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Behaviour of high performance fibre reinforced concrete layered beams

Author: 
Srinivas, H. R. and Dr. Sadath Ali Khan Zai
Subject Area: 
Physical Sciences and Engineering
Abstract: 

The Layered reinforced cement concrete beams can be analyzed using conventional methods for composite element consisting of fibre reinforced high performance concrete (FRHPC) and Normal strength concrete (NSC) to improve the efficiency of concrete matrix of different layered flexural member. A beam is a flexural member which provides support to the slab and vertical walls, as flexural members plays an important role in the structural system hence specific attention has been given to study affect of different concrete matrix in the form different concrete layers on behavior of flexural member under static loading. In reinforced cement concrete beam generally consists of two zones i.e., compression zone at top and tension zone at bottom. As concrete is weak in tension, steel is introduced in the tension zone to take up the tension, but as strength of concrete is ignored in tension zone with respect to compression zone. As the concrete in the tension zone of the section contributes little to the beam load bearing capacity. Hence in the present experimental investigation the tension layer is made of normal strength concrete while the compression layer is made of fibre reinforced high performance concrete and also combination of both. The possibility of such scheme is practical a new innovative construction technology so a higher concrete strength is required in the beam's compression zone to withstand rather large bending moments under serviceability. The research is aimed at experimental investigation focused on two layered as well as three layered test beams specimens consisting of High Performance Fibre Reinforced Concrete (HPFRC) and Normal Strength Concrete (NSC) in tension zone with varying depth to optimize and to improve the efficiency of layered concrete matrix (HPFRC and NSC) consisting of following grades of concrete with layered as M20, M60, M60/M20, M60/M20/M60 to study energy absorption capacity, toughness, ductility index, cracking moment and consequently load carrying capacities of layered test beam specimens from Load-deflection curve to assess the enhancement in flexural strength and same is to be optimized with minimum use of FRHPC for layered beam concept.

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