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Repairing Cracks in Concrete
Shifting soils will cause concrete patios, steps and driveways to crack. Luckily, most surface defects and hairline cracks can be repaired with a thin overlay of cement stucco or mall-aggregate concrete, says Tim Carter, builder/remodeler and founder of AskTheBuilder.com. For concrete that's severely cracked, missing chunks or at different heights, he recommends replacing with steel-reinforced concrete that's a minimum of 4,000 PSI strength.