International Research Journal of Engineering and Technology (IRJET) Volume: 04 Issue: 07 | July -2017
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e-ISSN: 2395-0056 p-ISSN: 2395-0072
COMPARISON OF PERFORMANCE OF NON METALLIC FIBRE REINFORCED CONCRETE AND PLAIN CEMENT CONCRETE Madhuri M1, Jaya chandra K2 , Balakrishna Bharath B3 1PG
Student, Department of structural Engineering, Sree Rama Engineering college, Andhra pradesh, India & Principalr, Department of structural Engineering, Sree Rama Engineering college, Andhra pradesh, India 3Assisstant Professor, Department of structural Engineering, Sree Rama Engineering college, Andhra pradesh, India -------------------------------------------------------------------------***------------------------------------------------------------------------
2Professor
Abstract: If properly designed, constructed and maintained, reinforced or pre-stressed concrete structures are generally very durable. However, for structures in aggressive environment , corrosion of steel can be significant problem. Examples of structures that may be particularly at risk include marine structures, bridges subjected to de-icing salts and industrial buildings. In the last decade, there has been a considerable increase in interest in the use of non-metallic reinforcement to cope with this corrosion problem at many institution, advanced composite reinforcing materials have been developed, typically consisting of align continuous fibers embedded in resin and shaped to form beams and slabs, grid shape structures.
maintenance has got much importance than other modes of transportation. 2.FIBER REINFORCED CONCRETE Plain concrete possesses a very low tensile strength, limited ductility and little resistance to cracking. Internal micro cracks are inherently present in the concrete and its poor strength is due to the propagation of such micro cracks, eventually leading to brittle fracture of the concrete. In plain concrete and similar brittle materials, structural cracks (micro-cracks) develop even before loading, particularly due to drying shrinkage or other causes of volume change. The width of these initial cracks seldom exceeds a few microns, but their other two dimensions may be of higher magnitude. When loaded, the micro cracks propagate and open up, and owing to the effect of stress concentration, additional cracks form in places of minor defects. The structural cracks proceed slowly or by tiny jumps because they are retarded by various obstacles, change of direction in bypassing the more resistant grains in matrix. The development of such micro cracks is the main cause of inelastic deformations in concrete. It has been recognized that the addition of small, closely spaced and uniformly dispersed fibers to concrete would act as crack arrester and would substantially improve its static and dynamic properties. This type of concrete is known as Fiber Reinforced Concrete. Fiber reinforced concrete can be defined as a “composite material consisting of mixtures of cement mortar or concrete and discontinuous, discrete, uniformly dispersed suitable fibers”. The concept of using fibers as reinforcement is not new. Fibers have been used as reinforcement since ancient times. Historically, horsehair was used the concept of composite materials came into being and fiberreinforced concrete was one of the topics of interest. Once the health risks associated with asbestos were discovered, there was a need to find a replacement for the substance in concrete and other building materials. By the
Synthetic fibers used in our study are Polypropylene and Polyester. Recron Fibers are engineered micro fibers with a unique “Triangular” Cross-section, used as secondary reinforcement of Concrete. It complements Structural Steel in enhancing Concrete’s resistance to shrinkage cracking and improves mechanical properties such as Flexural / Split Tensile and transverse Strengths of Concrete along with the desired improvement in Abrasion and Impact Strengths. Compressive strength test and flexural strength tests was conducted on the cubical and beam specimens respectively for all the mixes at different curing periods as per IS 516 (1991). Three cubes of size 150 mm x 150 x 150 mm were cast and tested for compressive strength. Key Words: Fibre Reinforced Concrete, Polypropylene Fibre, Polyster Fibre, Flexural strength and Sorptivity test. 1.INTRODUCTION Transportation contributes to the economic, industrial, social and cultural development of a country. Even though there are four modes of transportation, namely, roadways, railways, waterways and airways the transportation by road is the only mode which can give maximum service to one and all. This mode has maximum flexibility for travel with reference to route, direction, time and speed of travel etc. Therefore the construction of roads and its
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