Prepare the crack for repair as with a horizontal crack (step 1, above) and then fill the crack with fast-setting repair mortar. The mixture should have a fairly dry consistency so it does not run out of the crack. Overfill the crack slightly and allow the repair material to set up.
Shape or trim the concrete repair product so it is even with surrounding surface and the textures match. If the material has set too much and is difficult to work, try using a wire attachment on a power drill.