The number of drainage asphalt pavement sections has been increasing over the few decades on Japanese expressways. On the drainage asphalt pavement sections, it is empirically known that local damages, especially pot holes, arise in addition to cracks more frequently than the conventional dense graded asphalt pavement sections. This paper proposes a deterioration evaluation method considering the local damages explicitly to be applied to management issue for the drainage asphalt pavement sections. In the method, a pavement section is divided into small sections (1m*0.875m) to evaluate generation processes of the local damages, and the deterioration processes are expressed with an aggregative Markov deterioration hazard model. Using the proposed method, it becomes able to describe transitions of deterioration states over time on the drainage asphalt pavement sections from cracks to local damages. Lastly, the effectiveness of proposed methods can be discussed in the application example for actual expressways.

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 The authors carried out WT tests under the tire pressure of 1.1 MPa using grooved test specimens that were prepared with different compaction method and degree. The specimens whose compaction degree are arranged to 100% with steel compactor and rubber tire showed at most 1.4 times higher residual volume of groove when they are compared with the specimens whose compaction degree is 98%. Moreover, cores sampled from non-grooved test specimens were scanned by means of X-ray CT scanner to evaluate compaction degree of near surface of asphalt mixture. As a result, range from 2mm to 5mm in depth of the mixture which was compacted by steel compactor was higher compaction degree than that of the mixture which was compacted by steel compactor and rubber tire. In addition, there was a positive correlation between grooving stability and the compaction degree of range from 2mm to 5mm in depth.

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