石灰煤碴路面(简称二碴路面),是利用钢铁厂等大型工厂的废料、石灰下脚及煤碴,按一定的配合比拌和均匀、压实做成的路面底层。为了加强抗磨能力,并常保平整,可在这个底层上面,加铺沥青(或多腊重油)表面处治。由于石灰下脚及煤碴是工厂废料,利用废料,材料本身可以少花钱甚至不花钱,造价很低,另一方面也解决了城市废料处理问题,一举两得。尤其对不产砂石材料的大城市,修建郊区公路路面,有重大意义,是发展的方向。上海郊区公路1963年已经开始应用,经过一年来的行车考验,效果良好,目前已有很多单位开始推广。 Lime ballast pavement (referred to as two ballast pavement), is the use of large factories such as steel mills waste, lime foot and coal ballast, according to a certain mix of uniform mixing, compaction made of the pavement. In order to strengthen the anti-wear ability, and often security level, can be in the bottom above, plus asphalt (or Dala heavy oil) surface treatment. As the lime foot and coal ballast is the factory waste, the use of waste, the material itself can be less or no money, low cost, on the other hand also solved the problem of urban waste disposal, serve two purposes. Especially for large cities that do not produce sand and gravel materials, it is of great significance to construct suburb highway pavement, which is the direction of development. Shanghai Suburban Highway 1963 has begun to apply, after a year of driving test, the effect is good, there are already many units began to promote.