The former use provides for equalization of stress as well as segregation of subsoil and fill; the later reduces cracking of the road base and asphalt surface and reduces the amount of asphalt required for good stability of the road surface.

 
  • 前者可使應力均衡,也可隔離下層土與填充土;后者可減少路基及瀝青面的斷裂,降低為保證路面穩定所需的瀝青用量
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