Improving the Interfacial Bond Properties of the Carbon Fiber Coated with a Nano-SiO₂ Particle in a Cement Paste Matrix

Figure 7

Surface topography of the carbon fiber (20,000x). (a) Plain carbon fiber. (b) Nitric acid-treated carbon fiber. (c) Nano-SiO₂-coated carbon fiber.

(a)

(b)

(c)