The Isolation Analyses And It's Solve Countermeasures Of Asphalt Pavement In Construction Process

Bituminous pavement has become the primary type of pavement structure for highway in our country. The segregation of asphalt mixture during the construction is one of the main reasons for the damage in the early stage of the asphalt pavement. In recent years, many research organizations at home and aboard have explored extensively research on the segregation of the asphalt mixture which has biggish nominal size during the course of the construction. But these researches mostly concentrate on certain aspects of the segregation. And their conclusions are short of systematize. So the urgent affairs of the development work at present are as follows: to analyze the technical character of the segregation of the asphalt pave- ment roundly and systematically, to open out the cause of the segregation in the asphalt pavement, to reduce the degree of the segregation of asphalt mixture in the process of the construction, and to effectively assure that the asphalt pavement is holistically homogeneous. With investigation in the course of the construction of many field projects in the stages such as the design, the product process and the spreading of the asphalt mixture, this paper analyzes the reasons that there are the aggregate segregation and the temperature segregation in the asphalt mixture. The whole process of design and construction of pavement was researched, including choice of the type of asphalt mixture, aggregation design of asphalt mixture, selection, production and management of primary materials , production, transportation and compaction of asphalt mixture , the running arameters of spreaders , spreading and compacting technology of machines . it studies how to reduce the degree of the happening of the two kinds of segregation of the asphalt pavement effectively in the whole process of the construction, and puts forward several technical controlling asures. Applying the principles of the system of the quality control and the quality acceptance, and on the base of the modern method of the checking and accepting the product quality, it advance the theory and the model of putting up the adjustment of the payment answering to the mass defect of the pavement. Contraposing the condition that there are different degrees of segregation in existence of the asphalt pavement, it put forward the method of calculating the ratio of the segregation and the conception of the accepting ratio of the segregation, and finds the relation between the conception of the accepting ratio of the segregation of the pavement and the adjustment of the payment.In our research effort, we do our best to perfect and improve the system of the technical specification for construction quality of the asphalt pavement in our country, to reduce the breakage in the early stage of the asphalt pavement, and to reduce the level of the maintenance costs in the late stage.