Joints in screed
Joints in screed
(OP)
We are casting a concrete screed of 100 MM over raft what is the required joints for this slab and what is the pouring procedure and I need reference for this topic from aci
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RE: Joints in screed
If it isn't bonded, then our standard recommendation is twice the depth in feet, so a 4" thick (100mm) topping should have joints at 8ft (2440mm) o/c.
Is the topping reinforced? The amount of reinforcing can affect the joint spacing.
RE: Joints in screed
RE: Joints in screed
RE: Joints in screed
Intentionally bonding the topping, which generally requires roughening of the surface and adequate cleaning would restrain the topping and likely result in a randomized pattern of cracking in the topping. This would also result in any cracks in the raft to telegraph through the topping.
RE: Joints in screed
RE: Joints in screed
I did indicate what spacing I would recommend. I do not have a codified number to the ACI for that since I don't practice where the ACI code is used. But my local standard, CSA, is extremely similar. Crack control joints are not specifically laid out in the code for something like this. It is more of a recommendation and should be adjusted to each situation.
RE: Joints in screed
Should be 6 hrs to 8 hrs. 24 is way too long, specially for a thin topping. Microcracking has already determined the crack pattern and sawcutting it is nearly useless.
Dik
RE: Joints in screed