall.
Why 4500 psi: there is one approved concrete mix for the project so they just used that.
Thanks.
RE: undercut/over excavated footing w/flow-able fill
BA
RE: undercut/over excavated footing w/flow-able fill
The contractor probably used 3 inch cover for a footing cast against earth, which will provide substantial protection to the rebar.
Except for ease in correctly placing the rebar, I'm not sure why you would need to place the concrete in two lifts, rather than simply locating the rebar in the top of a deeper footing.