graded stone upper base course
Dry River Valley of Minjiang’s Upper Course
Asphalt mixtures base course
Asphalt stabilized base course
Asphalt treated base course
Base course
路面基层
基层
底层
水泥粉煤灰稳定碎石
路基层
勒脚层
承重层
垫层
道路基层
路面下层
主航向
底基层
base course for pavement
base course of cement stabilized sand
Base Course of Pavement
Base course slope section