CONTROL OF BRITTLENESS OF CONCRETE WITH ELECTRIC ARC FURNACE OXIDIZING SLAG COARSE AGGREGATE DURING HEATING TO HIGH TEMPERATURES BY CONTROLLING THE REPLACEMENT RATIO OF THE AGGREGATE

Concrete using electric furnace oxidation slag as coarse aggregate (EFG) is brittle due to expansion of EFG inside the concrete upon heating. In this study, composition analysis and volumetric measurement of EFG were conducted for each heating time at 500℃, and it was found EFG doesn’t expand at heating times of 2 hours. The mechanical properties of concrete with each replacement ratio of EFG at each heating times at 500℃ were also measured, and it was found concrete with EFG replacing 20% of the coarse aggregate didn’t lose its mechanical properties even when the heating time was 4 hours.