Durability of Asphalt Mixture Containing Municipal Solid Waste Incineration Bottom Ash Aggregate

Abstract:

Asphalt mixtures containing different dosages, different particle sizes of municipal solid waste incineration bottom ash aggregate (BAA) were designed by Marshall test method. The effect of BAA on Marshall test parameters and pavement performance was analyzed. Durability performance of asphalt mixture containing BAA was also investigated by freezethaw cycles splitting test, aging test and fatigue test. The results show that as the dosage of BAA in AC20 and SMA13 increases, the designed asphalt content, Marshall stability and flow value increases, hightemperature stability decreases, meanwhile water stability and anticrack performance at low temperature changes differently. Using BAA instead of 10% (by mass) natural aggregate for AC20, 10%~15% for SMA13 can both improve splitting strength after 3 freezethaw cycles, tensile strength ration and its reduction after aging test. When the dosages of BAA in AC20 and SMA13 are respectively 20% and 5%~10%, the mixtures have better anticrack performance at low temperature after aging and longer fatigue life. Based on the test results, the recommended dosages of BAA in AC20 and SMA13 are both 10%.