The Research On Water Stability Evaluation Methods Of Asphalt Pavement

Because of excellent ride comfort, high mechanical strength, vibration resistant, more flat smooth, higher environmental benefits and so on, asphalt pavement in highway occupies a large proportion. However, shortly after the opening of the highway, it will place a variety of damage, such as pits , loose, jack pulp, rutting, cracks etc. impacting the use of road safety seriously, and reducing its long-term performance. This phenomenon is not because of the hysteretic design methods, design theory and experience, but also due to the development of the traffic to the heavy duty and multi-axis. According to research at home and abroad, there has 80% relevance with water stability during the various early damage. Other damages will be caused by water or indirect destroy caused by water. So it's very important to research the production of water damage, development mechanism and failure modes, and comprehensive evaluate occurring experimental methods commonly used, finding the good control targets with long-term performance in order to control the water damage and prolong the service life of asphalt pavement.Laboratory experiments are the basic means to evaluate the water stability and indirectly reflects the long-term performance of asphalt pavement. However, because of the limits of experimental conditions, dimension of the specimen and control elements ets. It can not well reflect the actual road conditions. Facing large numbers of experimental methods, every countries began to focus on its rationality and to research the improved methods, in order to better reflect its actual use in the process of pavement performance.In this paper, it will take three sides to study the evaluation of water stability of asphalt pavement based on the long-term performance of asphalt pavement. Firstly, by analyzing the characteristics of Water Damage to find external causes causing water damage , and providing the basis of Laboratory experiments. According to the development of water damage , several common types of damage will be understood, and its internal reasons will be found. Secondly, to find the recommended water stability test by comparing the test theory, test conditions, test results achieved and the degree of agreement with the actual comparison. Finally, to verify the reliability of the selected test methods by laboratory experiments. and appropriate for the improvement of its shortcomings. In addition, the improved freeze-thaw splitting Test will be analysised. To find its disadvantages and make appropriate recommendations for future research.