Abstract:

The key technology for the design of the mix proportion design of asphalt mixture, analysis of the performance of recycling old material，and determine proportion design of asphalt mixture，analysis of the content of asphalt and mineral aggregate gradation in the recycling of old materials.  The American asphalt association method was used to estimate asphalt in the recycled asphalt mixture，which was used as the calculation parameters of the old the amount of
material when blending ratio.  Determine the content of the old material，using Marshall method to carry out the mix propor-
tion design,  ultimately determine the optimum gradation and asphalt content.  The American asphalt association was used to estimate the amount of asphalt mixture used in the calculation of the formula for the calculation of asphalt mixture，the formula was amended by the coefficient：P = 0. 025 a + 0. 03 h+kc+f。

Key words: road engineering, pavement material, regeneration, mix proportion design