RESEARCH ON HIGH STRENGTH CONCRETE REINFORCED WITH HYBRID FIBRE (KEY IJP************053)

• Gousia Qadir,Er. Rekha Devi

Abstract

One of the greatest significant and often utilised resources in the construction sector is cementitious material. These cement-based materials may be simply handled and early on, before the curing process, produced into the necessary specified shapes and structural arrangements. Nonetheless, the primary flaw in these substances made from cement is their brittleness, which is associated with their rigidity and causes cracks to form and spread when stressed. Their mechanical qualities deteriorate as a result of this weakness, requiring expensive maintenance or maybe reconstruction of such materials within a comparatively short lifespan. Therefore, the building industry needs new materials made from cement that have better endurance qualities, like increased crack resistance.Presently, a common practice in the field of concrete is the incorporation of several sub-products into materials made from cement. This study explores the viability of using metallic and natural fibers as reinforcement in high-strength concrete. Steel fiber has exceptional strength and significant possibilities for controlling cracking, despite its high volumetric density. Steel conducts in both magnetism and electrical currents, thus the amount of fibers made of steel must be reduced to a particular degree. Utilizing bio fibers such as coir and palm to create composite materials that rival synthetic composites has been more popular in recent decades because to its renewability, biodegradability, and eco-friendliness. The blend of steel and natural fibers enhances concrete characteristics and decreases the total cost of concrete manufacturing. The key benefits include impeding the creation of large fractures, slowing down the spread of small cracks to a visible level, and enhancing the flexibility when small cracks appear. The current research utilizes high-strength concrete of M50 grade with a mix ration of 1:1.38:2.88. An experiment was directed to study the behavior of a concrete beam reinforced by several natural fibers such as coir fiber, palm fiber, and metallic fiber (steel-corrugated) with an aspect ratio of 50. The fiber volume percentage is kept at 1% relative to the weight of cement. All natural fibers in the composite undergo chemical treatment to avoid decomposition. 72 cubes, 72 cylinders, and 48 flexure specimens were cast for mechanical investigations. Fourteen hybrid reinforced high-strength concrete beams were made and evaluated for first crack load, ultimate load, and maximum deflection, then compared with a control beam.The experimental data indicates that fiber reinforced concrete beams have greater ultimate moment resistance compared to conventional RC beams. applying just one fiber or a mix of multiple fiberswith varying proportions shows great potential in attractive the impact confrontation of reinforced concrete targets. The mixture of 0.5% steel, 0.25% palm, and 0.25% coir hybrid fibers exhibits the most significant enhancement in residual strength parameters. An considerable improvement in ductility and flexural toughness is reported in the hybrid fiber-reinforced concrete beam. A new approach is suggested for predicting the structural characteristics of concrete using a multilayer feedforward neural network due to limitations in current methods for handling many variables and nonlinear issues. The neural network model is constructed to represent the intricate nonlinear correlation among the inputs and the outputs. The networks in this study were trained and evaluated using different learning rates, which were then held constant after several trials. The artificial neural network's performance is evaluated using statistical error criteria, demonstrating that the ANN predicts test data more accurately.