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Posted by Bobk207 on November 15, 2006, 4:49 am
Les Desser wrote:
>
> >I must be speaking to myself
>
> Not quite
>
> >when I recommend "Unreinforced Slabs on Grade". This an accepted and
> >regularly used practice.
>
> Accepted. I have thrown away the steel (metaphorically)
> >
> [...]
> >
> >Here's the basic procedure I recommend for residential parking areas
> >and driveways:
> >
> >1. Clear of the organics and any top soil to the slab + base depth.
> >2. Use a roller or plate compactor to compact the soil
> >3. Spread at least 6 inches of 3/4" minus crushed rock.
> >4. Use a roller or plate compactor to compact the gravel base
> >5. Form the edges of the slab
> >6. Pour at least 5 inches of concrete (6" for heavier traffic areas)
>
> I'll be laying 8" over the base on which the old slab (about 4-5") sat.
>
> >7. Within 12 hours cut crack control joints at least 1" deep.
>
> The slab is about 15' x 11'. I don't suppose I need the cuts.
>
> >8. Cure the slab for 2 weeks before loading.
>
> Will do.
> >
> >You can also place a geotextile fabric between the soil and the gravel.
>
> What would that be for?
> --
> Les Desser
> >You can also place a geotextile fabric between the soil and the gravel.
>
> What would that be for?
The geotextile fabric keeps the gravel base from migrating into the
soil below.
But since the base material is already in place, probably not worth the
effort to R&R.
You're in London area, UK correct?
Bob Morrison.....frost issues? None if his base is well drained?
But why is the old slab of 4 to 5" being replaced? DId it fail?
Cause?
Les...it appears that we may have missed some of the details or perhaps
you did not include them......I got the impression that this slab was a
whole new project, not a redo of a failed one.
cheers
Bob
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