[header] How to repair concrete steps [title] Clean the damaged portion of the concrete step. [step] Remove all loose gravel, sand, dirt, and cement with a clean, stiff wire brush. [title] Make a form. 
[step] Screw 2 short pieces of 1 inch by 6 inch (2.54 cm by 15. 24 cm) lumber together at a 90-degree angle to form an " l " shape.