International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395-0056
Volume: 09 Issue: 05 | May 2022
p-ISSN: 2395-0072
www.irjet.net
STUDY ON HYBRID FIBRE REINFORCED CONCRETE BEAMS WITH EXTERNAL FRP LAMINATES Syed Feroze1, Mohd Mahboob Hussain Aiyaz2, Mohd Raoof Khan3, Kanchala Nanchari4 Students, Department of Civil Engineering 4 HOD Dept of Civil Engineering ISL Engineering College, Hyderabad, Telangana ---------------------------------------------------------------------***--------------------------------------------------------------------1, 2, 3 UG
Abstract - A worldwide use of high strength concrete during the last decade and an expansion in the material technology has made it possible to design concrete having superior mechanical properties and structural behavior. Whilst use of high strength concrete has accelerated, the progress in the development of revised design standards has not progressed at the same rate. Acceleration is due to its enhanced mechanical properties and better structural performance as compared to Normal Strength Concrete. Also High Strength Concrete offers economy and superior performance in terms of strength and long-term behavior. The objective of this research work is to evaluate the static response of hybrid fibre reinforced concrete beams with externally bonded GFRP laminates. Two different Glass Fibre Reinforced Polymer (GFRP) types with different thickness in each type were used. The variables considered for the study included type of GFRP laminate and thickness of GFRP laminate. The beams were 150 mm x 250 mm in crosssection and 3000 mm long. The beams were tested in four-point bending over a simple span of 2800 mm. Sufficient data will be obtained on the strength, deformation, fatigue life and failure characteristics of hybrid fibre reinforced concrete beams with GFRP laminates as well as hybrid fibre reinforced concrete beams. In addition to probing the basic properties of concrete, the present research investigation addresses three major concerns. The first is to explore the possibility of using FRP for improving the performance of hybrid fibre reinforced concrete beams. The second is to examine the enhancement in strength and deformation capacities of hybrid fibre reinforced concrete beams. The third is to evaluate the ductility of hybrid fibre reinforced concrete beams subjected to static loading conditions. Key Words: hybrid fibre reinforced concrete, static loading conditions, GFRP laminates
1. INTRODUCTION Need for the study on hybrid fibre reinforced concrete Fibre reinforced concrete used in practice is mostly with mono fibre system which provides limited enhancement of property. It has been shown recently that by using the © 2022, IRJET
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concept of hybridization with two different fibres incorporated in a cement concrete, the composite can offer more attractive engineering properties because the presence of one fibre enables more efficient utilization of the potential properties of the other fibres.
Applications of Hybrid Fibre Composites a) HYFRC composites have high ductility, greater toughness and improved tensile strength and therefore these are very well useful at Beam-Column joints in reinforced concrete structures. b) Use of high strength concrete with hybrid fibre reinforcement in beam-column joints increases the joint stiffness. c) HYFRC have greater fracture toughness and therefore they are very much useful in slab-on-grade such as driveways, ware house floors, industrial floors, gauage floors, taxiway on airports and runways subject to heavy traffic and abrasion. d) Use of High Strength Concrete with microreinforcements can be designed to resist structural stress normally found in pre-cast/tilt up applications. e) Improved shear resistance, impact resistance and energy absorption capacity of HYFRC making them potentially useful in concrete piles, machine foundations earthquake resistant structures, blast resistant structures etc.
2. EXPERIMENTAL PROGRAMME 2.1 PRELIMINARY STUDY 2.1.1 GENERAL A preliminary study was conducted to identify the optimum fibre volume fraction. For this study, 36 cubes, 36 cylinders and 36 prisms were cast and tested. The variable considered for the study included the hybrid fibre (Steel fibre-80% and Polyolefin fibre20%) volume fraction (0.5%, 1% and 1.5%).
2.1.2 DETAILS OF TEST SPECIMENS 150 x 150 x 150 mm cubes were used for determining the compressive strength of hybrid fibre reinforced concrete. 150 ISO 9001:2008 Certified Journal
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