They lasted about four years before crumbling and were replaced with standard concrete.

About 10 years ago, I attended a lecture by Dr, Richard Riman of Rutgers University on negative carbonate concrete. He founded a company based on this, apparently named Queens Carbon which may be a successor to his other company at the time, Solidia.

It's ten years later, more or less; I recall my son was in high school, and as he was considering the career he ultimately pursued in materials science, now morphed into nuclear materials science engineering where he's publishing himself, albeit not about concrete but about printed metals.

Solidia, which we often discussed around the dinner table talking about "Riman concrete" is produced at lower temperatures than regular concrete, usually utilizing the combustion of fossil fuels, although Dr. Riman suggested getting heat and carbon dioxide from combustion of garbage.

Ten years later, neither "Riman concrete" nor Queens Carbon has saved the world.

Just out of curiosity did the paper pulled up here about saving the world with porous concrete mention my sidewalk so that anyone can tell that the sidewalk was obviously different?

I know the sidewalk rather well, having swept it and removed snow from it for decades now, lately with my swell "could be solar powered if the sun was shining through the snow clouds battery driven snow blower."

I didn't of course, object to how the sidewalk that antinukes know couldn't be made from same as kind of porous concrete that they hype was made. Nobody asked me for my opinion on the materials for the sidewalk. The contractor just showed up and put it in. If they'd asked, I probably wouldn't have objected. In fact, I thought it might be a good idea. On a little reflection however, if I knew a little science, I could probably have realized that porous concrete would have water passing through it while snow melted followed by being saturated when freezing temperatures were observed.

It's widely reported that because of hydrogen bonding, water, like plutonium, is one of those substances that expands when it freezes. If I'd thought about it I might have predicted the outcome, but I'm a dumb guy and didn't consider the point.

I'm sure the new super duper special heat resistant porous concrete has solved this problem, maybe with hydrogen powered heaters using hydrogen made in the summer by magic renewable energy.

I don't know, though, and really, I don't give a shit. It's a fucking triviality on a burning planet, not worth the carbon burned to power the computers to report how great it is.

Have a nice evening.

Right, but you care enough to criticize people who do care about the fate of the world.

Why does the name Tartuffe come to mind?