Contribution of Hybrid Fibers on the Properties of High Strength Concrete Having High Workability

Abstract

The hybridization of different types of fibers may play important roles in arresting cracks and thus achieve high performance of concrete. Therefore, this study was conducted to investigate the use of different percentages of steel fiber (0, 1.0, 1.25, 1.5, 1.75 & 2%) as vol. %. Consequently, the hybridization of the steel fiber and palm fiber as 2% volumetric fractions on the high strength concrete was applied and determine the density, compressive strength, flexural strength and toughness indices for all the mixes. The results show that the use of 1.0% of steel fibers increases the compressive strength by about 13%. The hybrid fibers can be considered as a promising concept and the replacement of a portion of steel fiber with palm fiber can significantly reduce the density, enhance the flexural strength and toughness. The results also indicates that the use of hybrid fiber (1.5% steel fiber+0.5% palm fiber) in specimens increases significantly the toughness indices and thus the use of hybrid fiber combinations in reinforced concrete would enhance their flexural toughness & rigidity and enhance their overall performances.