International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395 -0056
Volume: 04 Issue: 06 | June -2017
p-ISSN: 2395-0072
www.irjet.net
A Study on Hybrid Fiber Reinforced Concrete Navilesh J1, Rahul B K2, Shankar B K3, Shivakumar Patil4, Vivekanand A Gutteder5, 2,3,4,5UG
Student, Civil engineering Dept, AIET Kalaburagi, Karnataka, India Professor, Civil engineering Dept, AIET Kalaburagi, Karnataka, India ---------------------------------------------------------------------***--------------------------------------------------------------------1Asst.
Abstract - Hybrid fiber reinforced concrete can be defined as concrete that reinforced by two or more types of fibers. This study aims to study the mechanical properties of hybrid fiber reinforced concrete where the fibers used were consists of steel fiber and coconut (coir) fiber. For this purpose five mixes, one normal control mix and four hybrid fiber reinforced concrete mixes were prepared. The volume of steel fiber is kept content as 1% and the volume of coconut fiber varied as 1%, 3%, 5% and 7% Slump Test was carried out for each mix in the fresh state in order to determine the workability of the hybrid fiber reinforced concrete. Meanwhile, compressive test, flexural test and split tensile test were carried out to study the mechanical properties of the hybrid fiber reinforced concrete. From the slump test all specimens show low workability. For the result of Compressive split tensile and Flexural Test, the normal control mix shows normal strength development but all the hybrid fiber reinforced concrete mixes gain their strength higher the normal control mix. The expected outcome which is the strength of hybrid fiber reinforced concrete is higher than the strength of normal concrete did achieved. So, further research need to be carried out with some adjustments of methods or materials. Key Words: (FRC-Fiber Reinforced Concrete, HFRCHybrid Fiber Reinforced Concrete, CFRC-Coconut Fiber Reinforced Concrete, SFRC-Steel Fiber Reinforced Concrete, PCC-Plain Cement Concrete) 1. INTRODUCTION Concrete is the most widely used man-made construction material in the world. It is obtained by mixing cementations materials, water, aggregate and sometimes admixtures in required proportions. Fresh concrete or plastic concrete is freshly mixed material which can be moulded into any shape hardens into a rock-like mass known as concrete. The hardening is because of chemical reaction between water and cement, which continues for long period leading to stronger with age. The utility and elegance as well as the durability of concrete structures, built during the first half of the last century with ordinary Portland cement (OPC) and plain round bars of mild steel, the easy availability of the constituent materials (whatever may be their qualities) of concrete and the knowledge that virtually any combination of the constituents leads to a mass of concrete have bred contempt. Cement mortar and concrete made with Portland cement is a kind of most commonly used construction material in the world. These materials have inherently brittle nature and have some dramatic disadvantages such as poor © 2017, IRJET
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deformability and weak crack resistance in the practical usage. Also their tensile strength and flexural strength is relatively low compared to their compressive strength. Fiber Reinforced Concrete is concrete containing fibrous material which increases its structural integrity. The fiber can make the failure mode more ductile by increasing its tensile strength of concrete [01]. 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. In a hybrid, two or more different types of fibers are rationally combined to produce a composite that derives benefits from each of the individual fibers and exhibits a synergistic response. The hybrid combination of metallic and non-metallic fibers can offer potential advantages in improving concrete properties as well as reducing the overall cost of concrete production. 1.1 Fiber Reinforced Concrete (FRC) Fiber reinforced concrete can be defined as a composite material consisting of mixtures of cement, mortar or concrete and discontinues, discrete, uniformly dispersed suitable fibers. And fiber is a small piece of reinforcing material possessing certain characteristics properties. They can be circular or flat the fiber is often described by the parameter aspect ratio which is ratio of fiber length to its diameter. Typical aspect ratio varies from 20 to 150. The use of fibers to reinforce a brittle material was done first by Egyptians they used straw to reinforce sun baked bricks and horsehair was used to reinforce plaster. In the early 1900’s asbestos fibers were used in concrete. The modern development of steel fiber reinforced concrete may have begun in 1960’s. Glass fibers comes into picture by the 1980’s and Carbon fibers from 1990’s. And now a day’s many types of fibers are available as a construction material and among them consumption of steel and polypropylene fibers is large. Basically fibers can be divided into following two groups (i) Fibers whose moduli are lower than the cement matrix such as cellulose, nylon, polypropylene etc. (ii) Fibers with higher moduli than the cement such as asbestos, glass, steel etc. Fibers having lower modulus of elasticity are expected to enhance strain performance whereas fibers having higher ISO 9001:2008 Certified Journal
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