Also introduced here are the mixture ratio and design of pavement, base, sub-base, sub-seal and old road strengthening for typical pavement structure of different road classes in Zhengzhou.
同时，还对近阶段郑州市不同道路等级典型路面结构的面层、基层、底基层、下封层和旧路补强的配比和设计作了详细的介绍。
Base; road base [highways] : the part of the road structure Below the base course and above the sub-base.
基层[公路]：路面层之下路基之上的道路结构部分。
Non-cohere granular stone is widely used as a kind of material of road pavements, and it's also widely used in base or sub-base of flexible road surface in overseas by now.
无粘结粒料是一种应用广泛的路面材料，至今仍然广泛用于国外柔性路面的基层和底基层。
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