Page 326 - Installation Training Binder FIT1-3

Step 1

Surface Preparation

New Concrete: (Option 1a)

Concrete surfaces that have been contaminated with forms of oil or
grease must be chemically cleaned or scarified to remove these
contaminants before abrasive blasting; hydro-blasting, scarifying or rotary
shot blasting is started.

Suitably prepared concrete must have curing compounds removed and a
uniform surface texture similar to 40 - 60 grit sandpaper. If surface texture
is not uniform in appearance, repeat surface preparation procedure until
the desired surface is obtained.

Remove all sand, dust or loosely bonded debris caused by mechanical
cleaning by thoroughly vacuuming the area. If hydro-blasting is used, the
substrate must be surface dry prior to application of corrosion-resistant
floor coating.

Existing Concrete: (Option 1b)

Prior to application of the corrosion-resistant floor coating, old concrete
must be examined to see that it is free of loose particles, oils, grease,
chemical contaminants and previously applied paints or protective
coatings. Chemical cleaning or mechanical scarifiers can be used to
remove such surface contaminants.

• Concrete contaminated with acids, oils, grease or fats: Spread powdered
soda ash or trisodium phosphate on the surface and wet down with warm
water. Scrub surfaces vigorously with power scrubber or steel bristle brushes
to remove all loose cement and/or aggregate. Allow to stand 10 minutes.
Flush with clean water and check pH. Repeat this procedure if necessary
until a slightly alkaline surface is obtained. (A pH between 7 and 12 is ideal).
Dry thoroughly.

• Concrete contaminated with alkalis: Remove excess alkalis by steam
cleaning or flushing with high-pressure water. Scrub surface with a strong
commercial detergent using 1 pound per gallon of warm water. Use power
scrubber or steel bristles to remove all loose cement and/or aggregate. Flush
with clean water. Dry thoroughly.

After the concrete has been treated in this manner, follow the
recommended surface preparation procedures described under New
Concrete section above. All concrete to receive the corrosion-resistant
floor coating must be surface dry and free of contaminants that would
affect the bond of the corrosion-resistant floor coating to the concrete.

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11/2007 rev. B Condor System Setup Instructions Page - 6 -