| Title |
An Evaluation of Crack Resistance for Slag Asphalt Concrete Mixture Using Steel Slag Aggregates |
| DOI |
https://doi.org/10.12652/Ksce.2023.43.1.0071 |
| Keywords |
제강슬래그; 산업부산물; 슬래그 아스팔트 포장; 균열저항성 Slag; Industrial by-product; Slag asphalt concrete pavement; Crack resistance |
| Abstract |
With the continuous industrial development, not only natural resource depletion, waste generation, but also various weatherconditions are becoming more frequent. Efforts are continuing to recycle industrial by-products to overcome the climate crisis and saveresources. Slag is a representative by-product generated in the steel industry, and it is characterized by improving rutting resistance andmoisture sensitivity by increasing strength and reducing deformation when used as a material for asphalt concrete. On the other hand,slag has expansion properties so it is used as a relatively low-value-added material such as embankment and refilling materials. In orderto expand the application of slag, an experiment was conducted to evaluate the crack resistance of slag asphalt concrete pavement. Asa result of the indirect tensile strength test, it was found that the asphalt mixture using slag aggregate showed a value 1.13 times higherthan that of the general HMA with the same particle size, and the toughness was 1.17 units, improving crack resistance. In addition,it was found that the failure number of the 4-point beam fatigue experiment and the slag asphalt mixture was 20,409, which was morethan doubled compared to the general HMA. Furthermore, Overlay Test showed a tensile load residual rate of 4 times or more,improving crack resistance to repeated fatigue. Accordingly, the use of slag aggregate will likely have various advantages in improvingthe performance of asphalt concrete pavement. |