glenn
 New Member
 Posts:9
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| 15 Dec 2010 07:39 AM |
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we poured a 60x80 building with 22' tall icf wall with a 6'' core 18'8'' of the wall was above grade we put #4 rebar every 16''' horizotal and #4 every 2' vertical we noticed if some deflection in the wall just by slamming your shoulder into it is this normal
glenn |
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smartwall
 Veteran Member
 Posts:1209

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| 15 Dec 2010 07:59 AM |
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No it's not normal. Use a thin screw driver and check for voids. Was the steel placement engineered? Did you consolidate the wall as you poured? Was the wall poured in one lift? |
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glenn
 New Member
 Posts:9
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| 15 Dec 2010 08:44 AM |
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the wall was done in 2 lifts the cold joint is in the middle our vertical rebar are overlaped 4' and we did vibrate ,and when i say deflection it might only be moving a 1/6 of an inch |
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scicf
 New Member
 Posts:67
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| 15 Dec 2010 03:33 PM |
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Seems the rebar schedule for the verticals is a little undersized for the size building. Is this what was engineered or was this just done? I recently poured a 64x40 that had #5 bar at 2' vertical and #4 bar at 16" horizontal with 23' above grade. ANY deflection would have me checking for voids or a bad concrete mix. There should be NO movement in a 6" core wall. Something is not right. |
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glenn
 New Member
 Posts:9
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| 15 Dec 2010 04:16 PM |
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my brother was running the hose and i was watching the concrete flow myself so im sure there are no voids but i will check again i asked the concret plant owner if this was normal on a wall this size he said you would have some deflection if you were to put your shoulder into it |
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Alton
 Veteran Member
 Posts:2164
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| 15 Dec 2010 04:35 PM |
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Is the concrete portion of the wall actually moving or is it just the foam deflecting? If someone pushes on one side of the wall, does the other side move? Or is the wall just vibrating?
I do not remember seeing a placed concrete wall move from just a person's effort. Heavy equipment can knock down a wall but there is a lot more force there. |
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Residential Designer & Construction Technology Consultant -- E-mail: Alton at Auburn dot Edu Use email format with @ and period . 334 826-3979 |
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glenn
 New Member
 Posts:9
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| 15 Dec 2010 05:00 PM |
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not sure if it is moving or vibrating were going to string it tomorrow but yes i slammed into it from one side and my brother could feel in on the other . i was suprised to feel it move but I would think it would take alot to make this wall fail |
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dmaceld
 Veteran Member
 Posts:1465

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| 15 Dec 2010 05:55 PM |
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Concrete will flex some. Ever been on a long bridge when a truck goes by? That's also the principle behind pretensioned concrete beams.
The only question here is whether a person can realistically apply enough force to cause a little bit of deflection in the concrete slab you have here. A wall is just a slab sitting on its edge. I don't know, but an engineer experienced in concrete could tell you. How long ago did you pour the wall? The concrete might still be a bit soft.
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| Even a retired engineer can build a house successfully w/ GBT help! |
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Alton
 Veteran Member
 Posts:2164
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| 15 Dec 2010 07:16 PM |
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If this wall was placed recently during cold weather then it may not have gained sufficient strength to resist light pressure.
Is there any chance that this wall froze before the concrete set enough? |
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Residential Designer & Construction Technology Consultant -- E-mail: Alton at Auburn dot Edu Use email format with @ and period . 334 826-3979 |
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smartwall
 Veteran Member
 Posts:1209

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| 15 Dec 2010 08:35 PM |
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So what your saying is that you poured the wall in 2- 11' lifts.. The wall was built 11' then poured, then another 11' with a final pour. That would be a single 11' pour each time |
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glenn
 New Member
 Posts:9
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| 15 Dec 2010 11:12 PM |
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the pour is a couple of weeks old it did have a couple of days of decent wheather before it got real cold , and correct we poured 2 11' lifts |
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smartwall
 Veteran Member
 Posts:1209

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| 16 Dec 2010 04:27 AM |
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This a pretty good sized building . It must have overhead door openings. How did you treat the lintels over the openings as far as rebar placement. |
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wes
 Advanced Member
 Posts:810
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| 16 Dec 2010 08:01 AM |
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You did not mention if you have any type of pilasters incorporated into the walls. With that length of wall, I would think at least two per wall would be needed. Also, no mention of any type of floor or roof system in place, or not. No one else seems surprised at the use of a 6" core for a 22' tall wall, especially of these dimensions. I am. I would think a thicker core would be needed for the situation, especially if there are no floors to reinforce these 22' vertical walls. |
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| Wes Shelby<br>Design Systems Group<br>Murray KY<br>[email protected] |
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glenn
 New Member
 Posts:9
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| 16 Dec 2010 08:50 AM |
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yes there are rafters with 2x8 bottom cords but and a 5'' slab on the ground , what suprises me is i see block wall with these demensions in commercial applacations all the time |
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TexasICF
 Advanced Member
 Posts:622

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| 16 Dec 2010 11:10 PM |
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Ask your concrete supplier what the aire (pronouned air) content factor is. This will impact the flexibility of the concrete - and by design. Bridges and the like have a high aire content to allow flexibility. Specs sometimes limit aire content in concrete for rigidity. Regarding the rebar -- many engineers will call out a less stringent horizontal e.g. number 4 on18" inch O.C. and call out number 5's on 16 0.C. for vetiticals. Regards. |
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smartwall
 Veteran Member
 Posts:1209

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| 17 Dec 2010 07:53 AM |
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I'm not trying to rag on you but there are two glaring problems with your job. The first is the fact that the recomended lift height for icf's is 4'. The reason for this is that you have webs that retard the flow of concrete. A recomended 6 slump is not as runny as everyone thinks. The rebar retards the flow of concrete . The type and spacing of the webs will also keep the concrete from flowing. Some forms have dove tail interiors, this also slows the flow versus a smooth interior. The second problem is related to the first and that is there is no way you can vibrate a 11' foot wall to make sure you have a fully consolidated wall. Many people use 1" pencil vibrators which are useless on icf's let alone be able to vibrate the 11' wall that you poured. I'm with Wes this should have had pillasters. I think you're not in a snow load area show you might be safe. but I question the viablity of this building. This is my last question. Did you get the material from a distributor and did they give you any guidance on this build? |
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BrucePolycrete
 Advanced Member
 Posts:524
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| 17 Dec 2010 08:34 AM |
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Smartwall is right on the both points. But if you used Polycrete ICFs, you would not have as much concern. Steel cross ties made with .16" (4 mm) do not impede the flow of the concrete, and a welded mesh made from the same steel wire inside the foam panel allows you to go to town with a standard vibrator -- you can't break the form. |
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peterswet
 New Member
 Posts:59
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| 17 Dec 2010 07:38 PM |
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@ Smartwall : Hi ,would you elaborate on how a 1" vibrator is useless on icf walls? It seems to be the recommended tool by most manufacturers? I uses this on a 14 ft wall with 3 lifts and had excellent consolidation ? Peter |
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atitagain
 New Member
 Posts:14
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| 17 Dec 2010 09:03 PM |
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Is there follow up and a conclusion to this posting? |
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ICFHybrid
 Veteran Member
 Posts:3039
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| 18 Dec 2010 09:36 PM |
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I am doing a 21' wall in 6", but the steel is #5 bar @16" both ways. I doubt a human body is "bending" 6" of reinforced concrete even if it was a bad set. What are the footing dimensions and what tiebar was used?
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