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RE: Separating slab on grade[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: seaint(--nospam--at)seaint.org
- Subject: RE: Separating slab on grade
- From: "Lutz, James" <James.Lutz(--nospam--at)earthtech.com>
- Date: Wed, 16 Jul 2003 08:59:25 -0700
Sounds like plain ol' shrinkage to me. Without steel reinforcement and a fairly low drag coefficient for the subgrade, there isn't much to hold it back. If you had two unreinforced slabs 17 ft long placed together, a gap of 1/8 to 3/16 represents free shrinkage of about 600 to 900 microstrains, which is not out of the ordinary, especially if the mix was rich (hot) or had a high w/c ratio to start with or poor quality control of the curing process. The mesh reduces permeability, reduces microcrack widths, and helps combat plastic shrinkage cracking, but doesn't begin to replace reinforcement in terms of structural strength or overall shrinkage control. I've mostly stopped using it and think it has been way oversold.
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