Had to cut out a section of concrete in my pool deck to fix a return line leak. Finally getting around to permanently closing the hole. Partly for the fun of it and partly to "cover up" what would just be an ugly square of different concrete, we are planning to put a nice, big, tile sea-turtle into the concrete patch.
It is porcelain tile, multiple pieces on a backing. My initial plan was to just use plain concrete with no aggregate so it would fill in all of the space between the individual tiles. But I'm worried that the concrete (after setting) might expand in the heat and crack the tiles, which led me to think that maybe I should use grout.
Any advice from concrete/tile folks here?