Fascinating-I’ve had several conversations with the contractor I work with about Roman concrete-we would like to make some of it, but volcanic tuff and ash are in rather short supply here...
I imagine that there are good sources of ash closer than you think, and tuff is all over as well. Tuff is simply consolidated volcanic ash. It’s usually a soft rock, easily worked.
Of course, environmentalists would scream about digging out even something as common and worthless as volcanic ash. They make enough noise about digging out sand for glass, even.
Since this is actually related to (what else?) the global warming hoax, it is only a matter of time before the Roman concrete ingredients are not only available, but required, all over the world.
That’s a pozzolanic mixture, IIRC, and the ingredients used to be sold by coal-burining utility companies. Chemically speaking, however, coal, seems to be incompatible with Indonesian homosexuals.
I imagine that a lot of volcanic ash is available in Washington State (Mt. St. Helens). I know that they make very pretty art glass there from some of the minerals that were spewed about during the 1980s eruption when the top of the mountain blew off.
I was watching a program on either the Smithsonian Channel or one of the History channels the other week, and they stated, during a discussion of Roman concrete, that one of the ingredients in their underwater concrete was a fairly large quantity of animal blood. I’m not sure how it works, but it was supposed to allow the concrete to harden under water. They built a harbor at Cesarea with it. I asked my son, who has a PhD in Materials Engineering, and he didn’t know what properties blood would bring to the mix.