Effects of the Fibers on the Properties of High Strength Flowing Concrete

摘要

This study first investigates the optimization of different percentages of steel fiber (0-2%) and the hybridization of the steel fiber and palm fiber as 2% volumetric fractions on the high strength flowing concrete and determine the density, compressive strength, flexural strength and toughness indices for the mixes. The results show that the use of 1.0% mono steel fiber increases the compressive strength by about 10%, while the inclusion of more than 0.5% of palm fiber in hybrid fiber mixes reduces the compressive strength. 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.