基于流变试验的温拌沥青结合料热氧老化特性分析

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关键词：流变试验；温拌沥青；热氧老化；黏度；流变指标

中图分类号：U416 文献标志码：A 文章编号：1003-5168（2025）23-0092-06

DOI：10.19968/j.cnki.hnkj.1003-5168.2025.23.016

Thermal-Oxidative Aging Characteristics of Warm Mix Asphalt Binder Based on Rheological Tests

LIU Yan ZOU Huihuang （Central & Southern China Municipal Engineering Design and Research Institute Co.，Ltd.， Wuhan ， China）

Abstract： [Purposes] In view of the unclear performance evolution of warm mix asphalt during the thermal-oxidative aging process，this study systematically investigated the effects of diferent warm mix agents and asphalt types on the rheological properties of asphalt binder after thermal-oxidative aging， to provide theoretical support for the durability design of warm mix asphalt.[Methods] Using SK-7O# base asphalt and SBS modified asphalt as the base binders，three warm mix agents—Sasobit，Evotherm，and Aspha-min—were added respectively. RTFOT and PAV were used to simulate short-term and longterm aging.The efects of aging on viscosity and high-and low-temperature rheological properties were evaluated through rotational viscosity，DSR，and BBR tests.The correlation between viscosity and rheological indicators was analyzed.[Findings] Warm mix agents overall improved the aging resistance of the asphalt binder，with Sasobit showing the best performance.Aging significantly increased the hightemperature rutting factor G*/sinδ but weakened the low-temperature crack resistance.The warm mix agents did not alter the low-temperature performance grade.Under long-term aging， G*/sinδ showed a good linear correlation with viscosity （ R2=0.773 7 ）.[Conclusions] Warm mix agents can significantly enhance the aging resistance of asphalt.Aging improves high-temperature performance but reduces lowtemperature crack resistance.The correlation between the rutting factor and viscosity provides a theoretical basis for predicting high-temperature performance.

Keywords： rheological test; warm mix asphalt; thermal-oxidative aging; viscosity; rheological index

0 引言

温拌沥青早在二十一世纪初被引入我国，其相较于热拌沥青，施工温度可降低 10～25°C ，具有良好的节能和环保等优势，在国家实施交通强国建设和"双碳”目标背景下，温拌沥青的研究和应用仍是道路工程行业的热点[1-3]

温拌沥青是将温拌剂投入熔融沥青结合料并在高速剪切等机械力作用下形成的沥青结合料。（剩余5746字）