Investigation of the fracture energy of hot mixtures asphalt incorporating metallic wastes via semi-circular bending test

Abstract

In the study, metallic wastes were evaluated in order to reduce environmental impacts and to contribute fracture energy of HMA mixtures. In this context, aluminum chips and iron powders were included in the mixtures at 0.50%, 1.00%, and 1.50% (by weight of mixtures), and the effect of HMA mixtures on fracture energy was investigated by Semi-Circular Bending (SCB) test. Experiments were performed on a total of 28 SCB test specimens from 7 different series including reference, Al-0.50, Al-1.00, Al-1.50, Fe-0.50, Fe-1.00, Fe-1.50. Basic physical properties, dissipated energy (DE), fracture energy (Gf), flexibility index (FI), and crack resistance index (CRI) values of HMA specimens were measured and compared. Based on test results, carrying load capacity and Gf values of the mixtures were increased in the use of waste iron powders. A decrease in Gf and peak load values were obtained while increasing the aluminum chips ratios. However, with the use of 0.5% waste aluminum chips were contributed Gf, peak load, CRI, and FI values compared by the reference sample. It is concluded that both aluminum chips and iron powders contributed to fracture energy of HMA mixtures.