采用密级配的方法配制出的混凝土，可以达到节约水泥、降低成本的目的。
Concrete manufactured with this method may achieve the purpose of saving cement and lowering costs.
结果表明，采用粗细集料搭配均匀的连续密级配和适中的沥青用量可以获得最佳的抗永久变形能力。
The results show that best permanent deformation resistance can be got when continuous dense gradation, which has even arrangement of coarse and fine aggregate is adopted.
详细介绍了汾柳高速公路密级配改性沥青混合料的使用情况，重点介绍了改性沥青的技术指标和密级配沥青混合料级配范围的确定，另外还对施工工艺进行了阐述。
The paper introduced the application of dense modified bitumen mixture to Fenliu Expressway, mainly discussed technical index of modified bitumen and the gradation scope of dense bitumen mixture etc.
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