SMA薄罩面层的潜在应用

SMA自从1991年在美国应用以来，几乎所有的混合料公称最大粒径均为12．5mm和19.0mm，然而，细SMA（公称最大粒径为4．75mm和9、5mm的SMA）也存在很多的优点。通过对所设计的细SMA与常用SMA（大公称最大粒径）性能的对比，表明细SMA可以用来铺设更薄的面层，具有很好的嵌挤作用、抗车辙能力、在相同空隙率条件下，有更好的防渗性能和耐久性；细SMA对于薄罩面层来说作为预防性养护计划的一部分是一个可行的选择。

Potential Application of the Face of SMA

Since the application of SMA in USA from 1991,almost all commixture expects that nominal maximal grain diameter is 12.5 mms and 19.0 mms n,but,thin SMAl(SMA whose nominal maximal grain diameter is 4.75 mms and 9.5 mms) also has many advantages.Contrasting the function of designed thin main body of a book is passed to what be designed that thin SMA and that of norminal SMA,this passage indicates that thin SMA may be used to lay a thinner face,has very good effect of embedding and pushing and the ability to resist rut.Moreover,under the same condition,that thin SMA has better durability and the ablity of preventing permeance.As far as the thin face,the thin SMA is a feasible choice as one of parts of the precautionary maintaining plan.