基于低熔点改性剂的干法高黏沥青混合料路用性能

Road performance of dry-process high-viscosity asphalt mixture based on low-melting-point modifier

摘要

为解决高黏沥青混合料湿法工艺存在的小规模应用难、易离析，以及干法工艺成本高等缺陷，制备低熔点高黏改性剂，并评估其在干法工艺中的应用可行性，利用较低掺量的改性剂制备高黏沥青及混合料，评价改性剂掺量对沥青宏微观性能和混合料高温、低温、水稳定性及水热耦合性能的影响。结果表明：该改性剂适用于干法直投工艺，可在180℃下快速熔融并实现高黏改性；随改性剂掺量的增加，沥青与混合料性能提升，但掺量过高不利于压实；建议的改性剂掺量为基质沥青质量的8%~10%，约为传统干法改性剂的2/3。

Abstract

To address the limitations of conventional processes for producing high-viscosity asphalt mixtures, including the difficulty of applying the wet process at small scales, its susceptibility to segregation, and the high cost of the dry process, this study developed a low-melting-point high-viscosity modifier and evaluated its feasibility for dry-process application. High-viscosity asphalt and asphalt mixtures were prepared with a relatively low modifier dosage. The effects of modifier content on the macro- and micro-properties of asphalt, as well as on the high-temperature, low-temperature, water stability, and hydrothermal coupling performance of the mixtures, were then investigated. The results show that the modifier is suitable for direct dry-process incorporation, as it can melt rapidly at 180℃ and achieve effective high-viscosity modification. With increasing modifier content, the performance of both asphalt and asphalt mixtures improves; however, excessive dosage is unfavorable for compaction. The recommended modifier content is 8%-10% of the mass of base asphalt, which is approximately two-thirds of that required for conventional dry-process modifiers.

关键词

低熔点高黏改性剂 / 干法高黏沥青混合料 / 性能指标 / 微观形貌

Key words

low-melting-point high-viscosity modifier / dry-process high-viscosity asphalt mixture / technical performance index / microstructure

参考文献

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基金资助

山东省自然科学基金项目(ZR2024LZN020)