CFRP rebar has been developed with a much longer lifespan. However, it is currently considered non-economical, possibly because design lifespans are not long. A

CFRP rebar has been developed with a much longer lifespan. However, it is currently considered non-economical, possibly because design lifespans are not long. Aramid FRP has been considered for rebar as well; glass fibers are attacked by cement alkali; basalt fibers have good performance dependent on the source of basalt (rocks with varying composition). One issue with a long-lived building is that you never know exactly when it will fail. 700 years down the line, it starts to crack: now what? The evolution of biological systems has strongly preferred regular replacement to longevity.