Cameron - a couple of questions.
1. If a "glassy" type material were to be used as aggregate, like the flint chippings I mentioned a couple of pages back, would not this avoid at least one problem, the ingress of any air into the aggregate surface ?
2. The point about the 30 micron(?) layer of epoxy around each particle as the desirable thickness for maximizing strength.
If the individual particles are all irregular, in fact any shape other than cuboids, the layer must vary in thickness from possibly zero(if they are actually touching at any point) to some macro value depending on their irregularity.
Unless of course this layer is to be achieved by pre-coating the aggregate particles.
Also, a consideration of the effect of introducing particles smaller than this threshhold seems to me to not affect the issue.
I feel that this is one consideration in the long list that we are looking at that has little value other than as a theoretical notion.
Or have I missed something important with this particular topic ?
Regards
John
It's like doing jigsaw puzzles in the dark.
Enjoy today's problems, for tomorrow's may be worse.