You CAN resurface concrete.
More Info: As long as your concrete is in good condition to begin with, it can be resurfaced. Minor cracks can be repaired prior to resurfacing but if the concrete is not stable and has suffered significant damage, it should not be resurfaced.
When NOT to Resurface
There are three conditions under which the concrete should be replaced or receive a major overhaul rather than be resurfaced.
Major Cracks: Major cracks can occur in concrete for a variety of reasons including improper installation, heavy traffic, and frost expansion.
Frost Heaves: Frost heaves are very common in northern climates where the ground continually freezes and thaws and moisture is present in the soil. A frost heave occurs when the water present below the soil’s surface freezes. The process of freezing causes water to expand and the ground and concrete upon it to upthrust and crack.
Sunken Concrete: There are many reasons why concrete will sink depending on the surface upon which it was originally poured. For concrete to soil surfaces, soil can sink for a variety a reasons including being affected by burrowing animals, natural compaction, amount of organic debris present in the soil—which will decay over time, and weather erosion.
“Resurfacing Concrete- Identifying Issues in Concrete to Know When to Resurface – The Concrete Network.” Concrete Design Ideas, Contractors and Pictures – The Concrete Network. N.p., n.d. Web. 3 Nov. 2011. http://www.concretenetwork.com/concrete/concrete_resurfacing/what_is_an_acceptable_surface.htm
“Concrete – Is It worth Fixing? – The Concrete Network.” Concrete Design Ideas, Contractors and Pictures – The Concrete Network. N.p., n.d. Web. 3 Nov. 2011. http://www.concretenetwork.com/concrete/ fixing/worthfixing.htm
“Why Concrete Sinks | MudjackAtlanta.com.” Atlanta Concrete Raising | Concrete Leveling | Pool Repair | MudjackAtlanta.com. N.p., n.d. Web. 3 Nov. 2011. <http://www.mudjackatlanta.com/concrete-crack-repair.html>.
“Frost Action and Frost Heave.” ACPA – American Concrete Pavement Association. N.p., n.d. Web. 3 Nov. 2011. <http://www.acpa.org/Concrete_Pavement/ Technical/Fundamentals/Frost.asp>