路面在使用过程中,其使用性能会随行车荷载和自然因素的作用而逐渐衰变。当损坏达到某一预定标准或最小可接受水平时,就需要采取改建措施如进行罩面或加铺以恢复和提高路面的使用性能。而不同的改建时机和改建措施对改建以后的性能会产生不同的影响,从而产生不同的经济效果,这就存在最佳改建时机和最佳改建厚度的选择问题。 Pavement in use, its performance will be with the car load and the role of natural decay gradually. When the damage reaches a predetermined standard or minimum acceptable level, it is necessary to take retrofitting measures such as covering or paving to restore and improve the serviceability of the pavement. Different reconstruction time and reconstruction measures will have different impacts on the performance after the reconstruction, resulting in different economic effects. Therefore, there is the best choice of reconstruction time and the optimal reconstruction thickness.