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Effects of fiber reinforcement on the fatigue and rutting performance of asphalt mixes

Fatigue, stiffness and rutting characteristics have a major influence on the pavement performance. For this reason different fibers are currently in use to investigate the impact of loose fiber reinforcement on the performance characteristics of asphalt mixtures. This paper presents tests of the fatigue, stiffness and deformation characteristics of different asphalt mixes. An asphalt base mix AC 22 T S (3 variations) and a stone mastic asphalt SMA 8 S (8 variations) were chosen to determine the effect of fiber reinforcement on fatigue and rutting performance. The test results show the influence of the chosen fibers (cellulose and Polyacrylonitrile PAN) on the material characteristics mentioned. On the one hand the difference between the mastercurves is insignificant concerning fiber use. On the other hand it is obvious that the fibers significantly influence the fatigue behavior. The impact of reinforcement is also illustrated using the German pavement design process. The use of fibers allows a road base layer reduction by up to 6 cm without compromising the safety level. The plastic deformation value can be reduced to 42% depending on fiber type and quantity. Further improvement can be achieved by inserting polymer modified bitumen, which reduces the plastic deformation value to approx. 64%.