Mud Slab Over Top of Drilled Pier
Mud Slab Over Top of Drilled Pier
(OP)
I am working on a project where concrete walls will span between drilled piers. Will not have grade beams, maybe just a mud slab to set wall forms on. There are fairly heavily loaded pilasters at the piers, supporting concrete columns above. Contractor says for this condition they like to hold the pier down a few inches and run the mud slab over the top of the pier, in order to have a more finished surface to set the forms on, since top of drilled piers are typically very rough. Has anyone seen this done before and/or have any precautions?






RE: Mud Slab Over Top of Drilled Pier
Also check that the corner is not going to break off.
csd
RE: Mud Slab Over Top of Drilled Pier
RE: Mud Slab Over Top of Drilled Pier
RE: Mud Slab Over Top of Drilled Pier
RE: Mud Slab Over Top of Drilled Pier
I assume the "drilled piers" are what I would call bored piles. Aren't they constructed using either bentonite or polymer excavation support? If this is the case they need to be cast high and then trimmed to the correct level.
Otherwise why not just cast to the correct level and then spend some time getting a good enough surface to set the forms on.
RE: Mud Slab Over Top of Drilled Pier
RE: Mud Slab Over Top of Drilled Pier
RE: Mud Slab Over Top of Drilled Pier
Is my decription correct. The drilled piers (4' to 6'in diameter)will have cast in-situ walls between them. Directly above them the piers will have a rectangular column, which is in effect a thickening of the wall (a pilaster)
The pilaster will need formwork, the contractor intends to cast bliding concrete (mud slab) on which all this formwork will sit.
What we don't know is the dimension of the pilaster compared to the drilled pier. Assuming the pilaster is larger than the drilled pier the mud slab can surround the pier but not run over the top of it.
If the pilaster is of smaller dimension than the pier and the forms somehow have to sit on the pier then structural concrete wll have to be used.
RE: Mud Slab Over Top of Drilled Pier
RE: Mud Slab Over Top of Drilled Pier
RE: Mud Slab Over Top of Drilled Pier
You didn't read the OP properly. The contractor wants to run the "mud slab" through over the piers to simplify his formwork. Nothing wrong with that, in fact it shows good common sense. Mrengineer has stated that the "mud slab" concrete has to be strong enough to transfer the pilaster load.