增韧改性沥青混合料的级配设计与性能分析

Gradation Design and Performance Analysis of Toughened Modified Asphalt Mixture

摘要:

为了提高沥青底面层抗弯拉疲劳应力的能力，以增韧改性沥青为基材，通过优化级配设计方案，进一步强化增韧改性沥青混合料的综合性能。在针对增韧混合料的低温抗裂与抗疲劳性能改良的基础上，通过与普通级配AM-25制备得到的沥青混合料的对比发现，级配优化后的增韧改性沥青混合料的低温抗裂指标提升17.04%～202.78%、抗疲劳性能指标提高62%～121%。该研究成果为增强沥青路面的耐用性与行车安全性提供了全新技术路径，具有实际工程应用价值。

Abstract:

To enhance the ability of the asphalt base layer to resist flexural and tensile fatigue stress, taking the toughened modified asphalt as the base material and through the optimization of gradation design scheme, the comprehensive performance of the toughened modified asphalt mixture is further enhanced. On the basis of improving the low-temperature cracking resistance and fatigue resistance of the toughened mixture, and through the comparison with the asphalt mixture prepared by the conventional gradation AM-25, it is found that the low-temperature cracking resistance indicators of the gradation-optimized toughened modified asphalt mixture are increased by 17.04%~202.78%, and its fatigue resistance performance indexes are increased by 62%~121%. This research outcome provides a brand-new technical approach for improving the durability and driving safety of asphalt pavements, and holds significant practical engineering application value.