Applied Technology Research On Hard Asphalt Concrete

Nowadays, with the phenomenon of overloading and heavy load increasing, rutting becomes one of main disease in asphalt pavement. In order to improve high-temperature stability of asphalt pavement, we can use 50# hard asphalt with higher viscosity as binder. As a kind of new materials with good high temperature anti-rutting performance, the 50# hard asphalt have been widely used abroad, and along with deeper understanding on hard asphalt, it will have an extensive application prospect.According to our country's current Specifications, this paper makes a research on two kinds of hard asphalt (zhenhai 50# hard asphalt produced by sinopec and 50# hard asphalt west produced by Petrochemical). The research mainly include:conventional technical index of asphalt binder,proportion design of hard asphalt mixture and research on pavement performance. Besides, this paper also has a study of construction technology on experiment road in order to inspect the material properties in practical projects.Through research, it is found that two kinds of hard asphalt binder both meet with all the indexes and the requirements of current specifications. Hard asphalt mixture proportion design can use Marshall design method, and its design process and technical index proportion are the same with common asphalt. Formed mixture has good high-temperature stability, furthermore, its low temperature crack resistance performance also meets the requirements. This paper suggests that hard asphalt should be applied at middle Surface Layer in practical engineering. Studies showed that hard asphalt mixture need higher temperature than common asphalt mixture when mixing,paving,and compaction, so special attention is required during construction.