Flexural Behavior of Flat-End Steel-Fiber-Reinforced Concrete

Abstract

This research focused on modeling the first-crack load as a function of steel-fiber fraction to optimize the steel-fiber fraction through load-deflection response and flexural behavior of steel-fiber-reinforced concrete (SFRC). Specifically, this study involved an experimental method to examine simultaneous flexural load-deflection response measurements on normal portland cement concrete and steel-fiber-reinforced concrete. Other basic tests were addressed to characterize fresh mix and constituent material properties. Regression models were developed to predict the following: (1) first-net deflection; (2) net deflection at any applied load; and (3) first-crack load at different mix combinations of steel fiber. Results from this investigation showed that in the flexural load-deflection response tests, SFRC beams experienced an increase in first-crack net deflection. In addition, Inclusion of steel fiber at 0.64% by volume of concrete did not cause a significant change in the first-crack strength.