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
UPGRADING COMPRESSIVE STRENGTH OF CONCRETE COLUMN USING FIBER REINFORCED POLYMER Rushikesh D. Hingmire [1], Samadhan D. Sawant [2], Prof.R.B. Ghogare[3] Mansi R. Kadam[4] [1], [2], [4] [3]
BE Student (BE-Civil Engineering)
Professor (BE-Civil Engineering Department)
[1][2][3][4] S.B.Patil College Of Engineering , Indapur , Maharashtra [India] ---------------------------------------------------------------------***--------------------------------------------------------------------Abstract1.1 General
The use of externally wrapped fiber-reinforced polymers (FRP) has become very much popular for civil engineering applications. The Carbon fiber reinforced polymer has significantly increased the strength and ductility of concrete by forming perfect adhesive bond between concrete and the wrapping material. The main objective of this project is to study the effect of reinforced concrete column wrapped with FRPC on split or indirect tensile strength and compressive strength parameter. The experiment will includes number of concrete specimens which will consist of unwrapped and wrapped column .The study will be establish through the results in terms of compressive and tensile strength. The results will show that for concrete specimens the CFRP increase the compressive strength when compared to unwrapped concrete column.
Keywords: Carbon Fiber Reinforced Polymer, Ductility, Concrete Column , Split Tensile Strength, Compressive Strength.
1. INTRODUCTION Throughout the world many reinforced concrete structures such as bridges and buildings have worsen and became weak to such a degree that strengthening such structures or reducing the load on them is becoming important to increase their life. In the past, various methods have been used to supporting bridges and other types of structures. Traditionally, structural repairing or restrengthening has been accomplished by methods such as introducing additional beams to the structure or by strengthening existing beams with externally post-pensioned cables. In recent years, mechanical attachment of steel plates placed around the inadequate member has been developed to repair many structures. The use of such technique to provide lateral strengthening to the concrete in compression have been studied extensively, and have shown to increase the compression, load carrying capacity and ductility of the concrete columns. However, the use of steel plates has many disadvantages, such as corrosion, difficulty in handling the plates, deterioration of the bond at the steel–concrete interface and the requirement of massive scaffolding during installation. © 2022, IRJET
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Fibers Fibers occupy the largest part in a FRPC and bear the major amount of the load acting on a composite structure. The reinforcing fibers can be arranged during fabrication; thus composites can be made to meet increased load demands in specific directions. The major fibers in use today are glass, carbon (graphite), and aramid. A)Glass Fiber-Glass fiber is the most common fiber used in FRPCs because its low cost, high strength, high chemical resistance, and good insulating properties. Despite being widely used in marine applications, glass fiber is subjected to strength loss under moisture and load. The main types are Eglass (also called “fiberglass”) and S-glass. The E in E-glass stands for electrical as it was originally designed for electrical application. However, it is used for many other purposes now such as decoration and structural application. The S in S-glass stands for higher contents of silica. It retains its strength at higher temperature and has higher fatigue strength, but it is more expensive than E-glass. The glass fibers are usually used for confinement of columns and for improvement in ductility. B)Carbon (graphite) Fiber-Carbon/graphite fibers have very high specific stiffness, specific ultimate strength and high fatigue strength. Another very unique advantage of carbon fibers is the very low and negative coefficient of thermal expansion. That is why a graphite/epoxy composite can have a very low Coefficient of thermal expansion. The disadvantages include very high cost (10 times of glass fibers), low impact resistance and high electric conductivity. Differences between carbon fiber and graphite fiber are in the carbon content (93%-95% versus >99%) and in the required manufacturing temperature (1300°C versus 1900°C). C)Aramid Fiber (Kevlar)-Aramid fiber (Kevlar) is a kind of polymer made of carbon, hydrogen, oxygen, and nitrogen. Its advantages are low density, high tensile strength, low cost, and high impact resistance. However, its compressive strength is only about 20% of the tensile strength. Hence , composites containing aramid fibers are not recommended for structural applications involving high compressive loads. ISO 9001:2008 Certified Journal
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