Proceedings of The 7th International Conference on Innovation in Science and Technology
Investigation of fatigue fracture in basalt fiber-reinforced asphalt beams
Hamid Shirmohammadi, Sonia Moshfeghi
In this study, the effect of basalt fiber on asphalt beams is investigated for crack resistance to improve the performance with laboratory activity. Sample beams were prepared of local compressed asphalt containing polymer additives, especially basalt fibers. Asphalt specimens in dimensions of 20 cm*5 cm*5 cm in two cases without and with a volume of basalt fibers between 0 to 6 % of weight of used asphalt (0, 1, 2, 4 and 6 %) at temperatures of 5, 15 and 25 Celsius and loading frequencies of 1, 5 and 10 Hz are subjected to fatigue test. Fatigue test results show that reduction in the thickness of the specimens will show the asphaltic pavement potential for cracks. For all three mixtures reinforced with the basalt fiber, the thickness of the beam is maximal after 4 %, which means the minimum drop in the thickness of the beam under the fatigue test and indicates the optimal weight percentage of the basalt fiber executed in the beam layer. By increasing the percentage of asphalt mixing with basalt fiber from 0 to 4 percent, the drop in the thickness of the beam under the fatigue test decreases. But from 4 to 6 percent, the thickness of the beam increases. Thus, for 4 % basalt fibers, the drop in the thickness of the asphalt beam is less than fatigue testing, that is, the rate of cracking of asphalt reinforced with 4 % of the basalt fibers is minimal.
Keywords: Asphalt beam, Reinforced, Basalt fibers, Fatigue fracture, Vertical displacement.