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日本沥青路面一般分为:表面处治、简易路面和高级路面等几种。所谓高级路面,按照《道路构造令》规定:面层厚度应在5厘米以上,面层下应有底层,耐用年限20年以上。至于高速公路,1963年日本建设省道路局下达高速公路结构标准,较之《道路构
Japanese asphalt pavement is generally divided into: surface treatment, simple pavement and several kinds of high-grade pavement. The so-called senior pavement, in accordance with the “Road Construction Order” provides that: the thickness of the surface should be 5 cm above the surface should be the bottom, durable life of 20 years. As for the expressway, in 1963 Japan’s Construction Provincial Highway Bureau issued the highway structural standards, compared with "road structure