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9. Square off the edges of the broken step with a masonry blade. Chip out loose and weak concrete with a cold chisel.
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10. Anchor a form board against the side of the step, moisten the area and pack in the repair mix. Screed off the excess patching material.
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11. Slide an edging tool along the step edge to round it. Use the edging tool only if the old step portion has a rounded edge.