Frequently Asked Questions
Cement & Concrete
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Concrete Floors
Q: How can I repair a pitted concrete platform
surface?
I am a contractor doing a large inside home renovation and have
been asked to repair a concrete platform outside this home. The
concrete surface is very pitted and full of surface stains. I’m
looking for recommendations on procedures and products for a skim
coat on the 20ft x 20ft concrete platform.
 A:
The two most important issues are (1) the preparation of
the slab to achieve an effective bond and (2) choosing a repair
material that is compatible with the service condition or climate.
Resurfacing Concrete
Floors, IS144 is a good resource for the preparation of
the slab surface.
In general the slab surface must be clean, hard, and all unsound
material must be removed. This will typically require high pressure
water blasting (3000 psi or more), sandblasting, or shot blasting.
The slab surface may be dry or damp but not wet prior to placing
the repair material. For a thin application, curing is most critical
to produce a durable surface.
You can use traditional concrete or mortar for the repair down
to a thickness of about 1 inch or use a thin specialty topping for
thinner sections. A list of thin specialty topping manufacturers
is available at www.concreteconstruction.net.
Use the "Search Products/Manufacturers" function and search
"toppings."
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