Self-healing asphalt with optimised tyre-based pyro-rejuvenator

IF 6.7 1区工程技术 Q2 ENERGY & FUELS

Fuel Pub Date : 2025-05-28 DOI:10.1016/j.fuel.2025.135747

Manuel Chávez-Delgado , Jose L. Concha , Silvia Caro , Carlos P. Silva , Luis E. Arteaga-Pérez , Jose Norambuena-Contreras

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Abstract

This study investigates an optimised pyro-rejuvenator (PR), derived from the pyrolysis of waste tyres, as a novel agent for self-healing asphalt. A multi-scale approach, encompassing chemical, microstructural, and mechanical evaluations, was employed to assess the effectiveness of the pyro-rejuvenator. The PR was incorporated into long-term aged bitumen (PAV) at dosages of 3 wt. % and 6 wt. %, with chemical changes analysed using Fourier transform infrared spectroscopy (FTIR), atomic force microscopy (AFM), and chemical fractionation (SARA). The self-healing performance of the treated and unaged bitumen was evaluated through fatigue-healing-fatigue tests using a dynamic shear rheometer (DSR) and tensile tests under static conditions. Additionally, the PR’s efficacy was compared with a commercial rejuvenator. Results showed that PR’s high content of alkenes and aromatics (e.g., limonene: 32.9 %, cymene: 20.65 %) facilitated the restoration of the maltenic fraction in bitumen and enhanced chemical interactions with the treated material. These compounds also promoted the pepticising effect on the “bee-like” structures, leading to a more homogeneous microstructure. Under optimal conditions (6 wt. % PR dosage and 30 °C), a fatigue healing index of 30 % was achieved, comparable to virgin bitumen (31 %). In tensile tests at 25 °C after 12 h, the healing index matched that of the commercial rejuvenator. These findings highlight the potential of pyro-rejuvenators as a sustainable and effective solution for the functional restoration of aged bitumen.

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自愈沥青与优化轮胎为基础的热回春剂

本研究研究了一种优化的热再生剂（PR），来源于废轮胎的热解，作为一种自愈沥青的新型剂。采用多尺度方法，包括化学、微观结构和力学评估，来评估热再生剂的有效性。将PR以3 wt. %和6 wt. %的剂量掺入长期老化的沥青（PAV）中，使用傅里叶变换红外光谱（FTIR）、原子力显微镜（AFM）和化学分馏（SARA）分析其化学变化。通过动态剪切流变仪（DSR）的疲劳-愈合-疲劳试验和静态条件下的拉伸试验，对处理后和未老化沥青的自愈性能进行了评估。此外，将PR的功效与商业回春剂进行了比较。结果表明，PR的高烯烃和芳烃含量（柠檬烯：32.9%，花香烃：20.65%）有利于沥青中麦芽酸组分的恢复，并增强了与处理后材料的化学相互作用。这些化合物还促进了对“蜜蜂状”结构的消化作用，导致更均匀的微观结构。在最佳条件下（6 wt. % PR用量和30°C），疲劳愈合指数达到30%，与原始沥青（31%）相当。在25°C下12 h的拉伸试验中，愈合指数与商业恢复剂相匹配。这些发现突出了热再生剂作为一种可持续和有效的解决方案的潜力，用于老化沥青的功能修复。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Fuel 工程技术-工程：化工

CiteScore

12.80

自引率

20.30%

发文量

3506

审稿时长

64 days

期刊介绍： The exploration of energy sources remains a critical matter of study. For the past nine decades, fuel has consistently held the forefront in primary research efforts within the field of energy science. This area of investigation encompasses a wide range of subjects, with a particular emphasis on emerging concerns like environmental factors and pollution.