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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