Experimental evaluation of ceramic waste as filler in hot mix asphalt

Filler, as a component of hot mix asphalt, has an important role in improving the mechanical properties and extending the lifespan of asphalt. This research is conducted to evaluate the use of ceramic waste as filler and its effect on the mechanical properties of asphalt. For this purpose, ceramic waste powder was replaced with conventional limestone filler at 25%, 50%, 75%, and 100% proportions. Marshall stability, moisture sensitivity, four-point bending fatigue, and wheel track tests were used to investigate the effect of ceramic waste on asphalt performance. The results indicated that the Marshall stability was enhanced in all replacement ratios of the ceramic (23% increment for the maximum rate of substitution). Also, the resistance of the asphalt to moisture improved by approximately 5% after using 100% ceramic waste powder. In addition, the results showed that this rate of substitution as filler of HMA increased the fatigue life (approximately 600 cycles more than control specimens) and rutting resistance (reduction of almost 31% of the rut depth). Therefore, this waste material first improved the mechanical properties of HMA, and can also be used as a suitable approach for recycling this waste material. Graphic abstract