Ah-50 Hard Asphalt Pavement Material Properties

When all countries prevent the asphalt pavement form being damaged, they put the rutting resistance on the first palce all the time. Besides optimum aggregate grading, bituminous binder's rheological property play a key role in the pavement performance. Having better high-temperature stability, hard asphalt are variedly applied overseas increasingly, so as to have a bright foreground.According to our heavy traffic asphalt technical standard, and the efforts of Superpave research in American, this paper have a systems research on two kinds of home-made AH-50 hard asphalt (MMN50# and KLMY70#). Reseach conclude: rheological property of the hard bituminous binder match ratio design mechanical performance pavement performance structure mechanical calculation, reasonable technics of construction, and so on.Through the theoretic reseach and experimentation on AH-50 asphalt, Compared to KLMY70#, the correlation coefficient between penetration grade and high-temperature stability is less than 60℃ dynamical viscosity grade. Suggest that wo should take 60℃ dynamical viscosity grade as a compulsion index to estimate the asphalt in using criterion. The Superpave binder criterion is fit to estimate the hard asphalt. Hard asphalt mixture could be designed by Marshall design method .which desigh flow and criterion are the same as the general bituminous mixture. Hard asphalt mixture have well pavement performace, and have better mechanical performance fatigue resistance and water damage resistance.At present, home-made hard asphalt(50#) could be used to actual project, but wo must have pay more attention to improving the production technology of asphalt, in order to make generally or nationwide applicable.