Concrete has high compressive strength, stiffness, low thermal and electrical conductivity, but it lacks in tensile, flexural strength as well as structure formed is brittle and not tough. When fibers with small staple length are added to concrete, fibers precipitates through the cement slurry to create a second phase at the interface making the structure tough and flexible. The flexibility leads to energy absorption which leads to tougher system. This second phase makes the structure tougher which will act as shock absorbing zone and avoid cracking.
Concrete is the combination of dissimilar material. As in concrete, a single component is not used, so this total structure can be called as composite. When fibers with small staple length are reinforced in concrete matrix structure, the fibers precipitate through the cement slurry solution to create a second phase at the interface. This second phase makes the structure tougher. In case of vibration or heavy shocks, this second phase will act as shock absorbing zone and avoid any reflective cracking . The fiber reinforcement in building materials dates from centuries ago, and it all started with natural fibers. In ancient Egypt some 3000 years ago, clay was reinforced by straw to build walls .
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