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Re: slab thickness ConcreteFinishing&StuccoGuy 06-14-2005
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Posted by Bob Morrison on June 30, 2005, 4:38 pm
In a previous post RicodJour says...
> If I'm reading that right, and you can figure out a way to cast the
> driveway above grade and then lower it into place (!), you can go with
> as little as a 3" slab. Otherwise you need 6" if it's cast in place
> and reinforced.
>

Rico:

Your math is almost correct:

1-1/2" top cover
1/2" (actually 5/8" OD) for #4 Longitudinal bar
1/2" (actually 5/8" OD) for #4 transverse bar
3" bottom cover

Total = 5-3/4"

Using #3 bards drops the total to 5-1/2"

You would need at least that much concrete to get the steel to bond
properly anyway.

--
Bob Morrison, PE, SE
R L Morrison Engineering Co
Structural & Civil Engineering
Poulsbo WA

PexSupply Full Banner
Posted by RicodJour on June 30, 2005, 5:24 pm
Bob Morrison wrote:
> In a previous post RicodJour says...
> > If I'm reading that right, and you can figure out a way to cast the
> > driveway above grade and then lower it into place (!), you can go with
> > as little as a 3" slab. Otherwise you need 6" if it's cast in place
> > and reinforced.
> >
>
> Rico:
>
> Your math is almost correct:
>
> 1-1/2" top cover
> 1/2" (actually 5/8" OD) for #4 Longitudinal bar
> 1/2" (actually 5/8" OD) for #4 transverse bar
> 3" bottom cover
>
> Total = 5-3/4"
>
> Using #3 bards drops the total to 5-1/2"
>
> You would need at least that much concrete to get the steel to bond
> properly anyway.

Again with the math! You're such an engineer sometimes. ;)

They allow some leeway with the coverage - I believe it's +/- 3/8".

Oh, and coming from a woodworking background, I half-lap my rebar so
it's only one layer thick. ;)

R


Posted by Matt Whiting on June 30, 2005, 5:42 pm
RicodJour wrote:

> Again with the math! You're such an engineer sometimes. ;)
>
> They allow some leeway with the coverage - I believe it's +/- 3/8".
>
> Oh, and coming from a woodworking background, I half-lap my rebar so
> it's only one layer thick. ;)

And do you sand those nasty ridges off the rebar to make them smooth as
you would with wood? :-)


Matt

Posted by RicodJour on June 30, 2005, 5:49 pm
Matt Whiting wrote:
> RicodJour wrote:
>
> > Again with the math! You're such an engineer sometimes. ;)
> >
> > They allow some leeway with the coverage - I believe it's +/- 3/8".
> >
> > Oh, and coming from a woodworking background, I half-lap my rebar so
> > it's only one layer thick. ;)
>
> And do you sand those nasty ridges off the rebar to make them smooth as
> you would with wood? :-)

Hell, no! That would take foever and give inferior results. I turn
them down on the lathe.

Where have you been Matt? I'm guessing the spouse-enforced two week
vacation.

R


Posted by Matt Whiting on June 30, 2005, 6:43 pm
RicodJour wrote:

> Matt Whiting wrote:
>
>>RicodJour wrote:
>>
>> > Again with the math! You're such an engineer sometimes. ;)
>>
>>>They allow some leeway with the coverage - I believe it's +/- 3/8".
>>>
>>>Oh, and coming from a woodworking background, I half-lap my rebar so
>>>it's only one layer thick. ;)
>>
>>And do you sand those nasty ridges off the rebar to make them smooth as
>>you would with wood? :-)
>
>
> Hell, no! That would take foever and give inferior results. I turn
> them down on the lathe.
>
> Where have you been Matt? I'm guessing the spouse-enforced two week
> vacation.

Good guess. Yes, just returned from two weeks driving around the
southwest in NV, AZ, CO and UT. Nice country for a visit. A little
warm (I have a shot of the car thermometer at 108 or something
ridiculous like that), but with the low humidity I found it very
comfortable compared to PA with our 95 and 95 conditions.


Matt

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