Concrete is the combination of cement, rock, sand, and water mixed in the proper proportions. This mix is then placed in forms, with a reinforcement system. There are several reasons that concrete may need to be repaired. This could be from support bars that are rusting, the use of winter salts, freeze and thaw, or improper finishing. A quick investigation can be done to assess what caused the damage to the concrete, with this information, the proper concrete repair can be determined.