舗装一般

[V-546] Investigation results on the quality of subbase course that has been in service for a long time on expressways

*Dai Takauchi¹, Hiroyuki Iitaka¹, Hiroki Takebayashi² (1. Nichireki, 2. Expressway Research Institute)

Keywords:long-term use, expressway, subbase course, Open-cut survey