To: "'seaint(--nospam--at)seaint.org'" <seaint(--nospam--at)seaint.org>
Subject: RE: Concrete Overlays
From: "Sprague, Harold O." <SpragueHO(--nospam--at)bv.com>
Date: Tue, 10 Jul 2001 10:10:27 -0500
Re: Parking Structures : Planning, Design, Construction, Maintenance, and
Repair, 3rd Edition, Chrest - Editor.
It contains a section on overlays. The Portland cement and low slump (Iowa
Method) should be about 3" thick but they are the least expensive. The
silica fume and latex-modified can go down to about a 1 1/2" thickness. The
latex modified is very expensive at about $300 per cubic yard. Depending on
the volume I would opt for either the condensed silica fume or the epoxy
If the area is relatively small I would go with Sika
http://www.sikacanada.com/eng/constr/cat/procat.htm. Call out the Sika rep,
and ask for a recommendation. Consider one of the SikaTop products. They
have products that can go to a feathered edge. The nice thing about Sika is
their warranty, and the applicators are required to be trained.
Harold O. Sprague
> -----Original Message-----
> From: GSKWY(--nospam--at)aol.com [SMTP:GSKWY(--nospam--at)aol.com]
> Sent: Monday, July 09, 2001 9:27 PM
> To: Seaint(--nospam--at)seaint.org
> Subject: Concrete Overlays
> I am looking for some ideas/recommendations for a concrete overlay on a
> loading dock ramp.
> The ramp is approximately 30 years old, approximately 100 ft long, is
> steep and was built with lightweight aggregate (expanded shale). A lot
> the aggregate has deteriorated, particularly at the top of the ramp where
> there is a lot of torque from the front wheels of the trucks. There has
> been erosion due to run-off. Large sections of the ramp now resemble an
> English muffin.
> I am thinking about removing the top 3/4 in. of the slab and replacing it
> with an overlay. The options I am considering are: latex modified
> (styrene butadiene), epoxy-modified concrete or a mix with silica fume.
> One consideration is waterproofing - part of the ramp is in a
> area with very high (>100%) humidity. Another consideration is minimum
> thickness, we cannot remove very much of the existing slab since there
> post-tensioning cables in the longitudinal direction.
> Any ideas about relative advantages/disadvantages of these three systems
> would be appreciated. Relative costs would also be somewhat of interest
> are less of an issue than durability.
> Gail Kelley
* This email was sent to you via Structural Engineers
* Association of Southern California (SEAOSC) server. To
* subscribe (no fee) or UnSubscribe, please go to:
* Questions to seaint-ad(--nospam--at)seaint.org. Remember, any email you
* send to the list is public domain and may be re-posted
* without your permission. Make sure you visit our web
* site at: http://www.seaint.org