1、 河北 联合 大学轻工学院 QINGGONG COLLEGE, HEBEI UNITED UNIVERSITY 毕业设计说明书 设计（论文）题目： 外文翻译 学生姓名： 安晓凯 学 号 ： 200915250522 专业班级 ： 09 土木 9 班 学 部： 土木工程部 指导教师： 易善斌 讲师 2013 年 05 月 30 日 附 录 Asphalt Mixtures-Applications, Theory and Principles 1 . Applications Asphalt materials find wide usage in the construction indust
2、ry. The use of asphalt as a cementing agent in pavements is the most common of its applications, however, and the one that will be considered here. Asphalt products are used to produce flexible pavements for highways and airports. The term “flexible” is used to distinguish these pavements from those
3、 made with Portland cement, which are classified as rigid pavements, that is, having beam strength. This distinction is important because it provides they key to the design approach which must be used for successful flexible pavement structures. The flexible pavement classification may be further br
4、oken down into high and low types, the type usually depending on whether a solid or liquid asphalt product is used. The low types of pavement are made with the cutback, or emulsion, liquid products and are very widely used throughout this country. Descriptive terminology has been developed in variou
5、s sections of the country to the extent that one pavement type may have several names. However, the general process followed in construction is similar for most low-type pavements and can be described as one in which the aggregate and the asphalt product are usually applied to the roadbed separately
6、 and there mixed or allowed to mix, forming the pavement. The high type of asphalt pavements is made with asphalt cements of some selected penetration grade. 附 录 Fig. 1 A modern asphalt concrete highway. Shoulder striping is used as a safely feature. Fig. 2 Asphalt concrete at the San Francisco Inte
7、rnational Airport. They are used when high wheel loads and high volumes of traffic occur and are, therefore, often designed for a particular installation. 2 . Theory of asphalt concrete mix design High types of flexible pavement are constructed by combining an asphalt cement, often in the penetratio
8、n grade of 85 to 100, with aggregates that are usually divided into three groups, based on size. The three groups are coarse aggregates, fine aggregates, and mineral filler. These will be discussed in detail in later chapter. Each of the constituent parts mentioned has a particular function in the a
9、sphalt mixture, and mix proportioning or design is the process of ensuring that no function is neglected. Before these individual functions are examined, however, the criteria for pavement success and failure should be considered so that design objectives can be established. A successful flexible pavement must have several particular properties. First, it must be stable, that is to resistant to permanent displacement under load. Deformation of an asphalt pavement can occur in three ways, two unsatisfactory and one desirable.
