Improvement in Compressive and Flexural Strength of Concrete by Adding Different Hybrid Fibers

Abstract

Fibers are cast-off in concrete to improve mechanical qualities and give concrete constructions superior fracture control. Environmental factors and mechanical loads work together to cause concrete to crack. When concrete structures interact with their surroundings under service load circumstances, they undergo physical and chemical changes that lead to cracking. Environmental factors cause cracks to widen and shatter into tiny fragments, which ultimately results in failure. One major issue that actually weakens concrete structures is cracking.  These fibers are short, distinct, uniformly dispersed, and oriented randomly. The following fibers can be either natural or synthetic: steel, glass, or polypropylene. Steel fiber ranges from 0.5% to 1% of the volume of concrete in this research project. Glass fiber and polypropylene fiber were added to the concrete at a volumetric %of 1% to 2%. Glass and polypropylene fibers were present in concrete at 1% to 2% by volume. 1.38:2.21 is the mix design ratio. Tests of compressive and flexural strength were performed after 28 days of cure. Reinforced concrete using steel fibers has higher compressive and flexural strengths. The most significant increase in load-carrying capability was 13% for compressive strength when the volume %of steel fiber was 0.75% of the control specimen. In contrast, flexural strength increased by up to 38% when the volume %of steel fiber in the concrete was 0.5% of the control specimen.