Page 350 - Installation Training Binder FIT1-3

Preliminary Inspection

Before any coating is begun, the concrete should be inspected to see that
the following has been reached.

• New concrete has a minimum 28-day cure with no curing agents or sealers
applied unless approved by Enviroguard.

• Concrete surfaces pass ASTM 04263-83 indicating moisture in concrete by
plastic sheet method.

• All oil, grease, paint, wax, weak and powdery concrete have been removed.

• No other conditions exist which would shorten the expected life of the applied
coatings.

Surface Preparation

New Concrete

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, hydroblasting, 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 hydroblasting is used, the
substrate must be surface dry prior to application of corrosion-resistant
floor coating.

Old Concrete

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.

91-101 Rev. C 03/07