Mix up in grade of concrete
Mix up in grade of concrete
(OP)
I had specified the contractor to lay down an M20 concrete slab for a two storey residential building but he layer down an M10 grade. Will it cause any problems and are there any precautions to take or any procedures to strengthen the concrete






RE: Mix up in grade of concrete
The short answer: you need to check with your structural designer. It can cause significant problems in some cases (especially the elevated slab).
Typically any attempt to strengthen concrete that has already been poured is more expensive than just removing and replacing the concrete in question. In some cases, your engineer may be able to come up with a creative and cost-effective solution.
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The name is a long story -- just call me Lo.
RE: Mix up in grade of concrete
RE: Mix up in grade of concrete
Dik
RE: Mix up in grade of concrete
In your case you know that the wrong mix was used but you will eventually get compression test information back and you can and should respond to those results.
Many times the actual test results (and resulting fc value) will come up higher than that intended.
It may be (based on Lomarandil's reference to the structural check of the slab) that the lower strengths still work. Just have to check.
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RE: Mix up in grade of concrete
RE: Mix up in grade of concrete
RE: Mix up in grade of concrete
Or replace it. Those are your options.