Steel Basement Doors

How much stronger does structural fiber really make concrete?

I am in the process of a crazy project. I am pouring a ceiling/roof over my 12′x12′ basement entrance. I know, I know, your crazy! Oh well, I’m doing it anyway. I am peaking the ceiling so the center is much lighter than the outside edges (the outside edges will be sitting on solid, poured concrete walls 10″ thick and will be about 16″-18″ thick). I am framing out a void in the form to accomidate a 74″x52″ steel door. I will also be using ALOT of 5/8″ rebar ($300 worth) running from side to side both ways. Just so you know, I am bracing the bottom up with an insane amount of 2×4’s and 4×4’s… Anyhoo, my question is how much stronger will the structural fiber really make the concrete? My main concern is the center cracking along the peaked ceiling and I think thats what the fiber is basically for… The crete will hold without the fiber but I’m using it just for added piece of mind. Any expert input would be greatly appreciated. Thanx.

I told you the last time you asked this that I didn’t think it was a good idea. I hope you have at least talked to an engineer about it. In any case, with all the rebar you plan to use, fiber is unnecessary. You may have a bigger problem with the concrete not being strong enough to carry its own weight as well as the weight of the rebar. You seem determined to make this pour, so I will offer you one more piece of advice. Let the concrete set for 7 days before you strip the forms, then once you do, immediately place shores under it about every 5 feet or so apart. Leave these in place for 21 more days. Concrete reaches 95% strength in 28 days. Hopefully this works for you. Good luck.

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