Preparation is the key to patching. Remove all loose material with a wire brush. Then rinse with water to get rid of dust and to dampen the old concrete so it won’t suck moisture from the patching compound. Brace a form board against the step riser so the top is level with the tread. Apply the mortar with a pointed trowel. When the patch firms, but before it dries completely, remove the form and finish the surface to match the surrounding area. Round off the corner to make it more durable.

If the patch is more than two inches thick, drill 1/2×2-inch holes in the step and set 1/4×4-inch bolts in mortar in the holes to anchor the patch.
Let the patch cure before walking on it.
Many packaged patching compounds are quick-curing and offer improved bonding strength. These include both epoxy and latex formulations.

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