Re: Cracking in undesirable places! Help!
<shakes head and walks away>
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Re: Cracking in undesirable places! Help!
Thanks for all of your help. Looks like I will need to cancel the party anyway on account of thunderstorms.
Here's another idea. In addition to a third leg, what about filling up the entire underneath part (where the wood is being stored) with cinder blocks? Creating a cube of cinder block underneath supporting the slab so the slab itself is holding barely any weight. Even if the slab broke, it would have nowhere to go. Am I right? I could then cover the cube of cinder block with a stone veneer just to make it look nicer.
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Re: Cracking in undesirable places! Help!
Originally posted by Tscarborough View PostIf you have enough empirical knowledge to engineer it. 2 bars in a couple of sacks of Quickcrete ain't engineering.
I don't subscribe to building a bomb shelter to house an oven if there is an easier way that allows the use of less materials and labour.Last edited by david s; 06-19-2015, 11:38 PM.
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Re: Cracking in undesirable places! Help!
Originally posted by jgd915 View PostAs of now the cinder block legs are shaped like a U...would building a third cinder block leg down the center help? Also, is it a bad idea to have my party, a long, hot fire? Would I be better off cancelling the party and only using this oven for personal use (3-4 pizzas, fires only lasting a few hours) or will that not make a difference?Last edited by david s; 06-19-2015, 11:28 PM.
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Re: Cracking in undesirable places! Help!
Originally posted by david s View PostYou can get away with a slab less than 4", provided the oven is small and not too heavy, by cantilevering the slab over supporting piers. This reduces the required span and places the support right under the heaviest parts of the oven.
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Re: Cracking in undesirable places! Help!
Here is a 2" slab that won't crack. To start only an idiot would monolithically pour an "L" shaped section of thin concrete, it is almost guaranteed to crack at the inside corner. That is why there is no inside corner, it is a radius, distributing the stress over enough area that the tensile strength will withstand it. There is also a section of 4" CMU ladder wire across the expected crack as well as the same on the perimeter and around the cutout for the sink, chocked to 3/4" above the bottom of the pour. This is NOT a suspended slab, however, it was poured on top of a left in place hardibacker form.
There is no rebar in it, at 2" even 3/8" rebar does not allow enough coverage over the bar to be effective, and in effect creates a weak plane and probable crack down the road. The mix design is 5500PSI concrete, with 25% of the mix water replaced with latex additive, and a medium loading of poly fibers. Final flexural strength is probably North of 8000PSI.
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Re: Cracking in undesirable places! Help!
If you have enough empirical knowledge to engineer it. 2 bars in a couple of sacks of Quickcrete ain't engineering.
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Re: Cracking in undesirable places! Help!
Originally posted by david s View PostYou can get away with a slab less than 4", provided the oven is small and not too heavy, by cantilevering the slab over supporting piers. This reduces the required span and places the support right under the heaviest parts of the oven.
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Re: Cracking in undesirable places! Help!
You can get away with a slab less than 4", provided the oven is small and not too heavy, by cantilevering the slab over supporting piers. This reduces the required span and places the support right under the heaviest parts of the oven.
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Re: Cracking in undesirable places! Help!
Originally posted by jgd915 View PostHow exactly do you think it will break? The crack healed over night and are now pretty much gone. Eventually will the slab just split down the middle and crumble?
just sayin'
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Re: Cracking in undesirable places! Help!
Portland cement does not exhibit autogenous healing. The crack is structural, that means it affects the structural integrity of the slab. It has already failed because concrete does not have the flexural strength to support a suspended slab at 2 or 3 inches thick unless you have an engineered mix design and reinforcement schedule.
It may completely fail tomorrow or never, it doesn't matter, because you would enjoy your oven more if built correctly. Use it until you can rebuild it, then start over and either follow some plans or research it some more.
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Re: Cracking in undesirable places! Help!
How exactly do you think it will break? The crack healed over night and are now pretty much gone. Eventually will the slab just split down the middle and crumble?
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Re: Cracking in undesirable places! Help!
Originally posted by jgd915 View PostIs heat or weight the issue?Last edited by david s; 06-19-2015, 04:24 PM.
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Re: Cracking in undesirable places! Help!
Is heat or weight the issue?
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Re: Cracking in undesirable places! Help!
I am sure it will last for a while, but with a center support and it will last longer.
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