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  #11  
Old 12-09-2013, 05:02 PM
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Default Re: hearth floor construction

Brittle concrete
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  #12  
Old 12-09-2013, 05:03 PM
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Default Re: hearth floor construction

Shrinkage cracking primarily, but ultimately if it is out of proportion it will weaken the mix design in flexural strength.

For the foundation slab, almost anything is strong enough, even the "fence-crete" garbage the big box stores sell as is. For anything with a span or cantilever you need more flexural strength which is tied to compressive, and the thinner the more important it is. If you are pouring a full 4" slab for the hearth, then a 2500 PSI is adequate. If you are slimming it down to 2-3" it is safer to use something with a higher flexural strength.

Flexural strength is not a standard that is used to designate bag mixes though, so you will never see it listed, and must infer it from the compressive.
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Old 12-10-2013, 05:47 AM
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Default Re: hearth floor construction

what role does the rebar play into the flexural strength of concrete?
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Old 12-10-2013, 05:50 AM
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Default Re: hearth floor construction

Almost all of it, provided it is placed correctly.
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Old 12-10-2013, 03:55 PM
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Default Re: hearth floor construction

so if two layers of bar are used, the top mat is under compression and the bottom mat would be under stress?
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  #16  
Old 12-10-2013, 05:19 PM
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Default Re: hearth floor construction

It depends upon the overall design, but for what we are doing here, one layer in the bottom third of the slab is normally sufficient, if not ideal. In a cantilever, both would be in tension, not compression.
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