I am currently make an attempt to make miniaturized version of this China's solar highway on my garage
Just so i can re-evaluate the performance
However, I am curious with the top-most layer. In various online media source it keeps saying "transparent concrete" (which obviously 100% transparent) while i found none information on the web how to create one (not even scientific paper)
What i got so far is the "translucent" version, using fiber optics. But it's not that "transparent" as you can see in video above..
My best guess its not concrete at all (although many well-known media source said so), possibly kind of plastic (polycarbonate or sort)...
What do you think? Is it possible to make concrete of that kind?