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将不同细度的废橡胶粉加到170～180℃的沥青中,充分搅拌1～2h,制成沥青橡胶。通过车辙试验、低温弯曲试验、冻融劈裂试验以及疲劳试验研究不同细度橡胶粉对沥青混合料性质的影响。结果表明:重交沥青经废橡胶粉改性后,软化点升高,135℃黏度增大;低温延度增加;针入度指数PI增加,同时抗老化性也得到了提高。对于不同细度的橡胶粉改性沥青后,表现为粗的橡胶粉改性沥青的软化点要高于细的橡胶粉,而细橡胶粉改性沥青的低温延度要大于粗的橡胶粉。沥青被橡胶粉改性后其混合料的低温、高温稳定性,水敏感性以及耐疲劳性都得到了显著改善,但不同细度的橡胶粉有差别,粗橡胶粉改性沥青混合料的高稳抗车辙能力要优于细橡胶粉,细橡胶粉改性沥青混合料的低温抗裂性要优于粗橡胶粉。
The waste rubber powder of different fineness is added into the asphalt of 170-180 DEG C, and fully stirred for 1 to 2 hours to prepare asphalt rubber. The influence of different fineness of rubber powder on the properties of asphalt mixture was studied by rutting test, low temperature bending test, freeze-thaw splitting test and fatigue test. The results showed that after the modified asphalt was modified by waste rubber powder, the softening point increased, the viscosity increased at 135 ℃, the ductility at low temperature increased, the penetration index (PI) increased, and the aging resistance was also improved. For different fineness of modified asphalt rubber powder, the performance of coarse rubber modified asphalt softening point is higher than fine rubber powder, and fine rubber modified asphalt low temperature ductility greater than coarse rubber powder. Asphalt rubber modified by rubber powder mixture of low temperature, high temperature stability, water sensitivity and fatigue resistance have been significantly improved, but the difference between the different fineness of rubber powder, coarse rubber modified asphalt mixture high Rut stability is better than fine rubber powder, fine rubber powder modified asphalt low temperature cracking resistance is better than crude rubber powder.