Abstract
This study was conducted to explore the possibility of recycling of waste stone dust sludges as a asphalt concrete filler. The stone dust sludges used in this study consist of 55.68% of SIO2, 19.63% of AL2O3, 2.38% of FeO, and the other minor minerals. Through experiments such as plasticity index, flow test, rate of expansion under water striping resistance, it was found that the stone dust sludges were satisfied with the quality specification of filler. Marshall stability tests on the asphalt concrete containing stone dust sludges showed that the highest Marshall stability values were obtained in case of mixing 4% of stone dust sludges with 3.6% of asphalt for base and in case of mixing 4% of stone dust sludges with 5.2% of asphalt for surface, respectively. These results indicate that the content of asphalt can be reduced by 0.4% for base and 0.2% for surface compared with the standard mixing design. Based on the leaching tests, in addition, only a small amount of lead below the standard level was leached, and no other harmful substances were leached. From this study, the stone dust sludges can be used as a filler for asphalt concrete mixtures, and it makes reducing the production costs of asphalt concrete and also decreases the disposal costs of waste stone dust sludge.