1、必要性

1, necessity

发达国家对于非排水性的高等级路面，一般未提采用高粘度沥青的要求，因为他们多采用柔性基层，而且面层的厚度较大，面层发生流动性变形的可能性小。而我国的情况不同，沥青路面多按强基薄面的原则设计，采用的是半刚性基层，而且气候条件较为恶劣，重载超载车又多，流动性剪切变形非常容易发生。因此，在普通的高速公路沥青面层中，有必要采用高粘度沥青。

Developed countries for non drainage of high grade pavement, not to mention the general requirements of high viscosity asphalt, because they use more flexible base, and the thickness of the surface layer is large, small deformation of the possibility of liquidity. In China, the situation is different, the asphalt pavement according to the principle of multi base and thin surface design, using the semi-rigid base, and the weather condition is bad, overloading car, very prone to flow shear deformation. Therefore, it is necessary to use high viscosity asphalt in the ordinary asphalt pavement of expressway.

（2）经济性

(2) economy

国外高粘度沥青的价格成倍高于普通改性沥青，同时柔性基层上的面层不易发生流动性变形，因此发达国家的普通高速路上一般也未采用高粘度沥青；而我国的高粘度沥青各项技术性能达到并超过日本的要求（低温延度远优于日本产品），但价格仅仅略高于普通SBS改性沥青，不到日本高粘度沥青售价的一半。从工程造价角度讲，能接受SBS改性沥青也就可以接受高粘度沥青。

Foreign high viscosity asphalt modified asphalt is higher than the ordinary price doubled, while the surface layer of the flexible base on the liquidity is not easy to deformation, so the developed countries generally are not using the ordinary high-speed road of high viscosity asphalt and high viscosity asphalt performance; the technology of our country reached and exceeded Japan requirements (low temperature ductility far the product is superior to that of Japan), but the price is only slightly higher than ordinary SBS modified asphalt, less than half the price of the Japanese high viscosity asphalt. From the point of view of engineering cost, it is possible to accept SBS modified asphalt to accept high viscosity asphalt.

（3）施工性

(3) constructability

业内有人担心，应用高粘度沥青在混合料拌和时是否会太稠，碾压时混合料是否会太硬，实际的情况是：高粘度沥青的60℃动力粘度在1万Pa.s以上，甚至10多万Pa.s，但135℃运动粘度仍为2Pa.s左右，与普通SBS改性沥青的和易性、碾压性完全一样。

Some people worry that the industry, whether the application of high viscosity asphalt will be too thick in mixing, when rolling the mixture is too hard, the actual situation is: high viscosity asphalt viscosity at 60 DEG C above 10 thousand Pa.s, or about 100000 Pa.s, but 135 degrees of kinematic viscosity is 2Pa.s or so, and ordinary SBS asphalt workability and compaction of the same.

以上就是采用高粘度沥青的原因了，从目前国内沥青路面的设计原则、使用条件和病害的情况说明了，在高速公路上全面推广应用高粘度沥青结合料是非常的必要性和可行性。

The above is the reason with high viscosity asphalt, from the current situation of domestic asphalt pavement design principle, use conditions and diseases that, on the highway to promote the application of high viscosity asphalt binder is very necessity and feasibility.