| 요약2 |
In this study, 25 concrete specimens were tested to investigate the variations of shear strength characteristics of high-strength concrete beams due to amount of recycled coarse aggregates replaced, and to investigate the effect of steel-fiber reinforcement on concrete using recycled coarse aggregates. The variables of specimens were replacement ratios of recycled coarse aggregates, 30%, 60%, 100%, of total coarse aggregates and steel-fiber reinforcement. Test results showed that the shear strength deterioration was not proportioned to replacement ratios of recycled aggregates, the shear strength falled rapidly at 30% of replacement ratio so far as 34% of strength reduction ratio, but after that it falled a little within 3% up to the replacement ratio 100%, and steel-fiber reinforcement of 0.75% of concrete volumn recovered completely the deteriorated shear strength and shear elastic modulas, moreover improved the shear strength above 50% rather than that of the high-strength concrete using natural coarse aggregates. |