UTILIZATION OF WASTE STEEL SLAG AS A SUBTITUTE FOR RUBBLE STONE IN PAVEMENT ROAD

Pavement road is an indispensable infrastructure for social, economic and cultural activities. As the second largest city in Indonesia, Surabaya needs a convenient and safe road segment to serve the activities of its society. PT Hanil Jaya Steel is one of the steel smelting factories in Surabaya which produce waste slag. The utilization of waste slag is necessary to minimize the occurrence of waste accumulation that has a negative impact on the environment. Hence, this study conducted experiments using steel slag waste from PT Hani Jaya Steel as a substitute for gravel. The experiment's result is expected to improve the quality of the mix and reduce the impact of environmental pollution that occurs due to the accumulation of waste slag. This research aims to determine the effect of gravel slag on the characteristics of asphalt concrete mixture. This research uses experimental method which has an experiment to get the result, thus it will be seen the utilization of steel slag gravel on asphalt concrete construction with slag variation of 0%, 10%, 20%, 30%, 40% and 50%. Checking of standard aggregate or aggregate slag and asphalt should follow procedures in accordance with SNI. The results of examination and analysis of the concrete asphalt mixture's characteristic using variation of steel slag grade showed an increase of mixed concrete asphalt performance. Mixing stability using steel slag gravel tends to increase with the optimum limit of 30%, and then decrease to 50%. The highest stability was achieved at 6% of bitumen content with the optimum slag rate of 30%. The value of mixing flexibility is expressed by Marshall Quotient (MQ) which indicates that its value tends to increase as the slag gravel increases in the asphalt concrete mixture, and make the mixture stiffer as the addition of slag gravel to the highest limit of 30% with asphalt content of 5% and afterward, will decrease. Durability has many scopes including the durability associated with the void in the mix (VIM) and the abrasion value of the coarse aggregate mixture. The value of VIM in this study has increased along with the increase of glycerol content in the mixture. The optimum durability value occurred at 30% slag gravel with 6% asphalt content.