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Concrete Pad Setup Questionz

 
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Old 04-29-2019, 07:48 AM   #1
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Concrete Pad Setup Questionz


I have a guy who is providing my company all the flat work. generally 4" slab with rebar. not anything fancy.


This last job he has been doing things I feel are questionable.

we have to bring in crushed gravel 3/4 minus.
In the back corner we are almost 16" out of grade and the gravel is flowing out of the bottom of the green board. I'll attach pics.

My question is shouldnt he compact the gravel every 4" or 6"? or can he use a vibrator with the full 16"?

Also is it ok that the gravel is just flowing out the bottom of the green board?or should we add more boards?

Thanks in advance
I tried to add pictures but it's not working.
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Old 04-29-2019, 09:03 AM   #2
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Re: Concrete Pad Setup Questionz


Yes crushed stone should be placed in shallow lifts and compacted each lift. Thickness of lifts depends upon the material and the type of compactor.

I assume you mean that the stone under the slab is leaking out outside of the building and leaving a hollow void under the slab. This is a problem and will lead to the slab failing if they load it in that area. Build up some fill on the outside of the building if possible so the stuff under slab can't leak out. Crushed stone will never hold in place "vertically" at the edge of a building without a retaining wall of some sort.

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Old 04-29-2019, 04:56 PM   #3
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Re: Concrete Pad Setup Questionz


Would I be able to just add more gravel? or does it need to be something to hold the gravel back?
or would I just keep adding gravel till it hits the greenboard?


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Yes crushed stone should be placed in shallow lifts and compacted each lift. Thickness of lifts depends upon the material and the type of compactor.

I assume you mean that the stone under the slab is leaking out outside of the building and leaving a hollow void under the slab. This is a problem and will lead to the slab failing if they load it in that area. Build up some fill on the outside of the building if possible so the stuff under slab can't leak out. Crushed stone will never hold in place "vertically" at the edge of a building without a retaining wall of some sort.
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Old 04-29-2019, 04:59 PM   #4
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Re: Concrete Pad Setup Questionz


picture
Quote:
Originally Posted by Fishindude View Post
Yes crushed stone should be placed in shallow lifts and compacted each lift. Thickness of lifts depends upon the material and the type of compactor.

I assume you mean that the stone under the slab is leaking out outside of the building and leaving a hollow void under the slab. This is a problem and will lead to the slab failing if they load it in that area. Build up some fill on the outside of the building if possible so the stuff under slab can't leak out. Crushed stone will never hold in place "vertically" at the edge of a building without a retaining wall of some sort.
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Old 04-29-2019, 05:06 PM   #5
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Re: Concrete Pad Setup Questionz


How long have you been in the pole building business?
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Old 04-29-2019, 05:42 PM   #6
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Re: Concrete Pad Setup Questionz


I have been with the company for 1 year now. I dont know much of the concrete side and am not around when it comes to specifics.
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How long have you been in the pole building business?
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Old 04-29-2019, 08:53 PM   #7
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Re: Concrete Pad Setup Questionz


Did the topsoil get stripped off under the building? Doesn't look like it from here....

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Old 04-29-2019, 08:58 PM   #8
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Re: Concrete Pad Setup Questionz


I usually have the site leveled up before we start, and like to have the pad 3-6 feet larger than the building size depending on the elevation difference between the pad and the existing grade.

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Old 04-30-2019, 06:38 AM   #9
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Re: Concrete Pad Setup Questionz


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I usually have the site leveled up before we start, and like to have the pad 3-6 feet larger than the building size depending on the elevation difference between the pad and the existing grade.

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That's how it's typically done here too, then I can do finish grading inside.

If it isn't though, extra stone needs to be brought in on the outside and tamped just the same as the base inside.
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Old 04-30-2019, 08:19 AM   #10
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Re: Concrete Pad Setup Questionz


You need more stone (or soil) installed on the exterior of building and more gentle slope away from the building. Get some of the exterior fill up on that treated band board so the interior fill can't leak out under it.

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