At the micro level, there is also a very good analogy between reinforced concrete and
fiber composites. The lessons learned on fiber reinforced concrete can also be effectively
used for composites made using short discrete fibers, both at micro and nano-level. For
example, considerable amount of fiber reinforced concrete containing 0.5% of steel fibers
are being used in actual construction. The enhancement of properties provided by this
0.5% of steel fibers to concrete matrix are not that much different from the enhancement
provided by 0.5% of carbon nano-tubes in high performance composites [9-10]. Note that
carbon fibers provide enhancement to both mechanical and electrical properties.