Effect of Hybrid Fibers on the Mechanical Properties of High Strength Concrete
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Abstract
In this study, high strength concrete of 75 MPa compressive strength was investigated. The
experimental program was designed to study the effect of fibers and hybrid fibers (steel and
polypropylene fibers) on the fresh (workability and wet density) and hardened properties
(compressive strength, splitting strength, flexural strength and dry density) of high strength
concrete. Results show that decreases in slump flow of all concrete mixtures containing steel,
polypropylene and hybrid fibers compared with control mix (0% fiber). Hybrid high strength
concrete with steel and polypropylene fibers showed superior compressive, splitting, flexural
strengths over the others concrete without or with single fibers content. The test results
indicate that the maximum increase in compressive and flexural strengths are obtains with the
hybridization ratio (70%steel + 30% polypropylene) and were equal to 14.54% and 23.34%
respectively, compared with the control mix. While, the maximum increase in splitting tensile
strength with (100% steel fiber + 0 polypropylene) is 21.19%.
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