Concrete roads may undergo spalling, cracking and concrete is weak in tension and also a little ductile. so to mitigate these problems adding discrete fiber can provide a benefit to concrete pavement.
Fiber used is polyester fiber and polypropylene fiber and M25 concrete mix are used.
The fibers are aggregate with an extreme deviation in shape from the rounded smooth aggregate.
Fibers entangle and interlock around aggregate particles and considered as it reduces the workability, this the mix becomes less prone and more cohesive to segregation.
The fibers are suitable to reinforce the concrete products from glass, steel, and polymers of organic material.
Vegetable fibers and asbestos fibers that occur naturally such as jute, also usable for reinforcement.
Fibers are available in different shapes and sizes. They can be classified into two following categories. First one, those which have a higher modulus of elasticity than a concrete matrix call a hard intrusion. The second one with a lower modulus of elasticity called a soft intrusion.
The major factors that effects the characteristic features of fibre-reinforced concrete are the percentage of fibers, diameter, and length of fibers, water-cement ratio, etc.
The extent and location to create under load will depend upon the number and orientation of fibers in the cross-section.
The fibers restrain the shrinkage and creep movements of the unreinforced matrix.
However, fibers have found to be such a great effect in controlling the compressive creep than the tensile creep of the unreinforced matrix.
Fiber-reinforced concrete is applied on the refractory lining, overlays of the airfield, road explosive resistant structures, etc.
While using Glass fiber, it is used for door frames and doors, pressure piles, park benches, permanent and temporary formwork, and also bus shelters.
It is used for the fabrication of precast products like a manhole cover, boats, pipes, wall panels, beams, stair cased steps, roof panels, etc.
Fibers are usually used in concrete for controlling the cracking that occurs due to drying shrinkage and to plastic shrinkage. There are some common types of fibers that produce greater abrasion, impact, and shatter resistance in concrete. They also help to reduce the permeability of concrete and hence reduce the bleeding of water.
Fiber-reinforced concrete used in bridges. It helps to prevent catastrophic failures.
While using Fiber-reinforced concrete in civil structures, maximum corrosion can be avoided.
Fiber-reinforced concrete is a better suite to minimize the cavitation damage in structures such as navigational locks, bridges piers, sluice-ways, where high-velocity flows encounter.
the main advantage of fiber reinforced concrete is the reduction of cracking and shrinkage. Fiber reinforcement concrete can also increase tensile strength, can provide impact resistance, and helps to reduce voids in the concrete.
Runway, Pavement, and Aircraft parking: Nowadays fiber reinforcement concrete is widely used in the construction site of runways and aircraft parking. pavements of fiber reinforcement concrete are now in service in mild and severe environments.
Slope stabilization and tunnel lining: Steel fiber reinforced concrete is used to rock slope stabilization and line underground opening. It helps to eliminate the scaffolding and need for a mesh environment.
Hydraulic structures and dams: Fiber-reinforced concrete is being used for repairing dams and construction and some other hydraulic structures for providing resistance to severe erosion and cavitation that is caused by the impact of large water-born debris.
Other applications: There is also some other application of fiber-reinforced concrete that includes oil tanks, concrete repairing, water tanks, machine tool frames, lightning poles, etc.