Abstract
Addition of fibers in concrete significantly enhances the tensile and flexural properties of concrete. It is due to a bridging mechanism by the fibers over the crack width. Performance of fiber-reinforced concrete is significantly affected by fiber/matrix interface properties. Behavior of fibers with different concrete strengths should be well understood to achieve better performance of fiber reinforced concrete. The influence of various matrix strengths on hook ended single steel fiber is reported in this paper. Concretes with different strengths were prepared to execute the pullout test program. Test results revealed that pullout behavior is influenced by the strength of the matrix and the embedment length of fiber. Results showed that increase in total pullout energy is more prominent in increased embedment length and larger diameters of steel fibers.