温拌剂种类及掺量对不同沥青流变性能的影响

为了研究温拌剂种类及掺量对沥青流变性能的影响，通过动态剪切流变仪对分别掺加RH和Evotherm温拌剂的SBS改性沥青和基质沥青进行温度扫描试验，分析了它们的复数剪切模量、相位角和车辙因子。结果表明，Evotherm温拌剂在28~52℃能够提升两种沥青抗车辙性能，52℃后效果减弱；并且在28~40℃间可以提高两种沥青弹性恢复性能，40℃后会使SBS改性沥青弹性恢复性能减弱，对基质沥青无影响。增加Evotherm温拌剂掺量，在28~52℃会使温拌SBS改性沥青抗车辙性能提高，使温拌基质沥青抗车辙性能有所减弱，52℃后影响不明显。RH温拌剂在28~46℃对两种沥青抗车辙性能略有不利，但负面作用随温度升高逐渐减弱甚至消失；RH温拌剂能够显著增大两种沥青高温时弹性恢复性能。RH温拌剂掺量增大会使两种沥青抗车辙性能降低，但会使弹性恢复性能增强。

Effect of warm mix agents type and dosage on rheological property of different asphalt

In order to study the effect of warm mix agents type and dosage on rheological property of different asphalts, temperature sweep experiment was tested for SBS modified asphalt and matrix asphalt mixed with RH and Evotherm warm mix agent by using Dynamic Shear Rheometerfor (DSR), and the complex shear modulus, phase angle and rutting factor of two kinds of asphalt were analyzed. The results show that Evotherm can improve the rutting resistance of two kinds of asphalt when the temperature is between 28℃ and 52℃, and the influence of Evotherm is weakened at temperature higher than 52℃. Evotherm can also improve the elastic recovery performance of two kinds of asphalt when the temperature is between 28℃ and 40℃, but it reduces the elastic recovery performance of SBS modified asphalt and has no effect on matrix asphalt at temperature higher than 40℃. The raise of Evotherm dosage can improve the rutting resistance of SBS modified asphalt and slightly reduce the rutting resistance of matrix asphalt when the temperature is between 28℃ and 52℃, and the influence is not obvious at temperature higher than 52℃. RH warm mix agent has a slightly adverse effect on anti-rutting performance when temperature is between 28℃ and 46℃, but the negative effect gradually weakens or even disappears with the rising of temperature, and RH warm mix agent can significantly increase the elastic recovery performance at high temperature of two types of asphalt. The increase of RH warm mix agent dosage will reduce anti-rutting performance but enhance the elastic recovery performance of two kinds of asphalt.