Structural performance evaluation of steel fiber reinforced concrete beams with recycled aggregates

摘要

In this study, a research work conducted to utilize a large amount of recycled aggregates. It added steel fiber, as reinforcement, to a beam with recycled aggregates converted from natural aggregates in order to increase its shear performance. The main variables here are recycled fine aggregate replacement ratios and steel fiber volume fractions. After the experimental test, test results and shear strength of the reinforced beam were evaluated. With the help of the test, it could confirm that the strength and deformation capacity of beams with the steel fiber content values of 0.5% and 0.75% are comprehensively enhanced compared to those with the steel fiber content value of 0.0%. It was evaluated that the enhancement of strength and deformation capacity of the beams with the recycled fine aggregate replacement ratio of 50% was insufficient compared to those with natural aggregates. After evaluating the strength of the specimens using shear strength equations of previous researches, it concluded that the strength equation of Ashour and Oh underestimated the effect of steel fiber strengthening; however, it is able to predict the shear strength of beams on the safety side. The supplementation for the mix design and method considering steel fiber as a binding material may be necessary in the future.