Abstract
In this study, high strength concrete of 75 MPa compressive strength was investigated. Theexperimental program was designed to study the effect of fibers and hybrid fibers (steel andpolypropylene fibers) on the fresh (workability and wet density) and hardened properties(compressive strength, splitting strength, flexural strength and dry density) of high strengthconcrete. 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 strengthconcrete with steel and polypropylene fibers showed superior compressive, splitting, flexuralstrengths over the others concrete without or with single fibers content. The test resultsindicate that the maximum increase in compressive and flexural strengths are obtains with thehybridization 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 tensilestrength with (100% steel fiber + 0 polypropylene) is 21.19%.
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