Contrast And Research On Performance Of Kinds Of Asphalt Mixtures Used In Rehabilitation Project Of Freeway

The freeway have had rapid development in china in recent years, however, there are so many problems that have lead to serious premature failure of asphalt pavement, so the asphalt freeway will face rehabilitation in the future. It is a great concern for the road constructers to adopt economical and reasonable rehabilitation ways, based on destroy status of old asphalt pavements, at the same time, it is also key and difficulty for rehabilitation construction of freeway to choose the kinds of asphalt mixtures.Based on the objective evaluation of the old asphalt pavement, the project adopts all kinds of rehabilitation ways, then summarizes the best rehabilitation one, which can improve pavement performance of asphalt pavement and extend its use-life. All of these provide some references and experience for future rehabilitation of freeway.Firstly, based on the experiences and research results on the rehabilitation ways home and abroad, through the study of Zhenjiang lateral of Hu-Ning freeway such as pavement condition survey and estimate of carrying capacity, this paper analyses the types and reasons of premature failure of asphalt pavements and draws rehabilitation ways with different kinds of asphalt mixtures and different kinds of asphalt pavement structures.Secondly, manifold tests had been done to estimate pavement performance of six kinds of asphalt mixtures, compare the index of estimate, and analyze factors that affect pavement performance of asphalt mixtures. Then, test road was constructed on the basis of the lab tests. After the construction, according to the long-term observation of test road, this paper estimates the attenuation rule of asphalt pavement with different kinds of asphalt mixtures and pavement structures. Based on observation of temperature within the asphalt pavement, this paper analyzes temperature rule within the asphalt pavement.Finally, according to the analysis of initial stages'investments and the evaluation of performance resulted from lab tests of rehabilitation ways with various kinds of pavement types and structures, economic evaluation and technical analysis were carried out in this paper.