The problem with Muriatic Acid is that of off gasses and has the potential
to cause any steel objects in the area to start rusting. If you use
Muriatic, use PPE, seal the area and ventilate extremely well.
If you just need to open up the pores of the concrete to get some bite
mechanical means would be best.
Also, I have used a water based epoxy to bond between new and old concrete.
It worked well.
Jack
-----Original Message-----
From: shop-talk-bounces@autox.team.net
[mailto:shop-talk-bounces@autox.team.net] On Behalf Of Karl Vacek
Sent: Sunday, April 24, 2011 5:54 AM
To: 'Scott Hall'; 'Shop Talk List'
Subject: Re: [Shop-talk] CSP 3 (ICRI) (moderately not OT)
What about etching with something like muriatic (hydrochloric) acid to give
the surface some tooth ? Phosphoric is also used for etching and cleaning
concrete. With that and a binder, as Nick suggested, you should have good
adhesion between the old and new concrete.
Karl
-----Original Message-----
From: Scott Hall
Subject: Re: [Shop-talk] CSP 3 (ICRI) (moderately not OT)
<snip>
"Concrete surfaces must be mechanically profiled and prepared by
shotblasting, sandblasting, water-jetting, scarifying, diamond-grinding or
other engineeredapproved methods (reference ICRI CSP 3 standards for
acceptable profile height)."
Which I really can't do--it's a 5' by 5' space in an occupied house <snip>
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