- 1). Make the gap wider at the base with a chisel and hammer. This way the filler will be held in place by the surface of the sidewalk.
- 2). Remove the debris and dirt from the gap with a wire brush.
- 3). Fill the gap with sand until it is 1/2 inch below the surface.
- 4). Mix a fortified sand-mix concrete in a bucket with water by following the manufacturer's instructions. Add a concrete fortifier into the concrete and sand mixture according to the manufacturer's recommendations.
- 5). Fill the gap by applying the mixture over the sand with a trowel. Feather the surface of the gap so it is flush with the rest of the sidewalk. Let dry.
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