基于流变学的废胶粉改性沥青多相老化行为研究

郭猛; 孙晨璐; 管明阳

doi:10.16503/j.cnki.2095-9931.2025.02.009

交通运输研究 ›› 2025, Vol. 11 ›› Issue (2) : 105-118. DOI: 10.16503/j.cnki.2095-9931.2025.02.009

技术前沿

基于流变学的废胶粉改性沥青多相老化行为研究

郭猛 ¹^,²^,^* ,
孙晨璐 ¹^,² ,
管明阳 ³

作者信息 +

Study on the Multiphase Aging Behavior of Waste Rubber Powder Modified Asphalt Based on Rheology

GUO Meng ¹^,² ,
SUN Chenlu ¹^,² ,
GUAN Mingyang ³

Author information +

文章历史 +

摘要

由于胶粉的吸附溶胀作用以及与基质沥青之间的物质交换作用，可将废胶粉改性沥青视为多相复合体系，各分相相互作用，共同影响其性能。为探究废胶粉改性沥青在长期热氧老化过程中的多相差异性老化行为，首先采用物理过滤与化学萃取结合的方法，对不同老化时间下的废胶粉改性沥青进行多相分离，然后对废胶粉改性沥青、70#基质沥青以及分离出的沥青相进行频率扫描试验，探究老化前后各沥青高温、疲劳以及低温性能的变化情况。结果表明，相同老化时间下，吸附沥青相复数模量最低，相位角最高，是废胶粉改性沥青中最软的部分。由于受到胶粉保护，该相老化程度也较低。而未被胶粉吸附且含重质组分较多的游离沥青相在长期老化30 h后G-R参数最先超过初始开裂值，劲度模量在老化30 h、-18 ℃时最先超过300 MPa，蠕变速率在老化30 h、-12 ℃时最先低于0.3，该相热氧老化后抗开裂能力和应力松弛能力下降最明显，老化最为严重。胶粉的作用使得各沥青相在老化过程中表现出不同的高温、疲劳以及低温特性，这些特性共同影响废胶粉改性沥青老化后的性能。在后续再生方面，应考虑废胶粉改性沥青的各相差异性老化行为，从而实现多相高效再生。

Abstract

Due to the adsorption swelling effect of rubber powder and the material exchange effect with matrix asphalt, the waste rubber powder modified asphalt (WRMA) can be regarded as a multiphase composite system. The interaction of each component phase jointly affect the performance of WRMA. To explore the multiphase aging behavior of WRMA during the long-term thermal oxygen aging process, a combination of physical filtration and chemical extraction method was used to perform multiphase separation of the WRMA under different aging times. Then, frequency sweep tests were conducted on the WRMA, 70# base asphalt, and the separated asphalt phases. The changes in the high-temperature, fatigue, and low-temperature properties of each asphalt component before and after aging were explored. The results showed that the adsorbed asphalt phase had the lowest complex modulus and the highest phase angle at the same aging time, making it the softest part of the waste rubber powder modified asphalt. Due to the protection of the rubber powder, the aging degree of this phase was also relatively low. However, the free asphalt phase that was not adsorbed by the rubber powder and contained more heavy components showed the earliest G-R parameter surpassing the initial cracking value after 30 hours of long-term aging. The stiffness modulus of the free asphalt phase exceeded 300 MPa after 30 hours of aging at -18 °C, and the creep rate dropped below 0.3 after 30 hours of aging at -12 °C. This phase exhibited the most significant decrease in cracking resistance and stress relaxation abilities, showing the most severe aging in the WRMA. The role of the rubber powder made each asphalt phase exhibit different high-temperature, fatigue and low-temperature characteristics during the aging process, jointly affecting the performance of the WRMA after aging. In terms of subsequent regeneration, the multiphase aging behavior of WRMA should be considered to achieve multiphase and efficient regeneration.

导出引用

郭猛, 孙晨璐, 管明阳. 基于流变学的废胶粉改性沥青多相老化行为研究[J]. 交通运输研究. 2025, 11(2): 105-118 https://doi.org/10.16503/j.cnki.2095-9931.2025.02.009

GUO Meng, SUN Chenlu, GUAN Mingyang. Study on the Multiphase Aging Behavior of Waste Rubber Powder Modified Asphalt Based on Rheology[J]. Transport Research. 2025, 11(2): 105-118 https://doi.org/10.16503/j.cnki.2095-9931.2025.02.009

中图分类号： U491.1

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基金

国家重点研发计划项目(2022YFE0137300)

国家自然科学基金项目(52478429)

国家自然科学基金项目(52078018)

国家自然科学基金项目(U24A20198)

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收稿日期	出版日期
2025-01-24	2025-04-25
发布日期
2025-06-02

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