Integration Design Of Asphalt Pavement Structure And Material Under Heavy Loads Based On The Horizon Function

In our country, a total of approximately 90% of highway pavement and a large proportion of general way are made of asphalt. Lots of researchers devote themselves to the design of asphalt pavement, especially the design of materials, mainly including Marshall design method, GTM research design method and Superpave mixture design method of surface layer mixture design method. In recent years, the concept of the long-life, full-life, integration design of material, especially the characterization of asphalt pavement materials subjected to heavy loads, was successively put forward. However, up to now, there is barely any updating or breakthrough of its theory and methods. Besides, the concept was rarely ever applied in asphalt pavement under heavy loads, either. In this paper, based on the coastal highway reconstruction project, we investigated the integration design of the pavement structure, material and horizon function. Actual survey data, numerical analysis and material performance test were performed. The main conclusions are as follows:Firstly, the themain models and the scope of axle load were determined through the analysis of traffic volume and axle load spectrum; And then, to meet the needs of the axle load conversion of this projec, we got the coefficient of axle load conversion in heavy traffic pavement.Secondly, based on the theory of horizon function and early damage reason, the distribution rules of stress and modulus changing interval of each structural layer in pavement were determined by numerical analysis coupled with synthetical analysis of mechanical properties and material properties of pavement. Based on this conclusion, the property of surface course material was studied.Finally, based on the layer function, an integration design scheme of structure and material of high performance asphalt pavement under heavy loads was put forward in view of the practical engineering.