Self-Monitoring of Reinforced Concrete Beam Bending with Carbon Nanofiber Polyurethane Composite

Table 8

Physical parameters of carbon nanofibers.

Purity	Diameter	Length	Draw ratio	Resistivity	Specific surface area	Stacking density
99.9%	150–200 nm	10–20 μm	70	6 × 10^−6 Ω·m	300 m^2/g	0.18 g/cm^3