2024 Volume 80 Issue 21 Article ID: 24-21024
We have devised two new pavement rehabilitation methods to extend the lifespan of asphalt pavement on expressways. The two methods are to use highly durable asphalt for the binder course and the asphalt stabilized base course, and to reinforce the lower base course directly beneath the wheelpass at equal intervals. We named each of these methods “Method of reinforcing the binder course and asphalt stabilized base course” and “Method of base course rein-forced with cement piles”. Then, for the two methods, the strain was calculated using 3DFEM, and the fatigue life of the pavement was calculated from the strain. Fatigue life was determined for the method of reinforcing the binder course and asphalt stabilized base course by varying the rate of inter-fase of layers bonding between the binder course and the asphalt stabilized base course and between the asphalt stabilized base course and the subbase course. The number of fatigue failures was 5.7 times higher than that of the inservice asphalt mixture repaired with the same material, indicating that the adhesion between the base layer and asphalt stabilized base course has a significant influence on the fatigue life of asphalt pavements. The number of fatigue failures of the method of base course rein-forced with cement piles was 1.2 times higher than that of the inservice asphalt mixture repaired with the same material.
