diamond cut in slab around steel column
diamond cut in slab around steel column
(OP)
This may seem like a very basic questions, but I have specified the standard detail of the diamond cut around a steel column in the concrete slab at the base for almost every steel project. In the diamond cut, we call out to put 1/2" expansion joint, and then a construction or control joint coming off the corners of the diamond. I've never questioned it before, but now I am wondering why. Why do we do the diamond? Is there a certain clear distance you should keep between the column and the diamond cut? Why? Why not felt instead of the expansion joint material?
Is there a better way to do this detail?
Is there a better way to do this detail?






RE: diamond cut in slab around steel column
RE: diamond cut in slab around steel column
If all of the concrete volume change is away from the column (ie the control joints intersect at the column) you can probably get away with felt.
Otherwise, you have reentrant corners at the column and you need space for the concrete slab to shift around the column.
Sometimes additional reinforcing is desired to minimize the width of cracks that do form at the corners.
RE: diamond cut in slab around steel column
RE: diamond cut in slab around steel column