Fiber Reinforced Concrete
Fiber reinforced concrete is a composite material comprised of Portland cement, aggregate, and fibers. Normal unreinforced concrete is brittle with a low tensile strength and strain capacity. The function of the irregular fibers distributed randomly is to fill the cracks in the composite. Fibers are generally utilized in concrete to manage the plastic shrink cracking and drying shrink cracking. They also lessen the permeability of concrete and therefore reduce the flow of water. Some types of fibers create greater impact, abrasion and shatter resistance in the concrete. Usually fibers do not raise the flexural concrete strength. The quantity of fibers required for a concrete mix is normally determined as a percentage of the total volume of the composite materials. The fibers are bonded to the material, and allow the fiber reinforced concrete to withstand considerable stresses during the post-cracking stage. The actual effort of the fibers is to increase the concrete toughness.
Necessity of Fiber Reinforced Concrete
- It
increases the tensile strength of the concrete.
- It
reduce the air voids and water voids the inherent porosity of gel.
- It
increases the durability of the concrete.
- Fibres such as graphite and glass
have excellent resistance to creep, while the same is not true for most
resins. Therefore, the orientation and volume of fibres have a significant
influence on the creep performance of rebars/tendons.
- Reinforced
concrete itself is a composite material, where the reinforcement acts as
the strengthening fibre and the concrete as the matrix. It is therefore
imperative that the behavior under thermal stresses for the two materials
be similar so that the differential deformations of concrete and the
reinforcement are minimized.
- It has been recognized that the
addition of small, closely spaced and uniformly dispersed fibers to
concrete would act as crack arrester and would substantially improve its
static and dynamic properties.
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