Here's the deal. I have a ceement pond with concrete deck surrounding it. (see pictures below). I am in the process of cleaning and staining it all which is working out fine. My problem is the gaps between each slab. This is an old pool and the gaps are about 1.75" wide and formerly had wood in them that rotted long ago. No idea what kind of wood it was. The dept of each gap is about 2" deep. If I put a 2X4 inside there is lots of slop to the sides and not consistent. Pool places don't have anything to put in as they use smaller gaps now. My thoughts originally to maybe use river pebbles embedded in quikrete but after staining realized they color would be all wrong. Now I'm thinking of tile, possibly sized to fit or maybe tile pieces kind of like mosaic. I am headed towards a Mediterranean/Italian/Spanish look (in theory). I know you normally need expansion joints but how important is that given the age (and other cracks I am not fixing) of the concrete.
Any thoughts or suggestions or other ideas?
(1st attempt lost in data crash)