unbound graded base

• 级配碎石基层

unbound graded base的用法和样例：

例句

1. After unbound aggregate being settled in the semi-rigid pavement, there are great changes in structural stress distribution and form of structural default.
   半刚性沥青道路在加设级配碎石夹层后结构的受力情况发生巨大的变化。