Study Of Hot Mix Asphalt Base On Internal Analysis

Hot-Mix Asphalt mixture (HMA) is good performance meterial for freeway pavement. In recent years, related technology has been improved, But the high temperature rutting and water damage are still two main problems. HMA is a heterogeneous, viscous and temperature-sensitive granular material, Furthermore, the performance of HMA depends on not only material but also construction and even the situation of pavement structure. The research on HMA should not only stay on macro level analysis but also the submicro level deeply, so the object of this paper focus on analysis of the internal structure. Propose Material-Structure-Construction integrative design method base on the internal analysis of HMA.In this paper, Base on image processing technology and internal mechanics experiment, establish the internal structure index system. Depend on this index system we can analyze the internal structure of HMA. Such as the shape of aggregate, the gradation of aggregate, distribution of aggregate and mastic, the orientation of aggregate, the holes of HMA and the shear parameters of cohesion and angle of internal friction.Further more, with the adjustment of the micro-distribution of aggregate the shear strength has different corresponding value, for good shear performance, in different HMA, the combination of C andφreflect different rule. The index of image processing can be used to explain the internal reason of performance.Research the segregation and compaction of HMA under different aggregate gradation. Analyze distribution of stress in pavement layers and the requirement of performance.Finally, propose Material-Structure-Construction integrative design theory and base on the internal structure and mechanics analysis, give the design and construction adjustment method.