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My Increasing Interest In Forming.

 
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Old 09-21-2011, 06:01 PM   #121
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Re: My Increasing Interest In Forming.


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Building a basement, which side of the wall does the rebar go on? This is a trick question or loaded question, research it and give me the answer and tell me why
it goes in the centre?
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Old 09-21-2011, 06:59 PM   #122
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Re: My Increasing Interest In Forming.


No...research it
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Old 09-21-2011, 08:41 PM   #123
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Re: My Increasing Interest In Forming.


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it goes in the centre?
A good part of the answer has already been mentioned in a post within the first 30 posts of this thread. What is concretes strength and what is it's weekness? Where should the steel go based on the type of stresses on the concrete?
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Old 09-21-2011, 08:59 PM   #124
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Re: My Increasing Interest In Forming.


it goes inside the concrete
hmm.

I will take a guess, for i cannot find anything. I always thought it goes in the centre. I would say it goes on the inside so that it puts the outside of the wall in tension to hold the dirt back better also having it on the inside protects it from groundwater and soil. Must be covered with 1 1/2" min on the inside and 3" out
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Old 09-21-2011, 09:20 PM   #125
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Re: My Increasing Interest In Forming.


Close....

It goes on the inside based on there being something holding the top of the wall i.e. Floor System creating a diaphragm and helping evenly disperse pressure around to the other walls. Everything is working together and the rebar cannot or does not have the ability to stretch as much since it is further from the pressures of the backfill.

If nothing is supporting the top of the wall the rebar goes to the soil side and the footing is enlarge with a bigger portion to the inside (non backfill) to prevent the wall from tipping or pushing.

And since we have the advantage of the ICF form, coverage is only 3/4" min. (Both inside and outside) this allows aggregates to get in that area and the ICF gives us the balance of coverage.
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Old 09-21-2011, 09:25 PM   #126
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Re: My Increasing Interest In Forming.


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36DD
I feel a motor boat coming on!
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Old 09-21-2011, 09:25 PM   #127
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Re: My Increasing Interest In Forming.


You gonna take the job kid or what?
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Old 09-21-2011, 09:29 PM   #128
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Re: My Increasing Interest In Forming.


Okay...next...what are the 3 S's in concrete?

1 - S-------
2 - S-------
3 - S-------

And why do I think in about 4 hours DirtyWhiteBoy will be posting a new pic and a comment?
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Old 09-21-2011, 09:30 PM   #129
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Re: My Increasing Interest In Forming.


Okay...next...what are the 3 S's in concrete?

1 - S-------
2 - S-------
3 - S-------

And why do I think in about 4 hours DirtyWhiteBoy will be posting a new pic and a comment?
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Old 09-21-2011, 09:46 PM   #130
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Re: My Increasing Interest In Forming.


Quote:
Originally Posted by Chris Johnson View Post
Close....

It goes on the inside based on there being something holding the top of the wall i.e. Floor System creating a diaphragm and helping evenly disperse pressure around to the other walls. Everything is working together and the rebar cannot or does not have the ability to stretch as much since it is further from the pressures of the backfill.

If nothing is supporting the top of the wall the rebar goes to the soil side and the footing is enlarge with a bigger portion to the inside (non backfill) to prevent the wall from tipping or pushing.

And since we have the advantage of the ICF form, coverage is only 3/4" min. (Both inside and outside) this allows aggregates to get in that area and the ICF gives us the balance of coverage.
The way it was explained to me is, once you backfill, the outside of the wall is under compression and the inside of the wall is under tension. Just like when you load a floor joist. The top of the joist is under compression, the bottom is under tension. Concrete has great compressions strength, not such much tensile strength. So, you want to put your rebar towards the inside side of the wall.
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Old 09-21-2011, 09:48 PM   #131
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Re: My Increasing Interest In Forming.


your right, provided the top is supported.

You should see lintel details above openings, depending on the span and load it's carrying plus the width and height of it dictates bar size and stirrup spacing. I did a 34' clearspan beam, 6" core, 42" high with 2 #11 bottom bars, 40d splice (call it 4' splice), #5 @ 18" o.c.H and Stirrups #4 @ 6" o.c.V, 12' from each end. The #11 just about killed me, second floor sliding them in from the outside and the splice was ridiculous consolidating it.
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Old 09-21-2011, 09:54 PM   #132
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Re: My Increasing Interest In Forming.


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your right, provided the top is supported
That is interesting about walls with no top support. I never really thought about it and never heard anyone discuss it.
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Old 09-21-2011, 10:38 PM   #133
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Re: My Increasing Interest In Forming.


Nope, I not gonna touch that one. By the way I was as lost as Nick on that 36D stuff so all I could come with was Ayna And no there not Ds they are DD I've asked her bout em
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Old 09-22-2011, 09:18 AM   #134
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Re: My Increasing Interest In Forming.


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Originally Posted by Chris Johnson View Post
Okay...next...what are the 3 S's in concrete?

1 - S-------
2 - S-------
3 - S-------

And why do I think in about 4 hours DirtyWhiteBoy will be posting a new pic and a comment?
The 3 s's are the exposure to sulfate classifications
S1 (Moderate)
Soil: 0.10% ≤ SO4 < 0.20%
Water: 150 ppm ≤ SO4 <1500 ppm (and Seawater)
S2 (Severe)
Soil: 0.20% ≤ SO4 < 2.0%
Water: 1500 ppm ≤ SO4 <10,000 ppm
S3 (Very severe)
Soil: SO4 > 2.0%
Water: SO4 >10,000 ppm

SO4 is sulphate
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Old 09-22-2011, 09:21 AM   #135
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Re: My Increasing Interest In Forming.


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Nope, I not gonna touch that one. By the way I was as lost as Nick on that 36D stuff so all I could come with was Ayna And no there not Ds they are DD I've asked her bout em
d represents the diameter of rebar in the eqaution that will give you the minmum splice in my area when you multiply it by 36, for you and others such as in cali its 40d

eg.
#4 rebar is 1/2"

40 times .5 = 20" minumum lap on #4 rebar
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Old 09-22-2011, 10:30 AM   #136
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Re: My Increasing Interest In Forming.


Stone size

Slump

Spacing of trucks
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Old 09-22-2011, 10:31 AM   #137
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Re: My Increasing Interest In Forming.


And how are you replying to threads during school hours?
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Old 09-22-2011, 10:33 AM   #138
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Re: My Increasing Interest In Forming.


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And how are you replying to threads during school hours?



I'm learning a lot on this thread
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Last edited by Dirtywhiteboy; 09-22-2011 at 10:36 AM.
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Old 09-22-2011, 10:52 AM   #139
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Re: My Increasing Interest In Forming.


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Stone size

Slump

Spacing of trucks
oh. well i gave you an alternate

my school has computers, i have construction class
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Old 09-22-2011, 04:50 PM   #140
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Re: My Increasing Interest In Forming.


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I'm learning a lot on this thread
Me too...Like when I get to Hawaii I need to find Ice Coffee really quick

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