RE: Mat Foundation[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: "'seaint(--nospam--at)seaint.org'" <seaint(--nospam--at)seaint.org>
- Subject: RE: Mat Foundation
- From: "Lutz, James" <James.Lutz(--nospam--at)earthtech.com>
- Date: Fri, 1 Apr 2005 11:27:25 -0800
If you are talking about joint filler, I wouldn't think so, assuming this is a grade slab. I don't know what the application for this mat is. The ones this size I have run into are usually foundations for heavy process equipment, and I assume you have reinforcement continuity across the pours. I would add some trim steel parallel to and on each side of the joints near the top for crack control, maybe heavier on the second pour side.
What happens is that the first pour is stronger and has already done some shrinkage by the time the adjacent pour is made. The second pour is weaker than the first one while it is in early shrinkage mode, and the restraint provided by the first pour tends to cause cracks in the second pour. Check the joints for shear capacity based on shear friction, and roughen them up before the second pour. I usually don't use keys.
If you must use dowels, consider using plate dowels instead of straight bars, which aggravate the shrinkage cracking problem. The plate dowels are square and installed with the diagonal aligned with the joint face, so that when the concrete shrinks the dowel doesn't restrain it in the horizontal plane.
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