Improvement of Structural Properties for Reinforced Concrete Deep Beam using Silica Fume with Polypropylene Fibers

Abstract

The objective of this study is to investigate the effect of silica fume and polypropylene fibers to gather on the mechanical properties of concrete and the improvement on general behaviour for deep reinforced concrete beams containing silica fume and polypropylene fibers. Properties studied include Silica fume content used was (0%, 10% and 20%) by replacement of equal weight of cement in concrete. Polypropylene fibers were added in (0%, 0.20% and 0.40%) by volume fraction of concrete. Totally three deep reinforced concrete beams specimens with cross-sectional dimension of (100X300)mmfor a length of 1000mm were tested. Out of which three beams provisional on the relation of shear span (a) to the active depth (d) .The (a/d) ratio was used (1) with different containing silica fume and polypropylene fibers with differents percentsge of replacement for silica fume and various Polypropylene fibers were addition from volume fraction.The experimental test results improved for toughened properties contain the compressive strength, splitting tensile strength and modulus of elasticity and also enhancement general behaviour for deep reinforced concrete beams when studied the crack patteren, load-deflection and strains.