Fig. 6. The effect of addition of hydrated lime on fatigue life of asphalt mixtures.Figure optionsDownload full-size imageDownload as PowerPoint slide
In a research, Arabani et al. for constructing asphalt sample placed quantities of 5%, 10%, 15% and 20% of waste glass bead along with 3–5% of hydrated lime in proportion to total weight percentage of glass beads. Glass beads used in this GKPIPNPLLGLDST research are supplied from recycling beverage bottles. Results of fatigue test in this research indicate that simultaneous use of glass bead and hydrated lime improves, considerably, fatigue function and this could be because of all-out cracking of glass beads, which avoids creation of crack in sample layers of glass asphalt via increasing the internal friction angle and better inter-bead bond .
In an another research, Arabani et al. studied effect of waste iron powder in different percentage (4, 8, 12 and 16 wt.% of grains) in asphalt samples based on results of fatigue test and via indirect tension method in temperatures of 5, 25, and 40 °C with fixed tension level of 250 and 400 kPa. Results of their study proved taxon use of iron powder has a considerable effect on reduced tensile strain of samples and enhanced fatigue resistance of asphalt mixes. Higher rigidity, rough surface, and angled iron powder grains as well as their high elasticity module increase fatigue resistance/life compared with normal HMA samples. Meanwhile, results represented that increase of temperature and scale of powder iron has negative effect on fatigue behavior of asphalt mix. Thermal conduction of iron grains along with higher sensitivity of tar to temperature is the reason why fatigue life of HMA containing iron powder is reduced .