SBS (styrene–butadiene–styrene block copolymer) is currently the most widely used asphalt modifier, and SBS modified asphalt is usually prepared by high-speed shearing. This paper combines the cavitation effect of ultrasonic to assist in the preparation of SBS modified asphalt, and conducts numerical simulation and rheological properties research on the cavitation bubbles in the molten SBS modified asphalt fluid. The cavitation bubbles in the modified asphalt fluid will expand and contract as the pressure changes inside and outside the bubbles. When the cavitation bubble is compressed to the minimum and the pressure inside the bubble reaches 1.94 × 10Pa, the direction of the velocity vector near the cavitation bubble will change with the expansion and compression of the bubble. The expansion–contraction process of a single cavitation bubble can release 6.41 × 10J of energy, thus breaking the long bonds in asphalt and generating a large number of free radicals react with the unsaturated C = C bonds in the SBS molecules. According to the preparation process of modified asphalt, the influence of ultrasonic wave on rheological property of modified asphalt was studied through experiments. The results show that ultrasonic treatment can enhance the elasticity of asphalt and improve the temperature sensitivity of asphalt. With the increase of ultrasonic treatment time, the anti-rutting deformation ability of SBS modified asphalt is greatly improved. At the same temperature, the recovery rate of asphalt also increases with the increase of ultrasonic treatment time, and the non-recoverable compliance (J) decreases Combined with the numerical simulation of cavitation bubbles, the ultrasonic process is added to asphalt production, which is of great significance for the green production of modified asphalt and the improvement of the rheological properties of modified asphalt.

中文翻译：

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超声波辅助制备SBS改性沥青：空化气泡数值模拟及流变性能


SBS（苯乙烯-丁二烯-苯乙烯嵌段共聚物）是目前应用最广泛的沥青改性剂，SBS改性沥青通常通过高速剪切制备。本文结合超声波空化效应辅助制备SBS改性沥青，对熔融SBS改性沥青液中的空化气泡进行数值模拟和流变特性研究。改性沥青液中的空化气泡会随着气泡内外压力的变化而膨胀和收缩。当空化气泡被压缩到最小，气泡内部压力达到1.94×10Pa时，空化气泡附近的速度矢量方向将随着气泡的膨胀和压缩而改变。单个空化泡的膨胀收缩过程可释放6.41×10J的能量，从而破坏沥青中的长键，并产生大量自由基与SBS分子中的不饱和C=C键反应。根据改性沥青的制备工艺，通过实验研究了超声波对改性沥青流变性能的影响。结果表明，超声波处理可以增强沥青的弹性，改善沥青的温度敏感性。随着超声波处理时间的增加，SBS改性沥青的抗车辙变形能力大大提高。 相同温度下，沥青的恢复率也随着超声波处理时间的增加而增加，不可恢复的柔度（J）降低。结合空化气泡的数值模拟，在沥青生产中加入超声波工艺，即对于改性沥青的绿色生产和改性沥青流变性能的提高具有重要意义。