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Experimental Investigation on Hybrid Fibre (Steel Fiber and Polypropylene Fiber) Reinforced Self Compacting Composite Concrete members

S. Arivalagan

Abstract


C o ncrete is acknowledged to be a relatively brittle material when subjected to normal stresses and impact
loads, where tensile strength is only approximately one tenth of its compressive strength. As a result of these
characteristics, concrete member could not support such loads and stresses that usually take place, mainly on
concrete beams and slabs. And also Concrete is poor in ductile property. Thus concrete structures subjected to
dynamic forces such as earthquakes and blast forces, fail without giving sufficient warning as they are not able to
absorb energy .Concrete member reinforced with continuous reinforcing bars to withstand tensile stresses and
compensate for the lack of ductility and strength. In congested reinforcements self compacting plays a major role.
The introduction of fibers, a new form of binder that could combine Portland cement in the bonding with cement
matrices was brought in as a solution to develop concrete in view of enhancing its flexural and tensile strength.
Fibers are generally used in one of two forms - short staple randomly dispersed in the cementitious matrix of a bulk
structure, or continuous mesh used in thin sheets. In recent years, some attempts to weave synthetic fibers into
three-dimensional reinforcements have been made .The principal aim of the study is adding the steel fibre and poly
propylene fibre to the self compacting concrete at a dosage of 1.0% by volume of concrete and to study its behavior
and mechanical properties in fresh and hardened stage. For this study, casting of 9 cubes, cylinder and beams for
controlled concrete and 27 Cubes, Cylinder and Beams with Fibers(steel and polypropylene) M30 grade concrete are
used for study. From the study, it was observed that fibers considerably increase the tensile strength and flexural
strength with 1% addition. Also the self compacting concrete with steel and polypropylene fiber posses the
properties of self compacting concrete. The tests were done at an age of 7 days and 28 days. Results are compared
for above tests.

Keywords


Hybrid fibre, Steel fiber , Polypropylene fiber , Self-Compacting Concrete.

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