Introduction
Fiber-reinforced concrete is a composite material consisting of concrete and agitated fibers such as steel fiber, glass fiber, synthetic fiber and natural fiber that increase the flexural strength, tensile strength, shear strength, impact strength and bond strength. Fiber-reinforced concrete has been used in construction since the early 1900s and is now widely used in bridge construction, pavements, resurfacing of roads, repairs, asbestos roof replacement and rehabilitation of existing structures.
Historical Background
Fiber-reinforced concrete was first developed in the early 1900s. It was developed to improve the strength and durability of concrete structures. In the 1950s, fiber-reinforced concrete was further developed for use in bridge foundations and other civil structures. It has since been used for a variety of applications, including pavements and repair of existing structures.
Types of Fibers
There are four main types of fibers used in fiber-reinforced concrete - steel fibers, glass fibers, synthetic fibers and natural fibers. Steel fibers are the most common type of fiber and are used most often in bridge foundations, repairs and resurfacing of roads. Glass fibers are used for concrete reinforcement, as they are ductile and elastic, and absorb more energy than steel fibers. Synthetic fibers are widely used in construction due to their strength and durability. Natural fibers are used mostly in repair and rehabilitation of existing structures.
Advantages
Fiber-reinforced concrete has several advantages over traditional concrete. Fiber-reinforced concrete is more flexible than traditional concrete, which allows for greater movement in concrete structures. It has higher tensile strength and better compressive strength than traditional concrete. It is also more resistant to cracking, spalling and other types of surface deterioration. Additionally, fiber-reinforced concrete is easier to work with than traditional concrete.
Disadvantages
Though fiber-reinforced concrete has many advantages, it also has some disadvantages. The fibers used in fiber-reinforced concrete can reduce the workability of the concrete, making it harder to place, pour and finish. Additionally, high concentrations of fibers can reduce the strength of the concrete. Lastly, if not done properly, the addition of fibers can also cause the concrete to have an unsatisfactory aesthetic appearance.
Conclusion
Fiber-reinforced concrete has many advantages that make it a desirable material for construction. It is more flexible, has higher tensile strength and better compressive strength than traditional concrete, and is more resistant to cracking and spalling. It is also easier to work with than traditional concrete. Though there are some disadvantages to using fiber-reinforced concrete, its many advantages make it a desirable material for construction.
