30 years ago they tried this with asphalt.
It did not work very well.
I remember that. The roads started burning and smoking.
Adding a ductile material to the matrix of a material whose hallmark is compressive strength and rigidity seems not very smart. Seems to be a lot of not very smart going around these days.
Asphalt would not survive unreinforced if it were not somewhat ductile.
I wonder what those “rubber” inclusions do for spalling, freeze resistance, permeability, bonding, development length of steel and other things we always were concerned about with concrete.
The whole experiment sounds like reinventing the wheel by a bunch of somewhat educated fools and tools.
Spent asphalt has been heavily recycled for many years in making new asphalt. It's excellent for reuse into new pavement duty.
Oil refinery trivia…. Asphalt oil is the heavy residual oil remaining after all the good stuff has been stripped and distilled from the crude oil. The only thing lousier than asphalt oil are the slop oils removed from water at the front end of the wastewater treatment plant. This slop oil is the feed to the Coker Unit, that uses steam and temperature to yield petroleum coke. The coke product has a high energy content and supplements coal as a fuel.