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Re: Slab on grade

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That is of great help, thanks.

Will H.

On Mon, Nov 10, 2008 at 10:23 AM, Harold Sprague
<spraguehope(--nospam--at)hotmail.com> wrote:
> Reinforcing is to be placed per ACI 301, Section 3.3.2 (if you require ACI
> 301).  The contractor is in violation of the specs if he does not "Place,
> support, and fasten reinforcement as shown on the project drawings."  All
> the major flatwork contractors place their reinforcing on supports of some
> kind.  I don't give smaller contractors a pass.  I have no problem writing
> up a deficiency report.
>
> Further, "Hooking" WWR is prohibited in ACI 301:
>
> 3.3.2.5
>
> Welded wire reinforcement—For slabs on ground, extend welded wire
> reinforcement to within 2 in. of the concrete edge. Lap splice edges and
> ends of welded wire reinforcement sheets as shown on the project drawings.
> Unless otherwise specified or permitted, do not extend welded wire
> reinforcement through contraction joints. Support welded wire reinforcement
> during placing of concrete to maintain positioning in the slab. Do not place
> welded wire reinforcement on grade and subsequently raise into position in
> concrete.
> It is not a "methods and means" issue if it is specifically listed in your
> specs and in ACI 301.  Otherwise how do you determine compliance with ACI
> 117?  The contractors must support it somehow.  Whether they use dobies or
> bolsters could be "methods and means" unless you specify one or the other.
> But reinforcing is to be supported and fastened.
>
> I hear that "we do it all the time".  Longevity of code violation is not a
> good defense.
>
> Use a heavy WWR and they will not bend it down by walking on it.
>
> Regards, Harold Sprague
>
>
>
>> Date: Mon, 10 Nov 2008 08:26:12 -0500
>> From: gtg740p(--nospam--at)gmail.com
>> To: seaint(--nospam--at)seaint.org
>> Subject: Re: Slab on grade
>>
>> I have stated the WWR to be placed on dobies before on my drawings,
>> but they end up pulling it while pouring anyway. They try to make it a
>> means and methods issue. How do you make them always use the dobies?
>>
>> WH
>>
>> On Sun, Nov 9, 2008 at 5:59 PM, Harold Sprague <spraguehope(--nospam--at)hotmail.com>
>> wrote:
>> > As much complaining as I hear, I thought we would be talking megabucks
>> > difference, but when push comes to shove, there is no difference.
>> >
>> > I insist on dobies and using a 4x4 WWR makes it easier to walk on.
>> >
>> > Regards, Harold Sprague
>> >
>> >
>> >
>> >> Date: Sat, 8 Nov 2008 20:14:39 -0500
>> >> From: gtg740p(--nospam--at)gmail.com
>> >> To: seaint(--nospam--at)seaint.org
>> >> Subject: Re: Slab on grade
>> >>
>> >> In my area the WWR is always pulled into place during pouring, so the
>> >> location is not so reliable. But it is used way more often than
>> >> rebar.
>> >>
>> >> Does anyone have a relative cost comparison between using installed
>> >> rebar vs WWR that would provide the same steel area? Say #3 at 18" vs
>> >> WWR?
>> >>
>> >> Will
>> >>
>> >> On Sat, Nov 8, 2008 at 7:30 PM, Harold Sprague
>> >> <spraguehope(--nospam--at)hotmail.com>
>> >> wrote:
>> >> > It depends on the gauge of the WWR and the spacing of the dobies. The
>> >> > #3's
>> >> > with dobies at 4' o.c. will (in general) rebound easier than lighter
>> >> > gauge
>> >> > WWR.
>> >> >
>> >> > Regards, Harold Sprague
>> >> >
>> >> >
>> >> >
>> >> > ________________________________
>> >> > From: Rhkratzse(--nospam--at)aol.com
>> >> > Date: Fri, 7 Nov 2008 19:12:10 -0500
>> >> > Subject: Re: Slab on grade
>> >> > To: sgordin(--nospam--at)sgeconsulting.com; seaint(--nospam--at)seaint.org
>> >> >
>> >> > Is a #3 much better than WWF after a few hefty guys walk all over it?
>> >> >
>> >> > Ralph
>> >> >
>> >> > In a message dated 11/7/08 12:00:50 PM, sgordin(--nospam--at)sgeconsulting.com
>> >> > writes:
>> >> >
>> >> > This means that in your 4" slab, rebars at 12" spacing do not
>> >> > necessarily
>> >> > have to be #4, they can be #3 placed about 1.25" below TOC.
>> >> >
>> >> >
>> >> >
>> >> > **************
>> >> > AOL Search: Your one stop for directions, recipes and all other
>> >> > Holiday
>> >> > needs. Search Now.
>> >> >
>> >> >
>> >> > (http://pr.atwola.com/promoclk/100000075x1212792382x1200798498/aol?redir=http://searchblog.aol.com/2008/11/04/happy-holidays-from-aol-search/?ncid=emlcntussear00000001)
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