] [Thread] [Date] [Author]

["Gary Hodgson & Associates" <ghodgson(--nospam--at)bellnet.ca>]

Gail et al,
The Ontario Ministry of Transportation buils their 4
lane concrete highways that way-sub-base, asphalt layer,
then chairs, epoxy coated rebar and then gobs of
concrete.
Non-highway person Gary



On 30 Sep 2005 at 16:40, gskwy(--nospam--at)aol.com wrote:

> You might want to do a search on "whitetopping" applications, where
> whitetopping means putting concrete pavement over asphalt.
> 
> Whitetopping has been very heavily promoted by the concrete industry.
> 
> Gail Kelley 
> 
> -----Original Message-----
> From: Roger Davis <rdavis(--nospam--at)sdsarch.com>
> To: seaint(--nospam--at)seaint.org
> Sent: Fri, 30 Sep 2005 14:04:44 -0500
> Subject: RE: Slab-on-asphalt?
> 
> 
> We designed an addition to a motel once.  When the contractor started
> work, he found that a portion of the existing wood framed motel had
> been built with sleepers placed on the existing asphalt pavement.  
> The asphalt hardly qualified as a frost depth footing for Wisconsin. 
> The building was in good condition.
> 
> I would make the owner aware of the potential for a story getting out
> that the building was over asphalt.  Some occupant with a personal
> injury attorney on retainer might start complaining of headaches.
> 
> Roger C. Davis
> Architect
> 
> [Image removed]  
> 205 N. Dewey St.
> Eau Claire, WI 54703
> P (715) 832-1605
> F (715) 832-7850
> 
> -----Original Message-----
> From: Bruce Holcomb [mailto:bholcomb(--nospam--at)brpae.com] 
> Sent: Friday, September 30, 2005 1:32 PM
> To: seaint(--nospam--at)seaint.org
> Subject: Slab-on-asphalt?
> 
> We are doing a small addition to an existing building here in
> Springfield, Missouri and the addition is located where part of the
> parking / drive area is now.  It is 1-story, slab-on-grade (or on
> asphalt. see below) with spread column footings and a stemwall /
> continuous footing around the perimeter.  The Contractor wants to dig
> through the asphalt for the continuous footing and spread footings,
> but simply place the slab on the existing asphalt parking lot.  His
> argument is "It's been there for 20 years with car, truck and semi
> traffic and it is in great shape."  I don't know yet if any of that
> statement is true. hopefully we'll be able to verify some or all of
> it.  
> 
> I have a few reasons why it would be better to remove all the asphalt
> in the building foot print, but nothing that is really a "smoking
> gun".  At this point, there isn't a geotech involved and I doubt there
> will be.  We typically use a 4" slab reinforced with 6x6-10/10 WWF
> over a 4" gravel drainage layer.  Can we place the slab on asphalt (no
> gravel. just a 4" slab with the 6x6 10/10 WWF?  Any advice?  
> 
> 
> Bruce D. Holcomb, PE, SE
> Structural Engineer & Vice President
> Butler, Rosenbury & Partners
> 319 North Main, Suite 200
> Springfield, MO 65806
> 417-865-6100
> 417-865-6102
> 
> 



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