In the concept of bitumen road surface design, APA recently provided a permanent road surface concept.

在沥青路面结构设计理念上，美国沥青路面联合会(APA)最近又提出了永久性路面的概念。

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The surface of bitumen pavement is always affected by climate factor and some kinds of load that lead to some road diseases such as crazing, relaxing, distortion and so on.

沥青道路面层受到各种气候因素、荷载作用的影响，经常发生开裂、松散、变形等病害。

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When the bitumen bonds break down, so does the road surface.

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It is made from a blend of crushed rock, rubber and polyurethane, a synthetic plastic that replaces bitumen as the binding agent and allows even bigger pores in the road surface.

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