【摘要】 为提升超薄磨耗层的抗裂性能与施工压实质量，本文基于触变改性机理，采用自主研发的触变改性剂，开展了高触变改性沥青超薄磨耗层的配合比设计与系统路用性能研究。通过确定最优油石比（6.5%）、纤维掺量（0.4%）及触变剂掺量（0.4%），形成了类似SMA的骨架型间断级配；并借助高温车辙、低温小梁与半圆弯曲等试验，对比分析了高触变沥青混合料与市售增韧剂、高黏剂改性混合料在高温稳定、低温抗裂及中温抗裂等方面的性能差异。试验结果表明：高触变改性沥青混合料的动稳定度达7778次/mm，较空白样提升28.4%；最大弯拉应变为3778με，较空白样提升16.8%；断裂能与柔性指数则分别提升34.0%与37.8%。综合性能显著优于常规增韧与高韧改性材料。工程应用表明：铺筑试验段各项指标均满足规范要求，渗水系数≤20ml/min、构造深度均值0.72mm、摆值均值70BPN、平整度均值1.56mm，验证了该材料在实际工程中的可行性与优良服役性能。更多还原

【Abstract】 To improve the crack resistance and compaction quality of ultra-thin wearing courses, this study, based on the thixotropic modification mechanism, used a self-developed thixotropic modifier to carry out mix design and systematic pavement performance evaluation of a high-thixotropic modified asphalt ultra-thin wearing course. By determining the optimal asphalt-aggregate ratio(6.5%), fiber content(0.4%), and thixotropic agent content(0.4%), a skeleton-type gap gradation similar to SMA was formed. High-temperature wheel tracking tests, low-temperature beam bending tests, and semi-circular bending tests were conducted to compare the performance differences between the high-thixotropic asphalt mixture and commercially available toughening agent-and high-viscosity agent-modified mixtures in terms of high-temperature stability, low-temperature crack resistance, and intermediate-temperature crack resistance. The test results show that the dynamic stability of the high-thixotropic modified asphalt mixture reaches 7778 cycles/mm, an increase of 28.4% compared with the control sample; the maximum tensile strain is 3778 με, an increase of 16.8%; and the fracture energy and flexibility index increase by 34.0% and37.8%, respectively. The overall performance is significantly better than that of conventional toughened and high-toughness modified materials. Field application demonstrates that all indicators of the trial section meet the specification requirements: water permeability coefficient ≤ 20 ml/min, mean texture depth 0.72 mm, mean British Pendulum Number 70 BPN, and mean pavement smoothness 1.56 mm,verifying the feasibility and excellent service performance of this material in practical engineering.更多还原