关键词: 沥青混凝土, 消石灰, 废胶粉, 改性

Abstract: To improve the service performance of asphalt concrete panels, it is proposed to modify as_ phalt concrete with hydrated lime and waste rubber powder. Porosity, low-temperature crack resistance and slope flow tests of modified asphalt concrete with different contents of waste rubber powder and hy_ drated lime are conducted. The results indicate that the two modified materials have significant effects on improving the low-temperature crack resistance and thermal stability of asphalt concrete, and there is certain positive synergistic effect. Taking into account the experimental results and engineering eco _ nomics, it is recommended to simultaneously add 3% hydrated lime and 10% waste rubber powder. Com_ pared with the scheme of adding a single modifier, this scheme has good effect on improving the low- temperature and high-temperature performance of asphalt concrete, which is recommended for use in construction of asphalt concrete face rockfill dams.

Key words: asphalt concrete, hydrated lime, waste rubber powder, modification