为探究纳米粘土与聚苯乙烯-丁二烯-苯乙烯嵌段共聚物(SBS)复合改性沥青的流变特性和抗老化性能,采用物理试验、动态剪切流变(DSR)、多应力蠕变回复试验(MSCR)和弯曲梁流变试验(BBR),对旋转薄膜烘箱加热老化试验(RTFOT)前后的不同纳米粘土掺量的纳米粘土/SBS复合改性沥青进行对比,探讨短期老化前后不同纳米粘土掺量下纳米粘土/SBS复合改性沥青的抗老化性能。结果表明:添加纳米粘土能明显地提高SBS改性沥青的高温、低温性能和抗老化性能;随着纳米粘土掺量的增加,纳米粘土/SBS复合改性沥青短期老化后的抗车辙因子、不可恢复蠕变柔量等性能指标不同程度改善;十六烷基三甲基溴化铵活化的纳米粘土表现出较好的化学活化效果和抗老化性能。
In order to explore the rheological and anti-aging properties of nano-clay and SBS compositely modified asphalt,physical tests,dynamic shear rheology (DSR),multi-stress creep recovery test (MSCR) and bending beam rheology (BBR) tests were used.The modified asphalt with different nano-clay dosage before and after the rotating film oven heating aging test (RTFOT) was compared to investigate the ageing resistance under different nano-clay dosage before and after short-term aging.The results shown that the addition of nano-clay can significantly improve the high temperature,low temperature performance and anti-aging performance of the modified asphalt.With the increase of the amount of nano-clay,the performance indexes of anti-rutting factor and irreversible creep compliance of the modified asphalt improved to some extent after short-term aging.C16H33(CH3)3NBr activated nano-clay can exhibit better chemical activation and anti-aging properties.
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