Comparative evaluation of commercial and recycled rejuvenators for hot mix asphalt recycling

IF 2.3 4区材料科学 Q2 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Mechanics of Time-Dependent Materials Pub Date : 2025-09-26 DOI:10.1007/s11043-025-09827-3

A. Nirmal Prasad, Nikhil Saboo, Agnivesh Pani

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Abstract

Rejuvenators used for hot mix recycling can be classified broadly into recycled rejuvenators (RR) and commercial rejuvenators (CR). A comparative evaluation between two RR and two CR is done in this study. A series of tests on rejuvenators (Brookfield viscometer, rolling thin film oven and Fourier Transformed Infrared Radiation tests), recycled binder blends (zero shear viscosity, frequency sweep, multiple stress creep recovery) and recycled mixes (uniaxial cyclic compression test and Indirect tensile asphalt cracking test) are performed. FTIR spectra revealed that all rejuvenators comprise aliphatic and aromatic hydrocarbons, which are similar to the maltenes portion of asphalt. Test results showed that RR are thermally stable than CR and recycled binder blends with RR are softer than CR. Hence, RR have higher cracking resistance and cross-over frequency, but lower Zero Shear Viscosity and rutting resistance. Also, recycled mixes with RR showed higher irrecoverable strains than mixes with CR. On top of performing well in rutting, recycled mixes with CR also showed better or comparable fatigue performance at 40% recycled content. From the ranking analysis, it is concluded that RR outperformed CR, and weight change after RTFO test has the best correlation with the global total rank value (GTRV).

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热混合沥青再生用商用和再生再生剂的比较评价

用于热混合回收的回春剂大致可分为再生回春剂（RR）和商业回春剂（CR）。本研究对两种RR和两种CR进行了比较评价。对再生剂（Brookfield粘度计、滚动薄膜烘箱和傅立叶变换红外辐射试验）、再生粘结剂共混物（零剪切粘度、频率扫描、多重应力蠕变恢复）和再生混合料（单轴循环压缩试验和间接拉伸沥青开裂试验）进行了一系列试验。FTIR光谱显示，所有恢复剂都含有脂肪烃和芳香烃，类似于沥青的maltenes部分。试验结果表明，RR比CR热稳定，与RR共混的再生胶比CR软，因此RR具有更高的抗裂性和跨越频率，但具有更低的零剪切粘度和车辙阻力。此外，含RR的再生混合料比含CR的再生混合料表现出更高的不可恢复应变。除了车辙性能良好外，含CR的再生混合料在40%的再生含量下也表现出更好或相当的疲劳性能。从排名分析可知，RR优于CR， RTFO检验后的权重变化与全局总排名值（GTRV）的相关性最好。

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来源期刊

Mechanics of Time-Dependent Materials 工程技术-材料科学：表征与测试

CiteScore

4.90

自引率

8.00%

发文量

审稿时长

>12 weeks

期刊介绍： Mechanics of Time-Dependent Materials accepts contributions dealing with the time-dependent mechanical properties of solid polymers, metals, ceramics, concrete, wood, or their composites. It is recognized that certain materials can be in the melt state as function of temperature and/or pressure. Contributions concerned with fundamental issues relating to processing and melt-to-solid transition behaviour are welcome, as are contributions addressing time-dependent failure and fracture phenomena. Manuscripts addressing environmental issues will be considered if they relate to time-dependent mechanical properties. The journal promotes the transfer of knowledge between various disciplines that deal with the properties of time-dependent solid materials but approach these from different angles. Among these disciplines are: Mechanical Engineering, Aerospace Engineering, Chemical Engineering, Rheology, Materials Science, Polymer Physics, Design, and others.