Plain concrete has two major deficiencies; a low tensile strength and a low strain at fracture. The tensile strength of concrete is very low because plain concrete normally contains numerous micro cracks.
It is the rapid propagation of these micro cracks under applied stress that is responsible for the low tensile strength of the material. These deficiencies have lead to considerable research aimed at developing new approaches to modifying the brittle properties of concrete.
Fiber-reinforced concrete (FRC) is concrete containing fibrous material which increases its structural integrity.
It contains short discrete fibers that are uniformly distributed and randomly oriented. Fibers include steel fibers, glass fibers, synthetic fibers and natural fibers each of which lend varying properties to the concrete.
In addition, the character of fiber-reinforced concrete changes with varying concretes, fiber materials, geometries, distribution, orientation, and densities.
This paper presents the comparative study of effect basalt, glass and steel fibers on compressive and flexural strength of M40 grade concrete. For flexural and compressive strengthening of reinforced concrete, total thirty-nine cubes and thirty-nine beams were cast and beams were tested over an effective span of 900 mm up to failure of the beam under two-point loading.
The beams were designed as balance-section. The fibers were placed in concrete randomly by (0.25%, 0.5%, 0.75%, 1%) of its total volume of concrete. For each percentage of fiber total three cubes and three beams were casted to take average results. Finally comparative results are shown for each percentage and for these three fibers.
As per our results the maximum compressive strength is obtained for 0.5% for every fiber and among these three fibers Basalt fiber has got maximum compressive and flexural strength for 0.5%.
Ranjitsinh K. Patil (1), D. B. Kulkarni (2)
1) M. Tech (Structure) Student, Rajarambapu Institute of Technology, India.
2) Asst. Prof, Civil Department, Rajarambapu Institute of Technology, India.