If you have concrete steps that are damaged, it is important to repair them as soon as possible. Clean the step surfaces of any wax, grease, or loose contaminants and then mix the repair mortar with water. Spread the mortar over the step with a brush, using a smoothing trowel and a sponge to finish. Loose cement or dust will damage the bond between the new cement and the old step. If your concrete steps have chipped nosings or corners, you can repair them by first cleaning the area and then sculpting a replacement section with cement and a margin trowel.
While the mass filler is still wet, place more concrete with the margin trowel and set it in place. With a brush, apply a generous amount of concrete adhesive to the damaged area of the step. Be careful when pressure washing your concrete stairs as the impact of the water can further damage your steps. You may want to contact a professional for your project if the damage to the concrete steps is extensive or if it extends deep into the structure of the steps. Also, when dealing with a material that lasts as long as concrete does, over the years you will find yourself with more than one maintenance occasion. Once you've fixed any visible gaps, use a level to make sure the top and sides of your new concrete step are straight and level.
If you are trying to repair the joints, you can use a different approach with rebar and self-levelling products. Be sure to press the mix into the deeper cracks to avoid air bubbles that will cause you to repair the step again sooner than you would like. Structural repairs are more demanding than cosmetic ones, and badly damaged concrete requires a particularly high level of effort. For one thing, the structural problems with concrete only get worse, especially with each passing winter, until the installation deteriorates so badly that it has to be completely replaced. Allow one day for repair and half a day for painting the steps to make them uniform after the concrete has cured.