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Re: Simplified Concrete Paving 101

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Rich,
The depth of select base material is as important as the concrete itself.
The pressure on the existing soil decreases in proportion to the square of
the depth of the paving plus the base material.  I do not think the use of
wire mesh helps at all.  It always ends up at the bottom.  I always think of
the cartoon that Bob Tobin uses to show this, wherein the contractor is
shown standing on the mesh with two long hooks that he is supposedly using
to pull the mesh up into the center of the concrete with him rising up with
it.  Good trick if you can do it.
Many engineers like to use plain concrete which works if the base is right,
the concrete is designed with adequate strength and is really controlled at
the mixer and at the site and, if joints are close together and cut before
the mud sets (6 to 8 hours max).
I prefer to use good concrete, adequate base, and reinforcing of at least #4
at 16 to 18 " o.c.  The spacing is based on being large enough to permit the
contractors shoe to go between bars and not on them.  The size of bar is
based on the steel percentage necessary to prevent large cracks from
occurring which is also a function of the concrete quality and joint
spacing.
Richard Hess
----- Original Message ----- 
From: "Jim and Peggy Dall" <pdall2(--nospam--at)hotmail.com>
To: <seaint(--nospam--at)seaint.org>
Sent: Monday, January 16, 2006 6:38 AM
Subject: RE: Simplified Concrete Paving 101


> Rich, we have used 6" conc pavement with 6X6X6/6 wwf over 8" base with
good
> results for semi's at a loading dock.
>
>
> >From: "Rich Lewis" <seaint03(--nospam--at)lewisengineering.com>
> >Reply-To: <seaint(--nospam--at)seaint.org>
> >To: <seaint(--nospam--at)seaint.org>
> >Subject: Simplified Concrete Paving 101
> >Date: Thu, 12 Jan 2006 16:31:47 -0600
> >
> >I have resisted as much as possible doing any paving design.  I don't
like
> >civil site work.  I stick with structures only.  I have come into a
> >circumstance where I must specify some paving and I don't have any good
> >references.  Are there good references that describe concrete paving in
> >simple terms?  I don't have to do an active road design, more like
parking
> >lot type traffic, real slow.  I have heavy tank trucks using the road,
not
> >constantly, maybe several times a day.  The section of the road I have to
> >design is 28 feet wide and about 150 feet long.  I'm thinking the
subgrade
> >is probably going to be existing site soils, no significant prep, base
> >course, etc.  I may have crush stone base under it since the real road
> >beyond my limits is a gravel road.
> >
> >
> >
> >I have an old civil engineers handbook.  It has a 1 page section on
> >concrete
> >paving.  It doesn't really discuss design much at all.  Are there any
> >references that illustrate concrete paving design by a few cookie cutter
> >equations?  Any good websites with references?
> >
> >
> >
> >I downloaded the NAVFAC PCASE program.  It is a bit overkill for me.
> >Toying
> >with the program I came up with a 6.5" slab.  I'm not sure if I used it
> >right.  I'm thinking an 8 inch slab with nominal reinforcing, say #4 @
16"
> >o.c. top bars with one joint splitting the 28 ft. width and probably 7-8
> >joints on the length.  Does that sound reasonable for tank truck traffic
> >from someone with paving experience?  My gut says it's fine, but I don't
> >like putting a design on my drawings that I can't justify with
calculations
> >of some kind.
> >
> >
> >
> >Thanks for any help.
> >
> >
> >
> >Rich
> >
> >
> >
>
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