> Not really. From a macro engineering perspective all of the current research in carbon nanotubes for structural use is aimed at producing longer tubes, often referred to as carbon nanotube fibers. Nanotube fibers that are long enough to be used in the same way as carbon fiber, or glass fiber, woven together and bound in a matrix to produce strong macro scale materials. > > ALL current carbon fiber use in concrete is mechanical and exactly equivalent to how glass fibers are used. Except that the carbon nanotubes are far smaller so although they provide stronger local support the scale of the cracking they prevent is reduced vs other fiber mix-ins.

This is absolutely 100% false and if you just browse the ACI YouTube channel you will find a whole ton of research of nano-scale carbon. The goal is NOT to make it micro or macro scale because the nano scale provides unique benefits.

It is incredibly different from how glass fibers are used and I recommend you educate yourself on the subject or else just stop talking down about a new technology you are unfamiliar with.

Again, carbon fiber and carbon nanotubes are very different materials.