New 17x More Crack Resistant Concrete Developed

https://scitechdaily.com/princeton-engineers-develop-new-cement-that-is-17x-more-crack-resistant/
. . .
This SOUNDS great ... BUT ... it is a micro-engineered
material - layers of thin concrete between films of
polymer. Preventing crack propagation is the key.
In short, it is NOT an all-purpose construction material.
At BEST, for a HIGH price, maybe some major support
columns could be made for buildings. This would be
an improvement, but not all-purpose protection.
This is yet another case of where lab results SEEM
so great, but cannot be scaled into real-world
production/products.
Hmmm ... can mixable FLAKES of polymer film be
added to traditional concrete ??? THAT would
be practical.
DO note that polymers generally are NOT "forever",
esp in alkaline environs like concrete.