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Can you cut a pre-tensioned slab?

Updated: 12/15/2022
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Q: Can you cut a pre-tensioned slab?
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What should you do if the lap for steel reinforcement is to short but is already in concerete?

Drill out the edge of the slab and add some dowels....or cut the slab back.


How do you remove a concrete slab?

You have to break it with a sledge hammer , cut it, dynamite it, dig it up or lift it up with a fork lift or caterpiller.


How much clear cover for the slab?

Slab 15mm


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How thick should a 30' x 40' concrete slab be?

4". A 4" thick concrete slab reinforced with 6 x 6 x 10 welded wire mesh placed over a 6 ml vapor barrier on 6" of levelled and compacted gravel or sand is common for many residential applications. I'm assuming there are no point loads anywhere in the slab interior and the slab is used for general purposes such as a residential basement, workshop, or garage floor. Any special circumstances should be engineered. All steps in the process are important, but one often overlooked is that the base needs to be properly compacted and prepared. A good base will be very level and very well-compacted. If the base is poor, the slab may need to be thicker or engineered. Slabs will crack where the thickness changes and stress forces become concentrated while it's curing and then while it's settling. If you have posts coming down anywhere in the field of the slab, be sure to cut control joints around them and across the slab to direct the inevitable cracks during curing and settling. Control joints are best when they are saw-cut to 1/3 the depth of the slab after the slab has set, and generally spaced 10-12' apart is good. Trowelled-in control joints do not work nearly as well as saw-cut. Also, remember to use an isolation material such as conventional felt strips at the slab edge to prevent mechanical bonding to adjacent walls and allow for slight differential movement.

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It really depends on the base structure and the legal rights. Who owns the slab? Is it providing structural support of some nature? Do you need access to both sides to accomplish the work? If so, will the other party agree to access? If the economic value of either property impacted if the slab was cut or otherwise changed? Does the cut need to be sealed or otherwise treated after a cut to protect the slab and the possible steel in the concrete?


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What should you do if the lap for steel reinforcement is to short but is already in concerete?

Drill out the edge of the slab and add some dowels....or cut the slab back.


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