Hi js412000.
While it is true that concrete has been touched on in the E/G thread, and possibly others, I wouldn't go so far as to say it's been covered.
With the coming spring, and planning to do quite a bit of concrete work in the garden, I don't think SWMBO will notice that I am also going to cast up a few experimental components.
One of my own ideas for reduction of the epoxy used was to glue together well matured concrete slabs as a way of getting round the slow shrinking with time that occurs with Portland cements. Other problems require other solutions, but I'm sure that some combination of these quite dissimilar materials might well produce a workable and useful result.
John