الفهرس 
Problem of statementOnly 14 pages are availabe for public view
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Abstract
High performance concrete (HPC) has become a very famous material due to its improved performances under both static and dynamic loads. Fiber reinforced concrete (FRC) is a composite material essentially consisting of concrete reinforced by random placement of short, discontinuous and discrete fine fibers of specific geometry. Fibers have extensively been used to improve the ductility of concrete. In buildings, the used construction materials are usually subjected to different kind of stresses as well as different environmental exposure conditions. Fire represents one of the most severe environmental conditions. Even though concrete is good against fire loads, concrete subjected to temperature above 500°C significantly loses the strength and affects the durability of structures. There is an urgent need to study and understand the behavior of HPC after exposure to fire. The experimental investigation was carried out on the mechanical properties; compressive strength, splitting tensile strength and flexural strength of HPC after exposure to fire flame and exposure to different cooling regimes. Moreover, HPC-RC beams were cast and tested to investigate the behavior of HPC after exposure to fire flame and exposure to different cooling regimes. The load deflection relationships, strain distribution, crack pattern and moment curvature relationships were recorded to investigate the flexural performance of HPC. On the other hand, HPC-RC beams were investigated experimentally the effectiveness of ferrocement for strengthening the beams after exposure to fire. All the beam specimens were subjected to pure bending up to failure; the test was applied on the reference beams after 28 day from casting date and applied on the repaired beams after 28 day from the date of applying the mortar (matrix).