International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395-0056
Volume: 12 Issue: 09 | Sep 2025
p-ISSN: 2395-0072
www.irjet.net
A STUDY ON STRENGTH PARAMETRS OF FIBRE- REINFORCED CONCRETE USING POLYPROPYLENE FIBRE AND STEEL FIBER BATTULA SUMANTH GOUD1, Dr. D. SREEHARI RAO2 1
PG Student, Department of Civil Engineering, Sri Venkateswara University College of Engineering, Tirupati, Andhra Pradesh, India. 2 Asst. Professor, Department of Civil Engineering Sri Venkateswara University College of Engineering, Tirupati, Andhra Pradesh, India. ---------------------------------------------------------------------***--------------------------------------------------------------------Abstract - Among all the construction materials that are available for construction, we know that concrete is a widely used construction material for building of various civil engineering structures. Concrete will give better durability and also its costs during construction as well as maintenance are very low when compared to other construction materials. As we know that concrete is strong in compression and weak in tension and tends to fail because of its deficiencies such as low tensile strength, low strain at fracture. The weakness of concrete is due to the presence of micro cracks at mortar aggregate interface. To overcome the existing problems addition of fibres in the concrete has been come in to practice. In fibre reinforced concrete, the fibres are added to the concrete mix so that these discontinuous fibres will be uniformly distributed in the mix and improve the concrete properties in all directions. To get more improvement in the mechanical properties. In present experimental work M30 grade of concrete mix was used. Mix design was calculated according to IS 10262:2019. Five different proportions of polypropylene fibres were added along with concrete ingredients. The proportions of fibres were added ratio i.e. 0%, 0.5%, 1.0%, 1.5% and 2%. Polypropylene fibres were added by weight replacement of cement. Concrete was tested in fresh state as well as in hardened state with all five different mix proportions of fibres. Fresh properties like workability, hardened properties like compressive strength, split tensile strength, flexural strength were assessed.
Keywords: Fiber, Polypropylene fibres,steel fibers, Compressive Strength, Split tensile Strength, Flexural Strength. INTRODUCTION Concrete is a versatile building material and is one of the oldest and most used construction materials in the world. It is mainly due to its low cost, availability, its long durability ability to sustain extreme weather environments. Due to its high strength and durability properties, it is largely used in all the sectors like multi story buildings, irrigation structures, pavements, reservoirs, foundations, dams etc. As we know that concrete is strong in compression and weak in tension and tends to fail because of its deficiencies such as low tensile strength, low strain at fracture. For improving the tensile properties of plain concrete many methods have been evolved. Many of the methods succeeded in making the concrete members resistant to tension, but none of them increased the inherent tensile properties of plain concrete. The dispersion of fibers in concrete matrix to improve its tensile properties must come into practice. The addition of small closely space and uniformly dispersed fibers to concrete would act as crack arrester and would substantially improve its static and dynamic properties. The type of concrete is known as fiber reinforced concrete. Fibers used in concrete were generally small closely spaced and uniformly dispersed. Continuous meshes, woven fabrics and long wires or rods are not considered to be discrete fibers. Fibers include steel fibers, glass fibers, synthetic fibers, and natural fibers. The weakness in tension can be overcome using sufficient weight fraction of certain fibers. To improve the mechanical properties of concrete, it is good to mix cement with fibers which have good tensile strength. Adding fibers to concrete greatly increases the toughness of material. The fibers also alter the behavior of the fiber matrix composite after it has cracked, thereby improves its toughness.
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