there is an expansion crack in our slab. It is partly filled with a rubbery substance (partially removed). In one small section the edges of the joint have crumbled. We bought an aluminium strip from a Bunnings. It has a strip down the middle to go into the joint. We glued it in place with a strong glue. Seemingly there was insufficient surface for the glue to hokd the strip in place the length of the aluminium strip. So - how to repair the hole in the expansion joint. How to stick the aluminium in place.
